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1 : : /*-------------------------------------------------------------------------
2 : : *
3 : : * dbcommands.c
4 : : * Database management commands (create/drop database).
5 : : *
6 : : * Note: database creation/destruction commands use exclusive locks on
7 : : * the database objects (as expressed by LockSharedObject()) to avoid
8 : : * stepping on each others' toes. Formerly we used table-level locks
9 : : * on pg_database, but that's too coarse-grained.
10 : : *
11 : : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
12 : : * Portions Copyright (c) 1994, Regents of the University of California
13 : : *
14 : : *
15 : : * IDENTIFICATION
16 : : * src/backend/commands/dbcommands.c
17 : : *
18 : : *-------------------------------------------------------------------------
19 : : */
20 : : #include "postgres.h"
21 : :
22 : : #include <fcntl.h>
23 : : #include <unistd.h>
24 : : #include <sys/stat.h>
25 : :
26 : : #include "access/genam.h"
27 : : #include "access/heapam.h"
28 : : #include "access/htup_details.h"
29 : : #include "access/multixact.h"
30 : : #include "access/tableam.h"
31 : : #include "access/xact.h"
32 : : #include "access/xloginsert.h"
33 : : #include "access/xlogrecovery.h"
34 : : #include "access/xlogutils.h"
35 : : #include "catalog/catalog.h"
36 : : #include "catalog/dependency.h"
37 : : #include "catalog/indexing.h"
38 : : #include "catalog/objectaccess.h"
39 : : #include "catalog/pg_authid.h"
40 : : #include "catalog/pg_collation.h"
41 : : #include "catalog/pg_database.h"
42 : : #include "catalog/pg_db_role_setting.h"
43 : : #include "catalog/pg_subscription.h"
44 : : #include "catalog/pg_tablespace.h"
45 : : #include "commands/comment.h"
46 : : #include "commands/dbcommands.h"
47 : : #include "commands/dbcommands_xlog.h"
48 : : #include "commands/defrem.h"
49 : : #include "commands/seclabel.h"
50 : : #include "commands/tablespace.h"
51 : : #include "common/file_perm.h"
52 : : #include "mb/pg_wchar.h"
53 : : #include "miscadmin.h"
54 : : #include "pgstat.h"
55 : : #include "postmaster/bgwriter.h"
56 : : #include "replication/slot.h"
57 : : #include "storage/copydir.h"
58 : : #include "storage/fd.h"
59 : : #include "storage/ipc.h"
60 : : #include "storage/lmgr.h"
61 : : #include "storage/md.h"
62 : : #include "storage/procarray.h"
63 : : #include "storage/smgr.h"
64 : : #include "utils/acl.h"
65 : : #include "utils/builtins.h"
66 : : #include "utils/fmgroids.h"
67 : : #include "utils/lsyscache.h"
68 : : #include "utils/pg_locale.h"
69 : : #include "utils/relmapper.h"
70 : : #include "utils/snapmgr.h"
71 : : #include "utils/syscache.h"
72 : :
73 : : /*
74 : : * Create database strategy.
75 : : *
76 : : * CREATEDB_WAL_LOG will copy the database at the block level and WAL log each
77 : : * copied block.
78 : : *
79 : : * CREATEDB_FILE_COPY will simply perform a file system level copy of the
80 : : * database and log a single record for each tablespace copied. To make this
81 : : * safe, it also triggers checkpoints before and after the operation.
82 : : */
83 : : typedef enum CreateDBStrategy
84 : : {
85 : : CREATEDB_WAL_LOG,
86 : : CREATEDB_FILE_COPY,
87 : : } CreateDBStrategy;
88 : :
89 : : typedef struct
90 : : {
91 : : Oid src_dboid; /* source (template) DB */
92 : : Oid dest_dboid; /* DB we are trying to create */
93 : : CreateDBStrategy strategy; /* create db strategy */
94 : : } createdb_failure_params;
95 : :
96 : : typedef struct
97 : : {
98 : : Oid dest_dboid; /* DB we are trying to move */
99 : : Oid dest_tsoid; /* tablespace we are trying to move to */
100 : : } movedb_failure_params;
101 : :
102 : : /*
103 : : * Information about a relation to be copied when creating a database.
104 : : */
105 : : typedef struct CreateDBRelInfo
106 : : {
107 : : RelFileLocator rlocator; /* physical relation identifier */
108 : : Oid reloid; /* relation oid */
109 : : bool permanent; /* relation is permanent or unlogged */
110 : : } CreateDBRelInfo;
111 : :
112 : :
113 : : /* non-export function prototypes */
114 : : static void createdb_failure_callback(int code, Datum arg);
115 : : static void movedb(const char *dbname, const char *tblspcname);
116 : : static void movedb_failure_callback(int code, Datum arg);
117 : : static bool get_db_info(const char *name, LOCKMODE lockmode,
118 : : Oid *dbIdP, Oid *ownerIdP,
119 : : int *encodingP, bool *dbIsTemplateP, bool *dbAllowConnP, bool *dbHasLoginEvtP,
120 : : TransactionId *dbFrozenXidP, MultiXactId *dbMinMultiP,
121 : : Oid *dbTablespace, char **dbCollate, char **dbCtype, char **dbLocale,
122 : : char **dbIcurules,
123 : : char *dbLocProvider,
124 : : char **dbCollversion);
125 : : static void remove_dbtablespaces(Oid db_id);
126 : : static bool check_db_file_conflict(Oid db_id);
127 : : static int errdetail_busy_db(int notherbackends, int npreparedxacts);
128 : : static void CreateDatabaseUsingWalLog(Oid src_dboid, Oid dst_dboid, Oid src_tsid,
129 : : Oid dst_tsid);
130 : : static List *ScanSourceDatabasePgClass(Oid tbid, Oid dbid, char *srcpath);
131 : : static List *ScanSourceDatabasePgClassPage(Page page, Buffer buf, Oid tbid,
132 : : Oid dbid, char *srcpath,
133 : : List *rlocatorlist, Snapshot snapshot);
134 : : static CreateDBRelInfo *ScanSourceDatabasePgClassTuple(HeapTupleData *tuple,
135 : : Oid tbid, Oid dbid,
136 : : char *srcpath);
137 : : static void CreateDirAndVersionFile(char *dbpath, Oid dbid, Oid tsid,
138 : : bool isRedo);
139 : : static void CreateDatabaseUsingFileCopy(Oid src_dboid, Oid dst_dboid,
140 : : Oid src_tsid, Oid dst_tsid);
141 : : static void recovery_create_dbdir(char *path, bool only_tblspc);
142 : :
143 : : /*
144 : : * Create a new database using the WAL_LOG strategy.
145 : : *
146 : : * Each copied block is separately written to the write-ahead log.
147 : : */
148 : : static void
149 : 3 : CreateDatabaseUsingWalLog(Oid src_dboid, Oid dst_dboid,
150 : : Oid src_tsid, Oid dst_tsid)
151 : : {
152 : 3 : char *srcpath;
153 : 3 : char *dstpath;
154 : 3 : List *rlocatorlist = NULL;
155 : 3 : ListCell *cell;
156 : 3 : LockRelId srcrelid;
157 : 3 : LockRelId dstrelid;
158 : 3 : RelFileLocator srcrlocator;
159 : 3 : RelFileLocator dstrlocator;
160 : 3 : CreateDBRelInfo *relinfo;
161 : :
162 : : /* Get source and destination database paths. */
163 : 3 : srcpath = GetDatabasePath(src_dboid, src_tsid);
164 : 3 : dstpath = GetDatabasePath(dst_dboid, dst_tsid);
165 : :
166 : : /* Create database directory and write PG_VERSION file. */
167 : 3 : CreateDirAndVersionFile(dstpath, dst_dboid, dst_tsid, false);
168 : :
169 : : /* Copy relmap file from source database to the destination database. */
170 : 3 : RelationMapCopy(dst_dboid, dst_tsid, srcpath, dstpath);
171 : :
172 : : /* Get list of relfilelocators to copy from the source database. */
173 : 3 : rlocatorlist = ScanSourceDatabasePgClass(src_tsid, src_dboid, srcpath);
174 [ + - ]: 3 : Assert(rlocatorlist != NIL);
175 : :
176 : : /*
177 : : * Database IDs will be the same for all relations so set them before
178 : : * entering the loop.
179 : : */
180 : 3 : srcrelid.dbId = src_dboid;
181 : 3 : dstrelid.dbId = dst_dboid;
182 : :
183 : : /* Loop over our list of relfilelocators and copy each one. */
184 [ + - + + : 675 : foreach(cell, rlocatorlist)
+ + ]
185 : : {
186 : 672 : relinfo = lfirst(cell);
187 : 672 : srcrlocator = relinfo->rlocator;
188 : :
189 : : /*
190 : : * If the relation is from the source db's default tablespace then we
191 : : * need to create it in the destination db's default tablespace.
192 : : * Otherwise, we need to create in the same tablespace as it is in the
193 : : * source database.
194 : : */
195 [ + - ]: 672 : if (srcrlocator.spcOid == src_tsid)
196 : 672 : dstrlocator.spcOid = dst_tsid;
197 : : else
198 : 0 : dstrlocator.spcOid = srcrlocator.spcOid;
199 : :
200 : 672 : dstrlocator.dbOid = dst_dboid;
201 : 672 : dstrlocator.relNumber = srcrlocator.relNumber;
202 : :
203 : : /*
204 : : * Acquire locks on source and target relations before copying.
205 : : *
206 : : * We typically do not read relation data into shared_buffers without
207 : : * holding a relation lock. It's unclear what could go wrong if we
208 : : * skipped it in this case, because nobody can be modifying either the
209 : : * source or destination database at this point, and we have locks on
210 : : * both databases, too, but let's take the conservative route.
211 : : */
212 : 672 : dstrelid.relId = srcrelid.relId = relinfo->reloid;
213 : 672 : LockRelationId(&srcrelid, AccessShareLock);
214 : 672 : LockRelationId(&dstrelid, AccessShareLock);
215 : :
216 : : /* Copy relation storage from source to the destination. */
217 : 672 : CreateAndCopyRelationData(srcrlocator, dstrlocator, relinfo->permanent);
218 : :
219 : : /* Release the relation locks. */
220 : 672 : UnlockRelationId(&srcrelid, AccessShareLock);
221 : 672 : UnlockRelationId(&dstrelid, AccessShareLock);
222 : 672 : }
223 : :
224 : 3 : pfree(srcpath);
225 : 3 : pfree(dstpath);
226 : 3 : list_free_deep(rlocatorlist);
227 : 3 : }
228 : :
229 : : /*
230 : : * Scan the pg_class table in the source database to identify the relations
231 : : * that need to be copied to the destination database.
232 : : *
233 : : * This is an exception to the usual rule that cross-database access is
234 : : * not possible. We can make it work here because we know that there are no
235 : : * connections to the source database and (since there can't be prepared
236 : : * transactions touching that database) no in-doubt tuples either. This
237 : : * means that we don't need to worry about pruning removing anything from
238 : : * under us, and we don't need to be too picky about our snapshot either.
239 : : * As long as it sees all previously-committed XIDs as committed and all
240 : : * aborted XIDs as aborted, we should be fine: nothing else is possible
241 : : * here.
242 : : *
243 : : * We can't rely on the relcache for anything here, because that only knows
244 : : * about the database to which we are connected, and can't handle access to
245 : : * other databases. That also means we can't rely on the heap scan
246 : : * infrastructure, which would be a bad idea anyway since it might try
247 : : * to do things like HOT pruning which we definitely can't do safely in
248 : : * a database to which we're not even connected.
249 : : */
250 : : static List *
251 : 3 : ScanSourceDatabasePgClass(Oid tbid, Oid dbid, char *srcpath)
252 : : {
253 : 3 : RelFileLocator rlocator;
254 : 3 : BlockNumber nblocks;
255 : 3 : BlockNumber blkno;
256 : 3 : Buffer buf;
257 : 3 : RelFileNumber relfilenumber;
258 : 3 : Page page;
259 : 3 : List *rlocatorlist = NIL;
260 : 3 : LockRelId relid;
261 : 3 : Snapshot snapshot;
262 : 3 : SMgrRelation smgr;
263 : 3 : BufferAccessStrategy bstrategy;
264 : :
265 : : /* Get pg_class relfilenumber. */
266 : 3 : relfilenumber = RelationMapOidToFilenumberForDatabase(srcpath,
267 : : RelationRelationId);
268 : :
269 : : /* Don't read data into shared_buffers without holding a relation lock. */
270 : 3 : relid.dbId = dbid;
271 : 3 : relid.relId = RelationRelationId;
272 : 3 : LockRelationId(&relid, AccessShareLock);
273 : :
274 : : /* Prepare a RelFileLocator for the pg_class relation. */
275 : 3 : rlocator.spcOid = tbid;
276 : 3 : rlocator.dbOid = dbid;
277 : 3 : rlocator.relNumber = relfilenumber;
278 : :
279 : 3 : smgr = smgropen(rlocator, INVALID_PROC_NUMBER);
280 : 3 : nblocks = smgrnblocks(smgr, MAIN_FORKNUM);
281 : 3 : smgrclose(smgr);
282 : :
283 : : /* Use a buffer access strategy since this is a bulk read operation. */
284 : 3 : bstrategy = GetAccessStrategy(BAS_BULKREAD);
285 : :
286 : : /*
287 : : * As explained in the function header comments, we need a snapshot that
288 : : * will see all committed transactions as committed, and our transaction
289 : : * snapshot - or the active snapshot - might not be new enough for that,
290 : : * but the return value of GetLatestSnapshot() should work fine.
291 : : */
292 : 3 : snapshot = RegisterSnapshot(GetLatestSnapshot());
293 : :
294 : : /* Process the relation block by block. */
295 [ + + ]: 45 : for (blkno = 0; blkno < nblocks; blkno++)
296 : : {
297 [ + - ]: 42 : CHECK_FOR_INTERRUPTS();
298 : :
299 : 84 : buf = ReadBufferWithoutRelcache(rlocator, MAIN_FORKNUM, blkno,
300 : 42 : RBM_NORMAL, bstrategy, true);
301 : :
302 : 42 : LockBuffer(buf, BUFFER_LOCK_SHARE);
303 : 42 : page = BufferGetPage(buf);
304 [ + - - + ]: 42 : if (PageIsNew(page) || PageIsEmpty(page))
305 : : {
306 : 0 : UnlockReleaseBuffer(buf);
307 : 0 : continue;
308 : : }
309 : :
310 : : /* Append relevant pg_class tuples for current page to rlocatorlist. */
311 : 84 : rlocatorlist = ScanSourceDatabasePgClassPage(page, buf, tbid, dbid,
312 : 42 : srcpath, rlocatorlist,
313 : 42 : snapshot);
314 : :
315 : 42 : UnlockReleaseBuffer(buf);
316 : 42 : }
317 : 3 : UnregisterSnapshot(snapshot);
318 : :
319 : : /* Release relation lock. */
320 : 3 : UnlockRelationId(&relid, AccessShareLock);
321 : :
322 : 6 : return rlocatorlist;
323 : 3 : }
324 : :
325 : : /*
326 : : * Scan one page of the source database's pg_class relation and add relevant
327 : : * entries to rlocatorlist. The return value is the updated list.
328 : : */
329 : : static List *
330 : 42 : ScanSourceDatabasePgClassPage(Page page, Buffer buf, Oid tbid, Oid dbid,
331 : : char *srcpath, List *rlocatorlist,
332 : : Snapshot snapshot)
333 : : {
334 : 42 : BlockNumber blkno = BufferGetBlockNumber(buf);
335 : 42 : OffsetNumber offnum;
336 : 42 : OffsetNumber maxoff;
337 : 42 : HeapTupleData tuple;
338 : :
339 : 42 : maxoff = PageGetMaxOffsetNumber(page);
340 : :
341 : : /* Loop over offsets. */
342 [ + + ]: 2163 : for (offnum = FirstOffsetNumber;
343 : 2163 : offnum <= maxoff;
344 : 2121 : offnum = OffsetNumberNext(offnum))
345 : : {
346 : 2121 : ItemId itemid;
347 : :
348 : 2121 : itemid = PageGetItemId(page, offnum);
349 : :
350 : : /* Nothing to do if slot is empty or already dead. */
351 [ + + + - : 2121 : if (!ItemIdIsUsed(itemid) || ItemIdIsDead(itemid) ||
+ + ]
352 : 1518 : ItemIdIsRedirected(itemid))
353 : 870 : continue;
354 : :
355 [ - + ]: 1251 : Assert(ItemIdIsNormal(itemid));
356 : 1251 : ItemPointerSet(&(tuple.t_self), blkno, offnum);
357 : :
358 : : /* Initialize a HeapTupleData structure. */
359 : 1251 : tuple.t_data = (HeapTupleHeader) PageGetItem(page, itemid);
360 : 1251 : tuple.t_len = ItemIdGetLength(itemid);
361 : 1251 : tuple.t_tableOid = RelationRelationId;
362 : :
363 : : /* Skip tuples that are not visible to this snapshot. */
364 [ - + ]: 1251 : if (HeapTupleSatisfiesVisibility(&tuple, snapshot, buf))
365 : : {
366 : 1251 : CreateDBRelInfo *relinfo;
367 : :
368 : : /*
369 : : * ScanSourceDatabasePgClassTuple is in charge of constructing a
370 : : * CreateDBRelInfo object for this tuple, but can also decide that
371 : : * this tuple isn't something we need to copy. If we do need to
372 : : * copy the relation, add it to the list.
373 : : */
374 : 2502 : relinfo = ScanSourceDatabasePgClassTuple(&tuple, tbid, dbid,
375 : 1251 : srcpath);
376 [ + + ]: 1251 : if (relinfo != NULL)
377 : 672 : rlocatorlist = lappend(rlocatorlist, relinfo);
378 : 1251 : }
379 [ - + + ]: 2121 : }
380 : :
381 : 84 : return rlocatorlist;
382 : 42 : }
383 : :
384 : : /*
385 : : * Decide whether a certain pg_class tuple represents something that
386 : : * needs to be copied from the source database to the destination database,
387 : : * and if so, construct a CreateDBRelInfo for it.
388 : : *
389 : : * Visibility checks are handled by the caller, so our job here is just
390 : : * to assess the data stored in the tuple.
391 : : */
392 : : CreateDBRelInfo *
393 : 1251 : ScanSourceDatabasePgClassTuple(HeapTupleData *tuple, Oid tbid, Oid dbid,
394 : : char *srcpath)
395 : : {
396 : 1251 : CreateDBRelInfo *relinfo;
397 : 1251 : Form_pg_class classForm;
398 : 1251 : RelFileNumber relfilenumber = InvalidRelFileNumber;
399 : :
400 : 1251 : classForm = (Form_pg_class) GETSTRUCT(tuple);
401 : :
402 : : /*
403 : : * Return NULL if this object does not need to be copied.
404 : : *
405 : : * Shared objects don't need to be copied, because they are shared.
406 : : * Objects without storage can't be copied, because there's nothing to
407 : : * copy. Temporary relations don't need to be copied either, because they
408 : : * are inaccessible outside of the session that created them, which must
409 : : * be gone already, and couldn't connect to a different database if it
410 : : * still existed. autovacuum will eventually remove the pg_class entries
411 : : * as well.
412 : : */
413 [ + + ]: 1251 : if (classForm->reltablespace == GLOBALTABLESPACE_OID ||
414 [ + + + + : 1113 : !RELKIND_HAS_STORAGE(classForm->relkind) ||
+ - + + +
+ ]
415 : 1113 : classForm->relpersistence == RELPERSISTENCE_TEMP)
416 : 579 : return NULL;
417 : :
418 : : /*
419 : : * If relfilenumber is valid then directly use it. Otherwise, consult the
420 : : * relmap.
421 : : */
422 [ + + ]: 672 : if (RelFileNumberIsValid(classForm->relfilenode))
423 : 621 : relfilenumber = classForm->relfilenode;
424 : : else
425 : 102 : relfilenumber = RelationMapOidToFilenumberForDatabase(srcpath,
426 : 51 : classForm->oid);
427 : :
428 : : /* We must have a valid relfilenumber. */
429 [ + - ]: 672 : if (!RelFileNumberIsValid(relfilenumber))
430 [ # # # # ]: 0 : elog(ERROR, "relation with OID %u does not have a valid relfilenumber",
431 : : classForm->oid);
432 : :
433 : : /* Prepare a rel info element and add it to the list. */
434 : 672 : relinfo = palloc_object(CreateDBRelInfo);
435 [ - + ]: 672 : if (OidIsValid(classForm->reltablespace))
436 : 0 : relinfo->rlocator.spcOid = classForm->reltablespace;
437 : : else
438 : 672 : relinfo->rlocator.spcOid = tbid;
439 : :
440 : 672 : relinfo->rlocator.dbOid = dbid;
441 : 672 : relinfo->rlocator.relNumber = relfilenumber;
442 : 672 : relinfo->reloid = classForm->oid;
443 : :
444 : : /* Temporary relations were rejected above. */
445 [ + - ]: 672 : Assert(classForm->relpersistence != RELPERSISTENCE_TEMP);
446 : 672 : relinfo->permanent =
447 : 672 : (classForm->relpersistence == RELPERSISTENCE_PERMANENT) ? true : false;
448 : :
449 : 672 : return relinfo;
450 : 1251 : }
451 : :
452 : : /*
453 : : * Create database directory and write out the PG_VERSION file in the database
454 : : * path. If isRedo is true, it's okay for the database directory to exist
455 : : * already.
