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260 lines
7.3 KiB
C
260 lines
7.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* dbcommands.c--
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/parser/Attic/dbcommands.c,v 1.2 1996/11/08 05:57:31 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include <stdio.h>
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#include <signal.h>
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#include "postgres.h"
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#include "miscadmin.h" /* for DataDir */
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#include "access/heapam.h"
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#include "access/htup.h