456 : : */
457 : : static void
458 : 3 : CreateDirAndVersionFile(char *dbpath, Oid dbid, Oid tsid, bool isRedo)
459 : : {
460 : 3 : int fd;
461 : 3 : int nbytes;
462 : 3 : char versionfile[MAXPGPATH];
463 : 3 : char buf[16];
464 : :
465 : : /*
466 : : * Note that we don't have to copy version data from the source database;
467 : : * there's only one legal value.
468 : : */
469 : 3 : sprintf(buf, "%s\n", PG_MAJORVERSION);
470 : 3 : nbytes = strlen(PG_MAJORVERSION) + 1;
471 : :
472 : : /* Create database directory. */
473 [ + - ]: 3 : if (MakePGDirectory(dbpath) < 0)
474 : : {
475 : : /* Failure other than already exists or not in WAL replay? */
476 [ # # ]: 0 : if (errno != EEXIST || !isRedo)
477 [ # # # # ]: 0 : ereport(ERROR,
478 : : (errcode_for_file_access(),
479 : : errmsg("could not create directory \"%s\": %m", dbpath)));
480 : 0 : }
481 : :
482 : : /*
483 : : * Create PG_VERSION file in the database path. If the file already
484 : : * exists and we are in WAL replay then try again to open it in write
485 : : * mode.
486 : : */
487 : 3 : snprintf(versionfile, sizeof(versionfile), "%s/%s", dbpath, "PG_VERSION");
488 : :
489 : 3 : fd = OpenTransientFile(versionfile, O_WRONLY | O_CREAT | O_EXCL | PG_BINARY);
490 [ - + # # : 3 : if (fd < 0 && errno == EEXIST && isRedo)
# # ]
491 : 0 : fd = OpenTransientFile(versionfile, O_WRONLY | O_TRUNC | PG_BINARY);
492 : :
493 [ + - ]: 3 : if (fd < 0)
494 [ # # # # ]: 0 : ereport(ERROR,
495 : : (errcode_for_file_access(),
496 : : errmsg("could not create file \"%s\": %m", versionfile)));
497 : :
498 : : /* Write PG_MAJORVERSION in the PG_VERSION file. */
499 : 3 : pgstat_report_wait_start(WAIT_EVENT_VERSION_FILE_WRITE);
500 : 3 : errno = 0;
501 [ + - ]: 3 : if ((int) write(fd, buf, nbytes) != nbytes)
502 : : {
503 : : /* If write didn't set errno, assume problem is no disk space. */
504 [ # # ]: 0 : if (errno == 0)
505 : 0 : errno = ENOSPC;
506 [ # # # # ]: 0 : ereport(ERROR,
507 : : (errcode_for_file_access(),
508 : : errmsg("could not write to file \"%s\": %m", versionfile)));
509 : 0 : }
510 : 3 : pgstat_report_wait_end();
511 : :
512 : 3 : pgstat_report_wait_start(WAIT_EVENT_VERSION_FILE_SYNC);
513 [ + - ]: 3 : if (pg_fsync(fd) != 0)
514 [ # # # # : 0 : ereport(data_sync_elevel(ERROR),
# # ]
515 : : (errcode_for_file_access(),
516 : : errmsg("could not fsync file \"%s\": %m", versionfile)));
517 : 3 : fsync_fname(dbpath, true);
518 : 3 : pgstat_report_wait_end();
519 : :
520 : : /* Close the version file. */
521 : 3 : CloseTransientFile(fd);
522 : :
523 : : /* If we are not in WAL replay then write the WAL. */
524 [ - + ]: 3 : if (!isRedo)
525 : : {
526 : 3 : xl_dbase_create_wal_log_rec xlrec;
527 : :
528 : 3 : START_CRIT_SECTION();
529 : :
530 : 3 : xlrec.db_id = dbid;
531 : 3 : xlrec.tablespace_id = tsid;
532 : :
533 : 3 : XLogBeginInsert();
534 : 3 : XLogRegisterData(&xlrec,
535 : : sizeof(xl_dbase_create_wal_log_rec));
536 : :
537 : 3 : (void) XLogInsert(RM_DBASE_ID, XLOG_DBASE_CREATE_WAL_LOG);
538 : :
539 [ + - ]: 3 : END_CRIT_SECTION();
540 : 3 : }
541 : 3 : }
542 : :
543 : : /*
544 : : * Create a new database using the FILE_COPY strategy.
545 : : *
546 : : * Copy each tablespace at the filesystem level, and log a single WAL record
547 : : * for each tablespace copied. This requires a checkpoint before and after the
548 : : * copy, which may be expensive, but it does greatly reduce WAL generation
549 : : * if the copied database is large.
550 : : */
551 : : static void
552 : 2 : CreateDatabaseUsingFileCopy(Oid src_dboid, Oid dst_dboid, Oid src_tsid,
553 : : Oid dst_tsid)
554 : : {
555 : 2 : TableScanDesc scan;
556 : 2 : Relation rel;
557 : 2 : HeapTuple tuple;
558 : :
559 : : /*
560 : : * Force a checkpoint before starting the copy. This will force all dirty
561 : : * buffers, including those of unlogged tables, out to disk, to ensure
562 : : * source database is up-to-date on disk for the copy.
563 : : * FlushDatabaseBuffers() would suffice for that, but we also want to
564 : : * process any pending unlink requests. Otherwise, if a checkpoint
565 : : * happened while we're copying files, a file might be deleted just when
566 : : * we're about to copy it, causing the lstat() call in copydir() to fail
567 : : * with ENOENT.
568 : : *
569 : : * In binary upgrade mode, we can skip this checkpoint because pg_upgrade
570 : : * is careful to ensure that template0 is fully written to disk prior to
571 : : * any CREATE DATABASE commands.
572 : : */
573 [ - + ]: 2 : if (!IsBinaryUpgrade)
574 : 2 : RequestCheckpoint(CHECKPOINT_FAST | CHECKPOINT_FORCE |
575 : : CHECKPOINT_WAIT | CHECKPOINT_FLUSH_UNLOGGED);
576 : :
577 : : /*
578 : : * Iterate through all tablespaces of the template database, and copy each
579 : : * one to the new database.
580 : : */
581 : 2 : rel = table_open(TableSpaceRelationId, AccessShareLock);
582 : 2 : scan = table_beginscan_catalog(rel, 0, NULL);
583 [ + + ]: 6 : while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
584 : : {
585 : 4 : Form_pg_tablespace spaceform = (Form_pg_tablespace) GETSTRUCT(tuple);
586 : 4 : Oid srctablespace = spaceform->oid;
587 : 4 : Oid dsttablespace;
588 : 4 : char *srcpath;
589 : 4 : char *dstpath;
590 : 4 : struct stat st;
591 : :
592 : : /* No need to copy global tablespace */
593 [ + + ]: 4 : if (srctablespace == GLOBALTABLESPACE_OID)
594 : 2 : continue;
595 : :
596 : 2 : srcpath = GetDatabasePath(src_dboid, srctablespace);
597 : :
598 [ + - + - : 2 : if (stat(srcpath, &st) < 0 || !S_ISDIR(st.st_mode) ||
- + ]
599 : 2 : directory_is_empty(srcpath))
600 : : {
601 : : /* Assume we can ignore it */
602 : 0 : pfree(srcpath);
603 : 0 : continue;
604 : : }
605 : :
606 [ + - ]: 2 : if (srctablespace == src_tsid)
607 : 2 : dsttablespace = dst_tsid;
608 : : else
609 : 0 : dsttablespace = srctablespace;
610 : :
611 : 2 : dstpath = GetDatabasePath(dst_dboid, dsttablespace);
612 : :
613 : : /*
614 : : * Copy this subdirectory to the new location
615 : : *
616 : : * We don't need to copy subdirectories
617 : : */
618 : 2 : copydir(srcpath, dstpath, false);
619 : :
620 : : /* Record the filesystem change in XLOG */
621 : : {
622 : 2 : xl_dbase_create_file_copy_rec xlrec;
623 : :
624 : 2 : xlrec.db_id = dst_dboid;
625 : 2 : xlrec.tablespace_id = dsttablespace;
626 : 2 : xlrec.src_db_id = src_dboid;
627 : 2 : xlrec.src_tablespace_id = srctablespace;
628 : :
629 : 2 : XLogBeginInsert();
630 : 2 : XLogRegisterData(&xlrec,
631 : : sizeof(xl_dbase_create_file_copy_rec));
632 : :
633 : 2 : (void) XLogInsert(RM_DBASE_ID,
634 : : XLOG_DBASE_CREATE_FILE_COPY | XLR_SPECIAL_REL_UPDATE);
635 : 2 : }
636 : 2 : pfree(srcpath);
637 : 2 : pfree(dstpath);
638 [ - + + ]: 4 : }
639 : 2 : table_endscan(scan);
640 : 2 : table_close(rel, AccessShareLock);
641 : :
642 : : /*
643 : : * We force a checkpoint before committing. This effectively means that
644 : : * committed XLOG_DBASE_CREATE_FILE_COPY operations will never need to be
645 : : * replayed (at least not in ordinary crash recovery; we still have to
646 : : * make the XLOG entry for the benefit of PITR operations). This avoids
647 : : * two nasty scenarios:
648 : : *
649 : : * #1: At wal_level=minimal, we don't XLOG the contents of newly created
650 : : * relfilenodes; therefore the drop-and-recreate-whole-directory behavior
651 : : * of DBASE_CREATE replay would lose such files created in the new
652 : : * database between our commit and the next checkpoint.
653 : : *
654 : : * #2: Since we have to recopy the source database during DBASE_CREATE
655 : : * replay, we run the risk of copying changes in it that were committed
656 : : * after the original CREATE DATABASE command but before the system crash
657 : : * that led to the replay. This is at least unexpected and at worst could
658 : : * lead to inconsistencies, eg duplicate table names.
659 : : *
660 : : * (Both of these were real bugs in releases 8.0 through 8.0.3.)
661 : : *
662 : : * In PITR replay, the first of these isn't an issue, and the second is
663 : : * only a risk if the CREATE DATABASE and subsequent template database
664 : : * change both occur while a base backup is being taken. There doesn't
665 : : * seem to be much we can do about that except document it as a
666 : : * limitation.
667 : : *
668 : : * In binary upgrade mode, we can skip this checkpoint because neither of
669 : : * these problems applies: we don't ever replay the WAL generated during
670 : : * pg_upgrade, and we don't support taking base backups during pg_upgrade
671 : : * (not to mention that we don't concurrently modify template0, either).
672 : : *
673 : : * See CreateDatabaseUsingWalLog() for a less cheesy CREATE DATABASE
674 : : * strategy that avoids these problems.
675 : : */
676 [ - + ]: 2 : if (!IsBinaryUpgrade)
677 : 2 : RequestCheckpoint(CHECKPOINT_FAST | CHECKPOINT_FORCE |
678 : : CHECKPOINT_WAIT);
679 : 2 : }
680 : :
681 : : /*
682 : : * CREATE DATABASE
683 : : */
684 : : Oid
685 : 6 : createdb(ParseState *pstate, const CreatedbStmt *stmt)
686 : : {
687 : 6 : Oid src_dboid;
688 : 6 : Oid src_owner;
689 : 6 : int src_encoding = -1;
690 : 6 : char *src_collate = NULL;
691 : 6 : char *src_ctype = NULL;
692 : 6 : char *src_locale = NULL;
693 : 6 : char *src_icurules = NULL;
694 : 6 : char src_locprovider = '\0';
695 : 6 : char *src_collversion = NULL;
696 : 6 : bool src_istemplate;
697 : 6 : bool src_hasloginevt = false;
698 : 6 : bool src_allowconn;
699 : 6 : TransactionId src_frozenxid = InvalidTransactionId;
700 : 6 : MultiXactId src_minmxid = InvalidMultiXactId;
701 : 6 : Oid src_deftablespace;
702 : 6 : volatile Oid dst_deftablespace;
703 : 6 : Relation pg_database_rel;
704 : 6 : HeapTuple tuple;
705 : 6 : Datum new_record[Natts_pg_database] = {0};
706 : 6 : bool new_record_nulls[Natts_pg_database] = {0};
707 : 6 : Oid dboid = InvalidOid;
708 : 6 : Oid datdba;
709 : 6 : ListCell *option;
710 : 6 : DefElem *tablespacenameEl = NULL;
711 : 6 : DefElem *ownerEl = NULL;
712 : 6 : DefElem *templateEl = NULL;
713 : 6 : DefElem *encodingEl = NULL;
714 : 6 : DefElem *localeEl = NULL;
715 : 6 : DefElem *builtinlocaleEl = NULL;
716 : 6 : DefElem *collateEl = NULL;
717 : 6 : DefElem *ctypeEl = NULL;
718 : 6 : DefElem *iculocaleEl = NULL;
719 : 6 : DefElem *icurulesEl = NULL;
720 : 6 : DefElem *locproviderEl = NULL;
721 : 6 : DefElem *istemplateEl = NULL;
722 : 6 : DefElem *allowconnectionsEl = NULL;
723 : 6 : DefElem *connlimitEl = NULL;
724 : 6 : DefElem *collversionEl = NULL;
725 : 6 : DefElem *strategyEl = NULL;
726 : 6 : char *dbname = stmt->dbname;
727 : 6 : char *dbowner = NULL;
728 : 6 : const char *dbtemplate = NULL;
729 : 6 : char *dbcollate = NULL;
730 : 6 : char *dbctype = NULL;
731 : 6 : const char *dblocale = NULL;
732 : 6 : char *dbicurules = NULL;
733 : 6 : char dblocprovider = '\0';
734 : 6 : char *canonname;
735 : 6 : int encoding = -1;
736 : 6 : bool dbistemplate = false;
737 : 6 : bool dballowconnections = true;
738 : 6 : int dbconnlimit = DATCONNLIMIT_UNLIMITED;
739 : 6 : char *dbcollversion = NULL;
740 : 6 : int notherbackends;
741 : 6 : int npreparedxacts;
742 : 6 : CreateDBStrategy dbstrategy = CREATEDB_WAL_LOG;
743 : 6 : createdb_failure_params fparms;
744 : :
745 : : /* Extract options from the statement node tree */
746 [ + + + + : 18 : foreach(option, stmt->options)
+ + ]
747 : : {
748 : 12 : DefElem *defel = (DefElem *) lfirst(option);
749 : :
750 [ + - ]: 12 : if (strcmp(defel->defname, "tablespace") == 0)
751 : : {
752 [ # # ]: 0 : if (tablespacenameEl)
753 : 0 : errorConflictingDefElem(defel, pstate);
754 : 0 : tablespacenameEl = defel;
755 : 0 : }
756 [ + - ]: 12 : else if (strcmp(defel->defname, "owner") == 0)
757 : : {
758 [ # # ]: 0 : if (ownerEl)
759 : 0 : errorConflictingDefElem(defel, pstate);
760 : 0 : ownerEl = defel;
761 : 0 : }
762 [ + + ]: 12 : else if (strcmp(defel->defname, "template") == 0)
763 : : {
764 [ + - ]: 3 : if (templateEl)
765 : 0 : errorConflictingDefElem(defel, pstate);
766 : 3 : templateEl = defel;
767 : 3 : }
768 [ + + ]: 9 : else if (strcmp(defel->defname, "encoding") == 0)
769 : : {
770 [ + - ]: 1 : if (encodingEl)
771 : 0 : errorConflictingDefElem(defel, pstate);
772 : 1 : encodingEl = defel;
773 : 1 : }
774 [ + - ]: 8 : else if (strcmp(defel->defname, "locale") == 0)
775 : : {
776 [ # # ]: 0 : if (localeEl)
777 : 0 : errorConflictingDefElem(defel, pstate);
778 : 0 : localeEl = defel;
779 : 0 : }
780 [ + - ]: 8 : else if (strcmp(defel->defname, "builtin_locale") == 0)
781 : : {
782 [ # # ]: 0 : if (builtinlocaleEl)
783 : 0 : errorConflictingDefElem(defel, pstate);
784 : 0 : builtinlocaleEl = defel;
785 : 0 : }
786 [ + + ]: 8 : else if (strcmp(defel->defname, "lc_collate") == 0)
787 : : {
788 [ - + ]: 1 : if (collateEl)
789 : 0 : errorConflictingDefElem(defel, pstate);
790 : 1 : collateEl = defel;
791 : 1 : }
792 [ + + ]: 7 : else if (strcmp(defel->defname, "lc_ctype") == 0)
793 : : {
794 [ + - ]: 1 : if (ctypeEl)
795 : 0 : errorConflictingDefElem(defel, pstate);
796 : 1 : ctypeEl = defel;
797 : 1 : }
798 [ + - ]: 6 : else if (strcmp(defel->defname, "icu_locale") == 0)
799 : : {
800 [ # # ]: 0 : if (iculocaleEl)
801 : 0 : errorConflictingDefElem(defel, pstate);
802 : 0 : iculocaleEl = defel;
803 : 0 : }
804 [ + - ]: 6 : else if (strcmp(defel->defname, "icu_rules") == 0)
805 : : {
806 [ # # ]: 0 : if (icurulesEl)
807 : 0 : errorConflictingDefElem(defel, pstate);
808 : 0 : icurulesEl = defel;
809 : 0 : }
810 [ + - ]: 6 : else if (strcmp(defel->defname, "locale_provider") == 0)
811 : : {
812 [ # # ]: 0 : if (locproviderEl)
813 : 0 : errorConflictingDefElem(defel, pstate);
814 : 0 : locproviderEl = defel;
815 : 0 : }
816 [ + + ]: 6 : else if (strcmp(defel->defname, "is_template") == 0)
817 : : {
818 [ - + ]: 1 : if (istemplateEl)
819 : 0 : errorConflictingDefElem(defel, pstate);
820 : 1 : istemplateEl = defel;
821 : 1 : }
822 [ + + ]: 5 : else if (strcmp(defel->defname, "allow_connections") == 0)
823 : : {
824 [ + - ]: 1 : if (allowconnectionsEl)
825 : 0 : errorConflictingDefElem(defel, pstate);
826 : 1 : allowconnectionsEl = defel;
827 : 1 : }
828 [ + - ]: 4 : else if (strcmp(defel->defname, "connection_limit") == 0)
829 : : {
830 [ # # ]: 0 : if (connlimitEl)
831 : 0 : errorConflictingDefElem(defel, pstate);
832 : 0 : connlimitEl = defel;
833 : 0 : }
834 [ + - ]: 4 : else if (strcmp(defel->defname, "collation_version") == 0)
835 : : {
836 [ # # ]: 0 : if (collversionEl)
837 : 0 : errorConflictingDefElem(defel, pstate);
838 : 0 : collversionEl = defel;
839 : 0 : }
840 [ + - ]: 4 : else if (strcmp(defel->defname, "location") == 0)
841 : : {
842 [ # # # # ]: 0 : ereport(WARNING,
843 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
844 : : errmsg("LOCATION is not supported anymore"),
845 : : errhint("Consider using tablespaces instead."),
846 : : parser_errposition(pstate, defel->location)));
847 : 0 : }
848 [ + + ]: 4 : else if (strcmp(defel->defname, "oid") == 0)
849 : : {
850 : 2 : dboid = defGetObjectId(defel);
851 : :
852 : : /*
853 : : * We don't normally permit new databases to be created with
854 : : * system-assigned OIDs. pg_upgrade tries to preserve database
855 : : * OIDs, so we can't allow any database to be created with an OID
856 : : * that might be in use in a freshly-initialized cluster created
857 : : * by some future version. We assume all such OIDs will be from
858 : : * the system-managed OID range.
859 : : *
860 : : * As an exception, however, we permit any OID to be assigned when
861 : : * allow_system_table_mods=on (so that initdb can assign system
862 : : * OIDs to template0 and postgres) or when performing a binary
863 : : * upgrade (so that pg_upgrade can preserve whatever OIDs it finds
864 : : * in the source cluster).
865 : : */
866 [ + - ]: 2 : if (dboid < FirstNormalObjectId &&
867 [ - + # # ]: 2 : !allowSystemTableMods && !IsBinaryUpgrade)
868 [ # # # # ]: 0 : ereport(ERROR,
869 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE)),
870 : : errmsg("OIDs less than %u are reserved for system objects", FirstNormalObjectId));
871 : 2 : }
872 [ - + ]: 2 : else if (strcmp(defel->defname, "strategy") == 0)
873 : : {
874 [ - + ]: 2 : if (strategyEl)
875 : 0 : errorConflictingDefElem(defel, pstate);
876 : 2 : strategyEl = defel;
877 : 2 : }
878 : : else
879 [ # # # # ]: 0 : ereport(ERROR,
880 : : (errcode(ERRCODE_SYNTAX_ERROR),
881 : : errmsg("option \"%s\" not recognized", defel->defname),
882 : : parser_errposition(pstate, defel->location)));
883 : 12 : }
884 : :
885 [ - + # # ]: 6 : if (ownerEl && ownerEl->arg)
886 : 0 : dbowner = defGetString(ownerEl);
887 [ + + + - ]: 6 : if (templateEl && templateEl->arg)
888 : 3 : dbtemplate = defGetString(templateEl);
889 [ + + - + ]: 6 : if (encodingEl && encodingEl->arg)
890 : : {
891 : 1 : const char *encoding_name;
892 : :
893 [ - + ]: 1 : if (IsA(encodingEl->arg, Integer))
894 : : {
895 : 0 : encoding = defGetInt32(encodingEl);
896 : 0 : encoding_name = pg_encoding_to_char(encoding);
897 [ # # ]: 0 : if (strcmp(encoding_name, "") == 0 ||
898 : 0 : pg_valid_server_encoding(encoding_name) < 0)
899 [ # # # # ]: 0 : ereport(ERROR,
900 : : (errcode(ERRCODE_UNDEFINED_OBJECT),
901 : : errmsg("%d is not a valid encoding code",
902 : : encoding),
903 : : parser_errposition(pstate, encodingEl->location)));
904 : 0 : }
905 : : else
906 : : {
907 : 1 : encoding_name = defGetString(encodingEl);
908 : 1 : encoding = pg_valid_server_encoding(encoding_name);
909 [ + - ]: 1 : if (encoding < 0)
910 [ # # # # ]: 0 : ereport(ERROR,
911 : : (errcode(ERRCODE_UNDEFINED_OBJECT),
912 : : errmsg("%s is not a valid encoding name",
913 : : encoding_name),
914 : : parser_errposition(pstate, encodingEl->location)));
915 : : }
916 : 1 : }
917 [ - + # # ]: 6 : if (localeEl && localeEl->arg)
918 : : {
919 : 0 : dbcollate = defGetString(localeEl);
920 : 0 : dbctype = defGetString(localeEl);
921 : 0 : dblocale = defGetString(localeEl);
922 : 0 : }
923 [ - + # # ]: 6 : if (builtinlocaleEl && builtinlocaleEl->arg)
924 : 0 : dblocale = defGetString(builtinlocaleEl);
925 [ + + - + ]: 6 : if (collateEl && collateEl->arg)
926 : 1 : dbcollate = defGetString(collateEl);
927 [ + + - + ]: 6 : if (ctypeEl && ctypeEl->arg)
928 : 1 : dbctype = defGetString(ctypeEl);
929 [ - + # # ]: 6 : if (iculocaleEl && iculocaleEl->arg)
930 : 0 : dblocale = defGetString(iculocaleEl);
931 [ - + # # ]: 6 : if (icurulesEl && icurulesEl->arg)
932 : 0 : dbicurules = defGetString(icurulesEl);
933 [ - + # # ]: 6 : if (locproviderEl && locproviderEl->arg)
934 : : {
935 : 0 : char *locproviderstr = defGetString(locproviderEl);
936 : :
937 [ # # ]: 0 : if (pg_strcasecmp(locproviderstr, "builtin") == 0)
938 : 0 : dblocprovider = COLLPROVIDER_BUILTIN;
939 [ # # ]: 0 : else if (pg_strcasecmp(locproviderstr, "icu") == 0)
940 : 0 : dblocprovider = COLLPROVIDER_ICU;
941 [ # # ]: 0 : else if (pg_strcasecmp(locproviderstr, "libc") == 0)
942 : 0 : dblocprovider = COLLPROVIDER_LIBC;
943 : : else
944 [ # # # # ]: 0 : ereport(ERROR,
945 : : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
946 : : errmsg("unrecognized locale provider: %s",
947 : : locproviderstr)));
948 : 0 : }
949 [ + + - + ]: 6 : if (istemplateEl && istemplateEl->arg)
950 : 1 : dbistemplate = defGetBoolean(istemplateEl);
951 [ + + - + ]: 6 : if (allowconnectionsEl && allowconnectionsEl->arg)
952 : 1 : dballowconnections = defGetBoolean(allowconnectionsEl);
953 [ - + # # ]: 6 : if (connlimitEl && connlimitEl->arg)
954 : : {
955 : 0 : dbconnlimit = defGetInt32(connlimitEl);
956 [ # # ]: 0 : if (dbconnlimit < DATCONNLIMIT_UNLIMITED)
957 [ # # # # ]: 0 : ereport(ERROR,
958 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
959 : : errmsg("invalid connection limit: %d", dbconnlimit)));
960 : 0 : }
961 [ + - ]: 6 : if (collversionEl)
962 : 0 : dbcollversion = defGetString(collversionEl);
963 : :
964 : : /* obtain OID of proposed owner */
965 [ - + ]: 6 : if (dbowner)
966 : 0 : datdba = get_role_oid(dbowner, false);
967 : : else
968 : 6 : datdba = GetUserId();
969 : :
970 : : /*
971 : : * To create a database, must have createdb privilege and must be able to
972 : : * become the target role (this does not imply that the target role itself
973 : : * must have createdb privilege). The latter provision guards against
974 : : * "giveaway" attacks. Note that a superuser will always have both of
975 : : * these privileges a fortiori.
976 : : */
977 [ + + ]: 6 : if (!have_createdb_privilege())
978 [ + - + - ]: 1 : ereport(ERROR,
979 : : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
980 : : errmsg("permission denied to create database")));
981 : :
982 : 5 : check_can_set_role(GetUserId(), datdba);
983 : :
984 : : /*
985 : : * Lookup database (template) to be cloned, and obtain share lock on it.
986 : : * ShareLock allows two CREATE DATABASEs to work from the same template
987 : : * concurrently, while ensuring no one is busy dropping it in parallel
988 : : * (which would be Very Bad since we'd likely get an incomplete copy
989 : : * without knowing it). This also prevents any new connections from being
990 : : * made to the source until we finish copying it, so we can be sure it
991 : : * won't change underneath us.
992 : : */
993 [ + + ]: 5 : if (!dbtemplate)
994 : 2 : dbtemplate = "template1"; /* Default template database name */
995 : :
996 [ + - ]: 5 : if (!get_db_info(dbtemplate, ShareLock,
997 : : &src_dboid, &src_owner, &src_encoding,
998 : : &src_istemplate, &src_allowconn, &src_hasloginevt,
999 : : &src_frozenxid, &src_minmxid, &src_deftablespace,
1000 : : &src_collate, &src_ctype, &src_locale, &src_icurules, &src_locprovider,
1001 : : &src_collversion))
1002 [ # # # # ]: 0 : ereport(ERROR,
1003 : : (errcode(ERRCODE_UNDEFINED_DATABASE),
1004 : : errmsg("template database \"%s\" does not exist",
1005 : : dbtemplate)));
1006 : :
1007 : : /*
1008 : : * If the source database was in the process of being dropped, we can't
1009 : : * use it as a template.
1010 : : */
1011 [ + - ]: 5 : if (database_is_invalid_oid(src_dboid))
1012 [ # # # # ]: 0 : ereport(ERROR,
1013 : : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1014 : : errmsg("cannot use invalid database \"%s\" as template", dbtemplate),
1015 : : errhint("Use DROP DATABASE to drop invalid databases."));
1016 : :
1017 : : /*
1018 : : * Permission check: to copy a DB that's not marked datistemplate, you
1019 : : * must be superuser or the owner thereof.
1020 : : */
1021 [ + - ]: 5 : if (!src_istemplate)
1022 : : {
1023 [ # # ]: 0 : if (!object_ownercheck(DatabaseRelationId, src_dboid, GetUserId()))
1024 [ # # # # ]: 0 : ereport(ERROR,
1025 : : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1026 : : errmsg("permission denied to copy database \"%s\"",
1027 : : dbtemplate)));
1028 : 0 : }
1029 : :
1030 : : /* Validate the database creation strategy. */
1031 [ + + - + ]: 5 : if (strategyEl && strategyEl->arg)
1032 : : {
1033 : 2 : char *strategy;
1034 : :
1035 : 2 : strategy = defGetString(strategyEl);
1036 [ - + ]: 2 : if (pg_strcasecmp(strategy, "wal_log") == 0)
1037 : 0 : dbstrategy = CREATEDB_WAL_LOG;
1038 [ + - ]: 2 : else if (pg_strcasecmp(strategy, "file_copy") == 0)
1039 : 2 : dbstrategy = CREATEDB_FILE_COPY;
1040 : : else
1041 [ # # # # ]: 0 : ereport(ERROR,
1042 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1043 : : errmsg("invalid create database strategy \"%s\"", strategy),
1044 : : errhint("Valid strategies are \"wal_log\" and \"file_copy\".")));
1045 : 2 : }
1046 : :
1047 : : /* If encoding or locales are defaulted, use source's setting */
1048 [ + + ]: 5 : if (encoding < 0)
1049 : 4 : encoding = src_encoding;
1050 [ + + ]: 5 : if (dbcollate == NULL)
1051 : 4 : dbcollate = src_collate;
1052 [ + + ]: 5 : if (dbctype == NULL)
1053 : 4 : dbctype = src_ctype;
1054 [ - + ]: 5 : if (dblocprovider == '\0')
1055 : 5 : dblocprovider = src_locprovider;
1056 [ + - - + ]: 5 : if (dblocale == NULL && dblocprovider == src_locprovider)
1057 : 5 : dblocale = src_locale;
1058 [ - + ]: 5 : if (dbicurules == NULL)
1059 : 5 : dbicurules = src_icurules;
1060 : :
1061 : : /* Some encodings are client only */
1062 [ + - ]: 5 : if (!PG_VALID_BE_ENCODING(encoding))
1063 [ # # # # ]: 0 : ereport(ERROR,
1064 : : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1065 : : errmsg("invalid server encoding %d", encoding)));
1066 : :
1067 : : /* Check that the chosen locales are valid, and get canonical spellings */
1068 [ + - ]: 5 : if (!check_locale(LC_COLLATE, dbcollate, &canonname))
1069 : : {
1070 [ # # ]: 0 : if (dblocprovider == COLLPROVIDER_BUILTIN)
1071 [ # # # # ]: 0 : ereport(ERROR,
1072 : : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1073 : : errmsg("invalid LC_COLLATE locale name: \"%s\"", dbcollate),
1074 : : errhint("If the locale name is specific to the builtin provider, use BUILTIN_LOCALE.")));
1075 [ # # ]: 0 : else if (dblocprovider == COLLPROVIDER_ICU)
1076 [ # # # # ]: 0 : ereport(ERROR,
1077 : : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1078 : : errmsg("invalid LC_COLLATE locale name: \"%s\"", dbcollate),
1079 : : errhint("If the locale name is specific to the ICU provider, use ICU_LOCALE.")));
1080 : : else
1081 [ # # # # ]: 0 : ereport(ERROR,
1082 : : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1083 : : errmsg("invalid LC_COLLATE locale name: \"%s\"", dbcollate)));
1084 : 0 : }
1085 : 5 : dbcollate = canonname;
1086 [ + - ]: 5 : if (!check_locale(LC_CTYPE, dbctype, &canonname))
1087 : : {
1088 [ # # ]: 0 : if (dblocprovider == COLLPROVIDER_BUILTIN)
1089 [ # # # # ]: 0 : ereport(ERROR,
1090 : : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1091 : : errmsg("invalid LC_CTYPE locale name: \"%s\"", dbctype),
1092 : : errhint("If the locale name is specific to the builtin provider, use BUILTIN_LOCALE.")));
1093 [ # # ]: 0 : else if (dblocprovider == COLLPROVIDER_ICU)
1094 [ # # # # ]: 0 : ereport(ERROR,
1095 : : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1096 : : errmsg("invalid LC_CTYPE locale name: \"%s\"", dbctype),
1097 : : errhint("If the locale name is specific to the ICU provider, use ICU_LOCALE.")));
1098 : : else
1099 [ # # # # ]: 0 : ereport(ERROR,
1100 : : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1101 : : errmsg("invalid LC_CTYPE locale name: \"%s\"", dbctype)));
1102 : 0 : }
1103 : :
1104 : 5 : dbctype = canonname;
1105 : :
1106 : 5 : check_encoding_locale_matches(encoding, dbcollate, dbctype);
1107 : :
1108 : : /* validate provider-specific parameters */
1109 [ - + ]: 5 : if (dblocprovider != COLLPROVIDER_BUILTIN)
1110 : : {
1111 [ + - ]: 5 : if (builtinlocaleEl)
1112 [ # # # # ]: 0 : ereport(ERROR,
1113 : : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1114 : : errmsg("BUILTIN_LOCALE cannot be specified unless locale provider is builtin")));
1115 : 5 : }
1116 : :
1117 [ - + ]: 5 : if (dblocprovider != COLLPROVIDER_ICU)
1118 : : {
1119 [ + - ]: 5 : if (iculocaleEl)
1120 [ # # # # ]: 0 : ereport(ERROR,
1121 : : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1122 : : errmsg("ICU locale cannot be specified unless locale provider is ICU")));
1123 : :
1124 [ + - ]: 5 : if (dbicurules)
1125 [ # # # # ]: 0 : ereport(ERROR,
1126 : : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1127 : : errmsg("ICU rules cannot be specified unless locale provider is ICU")));
1128 : 5 : }
1129 : :
1130 : : /* validate and canonicalize locale for the provider */
1131 [ - + ]: 5 : if (dblocprovider == COLLPROVIDER_BUILTIN)
1132 : : {
1133 : : /*
1134 : : * This would happen if template0 uses the libc provider but the new
1135 : : * database uses builtin.
1136 : : */
1137 [ # # ]: 0 : if (!dblocale)
1138 [ # # # # ]: 0 : ereport(ERROR,
1139 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1140 : : errmsg("LOCALE or BUILTIN_LOCALE must be specified")));
1141 : :
1142 : 0 : dblocale = builtin_validate_locale(encoding, dblocale);
1143 : 0 : }
1144 [ + - ]: 5 : else if (dblocprovider == COLLPROVIDER_ICU)
1145 : : {
1146 [ # # ]: 0 : if (!(is_encoding_supported_by_icu(encoding)))
1147 [ # # # # ]: 0 : ereport(ERROR,
1148 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1149 : : errmsg("encoding \"%s\" is not supported with ICU provider",
1150 : : pg_encoding_to_char(encoding))));
1151 : :
1152 : : /*
1153 : : * This would happen if template0 uses the libc provider but the new
1154 : : * database uses icu.
1155 : : */
1156 [ # # ]: 0 : if (!dblocale)
1157 [ # # # # ]: 0 : ereport(ERROR,
1158 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1159 : : errmsg("LOCALE or ICU_LOCALE must be specified")));
1160 : :
1161 : : /*
1162 : : * During binary upgrade, or when the locale came from the template
1163 : : * database, preserve locale string. Otherwise, canonicalize to a
1164 : : * language tag.
1165 : : */
1166 [ # # # # ]: 0 : if (!IsBinaryUpgrade && dblocale != src_locale)
1167 : : {
1168 : 0 : char *langtag = icu_language_tag(dblocale,
1169 : 0 : icu_validation_level);
1170 : :
1171 [ # # # # ]: 0 : if (langtag && strcmp(dblocale, langtag) != 0)
1172 : : {
1173 [ # # # # ]: 0 : ereport(NOTICE,
1174 : : (errmsg("using standard form \"%s\" for ICU locale \"%s\"",
1175 : : langtag, dblocale)));
1176 : :
1177 : 0 : dblocale = langtag;
1178 : 0 : }
1179 : 0 : }
1180 : :
1181 : 0 : icu_validate_locale(dblocale);
1182 : 0 : }
1183 : :
1184 : : /* for libc, locale comes from datcollate and datctype */
1185 [ - + ]: 5 : if (dblocprovider == COLLPROVIDER_LIBC)
1186 : 5 : dblocale = NULL;
1187 : :
1188 : : /*
1189 : : * Check that the new encoding and locale settings match the source
1190 : : * database. We insist on this because we simply copy the source data ---
1191 : : * any non-ASCII data would be wrongly encoded, and any indexes sorted
1192 : : * according to the source locale would be wrong.
1193 : : *
1194 : : * However, we assume that template0 doesn't contain any non-ASCII data
1195 : : * nor any indexes that depend on collation or ctype, so template0 can be
1196 : : * used as template for creating a database with any encoding or locale.
1197 : : */
1198 [ + + ]: 5 : if (strcmp(dbtemplate, "template0") != 0)
1199 : : {
1200 [ + - ]: 2 : if (encoding != src_encoding)
1201 [ # # # # ]: 0 : ereport(ERROR,
1202 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1203 : : errmsg("new encoding (%s) is incompatible with the encoding of the template database (%s)",
1204 : : pg_encoding_to_char(encoding),
1205 : : pg_encoding_to_char(src_encoding)),
1206 : : errhint("Use the same encoding as in the template database, or use template0 as template.")));
1207 : :
1208 [ + - ]: 2 : if (strcmp(dbcollate, src_collate) != 0)
1209 [ # # # # ]: 0 : ereport(ERROR,
1210 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1211 : : errmsg("new collation (%s) is incompatible with the collation of the template database (%s)",
1212 : : dbcollate, src_collate),
1213 : : errhint("Use the same collation as in the template database, or use template0 as template.")));
1214 : :
1215 [ + - ]: 2 : if (strcmp(dbctype, src_ctype) != 0)
1216 [ # # # # ]: 0 : ereport(ERROR,
1217 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1218 : : errmsg("new LC_CTYPE (%s) is incompatible with the LC_CTYPE of the template database (%s)",
1219 : : dbctype, src_ctype),
1220 : : errhint("Use the same LC_CTYPE as in the template database, or use template0 as template.")));
1221 : :
1222 [ + - ]: 2 : if (dblocprovider != src_locprovider)
1223 [ # # # # ]: 0 : ereport(ERROR,
1224 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1225 : : errmsg("new locale provider (%s) does not match locale provider of the template database (%s)",
1226 : : collprovider_name(dblocprovider), collprovider_name(src_locprovider)),
1227 : : errhint("Use the same locale provider as in the template database, or use template0 as template.")));
1228 : :
1229 [ + - ]: 2 : if (dblocprovider == COLLPROVIDER_ICU)
1230 : : {
1231 : 0 : char *val1;
1232 : 0 : char *val2;
1233 : :
1234 [ # # ]: 0 : Assert(dblocale);
1235 [ # # ]: 0 : Assert(src_locale);
1236 [ # # ]: 0 : if (strcmp(dblocale, src_locale) != 0)
1237 [ # # # # ]: 0 : ereport(ERROR,
1238 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1239 : : errmsg("new ICU locale (%s) is incompatible with the ICU locale of the template database (%s)",
1240 : : dblocale, src_locale),
1241 : : errhint("Use the same ICU locale as in the template database, or use template0 as template.")));
1242 : :
1243 : 0 : val1 = dbicurules;
1244 [ # # ]: 0 : if (!val1)
1245 : 0 : val1 = "";
1246 : 0 : val2 = src_icurules;
1247 [ # # ]: 0 : if (!val2)
1248 : 0 : val2 = "";
1249 [ # # ]: 0 : if (strcmp(val1, val2) != 0)
1250 [ # # # # ]: 0 : ereport(ERROR,
1251 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1252 : : errmsg("new ICU collation rules (%s) are incompatible with the ICU collation rules of the template database (%s)",
1253 : : val1, val2),
1254 : : errhint("Use the same ICU collation rules as in the template database, or use template0 as template.")));
1255 : 0 : }
1256 : 2 : }
1257 : :
1258 : : /*
1259 : : * If we got a collation version for the template database, check that it
1260 : : * matches the actual OS collation version. Otherwise error; the user
1261 : : * needs to fix the template database first. Don't complain if a
1262 : : * collation version was specified explicitly as a statement option; that
1263 : : * is used by pg_upgrade to reproduce the old state exactly.
1264 : : *
1265 : : * (If the template database has no collation version, then either the
1266 : : * platform/provider does not support collation versioning, or it's
1267 : : * template0, for which we stipulate that it does not contain
1268 : : * collation-using objects.)
1269 : : */
1270 [ - + # # ]: 5 : if (src_collversion && !collversionEl)
1271 : : {
1272 : 0 : char *actual_versionstr;
1273 : 0 : const char *locale;
1274 : :
1275 [ # # ]: 0 : if (dblocprovider == COLLPROVIDER_LIBC)
1276 : 0 : locale = dbcollate;
1277 : : else
1278 : 0 : locale = dblocale;
1279 : :
1280 : 0 : actual_versionstr = get_collation_actual_version(dblocprovider, locale);
1281 [ # # ]: 0 : if (!actual_versionstr)
1282 [ # # # # ]: 0 : ereport(ERROR,
1283 : : (errmsg("template database \"%s\" has a collation version, but no actual collation version could be determined",
1284 : : dbtemplate)));
1285 : :
1286 [ # # ]: 0 : if (strcmp(actual_versionstr, src_collversion) != 0)
1287 [ # # # # ]: 0 : ereport(ERROR,
1288 : : (errmsg("template database \"%s\" has a collation version mismatch",
1289 : : dbtemplate),
1290 : : errdetail("The template database was created using collation version %s, "
1291 : : "but the operating system provides version %s.",
1292 : : src_collversion, actual_versionstr),
1293 : : errhint("Rebuild all objects in the template database that use the default collation and run "
1294 : : "ALTER DATABASE %s REFRESH COLLATION VERSION, "
1295 : : "or build PostgreSQL with the right library version.",
1296 : : quote_identifier(dbtemplate))));
1297 : 0 : }
1298 : :
1299 [ - + ]: 5 : if (dbcollversion == NULL)
1300 : 5 : dbcollversion = src_collversion;
1301 : :
1302 : : /*
1303 : : * Normally, we copy the collation version from the template database.
1304 : : * This last resort only applies if the template database does not have a
1305 : : * collation version, which is normally only the case for template0.
1306 : : */
1307 [ - + ]: 5 : if (dbcollversion == NULL)
1308 : : {
1309 : 5 : const char *locale;
1310 : :
1311 [ + - ]: 5 : if (dblocprovider == COLLPROVIDER_LIBC)
1312 : 5 : locale = dbcollate;
1313 : : else
1314 : 0 : locale = dblocale;
1315 : :
1316 : 5 : dbcollversion = get_collation_actual_version(dblocprovider, locale);
1317 : 5 : }
1318 : :
1319 : : /* Resolve default tablespace for new database */
1320 [ - + # # ]: 5 : if (tablespacenameEl && tablespacenameEl->arg)
1321 : : {
1322 : 0 : char *tablespacename;
1323 : 0 : AclResult aclresult;
1324 : :
1325 : 0 : tablespacename = defGetString(tablespacenameEl);
1326 : 0 : dst_deftablespace = get_tablespace_oid(tablespacename, false);
1327 : : /* check permissions */
1328 : 0 : aclresult = object_aclcheck(TableSpaceRelationId, dst_deftablespace, GetUserId(),
1329 : : ACL_CREATE);
1330 [ # # ]: 0 : if (aclresult != ACLCHECK_OK)
1331 : 0 : aclcheck_error(aclresult, OBJECT_TABLESPACE,
1332 : 0 : tablespacename);
1333 : :
1334 : : /* pg_global must never be the default tablespace */
1335 [ # # ]: 0 : if (dst_deftablespace == GLOBALTABLESPACE_OID)
1336 [ # # # # ]: 0 : ereport(ERROR,
1337 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1338 : : errmsg("pg_global cannot be used as default tablespace")));
1339 : :
1340 : : /*
1341 : : * If we are trying to change the default tablespace of the template,
1342 : : * we require that the template not have any files in the new default
1343 : : * tablespace. This is necessary because otherwise the copied
1344 : : * database would contain pg_class rows that refer to its default
1345 : : * tablespace both explicitly (by OID) and implicitly (as zero), which
1346 : : * would cause problems. For example another CREATE DATABASE using
1347 : : * the copied database as template, and trying to change its default
1348 : : * tablespace again, would yield outright incorrect results (it would
1349 : : * improperly move tables to the new default tablespace that should
1350 : : * stay in the same tablespace).
1351 : : */
1352 [ # # ]: 0 : if (dst_deftablespace != src_deftablespace)
1353 : : {
1354 : 0 : char *srcpath;
1355 : 0 : struct stat st;
1356 : :
1357 : 0 : srcpath = GetDatabasePath(src_dboid, dst_deftablespace);
1358 : :
1359 [ # # ]: 0 : if (stat(srcpath, &st) == 0 &&
1360 [ # # # # ]: 0 : S_ISDIR(st.st_mode) &&
1361 : 0 : !directory_is_empty(srcpath))
1362 [ # # # # ]: 0 : ereport(ERROR,
1363 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1364 : : errmsg("cannot assign new default tablespace \"%s\"",
1365 : : tablespacename),
1366 : : errdetail("There is a conflict because database \"%s\" already has some tables in this tablespace.",
1367 : : dbtemplate)));
1368 : 0 : pfree(srcpath);
1369 : 0 : }
1370 : 0 : }
1371 : : else
1372 : : {
1373 : : /* Use template database's default tablespace */
1374 : 5 : dst_deftablespace = src_deftablespace;
1375 : : /* Note there is no additional permission check in this path */
1376 : : }
1377 : :
1378 : : /*
1379 : : * If built with appropriate switch, whine when regression-testing
1380 : : * conventions for database names are violated. But don't complain during
1381 : : * initdb.
1382 : : */
1383 : : #ifdef ENFORCE_REGRESSION_TEST_NAME_RESTRICTIONS
1384 : : if (IsUnderPostmaster && strstr(dbname, "regression") == NULL)
1385 : : elog(WARNING, "databases created by regression test cases should have names including \"regression\"");
1386 : : #endif
1387 : :
1388 : : /*
1389 : : * Check for db name conflict. This is just to give a more friendly error
1390 : : * message than "unique index violation". There's a race condition but
1391 : : * we're willing to accept the less friendly message in that case.
1392 : : */
1393 [ + - ]: 5 : if (OidIsValid(get_database_oid(dbname, true)))
1394 [ # # # # ]: 0 : ereport(ERROR,
1395 : : (errcode(ERRCODE_DUPLICATE_DATABASE),
1396 : : errmsg("database \"%s\" already exists", dbname)));
1397 : :
1398 : : /*
1399 : : * The source DB can't have any active backends, except this one
1400 : : * (exception is to allow CREATE DB while connected to template1).
1401 : : * Otherwise we might copy inconsistent data.
1402 : : *
1403 : : * This should be last among the basic error checks, because it involves
1404 : : * potential waiting; we may as well throw an error first if we're gonna
1405 : : * throw one.
1406 : : */
1407 [ + - ]: 5 : if (CountOtherDBBackends(src_dboid, ¬herbackends, &npreparedxacts))
1408 [ # # # # ]: 0 : ereport(ERROR,
1409 : : (errcode(ERRCODE_OBJECT_IN_USE),
1410 : : errmsg("source database \"%s\" is being accessed by other users",
1411 : : dbtemplate),
1412 : : errdetail_busy_db(notherbackends, npreparedxacts)));
1413 : :
1414 : : /*
1415 : : * Select an OID for the new database, checking that it doesn't have a
1416 : : * filename conflict with anything already existing in the tablespace
1417 : : * directories.
1418 : : */
1419 : 5 : pg_database_rel = table_open(DatabaseRelationId, RowExclusiveLock);
1420 : :
1421 : : /*
1422 : : * If database OID is configured, check if the OID is already in use or
1423 : : * data directory already exists.
1424 : : */
1425 [ + + ]: 5 : if (OidIsValid(dboid))
1426 : : {
1427 : 2 : char *existing_dbname = get_database_name(dboid);
1428 : :
1429 [ + - ]: 2 : if (existing_dbname != NULL)
1430 [ # # # # ]: 0 : ereport(ERROR,
1431 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE)),
1432 : : errmsg("database OID %u is already in use by database \"%s\"",
1433 : : dboid, existing_dbname));
1434 : :
1435 [ + - ]: 2 : if (check_db_file_conflict(dboid))
1436 [ # # # # ]: 0 : ereport(ERROR,
1437 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE)),
1438 : : errmsg("data directory with the specified OID %u already exists", dboid));
1439 : 2 : }
1440 : : else
1441 : : {
1442 : : /* Select an OID for the new database if is not explicitly configured. */
1443 : 3 : do
1444 : : {
1445 : 3 : dboid = GetNewOidWithIndex(pg_database_rel, DatabaseOidIndexId,
1446 : : Anum_pg_database_oid);
1447 [ - + ]: 3 : } while (check_db_file_conflict(dboid));
1448 : : }
1449 : :
1450 : : /*
1451 : : * Insert a new tuple into pg_database. This establishes our ownership of
1452 : : * the new database name (anyone else trying to insert the same name will
1453 : : * block on the unique index, and fail after we commit).
1454 : : */
1455 : :
1456 [ - + # # : 5 : Assert((dblocprovider != COLLPROVIDER_LIBC && dblocale) ||
+ - ]
1457 : : (dblocprovider == COLLPROVIDER_LIBC && !dblocale));
1458 : :
1459 : : /* Form tuple */
1460 : 5 : new_record[Anum_pg_database_oid - 1] = ObjectIdGetDatum(dboid);
1461 : 5 : new_record[Anum_pg_database_datname - 1] =
1462 : 5 : DirectFunctionCall1(namein, CStringGetDatum(dbname));
1463 : 5 : new_record[Anum_pg_database_datdba - 1] = ObjectIdGetDatum(datdba);
1464 : 5 : new_record[Anum_pg_database_encoding - 1] = Int32GetDatum(encoding);
1465 : 5 : new_record[Anum_pg_database_datlocprovider - 1] = CharGetDatum(dblocprovider);
1466 : 5 : new_record[Anum_pg_database_datistemplate - 1] = BoolGetDatum(dbistemplate);
1467 : 5 : new_record[Anum_pg_database_datallowconn - 1] = BoolGetDatum(dballowconnections);
1468 : 5 : new_record[Anum_pg_database_dathasloginevt - 1] = BoolGetDatum(src_hasloginevt);
1469 : 5 : new_record[Anum_pg_database_datconnlimit - 1] = Int32GetDatum(dbconnlimit);
1470 : 5 : new_record[Anum_pg_database_datfrozenxid - 1] = TransactionIdGetDatum(src_frozenxid);
1471 : 5 : new_record[Anum_pg_database_datminmxid - 1] = TransactionIdGetDatum(src_minmxid);
1472 : 5 : new_record[Anum_pg_database_dattablespace - 1] = ObjectIdGetDatum(dst_deftablespace);
1473 : 5 : new_record[Anum_pg_database_datcollate - 1] = CStringGetTextDatum(dbcollate);
1474 : 5 : new_record[Anum_pg_database_datctype - 1] = CStringGetTextDatum(dbctype);
1475 [ - + ]: 5 : if (dblocale)
1476 : 0 : new_record[Anum_pg_database_datlocale - 1] = CStringGetTextDatum(dblocale);
1477 : : else
1478 : 5 : new_record_nulls[Anum_pg_database_datlocale - 1] = true;
1479 [ - + ]: 5 : if (dbicurules)
1480 : 0 : new_record[Anum_pg_database_daticurules - 1] = CStringGetTextDatum(dbicurules);
1481 : : else
1482 : 5 : new_record_nulls[Anum_pg_database_daticurules - 1] = true;
1483 [ - + ]: 5 : if (dbcollversion)
1484 : 0 : new_record[Anum_pg_database_datcollversion - 1] = CStringGetTextDatum(dbcollversion);
1485 : : else
1486 : 5 : new_record_nulls[Anum_pg_database_datcollversion - 1] = true;
1487 : :
1488 : : /*
1489 : : * We deliberately set datacl to default (NULL), rather than copying it
1490 : : * from the template database. Copying it would be a bad idea when the
1491 : : * owner is not the same as the template's owner.
1492 : : */
1493 : 5 : new_record_nulls[Anum_pg_database_datacl - 1] = true;
1494 : :
1495 : 10 : tuple = heap_form_tuple(RelationGetDescr(pg_database_rel),
1496 : 5 : new_record, new_record_nulls);
1497 : :
1498 : 5 : CatalogTupleInsert(pg_database_rel, tuple);
1499 : :
1500 : : /*
1501 : : * Now generate additional catalog entries associated with the new DB
1502 : : */
1503 : :
1504 : : /* Register owner dependency */
1505 : 5 : recordDependencyOnOwner(DatabaseRelationId, dboid, datdba);
1506 : :
1507 : : /* Create pg_shdepend entries for objects within database */
1508 : 5 : copyTemplateDependencies(src_dboid, dboid);
1509 : :
1510 : : /* Post creation hook for new database */
1511 [ + - ]: 5 : InvokeObjectPostCreateHook(DatabaseRelationId, dboid, 0);
1512 : :
1513 : : /*
1514 : : * If we're going to be reading data for the to-be-created database into
1515 : : * shared_buffers, take a lock on it. Nobody should know that this
1516 : : * database exists yet, but it's good to maintain the invariant that an
1517 : : * AccessExclusiveLock on the database is sufficient to drop all of its
1518 : : * buffers without worrying about more being read later.
1519 : : *
1520 : : * Note that we need to do this before entering the
1521 : : * PG_ENSURE_ERROR_CLEANUP block below, because createdb_failure_callback
1522 : : * expects this lock to be held already.
1523 : : */
1524 [ + + ]: 5 : if (dbstrategy == CREATEDB_WAL_LOG)
1525 : 3 : LockSharedObject(DatabaseRelationId, dboid, 0, AccessShareLock);
1526 : :
1527 : : /*
1528 : : * Once we start copying subdirectories, we need to be able to clean 'em
1529 : : * up if we fail. Use an ENSURE block to make sure this happens. (This
1530 : : * is not a 100% solution, because of the possibility of failure during
1531 : : * transaction commit after we leave this routine, but it should handle
1532 : : * most scenarios.)
1533 : : */
1534 : 5 : fparms.src_dboid = src_dboid;
1535 : 5 : fparms.dest_dboid = dboid;
1536 : 5 : fparms.strategy = dbstrategy;
1537 : :
1538 [ + - ]: 5 : PG_ENSURE_ERROR_CLEANUP(createdb_failure_callback,
1539 : : PointerGetDatum(&fparms));
1540 : : {
1541 : : /*
1542 : : * If the user has asked to create a database with WAL_LOG strategy
1543 : : * then call CreateDatabaseUsingWalLog, which will copy the database
1544 : : * at the block level and it will WAL log each copied block.
1545 : : * Otherwise, call CreateDatabaseUsingFileCopy that will copy the
1546 : : * database file by file.
1547 : : */
1548 [ + + ]: 5 : if (dbstrategy == CREATEDB_WAL_LOG)
1549 : 6 : CreateDatabaseUsingWalLog(src_dboid, dboid, src_deftablespace,
1550 : 3 : dst_deftablespace);
1551 : : else
1552 : 4 : CreateDatabaseUsingFileCopy(src_dboid, dboid, src_deftablespace,
1553 : 2 : dst_deftablespace);
1554 : :
1555 : : /*
1556 : : * Close pg_database, but keep lock till commit.
1557 : : */
1558 : 5 : table_close(pg_database_rel, NoLock);
1559 : :
1560 : : /*
1561 : : * Force synchronous commit, thus minimizing the window between
1562 : : * creation of the database files and committal of the transaction. If
1563 : : * we crash before committing, we'll have a DB that's taking up disk
1564 : : * space but is not in pg_database, which is not good.
1565 : : */
1566 : 5 : ForceSyncCommit();
1567 : : }
1568 [ + - ]: 5 : PG_END_ENSURE_ERROR_CLEANUP(createdb_failure_callback,
1569 : : PointerGetDatum(&fparms));
1570 : :
1571 : 10 : return dboid;
1572 : 5 : }
1573 : :
1574 : : /*
1575 : : * Check whether chosen encoding matches chosen locale settings. This
1576 : : * restriction is necessary because libc's locale-specific code usually
1577 : : * fails when presented with data in an encoding it's not expecting. We
1578 : : * allow mismatch in four cases:
1579 : : *
1580 : : * 1. locale encoding = SQL_ASCII, which means that the locale is C/POSIX
1581 : : * which works with any encoding.
1582 : : *
1583 : : * 2. locale encoding = -1, which means that we couldn't determine the
1584 : : * locale's encoding and have to trust the user to get it right.
1585 : : *
1586 : : * 3. selected encoding is UTF8 and platform is win32. This is because
1587 : : * UTF8 is a pseudo codepage that is supported in all locales since it's
1588 : : * converted to UTF16 before being used.
1589 : : *
1590 : : * 4. selected encoding is SQL_ASCII, but only if you're a superuser. This
1591 : : * is risky but we have historically allowed it --- notably, the
1592 : : * regression tests require it.
1593 : : *
1594 : : * Note: if you change this policy, fix initdb to match.
1595 : : */
1596 : : void
1597 : 6 : check_encoding_locale_matches(int encoding, const char *collate, const char *ctype)
1598 : : {
1599 : 6 : int ctype_encoding = pg_get_encoding_from_locale(ctype, true);
1600 : 6 : int collate_encoding = pg_get_encoding_from_locale(collate, true);
1601 : :
1602 [ + + ]: 6 : if (!(ctype_encoding == encoding ||
1603 [ - + ]: 2 : ctype_encoding == PG_SQL_ASCII ||
1604 [ # # ]: 0 : ctype_encoding == -1 ||
1605 : : #ifdef WIN32
1606 : : encoding == PG_UTF8 ||
1607 : : #endif
1608 [ # # ]: 0 : (encoding == PG_SQL_ASCII && superuser())))
1609 [ # # # # ]: 0 : ereport(ERROR,
1610 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1611 : : errmsg("encoding \"%s\" does not match locale \"%s\"",
1612 : : pg_encoding_to_char(encoding),
1613 : : ctype),
1614 : : errdetail("The chosen LC_CTYPE setting requires encoding \"%s\".",
1615 : : pg_encoding_to_char(ctype_encoding))));
1616 : :
1617 [ + + ]: 6 : if (!(collate_encoding == encoding ||
1618 [ - + ]: 2 : collate_encoding == PG_SQL_ASCII ||
1619 [ # # ]: 0 : collate_encoding == -1 ||
1620 : : #ifdef WIN32
1621 : : encoding == PG_UTF8 ||
1622 : : #endif
1623 [ # # ]: 0 : (encoding == PG_SQL_ASCII && superuser())))
1624 [ # # # # ]: 0 : ereport(ERROR,
1625 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1626 : : errmsg("encoding \"%s\" does not match locale \"%s\"",
1627 : : pg_encoding_to_char(encoding),
1628 : : collate),
1629 : : errdetail("The chosen LC_COLLATE setting requires encoding \"%s\".",
1630 : : pg_encoding_to_char(collate_encoding))));
1631 : 6 : }
1632 : :
1633 : : /* Error cleanup callback for createdb */
1634 : : static void
1635 : 0 : createdb_failure_callback(int code, Datum arg)
1636 : : {
1637 : 0 : createdb_failure_params *fparms = (createdb_failure_params *) DatumGetPointer(arg);
1638 : :
1639 : : /*
1640 : : * If we were copying database at block levels then drop pages for the
1641 : : * destination database that are in the shared buffer cache. And tell
1642 : : * checkpointer to forget any pending fsync and unlink requests for files
1643 : : * in the database. The reasoning behind doing this is same as explained
1644 : : * in dropdb function. But unlike dropdb we don't need to call
1645 : : * pgstat_drop_database because this database is still not created so
1646 : : * there should not be any stat for this.
1647 : : */
1648 [ # # ]: 0 : if (fparms->strategy == CREATEDB_WAL_LOG)
1649 : : {
1650 : 0 : DropDatabaseBuffers(fparms->dest_dboid);
1651 : 0 : ForgetDatabaseSyncRequests(fparms->dest_dboid);
1652 : :
1653 : : /* Release lock on the target database. */
1654 : 0 : UnlockSharedObject(DatabaseRelationId, fparms->dest_dboid, 0,
1655 : : AccessShareLock);
1656 : 0 : }
1657 : :
1658 : : /*
1659 : : * Release lock on source database before doing recursive remove. This is
1660 : : * not essential but it seems desirable to release the lock as soon as
1661 : : * possible.
1662 : : */
1663 : 0 : UnlockSharedObject(DatabaseRelationId, fparms->src_dboid, 0, ShareLock);
1664 : :
1665 : : /* Throw away any successfully copied subdirectories */
1666 : 0 : remove_dbtablespaces(fparms->dest_dboid);
1667 : 0 : }
1668 : :
1669 : :
1670 : : /*
1671 : : * DROP DATABASE
1672 : : */
1673 : : void
1674 : 6 : dropdb(const char *dbname, bool missing_ok, bool force)
1675 : : {
1676 : 6 : Oid db_id;
1677 : 6 : bool db_istemplate;
1678 : 6 : Relation pgdbrel;
1679 : 6 : HeapTuple tup;
1680 : 6 : ScanKeyData scankey;
1681 : 6 : void *inplace_state;
1682 : 6 : Form_pg_database datform;
1683 : 6 : int notherbackends;
1684 : 6 : int npreparedxacts;
1685 : 6 : int nslots,
1686 : : nslots_active;
1687 : 6 : int nsubscriptions;
1688 : :
1689 : : /*
1690 : : * Look up the target database's OID, and get exclusive lock on it. We
1691 : : * need this to ensure that no new backend starts up in the target
1692 : : * database while we are deleting it (see postinit.c), and that no one is
1693 : : * using it as a CREATE DATABASE template or trying to delete it for
1694 : : * themselves.
1695 : : */
1696 : 6 : pgdbrel = table_open(DatabaseRelationId, RowExclusiveLock);
1697 : :
1698 [ + + ]: 6 : if (!get_db_info(dbname, AccessExclusiveLock, &db_id, NULL, NULL,
1699 : : &db_istemplate, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL))
1700 : : {
1701 [ + + ]: 5 : if (!missing_ok)
1702 : : {
1703 [ + - + - ]: 2 : ereport(ERROR,
1704 : : (errcode(ERRCODE_UNDEFINED_DATABASE),
1705 : : errmsg("database \"%s\" does not exist", dbname)));
1706 : 0 : }
1707 : : else
1708 : : {
1709 : : /* Close pg_database, release the lock, since we changed nothing */
1710 : 3 : table_close(pgdbrel, RowExclusiveLock);
1711 [ - + + + ]: 3 : ereport(NOTICE,
1712 : : (errmsg("database \"%s\" does not exist, skipping",
1713 : : dbname)));
1714 : 3 : return;
1715 : : }
1716 : 0 : }
1717 : :
1718 : : /*
1719 : : * Permission checks
1720 : : */
1721 [ + - ]: 1 : if (!object_ownercheck(DatabaseRelationId, db_id, GetUserId()))
1722 : 0 : aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_DATABASE,
1723 : 0 : dbname);
1724 : :
1725 : : /* DROP hook for the database being removed */
1726 [ + - ]: 1 : InvokeObjectDropHook(DatabaseRelationId, db_id, 0);
1727 : :
1728 : : /*
1729 : : * Disallow dropping a DB that is marked istemplate. This is just to
1730 : : * prevent people from accidentally dropping template0 or template1; they
1731 : : * can do so if they're really determined ...
1732 : : */
1733 [ + - ]: 1 : if (db_istemplate)
1734 [ # # # # ]: 0 : ereport(ERROR,
1735 : : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1736 : : errmsg("cannot drop a template database")));
1737 : :
1738 : : /* Obviously can't drop my own database */
1739 [ + - ]: 1 : if (db_id == MyDatabaseId)
1740 [ # # # # ]: 0 : ereport(ERROR,
1741 : : (errcode(ERRCODE_OBJECT_IN_USE),
1742 : : errmsg("cannot drop the currently open database")));
1743 : :
1744 : : /*
1745 : : * Check whether there are active logical slots that refer to the
1746 : : * to-be-dropped database. The database lock we are holding prevents the
1747 : : * creation of new slots using the database or existing slots becoming
1748 : : * active.
1749 : : */
1750 : 1 : (void) ReplicationSlotsCountDBSlots(db_id, &nslots, &nslots_active);
1751 [ + - ]: 1 : if (nslots_active)
1752 : : {
1753 [ # # # # ]: 0 : ereport(ERROR,
1754 : : (errcode(ERRCODE_OBJECT_IN_USE),
1755 : : errmsg("database \"%s\" is used by an active logical replication slot",
1756 : : dbname),
1757 : : errdetail_plural("There is %d active slot.",
1758 : : "There are %d active slots.",
1759 : : nslots_active, nslots_active)));
1760 : 0 : }
1761 : :
1762 : : /*
1763 : : * Check if there are subscriptions defined in the target database.
1764 : : *
1765 : : * We can't drop them automatically because they might be holding
1766 : : * resources in other databases/instances.
1767 : : */
1768 [ + - ]: 1 : if ((nsubscriptions = CountDBSubscriptions(db_id)) > 0)
1769 [ # # # # ]: 0 : ereport(ERROR,
1770 : : (errcode(ERRCODE_OBJECT_IN_USE),
1771 : : errmsg("database \"%s\" is being used by logical replication subscription",
1772 : : dbname),
1773 : : errdetail_plural("There is %d subscription.",
1774 : : "There are %d subscriptions.",
1775 : : nsubscriptions, nsubscriptions)));
1776 : :
1777 : :
1778 : : /*
1779 : : * Attempt to terminate all existing connections to the target database if
1780 : : * the user has requested to do so.
1781 : : */
1782 [ + - ]: 1 : if (force)
1783 : 0 : TerminateOtherDBBackends(db_id);
1784 : :
1785 : : /*
1786 : : * Check for other backends in the target database. (Because we hold the
1787 : : * database lock, no new ones can start after this.)
1788 : : *
1789 : : * As in CREATE DATABASE, check this after other error conditions.
1790 : : */
1791 [ + - ]: 1 : if (CountOtherDBBackends(db_id, ¬herbackends, &npreparedxacts))
1792 [ # # # # ]: 0 : ereport(ERROR,
1793 : : (errcode(ERRCODE_OBJECT_IN_USE),
1794 : : errmsg("database \"%s\" is being accessed by other users",
1795 : : dbname),
1796 : : errdetail_busy_db(notherbackends, npreparedxacts)));
1797 : :
1798 : : /*
1799 : : * Delete any comments or security labels associated with the database.
1800 : : */
1801 : 1 : DeleteSharedComments(db_id, DatabaseRelationId);
1802 : 1 : DeleteSharedSecurityLabel(db_id, DatabaseRelationId);
1803 : :
1804 : : /*
1805 : : * Remove settings associated with this database
1806 : : */
1807 : 1 : DropSetting(db_id, InvalidOid);
1808 : :
1809 : : /*
1810 : : * Remove shared dependency references for the database.
1811 : : */
1812 : 1 : dropDatabaseDependencies(db_id);
1813 : :
1814 : : /*
1815 : : * Tell the cumulative stats system to forget it immediately, too.
1816 : : */
1817 : 1 : pgstat_drop_database(db_id);
1818 : :
1819 : : /*
1820 : : * Except for the deletion of the catalog row, subsequent actions are not
1821 : : * transactional (consider DropDatabaseBuffers() discarding modified
1822 : : * buffers). But we might crash or get interrupted below. To prevent
1823 : : * accesses to a database with invalid contents, mark the database as
1824 : : * invalid using an in-place update.
1825 : : *
1826 : : * We need to flush the WAL before continuing, to guarantee the
1827 : : * modification is durable before performing irreversible filesystem
1828 : : * operations.
1829 : : */
1830 : 1 : ScanKeyInit(&scankey,
1831 : : Anum_pg_database_datname,
1832 : : BTEqualStrategyNumber, F_NAMEEQ,
1833 : 1 : CStringGetDatum(dbname));
1834 : 1 : systable_inplace_update_begin(pgdbrel, DatabaseNameIndexId, true,
1835 : : NULL, 1, &scankey, &tup, &inplace_state);
1836 [ + - ]: 1 : if (!HeapTupleIsValid(tup))
1837 [ # # # # ]: 0 : elog(ERROR, "cache lookup failed for database %u", db_id);
1838 : 1 : datform = (Form_pg_database) GETSTRUCT(tup);
1839 : 1 : datform->datconnlimit = DATCONNLIMIT_INVALID_DB;
1840 : 1 : systable_inplace_update_finish(inplace_state, tup);
1841 : 1 : XLogFlush(XactLastRecEnd);
1842 : :
1843 : : /*
1844 : : * Also delete the tuple - transactionally. If this transaction commits,
1845 : : * the row will be gone, but if we fail, dropdb() can be invoked again.
1846 : : */
1847 : 1 : CatalogTupleDelete(pgdbrel, &tup->t_self);
1848 : 1 : heap_freetuple(tup);
1849 : :
1850 : : /*
1851 : : * Drop db-specific replication slots.
1852 : : */
1853 : 1 : ReplicationSlotsDropDBSlots(db_id);
1854 : :
1855 : : /*
1856 : : * Drop pages for this database that are in the shared buffer cache. This
1857 : : * is important to ensure that no remaining backend tries to write out a
1858 : : * dirty buffer to the dead database later...
1859 : : */
1860 : 1 : DropDatabaseBuffers(db_id);
1861 : :
1862 : : /*
1863 : : * Tell checkpointer to forget any pending fsync and unlink requests for
1864 : : * files in the database; else the fsyncs will fail at next checkpoint, or
1865 : : * worse, it will delete files that belong to a newly created database
1866 : : * with the same OID.
1867 : : */
1868 : 1 : ForgetDatabaseSyncRequests(db_id);
1869 : :
1870 : : /*
1871 : : * Force a checkpoint to make sure the checkpointer has received the
1872 : : * message sent by ForgetDatabaseSyncRequests.
1873 : : */
1874 : 1 : RequestCheckpoint(CHECKPOINT_FAST | CHECKPOINT_FORCE | CHECKPOINT_WAIT);
1875 : :
1876 : : /* Close all smgr fds in all backends. */
1877 : 1 : WaitForProcSignalBarrier(EmitProcSignalBarrier(PROCSIGNAL_BARRIER_SMGRRELEASE));
1878 : :
1879 : : /*
1880 : : * Remove all tablespace subdirs belonging to the database.
1881 : : */
1882 : 1 : remove_dbtablespaces(db_id);
1883 : :
1884 : : /*
1885 : : * Close pg_database, but keep lock till commit.
1886 : : */
1887 : 1 : table_close(pgdbrel, NoLock);
1888 : :
1889 : : /*
1890 : : * Force synchronous commit, thus minimizing the window between removal of
1891 : : * the database files and committal of the transaction. If we crash before
1892 : : * committing, we'll have a DB that's gone on disk but still there
1893 : : * according to pg_database, which is not good.
1894 : : */
1895 : 1 : ForceSyncCommit();
1896 [ - + ]: 4 : }
1897 : :
1898 : :
1899 : : /*
1900 : : * Rename database
1901 : : */
1902 : : ObjectAddress
1903 : 2 : RenameDatabase(const char *oldname, const char *newname)
1904 : : {
1905 : 2 : Oid db_id;
1906 : 2 : HeapTuple newtup;
1907 : 2 : ItemPointerData otid;
1908 : 2 : Relation rel;
1909 : 2 : int notherbackends;
1910 : 2 : int npreparedxacts;
1911 : : ObjectAddress address;
1912 : :
1913 : : /*
1914 : : * Look up the target database's OID, and get exclusive lock on it. We
1915 : : * need this for the same reasons as DROP DATABASE.
1916 : : */
1917 : 2 : rel = table_open(DatabaseRelationId, RowExclusiveLock);
1918 : :
1919 [ + - ]: 2 : if (!get_db_info(oldname, AccessExclusiveLock, &db_id, NULL, NULL, NULL,
1920 : : NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL))
1921 [ # # # # ]: 0 : ereport(ERROR,
1922 : : (errcode(ERRCODE_UNDEFINED_DATABASE),
1923 : : errmsg("database \"%s\" does not exist", oldname)));
1924 : :
1925 : : /* must be owner */
1926 [ + - ]: 2 : if (!object_ownercheck(DatabaseRelationId, db_id, GetUserId()))
1927 : 0 : aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_DATABASE,
1928 : 0 : oldname);
1929 : :
1930 : : /* must have createdb rights */
1931 [ + - ]: 2 : if (!have_createdb_privilege())
1932 [ # # # # ]: 0 : ereport(ERROR,
1933 : : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1934 : : errmsg("permission denied to rename database")));
1935 : :
1936 : : /*
1937 : : * If built with appropriate switch, whine when regression-testing
1938 : : * conventions for database names are violated.
1939 : : */
1940 : : #ifdef ENFORCE_REGRESSION_TEST_NAME_RESTRICTIONS
1941 : : if (strstr(newname, "regression") == NULL)
1942 : : elog(WARNING, "databases created by regression test cases should have names including \"regression\"");
1943 : : #endif
1944 : :
1945 : : /*
1946 : : * Make sure the new name doesn't exist. See notes for same error in
1947 : : * CREATE DATABASE.
1948 : : */
1949 [ + - ]: 2 : if (OidIsValid(get_database_oid(newname, true)))
1950 [ # # # # ]: 0 : ereport(ERROR,
1951 : : (errcode(ERRCODE_DUPLICATE_DATABASE),
1952 : : errmsg("database \"%s\" already exists", newname)));
1953 : :
1954 : : /*
1955 : : * XXX Client applications probably store the current database somewhere,
1956 : : * so renaming it could cause confusion. On the other hand, there may not
1957 : : * be an actual problem besides a little confusion, so think about this
1958 : : * and decide.
1959 : : */
1960 [ + - ]: 2 : if (db_id == MyDatabaseId)
1961 [ # # # # ]: 0 : ereport(ERROR,
1962 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1963 : : errmsg("current database cannot be renamed")));
1964 : :
1965 : : /*
1966 : : * Make sure the database does not have active sessions. This is the same
1967 : : * concern as above, but applied to other sessions.
1968 : : *
1969 : : * As in CREATE DATABASE, check this after other error conditions.
1970 : : */
1971 [ + - ]: 2 : if (CountOtherDBBackends(db_id, ¬herbackends, &npreparedxacts))
1972 [ # # # # ]: 0 : ereport(ERROR,
1973 : : (errcode(ERRCODE_OBJECT_IN_USE),
1974 : : errmsg("database \"%s\" is being accessed by other users",
1975 : : oldname),
1976 : : errdetail_busy_db(notherbackends, npreparedxacts)));
1977 : :
1978 : : /* rename */
1979 : 2 : newtup = SearchSysCacheLockedCopy1(DATABASEOID, ObjectIdGetDatum(db_id));
1980 [ + - ]: 2 : if (!HeapTupleIsValid(newtup))
1981 [ # # # # ]: 0 : elog(ERROR, "cache lookup failed for database %u", db_id);
1982 : 2 : otid = newtup->t_self;
1983 : 2 : namestrcpy(&(((Form_pg_database) GETSTRUCT(newtup))->datname), newname);
1984 : 2 : CatalogTupleUpdate(rel, &otid, newtup);
1985 : 2 : UnlockTuple(rel, &otid, InplaceUpdateTupleLock);
1986 : :
1987 [ + - ]: 2 : InvokeObjectPostAlterHook(DatabaseRelationId, db_id, 0);
1988 : :
1989 : 2 : ObjectAddressSet(address, DatabaseRelationId, db_id);
1990 : :
1991 : : /*
1992 : : * Close pg_database, but keep lock till commit.
1993 : : */
1994 : 2 : table_close(rel, NoLock);
1995 : :
1996 : : return address;
1997 : 2 : }
1998 : :
1999 : :
2000 : : /*
2001 : : * ALTER DATABASE SET TABLESPACE
2002 : : */
2003 : : static void
2004 : 2 : movedb(const char *dbname, const char *tblspcname)
2005 : : {
2006 : 2 : Oid db_id;
2007 : 2 : Relation pgdbrel;
2008 : 2 : int notherbackends;
2009 : 2 : int npreparedxacts;
2010 : 2 : HeapTuple oldtuple,
2011 : : newtuple;
2012 : 2 : Oid src_tblspcoid,
2013 : : dst_tblspcoid;
2014 : 2 : ScanKeyData scankey;
2015 : 2 : SysScanDesc sysscan;
2016 : 2 : AclResult aclresult;
2017 : 2 : char *src_dbpath;
2018 : 2 : char *dst_dbpath;
2019 : 2 : DIR *dstdir;
2020 : 2 : struct dirent *xlde;
2021 : 2 : movedb_failure_params fparms;
2022 : :
2023 : : /*
2024 : : * Look up the target database's OID, and get exclusive lock on it. We
2025 : : * need this to ensure that no new backend starts up in the database while
2026 : : * we are moving it, and that no one is using it as a CREATE DATABASE
2027 : : * template or trying to delete it.
2028 : : */
2029 : 2 : pgdbrel = table_open(DatabaseRelationId, RowExclusiveLock);
2030 : :
2031 [ + - ]: 2 : if (!get_db_info(dbname, AccessExclusiveLock, &db_id, NULL, NULL, NULL,
2032 : : NULL, NULL, NULL, NULL, &src_tblspcoid, NULL, NULL, NULL, NULL, NULL, NULL))
2033 [ # # # # ]: 0 : ereport(ERROR,
2034 : : (errcode(ERRCODE_UNDEFINED_DATABASE),
2035 : : errmsg("database \"%s\" does not exist", dbname)));
2036 : :
2037 : : /*
2038 : : * We actually need a session lock, so that the lock will persist across
2039 : : * the commit/restart below. (We could almost get away with letting the
2040 : : * lock be released at commit, except that someone could try to move
2041 : : * relations of the DB back into the old directory while we rmtree() it.)
2042 : : */
2043 : 2 : LockSharedObjectForSession(DatabaseRelationId, db_id, 0,
2044 : : AccessExclusiveLock);
2045 : :
2046 : : /*
2047 : : * Permission checks
2048 : : */
2049 [ + - ]: 2 : if (!object_ownercheck(DatabaseRelationId, db_id, GetUserId()))
2050 : 0 : aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_DATABASE,
2051 : 0 : dbname);
2052 : :
2053 : : /*
2054 : : * Obviously can't move the tables of my own database
2055 : : */
2056 [ + - ]: 2 : if (db_id == MyDatabaseId)
2057 [ # # # # ]: 0 : ereport(ERROR,
2058 : : (errcode(ERRCODE_OBJECT_IN_USE),
2059 : : errmsg("cannot change the tablespace of the currently open database")));
2060 : :
2061 : : /*
2062 : : * Get tablespace's oid
2063 : : */
2064 : 2 : dst_tblspcoid = get_tablespace_oid(tblspcname, false);
2065 : :
2066 : : /*
2067 : : * Permission checks
2068 : : */
2069 : 2 : aclresult = object_aclcheck(TableSpaceRelationId, dst_tblspcoid, GetUserId(),
2070 : : ACL_CREATE);
2071 [ - + ]: 2 : if (aclresult != ACLCHECK_OK)
2072 : 0 : aclcheck_error(aclresult, OBJECT_TABLESPACE,
2073 : 0 : tblspcname);
2074 : :
2075 : : /*
2076 : : * pg_global must never be the default tablespace
2077 : : */
2078 [ + - ]: 2 : if (dst_tblspcoid == GLOBALTABLESPACE_OID)
2079 [ # # # # ]: 0 : ereport(ERROR,
2080 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2081 : : errmsg("pg_global cannot be used as default tablespace")));
2082 : :
2083 : : /*
2084 : : * No-op if same tablespace
2085 : : */
2086 [ - + ]: 2 : if (src_tblspcoid == dst_tblspcoid)
2087 : : {
2088 : 0 : table_close(pgdbrel, NoLock);
2089 : 0 : UnlockSharedObjectForSession(DatabaseRelationId, db_id, 0,
2090 : : AccessExclusiveLock);
2091 : 0 : return;
2092 : : }
2093 : :
2094 : : /*
2095 : : * Check for other backends in the target database. (Because we hold the
2096 : : * database lock, no new ones can start after this.)
2097 : : *
2098 : : * As in CREATE DATABASE, check this after other error conditions.
2099 : : */
2100 [ + - ]: 2 : if (CountOtherDBBackends(db_id, ¬herbackends, &npreparedxacts))
2101 [ # # # # ]: 0 : ereport(ERROR,
2102 : : (errcode(ERRCODE_OBJECT_IN_USE),
2103 : : errmsg("database \"%s\" is being accessed by other users",
2104 : : dbname),
2105 : : errdetail_busy_db(notherbackends, npreparedxacts)));
2106 : :
2107 : : /*
2108 : : * Get old and new database paths
2109 : : */
2110 : 2 : src_dbpath = GetDatabasePath(db_id, src_tblspcoid);
2111 : 2 : dst_dbpath = GetDatabasePath(db_id, dst_tblspcoid);
2112 : :
2113 : : /*
2114 : : * Force a checkpoint before proceeding. This will force all dirty
2115 : : * buffers, including those of unlogged tables, out to disk, to ensure
2116 : : * source database is up-to-date on disk for the copy.
2117 : : * FlushDatabaseBuffers() would suffice for that, but we also want to
2118 : : * process any pending unlink requests. Otherwise, the check for existing
2119 : : * files in the target directory might fail unnecessarily, not to mention
2120 : : * that the copy might fail due to source files getting deleted under it.
2121 : : * On Windows, this also ensures that background procs don't hold any open
2122 : : * files, which would cause rmdir() to fail.
2123 : : */
2124 : 2 : RequestCheckpoint(CHECKPOINT_FAST | CHECKPOINT_FORCE | CHECKPOINT_WAIT
2125 : : | CHECKPOINT_FLUSH_UNLOGGED);
2126 : :
2127 : : /* Close all smgr fds in all backends. */
2128 : 2 : WaitForProcSignalBarrier(EmitProcSignalBarrier(PROCSIGNAL_BARRIER_SMGRRELEASE));
2129 : :
2130 : : /*
2131 : : * Now drop all buffers holding data of the target database; they should
2132 : : * no longer be dirty so DropDatabaseBuffers is safe.
2133 : : *
2134 : : * It might seem that we could just let these buffers age out of shared
2135 : : * buffers naturally, since they should not get referenced anymore. The
2136 : : * problem with that is that if the user later moves the database back to
2137 : : * its original tablespace, any still-surviving buffers would appear to
2138 : : * contain valid data again --- but they'd be missing any changes made in
2139 : : * the database while it was in the new tablespace. In any case, freeing
2140 : : * buffers that should never be used again seems worth the cycles.
2141 : : *
2142 : : * Note: it'd be sufficient to get rid of buffers matching db_id and
2143 : : * src_tblspcoid, but bufmgr.c presently provides no API for that.
2144 : : */
2145 : 2 : DropDatabaseBuffers(db_id);
2146 : :
2147 : : /*
2148 : : * Check for existence of files in the target directory, i.e., objects of
2149 : : * this database that are already in the target tablespace. We can't
2150 : : * allow the move in such a case, because we would need to change those
2151 : : * relations' pg_class.reltablespace entries to zero, and we don't have
2152 : : * access to the DB's pg_class to do so.
2153 : : */
2154 : 2 : dstdir = AllocateDir(dst_dbpath);
2155 [ + - ]: 2 : if (dstdir != NULL)
2156 : : {
2157 [ # # ]: 0 : while ((xlde = ReadDir(dstdir, dst_dbpath)) != NULL)
2158 : : {
2159 [ # # # # ]: 0 : if (strcmp(xlde->d_name, ".") == 0 ||
2160 : 0 : strcmp(xlde->d_name, "..") == 0)
2161 : 0 : continue;
2162 : :
2163 [ # # # # ]: 0 : ereport(ERROR,
2164 : : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
2165 : : errmsg("some relations of database \"%s\" are already in tablespace \"%s\"",
2166 : : dbname, tblspcname),
2167 : : errhint("You must move them back to the database's default tablespace before using this command.")));
2168 : : }
2169 : :
2170 : 0 : FreeDir(dstdir);
2171 : :
2172 : : /*
2173 : : * The directory exists but is empty. We must remove it before using
2174 : : * the copydir function.
2175 : : */
2176 [ # # ]: 0 : if (rmdir(dst_dbpath) != 0)
2177 [ # # # # ]: 0 : elog(ERROR, "could not remove directory \"%s\": %m",
2178 : : dst_dbpath);
2179 : 0 : }
2180 : :
2181 : : /*
2182 : : * Use an ENSURE block to make sure we remove the debris if the copy fails
2183 : : * (eg, due to out-of-disk-space). This is not a 100% solution, because
2184 : : * of the possibility of failure during transaction commit, but it should
2185 : : * handle most scenarios.
2186 : : */
2187 : 2 : fparms.dest_dboid = db_id;
2188 : 2 : fparms.dest_tsoid = dst_tblspcoid;
2189 [ + - ]: 2 : PG_ENSURE_ERROR_CLEANUP(movedb_failure_callback,
2190 : : PointerGetDatum(&fparms));
2191 : : {
2192 : 2 : Datum new_record[Natts_pg_database] = {0};
2193 : 2 : bool new_record_nulls[Natts_pg_database] = {0};
2194 : 2 : bool new_record_repl[Natts_pg_database] = {0};
2195 : :
2196 : : /*
2197 : : * Copy files from the old tablespace to the new one
2198 : : */
2199 : 2 : copydir(src_dbpath, dst_dbpath, false);
2200 : :
2201 : : /*
2202 : : * Record the filesystem change in XLOG
2203 : : */
2204 : : {
2205 : 2 : xl_dbase_create_file_copy_rec xlrec;
2206 : :
2207 : 2 : xlrec.db_id = db_id;
2208 : 2 : xlrec.tablespace_id = dst_tblspcoid;
2209 : 2 : xlrec.src_db_id = db_id;
2210 : 2 : xlrec.src_tablespace_id = src_tblspcoid;
2211 : :
2212 : 2 : XLogBeginInsert();
2213 : 2 : XLogRegisterData(&xlrec,
2214 : : sizeof(xl_dbase_create_file_copy_rec));
2215 : :
2216 : 2 : (void) XLogInsert(RM_DBASE_ID,
2217 : : XLOG_DBASE_CREATE_FILE_COPY | XLR_SPECIAL_REL_UPDATE);
2218 : 2 : }
2219 : :
2220 : : /*
2221 : : * Update the database's pg_database tuple
2222 : : */
2223 : 2 : ScanKeyInit(&scankey,
2224 : : Anum_pg_database_datname,
2225 : : BTEqualStrategyNumber, F_NAMEEQ,
2226 : 2 : CStringGetDatum(dbname));
2227 : 2 : sysscan = systable_beginscan(pgdbrel, DatabaseNameIndexId, true,
2228 : : NULL, 1, &scankey);
2229 : 2 : oldtuple = systable_getnext(sysscan);
2230 [ + - ]: 2 : if (!HeapTupleIsValid(oldtuple)) /* shouldn't happen... */
2231 [ # # # # ]: 0 : ereport(ERROR,
2232 : : (errcode(ERRCODE_UNDEFINED_DATABASE),
2233 : : errmsg("database \"%s\" does not exist", dbname)));
2234 : 2 : LockTuple(pgdbrel, &oldtuple->t_self, InplaceUpdateTupleLock);
2235 : :
2236 : 2 : new_record[Anum_pg_database_dattablespace - 1] = ObjectIdGetDatum(dst_tblspcoid);
2237 : 2 : new_record_repl[Anum_pg_database_dattablespace - 1] = true;
2238 : :
2239 : 4 : newtuple = heap_modify_tuple(oldtuple, RelationGetDescr(pgdbrel),
2240 : 2 : new_record,
2241 : 2 : new_record_nulls, new_record_repl);
2242 : 2 : CatalogTupleUpdate(pgdbrel, &oldtuple->t_self, newtuple);
2243 : 2 : UnlockTuple(pgdbrel, &oldtuple->t_self, InplaceUpdateTupleLock);
2244 : :
2245 [ + - ]: 2 : InvokeObjectPostAlterHook(DatabaseRelationId, db_id, 0);
2246 : :
2247 : 2 : systable_endscan(sysscan);
2248 : :
2249 : : /*
2250 : : * Force another checkpoint here. As in CREATE DATABASE, this is to
2251 : : * ensure that we don't have to replay a committed
2252 : : * XLOG_DBASE_CREATE_FILE_COPY operation, which would cause us to lose
2253 : : * any unlogged operations done in the new DB tablespace before the
2254 : : * next checkpoint.
2255 : : */
2256 : 2 : RequestCheckpoint(CHECKPOINT_FAST | CHECKPOINT_FORCE | CHECKPOINT_WAIT);
2257 : :
2258 : : /*
2259 : : * Force synchronous commit, thus minimizing the window between
2260 : : * copying the database files and committal of the transaction. If we
2261 : : * crash before committing, we'll leave an orphaned set of files on
2262 : : * disk, which is not fatal but not good either.
2263 : : */
2264 : 2 : ForceSyncCommit();
2265 : :
2266 : : /*
2267 : : * Close pg_database, but keep lock till commit.
2268 : : */
2269 : 2 : table_close(pgdbrel, NoLock);
2270 : 2 : }
2271 [ + - ]: 2 : PG_END_ENSURE_ERROR_CLEANUP(movedb_failure_callback,
2272 : : PointerGetDatum(&fparms));
2273 : :
2274 : : /*
2275 : : * Commit the transaction so that the pg_database update is committed. If
2276 : : * we crash while removing files, the database won't be corrupt, we'll
2277 : : * just leave some orphaned files in the old directory.
2278 : : *
2279 : : * (This is OK because we know we aren't inside a transaction block.)
2280 : : *
2281 : : * XXX would it be safe/better to do this inside the ensure block? Not
2282 : : * convinced it's a good idea; consider elog just after the transaction
2283 : : * really commits.
2284 : : */
2285 : 2 : PopActiveSnapshot();
2286 : 2 : CommitTransactionCommand();
2287 : :
2288 : : /* Start new transaction for the remaining work; don't need a snapshot */
2289 : 2 : StartTransactionCommand();
2290 : :
2291 : : /*
2292 : : * Remove files from the old tablespace
2293 : : */
2294 [ + - ]: 2 : if (!rmtree(src_dbpath, true))
2295 [ # # # # ]: 0 : ereport(WARNING,
2296 : : (errmsg("some useless files may be left behind in old database directory \"%s\"",
2297 : : src_dbpath)));
2298 : :
2299 : : /*
2300 : : * Record the filesystem change in XLOG
2301 : : */
2302 : : {
2303 : 2 : xl_dbase_drop_rec xlrec;
2304 : :
2305 : 2 : xlrec.db_id = db_id;
2306 : 2 : xlrec.ntablespaces = 1;
2307 : :
2308 : 2 : XLogBeginInsert();
2309 : 2 : XLogRegisterData(&xlrec, sizeof(xl_dbase_drop_rec));
2310 : 2 : XLogRegisterData(&src_tblspcoid, sizeof(Oid));
2311 : :
2312 : 2 : (void) XLogInsert(RM_DBASE_ID,
2313 : : XLOG_DBASE_DROP | XLR_SPECIAL_REL_UPDATE);
2314 : 2 : }
2315 : :
2316 : : /* Now it's safe to release the database lock */
2317 : 2 : UnlockSharedObjectForSession(DatabaseRelationId, db_id, 0,
2318 : : AccessExclusiveLock);
2319 : :
2320 : 2 : pfree(src_dbpath);
2321 : 2 : pfree(dst_dbpath);
2322 [ - + ]: 2 : }
2323 : :
2324 : : /* Error cleanup callback for movedb */
2325 : : static void
2326 : 0 : movedb_failure_callback(int code, Datum arg)
2327 : : {
2328 : 0 : movedb_failure_params *fparms = (movedb_failure_params *) DatumGetPointer(arg);
2329 : 0 : char *dstpath;
2330 : :
2331 : : /* Get rid of anything we managed to copy to the target directory */
2332 : 0 : dstpath = GetDatabasePath(fparms->dest_dboid, fparms->dest_tsoid);
2333 : :
2334 : 0 : (void) rmtree(dstpath, true);
2335 : :
2336 : 0 : pfree(dstpath);
2337 : 0 : }
2338 : :
2339 : : /*
2340 : : * Process options and call dropdb function.
2341 : : */
2342 : : void
2343 : 6 : DropDatabase(ParseState *pstate, DropdbStmt *stmt)
2344 : : {
2345 : 6 : bool force = false;
2346 : 6 : ListCell *lc;
2347 : :
2348 [ + + + + : 10 : foreach(lc, stmt->options)
+ + ]
2349 : : {
2350 : 4 : DefElem *opt = (DefElem *) lfirst(lc);
2351 : :
2352 [ + - ]: 4 : if (strcmp(opt->defname, "force") == 0)
2353 : 4 : force = true;
2354 : : else
2355 [ # # # # ]: 0 : ereport(ERROR,
2356 : : (errcode(ERRCODE_SYNTAX_ERROR),
2357 : : errmsg("unrecognized %s option \"%s\"",
2358 : : "DROP DATABASE", opt->defname),
2359 : : parser_errposition(pstate, opt->location)));
2360 : 4 : }
2361 : :
2362 : 6 : dropdb(stmt->dbname, stmt->missing_ok, force);
2363 : 6 : }
2364 : :
2365 : : /*
2366 : : * ALTER DATABASE name ...
2367 : : */
2368 : : Oid
2369 : 3 : AlterDatabase(ParseState *pstate, AlterDatabaseStmt *stmt, bool isTopLevel)
2370 : : {
2371 : 3 : Relation rel;
2372 : 3 : Oid dboid;
2373 : 3 : HeapTuple tuple,
2374 : : newtuple;
2375 : 3 : Form_pg_database datform;
2376 : 3 : ScanKeyData scankey;
2377 : 3 : SysScanDesc scan;
2378 : 3 : ListCell *option;
2379 : 3 : bool dbistemplate = false;
2380 : 3 : bool dballowconnections = true;
2381 : 3 : int dbconnlimit = DATCONNLIMIT_UNLIMITED;
2382 : 3 : DefElem *distemplate = NULL;
2383 : 3 : DefElem *dallowconnections = NULL;
2384 : 3 : DefElem *dconnlimit = NULL;
2385 : 3 : DefElem *dtablespace = NULL;
2386 : 3 : Datum new_record[Natts_pg_database] = {0};
2387 : 3 : bool new_record_nulls[Natts_pg_database] = {0};
2388 : 3 : bool new_record_repl[Natts_pg_database] = {0};
2389 : :
2390 : : /* Extract options from the statement node tree */
2391 [ + - + + : 6 : foreach(option, stmt->options)
+ + ]
2392 : : {
2393 : 3 : DefElem *defel = (DefElem *) lfirst(option);
2394 : :
2395 [ + - ]: 3 : if (strcmp(defel->defname, "is_template") == 0)
2396 : : {
2397 [ # # ]: 0 : if (distemplate)
2398 : 0 : errorConflictingDefElem(defel, pstate);
2399 : 0 : distemplate = defel;
2400 : 0 : }
2401 [ + - ]: 3 : else if (strcmp(defel->defname, "allow_connections") == 0)
2402 : : {
2403 [ # # ]: 0 : if (dallowconnections)
2404 : 0 : errorConflictingDefElem(defel, pstate);
2405 : 0 : dallowconnections = defel;
2406 : 0 : }
2407 [ + + ]: 3 : else if (strcmp(defel->defname, "connection_limit") == 0)
2408 : : {
2409 [ + - ]: 1 : if (dconnlimit)
2410 : 0 : errorConflictingDefElem(defel, pstate);
2411 : 1 : dconnlimit = defel;
2412 : 1 : }
2413 [ + - ]: 2 : else if (strcmp(defel->defname, "tablespace") == 0)
2414 : : {
2415 [ + - ]: 2 : if (dtablespace)
2416 : 0 : errorConflictingDefElem(defel, pstate);
2417 : 2 : dtablespace = defel;
2418 : 2 : }
2419 : : else
2420 [ # # # # ]: 0 : ereport(ERROR,
2421 : : (errcode(ERRCODE_SYNTAX_ERROR),
2422 : : errmsg("option \"%s\" not recognized", defel->defname),
2423 : : parser_errposition(pstate, defel->location)));
2424 : 3 : }
2425 : :
2426 [ + + ]: 3 : if (dtablespace)
2427 : : {
2428 : : /*
2429 : : * While the SET TABLESPACE syntax doesn't allow any other options,
2430 : : * somebody could write "WITH TABLESPACE ...". Forbid any other
2431 : : * options from being specified in that case.
2432 : : */
2433 [ + - ]: 2 : if (list_length(stmt->options) != 1)
2434 [ # # # # ]: 0 : ereport(ERROR,
2435 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2436 : : errmsg("option \"%s\" cannot be specified with other options",
2437 : : dtablespace->defname),
2438 : : parser_errposition(pstate, dtablespace->location)));
2439 : : /* this case isn't allowed within a transaction block */
2440 : 2 : PreventInTransactionBlock(isTopLevel, "ALTER DATABASE SET TABLESPACE");
2441 : 2 : movedb(stmt->dbname, defGetString(dtablespace));
2442 : 2 : return InvalidOid;
2443 : : }
2444 : :
2445 [ - + # # ]: 1 : if (distemplate && distemplate->arg)
2446 : 0 : dbistemplate = defGetBoolean(distemplate);
2447 [ - + # # ]: 1 : if (dallowconnections && dallowconnections->arg)
2448 : 0 : dballowconnections = defGetBoolean(dallowconnections);
2449 [ + - - + ]: 1 : if (dconnlimit && dconnlimit->arg)
2450 : : {
2451 : 1 : dbconnlimit = defGetInt32(dconnlimit);
2452 [ + - ]: 1 : if (dbconnlimit < DATCONNLIMIT_UNLIMITED)
2453 [ # # # # ]: 0 : ereport(ERROR,
2454 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2455 : : errmsg("invalid connection limit: %d", dbconnlimit)));
2456 : 1 : }
2457 : :
2458 : : /*
2459 : : * Get the old tuple. We don't need a lock on the database per se,
2460 : : * because we're not going to do anything that would mess up incoming
2461 : : * connections.
2462 : : */
2463 : 1 : rel = table_open(DatabaseRelationId, RowExclusiveLock);
2464 : 1 : ScanKeyInit(&scankey,
2465 : : Anum_pg_database_datname,
2466 : : BTEqualStrategyNumber, F_NAMEEQ,
2467 : 1 : CStringGetDatum(stmt->dbname));
2468 : 1 : scan = systable_beginscan(rel, DatabaseNameIndexId, true,
2469 : : NULL, 1, &scankey);
2470 : 1 : tuple = systable_getnext(scan);
2471 [ + - ]: 1 : if (!HeapTupleIsValid(tuple))
2472 [ # # # # ]: 0 : ereport(ERROR,
2473 : : (errcode(ERRCODE_UNDEFINED_DATABASE),
2474 : : errmsg("database \"%s\" does not exist", stmt->dbname)));
2475 : 1 : LockTuple(rel, &tuple->t_self, InplaceUpdateTupleLock);
2476 : :
2477 : 1 : datform = (Form_pg_database) GETSTRUCT(tuple);
2478 : 1 : dboid = datform->oid;
2479 : :
2480 [ + - ]: 1 : if (database_is_invalid_form(datform))
2481 : : {
2482 [ # # # # ]: 0 : ereport(FATAL,
2483 : : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
2484 : : errmsg("cannot alter invalid database \"%s\"", stmt->dbname),
2485 : : errhint("Use DROP DATABASE to drop invalid databases."));
2486 : 0 : }
2487 : :
2488 [ + - ]: 1 : if (!object_ownercheck(DatabaseRelationId, dboid, GetUserId()))
2489 : 0 : aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_DATABASE,
2490 : 0 : stmt->dbname);
2491 : :
2492 : : /*
2493 : : * In order to avoid getting locked out and having to go through
2494 : : * standalone mode, we refuse to disallow connections to the database
2495 : : * we're currently connected to. Lockout can still happen with concurrent
2496 : : * sessions but the likeliness of that is not high enough to worry about.
2497 : : */
2498 [ - + # # ]: 1 : if (!dballowconnections && dboid == MyDatabaseId)
2499 [ # # # # ]: 0 : ereport(ERROR,
2500 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
2501 : : errmsg("cannot disallow connections for current database")));
2502 : :
2503 : : /*
2504 : : * Build an updated tuple, perusing the information just obtained
2505 : : */
2506 [ + - ]: 1 : if (distemplate)
2507 : : {
2508 : 0 : new_record[Anum_pg_database_datistemplate - 1] = BoolGetDatum(dbistemplate);
2509 : 0 : new_record_repl[Anum_pg_database_datistemplate - 1] = true;
2510 : 0 : }
2511 [ + - ]: 1 : if (dallowconnections)
2512 : : {
2513 : 0 : new_record[Anum_pg_database_datallowconn - 1] = BoolGetDatum(dballowconnections);
2514 : 0 : new_record_repl[Anum_pg_database_datallowconn - 1] = true;
2515 : 0 : }
2516 [ - + ]: 1 : if (dconnlimit)
2517 : : {
2518 : 1 : new_record[Anum_pg_database_datconnlimit - 1] = Int32GetDatum(dbconnlimit);
2519 : 1 : new_record_repl[Anum_pg_database_datconnlimit - 1] = true;
2520 : 1 : }
2521 : :
2522 : 2 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(rel), new_record,
2523 : 1 : new_record_nulls, new_record_repl);
2524 : 1 : CatalogTupleUpdate(rel, &tuple->t_self, newtuple);
2525 : 1 : UnlockTuple(rel, &tuple->t_self, InplaceUpdateTupleLock);
2526 : :
2527 [ + - ]: 1 : InvokeObjectPostAlterHook(DatabaseRelationId, dboid, 0);
2528 : :
2529 : 1 : systable_endscan(scan);
2530 : :
2531 : : /* Close pg_database, but keep lock till commit */
2532 : 1 : table_close(rel, NoLock);
2533 : :
2534 : 1 : return dboid;
2535 : 3 : }
2536 : :
2537 : :
2538 : : /*
2539 : : * ALTER DATABASE name REFRESH COLLATION VERSION
2540 : : */
2541 : : ObjectAddress
2542 : 1 : AlterDatabaseRefreshColl(AlterDatabaseRefreshCollStmt *stmt)
2543 : : {
2544 : 1 : Relation rel;
2545 : 1 : ScanKeyData scankey;
2546 : 1 : SysScanDesc scan;
2547 : 1 : Oid db_id;
2548 : 1 : HeapTuple tuple;
2549 : 1 : Form_pg_database datForm;
2550 : : ObjectAddress address;
2551 : 1 : Datum datum;
2552 : 1 : bool isnull;
2553 : 1 : char *oldversion;
2554 : 1 : char *newversion;
2555 : :
2556 : 1 : rel = table_open(DatabaseRelationId, RowExclusiveLock);
2557 : 1 : ScanKeyInit(&scankey,
2558 : : Anum_pg_database_datname,
2559 : : BTEqualStrategyNumber, F_NAMEEQ,
2560 : 1 : CStringGetDatum(stmt->dbname));
2561 : 1 : scan = systable_beginscan(rel, DatabaseNameIndexId, true,
2562 : : NULL, 1, &scankey);
2563 : 1 : tuple = systable_getnext(scan);
2564 [ + - ]: 1 : if (!HeapTupleIsValid(tuple))
2565 [ # # # # ]: 0 : ereport(ERROR,
2566 : : (errcode(ERRCODE_UNDEFINED_DATABASE),
2567 : : errmsg("database \"%s\" does not exist", stmt->dbname)));
2568 : :
2569 : 1 : datForm = (Form_pg_database) GETSTRUCT(tuple);
2570 : 1 : db_id = datForm->oid;
2571 : :
2572 [ + - ]: 1 : if (!object_ownercheck(DatabaseRelationId, db_id, GetUserId()))
2573 : 0 : aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_DATABASE,
2574 : 0 : stmt->dbname);
2575 : 1 : LockTuple(rel, &tuple->t_self, InplaceUpdateTupleLock);
2576 : :
2577 : 1 : datum = heap_getattr(tuple, Anum_pg_database_datcollversion, RelationGetDescr(rel), &isnull);
2578 [ + - ]: 1 : oldversion = isnull ? NULL : TextDatumGetCString(datum);
2579 : :
2580 [ + - ]: 1 : if (datForm->datlocprovider == COLLPROVIDER_LIBC)
2581 : : {
2582 : 1 : datum = heap_getattr(tuple, Anum_pg_database_datcollate, RelationGetDescr(rel), &isnull);
2583 [ + - ]: 1 : if (isnull)
2584 [ # # # # ]: 0 : elog(ERROR, "unexpected null in pg_database");
2585 : 1 : }
2586 : : else
2587 : : {
2588 : 0 : datum = heap_getattr(tuple, Anum_pg_database_datlocale, RelationGetDescr(rel), &isnull);
2589 [ # # ]: 0 : if (isnull)
2590 [ # # # # ]: 0 : elog(ERROR, "unexpected null in pg_database");
2591 : : }
2592 : :
2593 : 2 : newversion = get_collation_actual_version(datForm->datlocprovider,
2594 : 1 : TextDatumGetCString(datum));
2595 : :
2596 : : /* cannot change from NULL to non-NULL or vice versa */
2597 [ + - - + : 1 : if ((!oldversion && newversion) || (oldversion && !newversion))
# # ]
2598 [ # # # # ]: 0 : elog(ERROR, "invalid collation version change");
2599 [ - + # # : 1 : else if (oldversion && newversion && strcmp(newversion, oldversion) != 0)
# # ]
2600 : : {
2601 : 0 : bool nulls[Natts_pg_database] = {0};
2602 : 0 : bool replaces[Natts_pg_database] = {0};
2603 : 0 : Datum values[Natts_pg_database] = {0};
2604 : 0 : HeapTuple newtuple;
2605 : :
2606 [ # # # # ]: 0 : ereport(NOTICE,
2607 : : (errmsg("changing version from %s to %s",
2608 : : oldversion, newversion)));
2609 : :
2610 : 0 : values[Anum_pg_database_datcollversion - 1] = CStringGetTextDatum(newversion);
2611 : 0 : replaces[Anum_pg_database_datcollversion - 1] = true;
2612 : :
2613 : 0 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(rel),
2614 : 0 : values, nulls, replaces);
2615 : 0 : CatalogTupleUpdate(rel, &tuple->t_self, newtuple);
2616 : 0 : heap_freetuple(newtuple);
2617 : 0 : }
2618 : : else
2619 [ - + + - ]: 1 : ereport(NOTICE,
2620 : : (errmsg("version has not changed")));
2621 : 1 : UnlockTuple(rel, &tuple->t_self, InplaceUpdateTupleLock);
2622 : :
2623 [ + - ]: 1 : InvokeObjectPostAlterHook(DatabaseRelationId, db_id, 0);
2624 : :
2625 : 1 : ObjectAddressSet(address, DatabaseRelationId, db_id);
2626 : :
2627 : 1 : systable_endscan(scan);
2628 : :
2629 : 1 : table_close(rel, NoLock);
2630 : :
2631 : : return address;
2632 : 1 : }
2633 : :
2634 : :
2635 : : /*
2636 : : * ALTER DATABASE name SET ...
2637 : : */
2638 : : Oid
2639 : 12 : AlterDatabaseSet(AlterDatabaseSetStmt *stmt)
2640 : : {
2641 : 12 : Oid datid = get_database_oid(stmt->dbname, false);
2642 : :
2643 : : /*
2644 : : * Obtain a lock on the database and make sure it didn't go away in the
2645 : : * meantime.
2646 : : */
2647 : 12 : shdepLockAndCheckObject(DatabaseRelationId, datid);
2648 : :
2649 [ + - ]: 12 : if (!object_ownercheck(DatabaseRelationId, datid, GetUserId()))
2650 : 0 : aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_DATABASE,
2651 : 0 : stmt->dbname);
2652 : :
2653 : 12 : AlterSetting(datid, InvalidOid, stmt->setstmt);
2654 : :
2655 : 12 : UnlockSharedObject(DatabaseRelationId, datid, 0, AccessShareLock);
2656 : :
2657 : 24 : return datid;
2658 : 12 : }
2659 : :
2660 : :
2661 : : /*
2662 : : * ALTER DATABASE name OWNER TO newowner
2663 : : */
2664 : : ObjectAddress
2665 : 2 : AlterDatabaseOwner(const char *dbname, Oid newOwnerId)
2666 : : {
2667 : 2 : Oid db_id;
2668 : 2 : HeapTuple tuple;
2669 : 2 : Relation rel;
2670 : 2 : ScanKeyData scankey;
2671 : 2 : SysScanDesc scan;
2672 : 2 : Form_pg_database datForm;
2673 : : ObjectAddress address;
2674 : :
2675 : : /*
2676 : : * Get the old tuple. We don't need a lock on the database per se,
2677 : : * because we're not going to do anything that would mess up incoming
2678 : : * connections.
2679 : : */
2680 : 2 : rel = table_open(DatabaseRelationId, RowExclusiveLock);
2681 : 2 : ScanKeyInit(&scankey,
2682 : : Anum_pg_database_datname,
2683 : : BTEqualStrategyNumber, F_NAMEEQ,
2684 : 2 : CStringGetDatum(dbname));
2685 : 2 : scan = systable_beginscan(rel, DatabaseNameIndexId, true,
2686 : : NULL, 1, &scankey);
2687 : 2 : tuple = systable_getnext(scan);
2688 [ + - ]: 2 : if (!HeapTupleIsValid(tuple))
2689 [ # # # # ]: 0 : ereport(ERROR,
2690 : : (errcode(ERRCODE_UNDEFINED_DATABASE),
2691 : : errmsg("database \"%s\" does not exist", dbname)));
2692 : :
2693 : 2 : datForm = (Form_pg_database) GETSTRUCT(tuple);
2694 : 2 : db_id = datForm->oid;
2695 : :
2696 : : /*
2697 : : * If the new owner is the same as the existing owner, consider the
2698 : : * command to have succeeded. This is to be consistent with other
2699 : : * objects.
2700 : : */
2701 [ - + ]: 2 : if (datForm->datdba != newOwnerId)
2702 : : {
2703 : 2 : Datum repl_val[Natts_pg_database];
2704 : 2 : bool repl_null[Natts_pg_database] = {0};
2705 : 2 : bool repl_repl[Natts_pg_database] = {0};
2706 : 2 : Acl *newAcl;
2707 : 2 : Datum aclDatum;
2708 : 2 : bool isNull;
2709 : 2 : HeapTuple newtuple;
2710 : :
2711 : : /* Otherwise, must be owner of the existing object */
2712 [ + - ]: 2 : if (!object_ownercheck(DatabaseRelationId, db_id, GetUserId()))
2713 : 0 : aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_DATABASE,
2714 : 0 : dbname);
2715 : :
2716 : : /* Must be able to become new owner */
2717 : 2 : check_can_set_role(GetUserId(), newOwnerId);
2718 : :
2719 : : /*
2720 : : * must have createdb rights
2721 : : *
2722 : : * NOTE: This is different from other alter-owner checks in that the
2723 : : * current user is checked for createdb privileges instead of the
2724 : : * destination owner. This is consistent with the CREATE case for
2725 : : * databases. Because superusers will always have this right, we need
2726 : : * no special case for them.
2727 : : */
2728 [ + - ]: 2 : if (!have_createdb_privilege())
2729 [ # # # # ]: 0 : ereport(ERROR,
2730 : : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
2731 : : errmsg("permission denied to change owner of database")));
2732 : :
2733 : 2 : LockTuple(rel, &tuple->t_self, InplaceUpdateTupleLock);
2734 : :
2735 : 2 : repl_repl[Anum_pg_database_datdba - 1] = true;
2736 : 2 : repl_val[Anum_pg_database_datdba - 1] = ObjectIdGetDatum(newOwnerId);
2737 : :
2738 : : /*
2739 : : * Determine the modified ACL for the new owner. This is only
2740 : : * necessary when the ACL is non-null.
2741 : : */
2742 : 4 : aclDatum = heap_getattr(tuple,
2743 : : Anum_pg_database_datacl,
2744 : 2 : RelationGetDescr(rel),
2745 : : &isNull);
2746 [ + - ]: 2 : if (!isNull)
2747 : : {
2748 : 0 : newAcl = aclnewowner(DatumGetAclP(aclDatum),
2749 : 0 : datForm->datdba, newOwnerId);
2750 : 0 : repl_repl[Anum_pg_database_datacl - 1] = true;
2751 : 0 : repl_val[Anum_pg_database_datacl - 1] = PointerGetDatum(newAcl);
2752 : 0 : }
2753 : :
2754 : 2 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(rel), repl_val, repl_null, repl_repl);
2755 : 2 : CatalogTupleUpdate(rel, &newtuple->t_self, newtuple);
2756 : 2 : UnlockTuple(rel, &tuple->t_self, InplaceUpdateTupleLock);
2757 : :
2758 : 2 : heap_freetuple(newtuple);
2759 : :
2760 : : /* Update owner dependency reference */
2761 : 2 : changeDependencyOnOwner(DatabaseRelationId, db_id, newOwnerId);
2762 : 2 : }
2763 : :
2764 [ + - ]: 2 : InvokeObjectPostAlterHook(DatabaseRelationId, db_id, 0);
2765 : :
2766 : 2 : ObjectAddressSet(address, DatabaseRelationId, db_id);
2767 : :
2768 : 2 : systable_endscan(scan);
2769 : :
2770 : : /* Close pg_database, but keep lock till commit */
2771 : 2 : table_close(rel, NoLock);
2772 : :
2773 : : return address;
2774 : 2 : }
2775 : :
2776 : :
2777 : : Datum
2778 : 1 : pg_database_collation_actual_version(PG_FUNCTION_ARGS)
2779 : : {
2780 : 1 : Oid dbid = PG_GETARG_OID(0);
2781 : 1 : HeapTuple tp;
2782 : 1 : char datlocprovider;
2783 : 1 : Datum datum;
2784 : 1 : char *version;
2785 : :
2786 : 1 : tp = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(dbid));
2787 [ + - ]: 1 : if (!HeapTupleIsValid(tp))
2788 [ # # # # ]: 0 : ereport(ERROR,
2789 : : (errcode(ERRCODE_UNDEFINED_OBJECT),
2790 : : errmsg("database with OID %u does not exist", dbid)));
2791 : :
2792 : 1 : datlocprovider = ((Form_pg_database) GETSTRUCT(tp))->datlocprovider;
2793 : :
2794 [ + - ]: 1 : if (datlocprovider == COLLPROVIDER_LIBC)
2795 : 1 : datum = SysCacheGetAttrNotNull(DATABASEOID, tp, Anum_pg_database_datcollate);
2796 : : else
2797 : 0 : datum = SysCacheGetAttrNotNull(DATABASEOID, tp, Anum_pg_database_datlocale);
2798 : :
2799 : 2 : version = get_collation_actual_version(datlocprovider,
2800 : 1 : TextDatumGetCString(datum));
2801 : :
2802 : 1 : ReleaseSysCache(tp);
2803 : :
2804 [ - + ]: 1 : if (version)
2805 : 0 : PG_RETURN_TEXT_P(cstring_to_text(version));
2806 : : else
2807 : 1 : PG_RETURN_NULL();
2808 [ - + ]: 1 : }
2809 : :
2810 : :
2811 : : /*
2812 : : * Helper functions
2813 : : */
2814 : :
2815 : : /*
2816 : : * Look up info about the database named "name". If the database exists,
2817 : : * obtain the specified lock type on it, fill in any of the remaining
2818 : : * parameters that aren't NULL, and return true. If no such database,
2819 : : * return false.
2820 : : */
2821 : : static bool
2822 : 15 : get_db_info(const char *name, LOCKMODE lockmode,
2823 : : Oid *dbIdP, Oid *ownerIdP,
2824 : : int *encodingP, bool *dbIsTemplateP, bool *dbAllowConnP, bool *dbHasLoginEvtP,
2825 : : TransactionId *dbFrozenXidP, MultiXactId *dbMinMultiP,
2826 : : Oid *dbTablespace, char **dbCollate, char **dbCtype, char **dbLocale,
2827 : : char **dbIcurules,
2828 : : char *dbLocProvider,
2829 : : char **dbCollversion)
2830 : : {
2831 : 15 : bool result = false;
2832 : 15 : Relation relation;
2833 : :
2834 [ + - ]: 15 : Assert(name);
2835 : :
2836 : : /* Caller may wish to grab a better lock on pg_database beforehand... */
2837 : 15 : relation = table_open(DatabaseRelationId, AccessShareLock);
2838 : :
2839 : : /*
2840 : : * Loop covers the rare case where the database is renamed before we can
2841 : : * lock it. We try again just in case we can find a new one of the same
2842 : : * name.
2843 : : */
2844 : 15 : for (;;)
2845 : : {
2846 : 15 : ScanKeyData scanKey;
2847 : 15 : SysScanDesc scan;
2848 : 15 : HeapTuple tuple;
2849 : 15 : Oid dbOid;
2850 : :
2851 : : /*
2852 : : * there's no syscache for database-indexed-by-name, so must do it the
2853 : : * hard way
2854 : : */
2855 : 15 : ScanKeyInit(&scanKey,
2856 : : Anum_pg_database_datname,
2857 : : BTEqualStrategyNumber, F_NAMEEQ,
2858 : 15 : CStringGetDatum(name));
2859 : :
2860 : 15 : scan = systable_beginscan(relation, DatabaseNameIndexId, true,
2861 : : NULL, 1, &scanKey);
2862 : :
2863 : 15 : tuple = systable_getnext(scan);
2864 : :
2865 [ + + ]: 15 : if (!HeapTupleIsValid(tuple))
2866 : : {
2867 : : /* definitely no database of that name */
2868 : 5 : systable_endscan(scan);
2869 : 5 : break;
2870 : : }
2871 : :
2872 : 10 : dbOid = ((Form_pg_database) GETSTRUCT(tuple))->oid;
2873 : :
2874 : 10 : systable_endscan(scan);
2875 : :
2876 : : /*
2877 : : * Now that we have a database OID, we can try to lock the DB.
2878 : : */
2879 [ - + ]: 10 : if (lockmode != NoLock)
2880 : 10 : LockSharedObject(DatabaseRelationId, dbOid, 0, lockmode);
2881 : :
2882 : : /*
2883 : : * And now, re-fetch the tuple by OID. If it's still there and still
2884 : : * the same name, we win; else, drop the lock and loop back to try
2885 : : * again.
2886 : : */
2887 : 10 : tuple = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(dbOid));
2888 [ - + ]: 10 : if (HeapTupleIsValid(tuple))
2889 : : {
2890 : 10 : Form_pg_database dbform = (Form_pg_database) GETSTRUCT(tuple);
2891 : :
2892 [ - + ]: 10 : if (strcmp(name, NameStr(dbform->datname)) == 0)
2893 : : {
2894 : 10 : Datum datum;
2895 : 10 : bool isnull;
2896 : :
2897 : : /* oid of the database */
2898 [ - + ]: 10 : if (dbIdP)
2899 : 10 : *dbIdP = dbOid;
2900 : : /* oid of the owner */
2901 [ + + ]: 10 : if (ownerIdP)
2902 : 5 : *ownerIdP = dbform->datdba;
2903 : : /* character encoding */
2904 [ + + ]: 10 : if (encodingP)
2905 : 5 : *encodingP = dbform->encoding;
2906 : : /* allowed as template? */
2907 [ + + ]: 10 : if (dbIsTemplateP)
2908 : 6 : *dbIsTemplateP = dbform->datistemplate;
2909 : : /* Has on login event trigger? */
2910 [ + + ]: 10 : if (dbHasLoginEvtP)
2911 : 5 : *dbHasLoginEvtP = dbform->dathasloginevt;
2912 : : /* allowing connections? */
2913 [ + + ]: 10 : if (dbAllowConnP)
2914 : 5 : *dbAllowConnP = dbform->datallowconn;
2915 : : /* limit of frozen XIDs */
2916 [ + + ]: 10 : if (dbFrozenXidP)
2917 : 5 : *dbFrozenXidP = dbform->datfrozenxid;
2918 : : /* minimum MultiXactId */
2919 [ + + ]: 10 : if (dbMinMultiP)
2920 : 5 : *dbMinMultiP = dbform->datminmxid;
2921 : : /* default tablespace for this database */
2922 [ + + ]: 10 : if (dbTablespace)
2923 : 7 : *dbTablespace = dbform->dattablespace;
2924 : : /* default locale settings for this database */
2925 [ + + ]: 10 : if (dbLocProvider)
2926 : 5 : *dbLocProvider = dbform->datlocprovider;
2927 [ + + ]: 10 : if (dbCollate)
2928 : : {
2929 : 5 : datum = SysCacheGetAttrNotNull(DATABASEOID, tuple, Anum_pg_database_datcollate);
2930 : 5 : *dbCollate = TextDatumGetCString(datum);
2931 : 5 : }
2932 [ + + ]: 10 : if (dbCtype)
2933 : : {
2934 : 5 : datum = SysCacheGetAttrNotNull(DATABASEOID, tuple, Anum_pg_database_datctype);
2935 : 5 : *dbCtype = TextDatumGetCString(datum);
2936 : 5 : }
2937 [ + + ]: 10 : if (dbLocale)
2938 : : {
2939 : 5 : datum = SysCacheGetAttr(DATABASEOID, tuple, Anum_pg_database_datlocale, &isnull);
2940 [ + - ]: 5 : if (isnull)
2941 : 5 : *dbLocale = NULL;
2942 : : else
2943 : 0 : *dbLocale = TextDatumGetCString(datum);
2944 : 5 : }
2945 [ + + ]: 10 : if (dbIcurules)
2946 : : {
2947 : 5 : datum = SysCacheGetAttr(DATABASEOID, tuple, Anum_pg_database_daticurules, &isnull);
2948 [ + - ]: 5 : if (isnull)
2949 : 5 : *dbIcurules = NULL;
2950 : : else
2951 : 0 : *dbIcurules = TextDatumGetCString(datum);
2952 : 5 : }
2953 [ + + ]: 10 : if (dbCollversion)
2954 : : {
2955 : 5 : datum = SysCacheGetAttr(DATABASEOID, tuple, Anum_pg_database_datcollversion, &isnull);
2956 [ + - ]: 5 : if (isnull)
2957 : 5 : *dbCollversion = NULL;
2958 : : else
2959 : 0 : *dbCollversion = TextDatumGetCString(datum);
2960 : 5 : }
2961 : 10 : ReleaseSysCache(tuple);
2962 : 10 : result = true;
2963 : : break;
2964 : 10 : }
2965 : : /* can only get here if it was just renamed */
2966 : 0 : ReleaseSysCache(tuple);
2967 [ + - ]: 10 : }
2968 : :
2969 [ # # ]: 0 : if (lockmode != NoLock)
2970 : 0 : UnlockSharedObject(DatabaseRelationId, dbOid, 0, lockmode);
2971 [ - - + ]: 15 : }
2972 : :
2973 : 15 : table_close(relation, AccessShareLock);
2974 : :
2975 : 30 : return result;
2976 : 15 : }
2977 : :
2978 : : /* Check if current user has createdb privileges */
2979 : : bool
2980 : 15 : have_createdb_privilege(void)
2981 : : {
2982 : 15 : bool result = false;
2983 : 15 : HeapTuple utup;
2984 : :
2985 : : /* Superusers can always do everything */
2986 [ + + ]: 15 : if (superuser())
2987 : 9 : return true;
2988 : :
2989 : 6 : utup = SearchSysCache1(AUTHOID, ObjectIdGetDatum(GetUserId()));
2990 [ - + ]: 6 : if (HeapTupleIsValid(utup))
2991 : : {
2992 : 6 : result = ((Form_pg_authid) GETSTRUCT(utup))->rolcreatedb;
2993 : 6 : ReleaseSysCache(utup);
2994 : 6 : }
2995 : 6 : return result;
2996 : 15 : }
2997 : :
2998 : : /*
2999 : : * Remove tablespace directories
3000 : : *
3001 : : * We don't know what tablespaces db_id is using, so iterate through all
3002 : : * tablespaces removing <tablespace>/db_id
3003 : : */
3004 : : static void
3005 : 1 : remove_dbtablespaces(Oid db_id)
3006 : : {
3007 : 1 : Relation rel;
3008 : 1 : TableScanDesc scan;
3009 : 1 : HeapTuple tuple;
3010 : 1 : List *ltblspc = NIL;
3011 : 1 : ListCell *cell;
3012 : 1 : int ntblspc;
3013 : 1 : int i;
3014 : 1 : Oid *tablespace_ids;
3015 : :
3016 : 1 : rel = table_open(TableSpaceRelationId, AccessShareLock);
3017 : 1 : scan = table_beginscan_catalog(rel, 0, NULL);
3018 [ + + ]: 4 : while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
3019 : : {
3020 : 3 : Form_pg_tablespace spcform = (Form_pg_tablespace) GETSTRUCT(tuple);
3021 : 3 : Oid dsttablespace = spcform->oid;
3022 : 3 : char *dstpath;
3023 : 3 : struct stat st;
3024 : :
3025 : : /* Don't mess with the global tablespace */
3026 [ + + ]: 3 : if (dsttablespace == GLOBALTABLESPACE_OID)
3027 : 1 : continue;
3028 : :
3029 : 2 : dstpath = GetDatabasePath(db_id, dsttablespace);
3030 : :
3031 [ + + - + ]: 2 : if (lstat(dstpath, &st) < 0 || !S_ISDIR(st.st_mode))
3032 : : {
3033 : : /* Assume we can ignore it */
3034 : 1 : pfree(dstpath);
3035 : 1 : continue;
3036 : : }
3037 : :
3038 [ + - ]: 1 : if (!rmtree(dstpath, true))
3039 [ # # # # ]: 0 : ereport(WARNING,
3040 : : (errmsg("some useless files may be left behind in old database directory \"%s\"",
3041 : : dstpath)));
3042 : :
3043 : 1 : ltblspc = lappend_oid(ltblspc, dsttablespace);
3044 : 1 : pfree(dstpath);
3045 [ + + ]: 3 : }
3046 : :
3047 : 1 : ntblspc = list_length(ltblspc);
3048 [ + - ]: 1 : if (ntblspc == 0)
3049 : : {
3050 : 0 : table_endscan(scan);
3051 : 0 : table_close(rel, AccessShareLock);
3052 : 0 : return;
3053 : : }
3054 : :
3055 : 1 : tablespace_ids = (Oid *) palloc(ntblspc * sizeof(Oid));
3056 : 1 : i = 0;
3057 [ + - + + : 2 : foreach(cell, ltblspc)
+ + ]
3058 : 1 : tablespace_ids[i++] = lfirst_oid(cell);
3059 : :
3060 : : /* Record the filesystem change in XLOG */
3061 : : {
3062 : 1 : xl_dbase_drop_rec xlrec;
3063 : :
3064 : 1 : xlrec.db_id = db_id;
3065 : 1 : xlrec.ntablespaces = ntblspc;
3066 : :
3067 : 1 : XLogBeginInsert();
3068 : 1 : XLogRegisterData(&xlrec, MinSizeOfDbaseDropRec);
3069 : 1 : XLogRegisterData(tablespace_ids, ntblspc * sizeof(Oid));
3070 : :
3071 : 1 : (void) XLogInsert(RM_DBASE_ID,
3072 : : XLOG_DBASE_DROP | XLR_SPECIAL_REL_UPDATE);
3073 : 1 : }
3074 : :
3075 : 1 : list_free(ltblspc);
3076 : 1 : pfree(tablespace_ids);
3077 : :
3078 : 1 : table_endscan(scan);
3079 : 1 : table_close(rel, AccessShareLock);
3080 : 1 : }
3081 : :
3082 : : /*
3083 : : * Check for existing files that conflict with a proposed new DB OID;
3084 : : * return true if there are any
3085 : : *
3086 : : * If there were a subdirectory in any tablespace matching the proposed new
3087 : : * OID, we'd get a create failure due to the duplicate name ... and then we'd
3088 : : * try to remove that already-existing subdirectory during the cleanup in
3089 : : * remove_dbtablespaces. Nuking existing files seems like a bad idea, so
3090 : : * instead we make this extra check before settling on the OID of the new
3091 : : * database. This exactly parallels what GetNewRelFileNumber() does for table
3092 : : * relfilenumber values.
3093 : : */
3094 : : static bool
3095 : 5 : check_db_file_conflict(Oid db_id)
3096 : : {
3097 : 5 : bool result = false;
3098 : 5 : Relation rel;
3099 : 5 : TableScanDesc scan;
3100 : 5 : HeapTuple tuple;
3101 : :
3102 : 5 : rel = table_open(TableSpaceRelationId, AccessShareLock);
3103 : 5 : scan = table_beginscan_catalog(rel, 0, NULL);
3104 [ + + ]: 16 : while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
3105 : : {
3106 : 11 : Form_pg_tablespace spcform = (Form_pg_tablespace) GETSTRUCT(tuple);
3107 : 11 : Oid dsttablespace = spcform->oid;
3108 : 11 : char *dstpath;
3109 : 11 : struct stat st;
3110 : :
3111 : : /* Don't mess with the global tablespace */
3112 [ + + ]: 11 : if (dsttablespace == GLOBALTABLESPACE_OID)
3113 : 5 : continue;
3114 : :
3115 : 6 : dstpath = GetDatabasePath(db_id, dsttablespace);
3116 : :
3117 [ - + ]: 6 : if (lstat(dstpath, &st) == 0)
3118 : : {
3119 : : /* Found a conflicting file (or directory, whatever) */
3120 : 0 : pfree(dstpath);
3121 : 0 : result = true;
3122 : 0 : break;
3123 : : }
3124 : :
3125 : 6 : pfree(dstpath);
3126 [ - + + ]: 11 : }
3127 : :
3128 : 5 : table_endscan(scan);
3129 : 5 : table_close(rel, AccessShareLock);
3130 : :
3131 : 10 : return result;
3132 : 5 : }
3133 : :
3134 : : /*
3135 : : * Issue a suitable errdetail message for a busy database
3136 : : */
3137 : : static int
3138 : 0 : errdetail_busy_db(int notherbackends, int npreparedxacts)
3139 : : {
3140 [ # # # # ]: 0 : if (notherbackends > 0 && npreparedxacts > 0)
3141 : :
3142 : : /*
3143 : : * We don't deal with singular versus plural here, since gettext
3144 : : * doesn't support multiple plurals in one string.
3145 : : */
3146 : 0 : errdetail("There are %d other session(s) and %d prepared transaction(s) using the database.",
3147 : 0 : notherbackends, npreparedxacts);
3148 [ # # ]: 0 : else if (notherbackends > 0)
3149 : 0 : errdetail_plural("There is %d other session using the database.",
3150 : : "There are %d other sessions using the database.",
3151 : 0 : notherbackends,
3152 : 0 : notherbackends);
3153 : : else
3154 : 0 : errdetail_plural("There is %d prepared transaction using the database.",
3155 : : "There are %d prepared transactions using the database.",
3156 : 0 : npreparedxacts,
3157 : 0 : npreparedxacts);
3158 : 0 : return 0; /* just to keep ereport macro happy */
3159 : : }
3160 : :
3161 : : /*
3162 : : * get_database_oid - given a database name, look up the OID
3163 : : *
3164 : : * If missing_ok is false, throw an error if database name not found. If
3165 : : * true, just return InvalidOid.
3166 : : */
3167 : : Oid
3168 : 53 : get_database_oid(const char *dbname, bool missing_ok)
3169 : : {
3170 : 53 : Relation pg_database;
3171 : 53 : ScanKeyData entry[1];
3172 : 53 : SysScanDesc scan;
3173 : 53 : HeapTuple dbtuple;
3174 : 53 : Oid oid;
3175 : :
3176 : : /*
3177 : : * There's no syscache for pg_database indexed by name, so we must look
3178 : : * the hard way.
3179 : : */
3180 : 53 : pg_database = table_open(DatabaseRelationId, AccessShareLock);
3181 : 106 : ScanKeyInit(&entry[0],
3182 : : Anum_pg_database_datname,
3183 : : BTEqualStrategyNumber, F_NAMEEQ,
3184 : 53 : CStringGetDatum(dbname));
3185 : 106 : scan = systable_beginscan(pg_database, DatabaseNameIndexId, true,
3186 : 53 : NULL, 1, entry);
3187 : :
3188 : 53 : dbtuple = systable_getnext(scan);
3189 : :
3190 : : /* We assume that there can be at most one matching tuple */
3191 [ + + ]: 53 : if (HeapTupleIsValid(dbtuple))
3192 : 40 : oid = ((Form_pg_database) GETSTRUCT(dbtuple))->oid;
3193 : : else
3194 : 13 : oid = InvalidOid;
3195 : :
3196 : 53 : systable_endscan(scan);
3197 : 53 : table_close(pg_database, AccessShareLock);
3198 : :
3199 [ + + + + ]: 53 : if (!OidIsValid(oid) && !missing_ok)
3200 [ + - + - ]: 1 : ereport(ERROR,
3201 : : (errcode(ERRCODE_UNDEFINED_DATABASE),
3202 : : errmsg("database \"%s\" does not exist",
3203 : : dbname)));
3204 : :
3205 : 104 : return oid;
3206 : 52 : }
3207 : :
3208 : :
3209 : : /*
3210 : : * While dropping a database the pg_database row is marked invalid, but the
3211 : : * catalog contents still exist. Connections to such a database are not
3212 : : * allowed.
3213 : : */
3214 : : bool
3215 : 810 : database_is_invalid_form(Form_pg_database datform)
3216 : : {
3217 : 810 : return datform->datconnlimit == DATCONNLIMIT_INVALID_DB;
3218 : : }
3219 : :
3220 : :
3221 : : /*
3222 : : * Convenience wrapper around database_is_invalid_form()
3223 : : */
3224 : : bool
3225 : 5 : database_is_invalid_oid(Oid dboid)
3226 : : {
3227 : 5 : HeapTuple dbtup;
3228 : 5 : Form_pg_database dbform;
3229 : 5 : bool invalid;
3230 : :
3231 : 5 : dbtup = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(dboid));
3232 [ + - ]: 5 : if (!HeapTupleIsValid(dbtup))
3233 [ # # # # ]: 0 : elog(ERROR, "cache lookup failed for database %u", dboid);
3234 : 5 : dbform = (Form_pg_database) GETSTRUCT(dbtup);
3235 : :
3236 : 5 : invalid = database_is_invalid_form(dbform);
3237 : :
3238 : 5 : ReleaseSysCache(dbtup);
3239 : :
3240 : 10 : return invalid;
3241 : 5 : }
3242 : :
3243 : :
3244 : : /*
3245 : : * recovery_create_dbdir()
3246 : : *
3247 : : * During recovery, there's a case where we validly need to recover a missing
3248 : : * tablespace directory so that recovery can continue. This happens when
3249 : : * recovery wants to create a database but the holding tablespace has been
3250 : : * removed before the server stopped. Since we expect that the directory will
3251 : : * be gone before reaching recovery consistency, and we have no knowledge about
3252 : : * the tablespace other than its OID here, we create a real directory under
3253 : : * pg_tblspc here instead of restoring the symlink.
3254 : : *
3255 : : * If only_tblspc is true, then the requested directory must be in pg_tblspc/
3256 : : */
3257 : : static void
3258 : 0 : recovery_create_dbdir(char *path, bool only_tblspc)
3259 : : {
3260 : 0 : struct stat st;
3261 : :
3262 [ # # ]: 0 : Assert(RecoveryInProgress());
3263 : :
3264 [ # # ]: 0 : if (stat(path, &st) == 0)
3265 : 0 : return;
3266 : :
3267 [ # # # # ]: 0 : if (only_tblspc && strstr(path, PG_TBLSPC_DIR_SLASH) == NULL)
3268 [ # # # # ]: 0 : elog(PANIC, "requested to created invalid directory: %s", path);
3269 : :
3270 [ # # # # ]: 0 : if (reachedConsistency && !allow_in_place_tablespaces)
3271 [ # # # # ]: 0 : ereport(PANIC,
3272 : : errmsg("missing directory \"%s\"", path));
3273 : :
3274 [ # # # # : 0 : elog(reachedConsistency ? WARNING : DEBUG1,
# # # # #
# ]
3275 : : "creating missing directory: %s", path);
3276 : :
3277 [ # # ]: 0 : if (pg_mkdir_p(path, pg_dir_create_mode) != 0)
3278 [ # # # # ]: 0 : ereport(PANIC,
3279 : : errmsg("could not create missing directory \"%s\": %m", path));
3280 [ # # ]: 0 : }
3281 : :
3282 : :
3283 : : /*
3284 : : * DATABASE resource manager's routines
3285 : : */
3286 : : void
3287 : 0 : dbase_redo(XLogReaderState *record)
3288 : : {
3289 : 0 : uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
3290 : :
3291 : : /* Backup blocks are not used in dbase records */
3292 [ # # ]: 0 : Assert(!XLogRecHasAnyBlockRefs(record));
3293 : :
3294 [ # # ]: 0 : if (info == XLOG_DBASE_CREATE_FILE_COPY)
3295 : : {
3296 : 0 : xl_dbase_create_file_copy_rec *xlrec =
3297 : 0 : (xl_dbase_create_file_copy_rec *) XLogRecGetData(record);
3298 : 0 : char *src_path;
3299 : 0 : char *dst_path;
3300 : 0 : char *parent_path;
3301 : 0 : struct stat st;
3302 : :
3303 : 0 : src_path = GetDatabasePath(xlrec->src_db_id, xlrec->src_tablespace_id);
3304 : 0 : dst_path = GetDatabasePath(xlrec->db_id, xlrec->tablespace_id);
3305 : :
3306 : : /*
3307 : : * Our theory for replaying a CREATE is to forcibly drop the target
3308 : : * subdirectory if present, then re-copy the source data. This may be
3309 : : * more work than needed, but it is simple to implement.
3310 : : */
3311 [ # # # # ]: 0 : if (stat(dst_path, &st) == 0 && S_ISDIR(st.st_mode))
3312 : : {
3313 [ # # ]: 0 : if (!rmtree(dst_path, true))
3314 : : /* If this failed, copydir() below is going to error. */
3315 [ # # # # ]: 0 : ereport(WARNING,
3316 : : (errmsg("some useless files may be left behind in old database directory \"%s\"",
3317 : : dst_path)));
3318 : 0 : }
3319 : :
3320 : : /*
3321 : : * If the parent of the target path doesn't exist, create it now. This
3322 : : * enables us to create the target underneath later.
3323 : : */
3324 : 0 : parent_path = pstrdup(dst_path);
3325 : 0 : get_parent_directory(parent_path);
3326 [ # # ]: 0 : if (stat(parent_path, &st) < 0)
3327 : : {
3328 [ # # ]: 0 : if (errno != ENOENT)
3329 [ # # # # ]: 0 : ereport(FATAL,
3330 : : errmsg("could not stat directory \"%s\": %m",
3331 : : dst_path));
3332 : :
3333 : : /* create the parent directory if needed and valid */
3334 : 0 : recovery_create_dbdir(parent_path, true);
3335 : 0 : }
3336 : 0 : pfree(parent_path);
3337 : :
3338 : : /*
3339 : : * There's a case where the copy source directory is missing for the
3340 : : * same reason above. Create the empty source directory so that
3341 : : * copydir below doesn't fail. The directory will be dropped soon by
3342 : : * recovery.
3343 : : */
3344 [ # # # # ]: 0 : if (stat(src_path, &st) < 0 && errno == ENOENT)
3345 : 0 : recovery_create_dbdir(src_path, false);
3346 : :
3347 : : /*
3348 : : * Force dirty buffers out to disk, to ensure source database is
3349 : : * up-to-date for the copy.
3350 : : */
3351 : 0 : FlushDatabaseBuffers(xlrec->src_db_id);
3352 : :
3353 : : /* Close all smgr fds in all backends. */
3354 : 0 : WaitForProcSignalBarrier(EmitProcSignalBarrier(PROCSIGNAL_BARRIER_SMGRRELEASE));
3355 : :
3356 : : /*
3357 : : * Copy this subdirectory to the new location
3358 : : *
3359 : : * We don't need to copy subdirectories
3360 : : */
3361 : 0 : copydir(src_path, dst_path, false);
3362 : :
3363 : 0 : pfree(src_path);
3364 : 0 : pfree(dst_path);
3365 : 0 : }
3366 [ # # ]: 0 : else if (info == XLOG_DBASE_CREATE_WAL_LOG)
3367 : : {
3368 : 0 : xl_dbase_create_wal_log_rec *xlrec =
3369 : 0 : (xl_dbase_create_wal_log_rec *) XLogRecGetData(record);
3370 : 0 : char *dbpath;
3371 : 0 : char *parent_path;
3372 : :
3373 : 0 : dbpath = GetDatabasePath(xlrec->db_id, xlrec->tablespace_id);
3374 : :
3375 : : /* create the parent directory if needed and valid */
3376 : 0 : parent_path = pstrdup(dbpath);
3377 : 0 : get_parent_directory(parent_path);
3378 : 0 : recovery_create_dbdir(parent_path, true);
3379 : 0 : pfree(parent_path);
3380 : :
3381 : : /* Create the database directory with the version file. */
3382 : 0 : CreateDirAndVersionFile(dbpath, xlrec->db_id, xlrec->tablespace_id,
3383 : : true);
3384 : 0 : pfree(dbpath);
3385 : 0 : }
3386 [ # # ]: 0 : else if (info == XLOG_DBASE_DROP)
3387 : : {
3388 : 0 : xl_dbase_drop_rec *xlrec = (xl_dbase_drop_rec *) XLogRecGetData(record);
3389 : 0 : char *dst_path;
3390 : 0 : int i;
3391 : :
3392 [ # # ]: 0 : if (InHotStandby)
3393 : : {
3394 : : /*
3395 : : * Lock database while we resolve conflicts to ensure that
3396 : : * InitPostgres() cannot fully re-execute concurrently. This
3397 : : * avoids backends re-connecting automatically to same database,
3398 : : * which can happen in some cases.
3399 : : *
3400 : : * This will lock out walsenders trying to connect to db-specific
3401 : : * slots for logical decoding too, so it's safe for us to drop
3402 : : * slots.
3403 : : */
3404 : 0 : LockSharedObjectForSession(DatabaseRelationId, xlrec->db_id, 0, AccessExclusiveLock);
3405 : 0 : ResolveRecoveryConflictWithDatabase(xlrec->db_id);
3406 : 0 : }
3407 : :
3408 : : /* Drop any database-specific replication slots */
3409 : 0 : ReplicationSlotsDropDBSlots(xlrec->db_id);
3410 : :
3411 : : /* Drop pages for this database that are in the shared buffer cache */
3412 : 0 : DropDatabaseBuffers(xlrec->db_id);
3413 : :
3414 : : /* Also, clean out any fsync requests that might be pending in md.c */
3415 : 0 : ForgetDatabaseSyncRequests(xlrec->db_id);
3416 : :
3417 : : /* Clean out the xlog relcache too */
3418 : 0 : XLogDropDatabase(xlrec->db_id);
3419 : :
3420 : : /* Close all smgr fds in all backends. */
3421 : 0 : WaitForProcSignalBarrier(EmitProcSignalBarrier(PROCSIGNAL_BARRIER_SMGRRELEASE));
3422 : :
3423 [ # # ]: 0 : for (i = 0; i < xlrec->ntablespaces; i++)
3424 : : {
3425 : 0 : dst_path = GetDatabasePath(xlrec->db_id, xlrec->tablespace_ids[i]);
3426 : :
3427 : : /* And remove the physical files */
3428 [ # # ]: 0 : if (!rmtree(dst_path, true))
3429 [ # # # # ]: 0 : ereport(WARNING,
3430 : : (errmsg("some useless files may be left behind in old database directory \"%s\"",
3431 : : dst_path)));
3432 : 0 : pfree(dst_path);
3433 : 0 : }
3434 : :
3435 [ # # ]: 0 : if (InHotStandby)
3436 : : {
3437 : : /*
3438 : : * Release locks prior to commit. XXX There is a race condition
3439 : : * here that may allow backends to reconnect, but the window for
3440 : : * this is small because the gap between here and commit is mostly
3441 : : * fairly small and it is unlikely that people will be dropping
3442 : : * databases that we are trying to connect to anyway.
3443 : : */
3444 : 0 : UnlockSharedObjectForSession(DatabaseRelationId, xlrec->db_id, 0, AccessExclusiveLock);
3445 : 0 : }
3446 : 0 : }
3447 : : else
3448 [ # # # # ]: 0 : elog(PANIC, "dbase_redo: unknown op code %u", info);
3449 : 0 : }
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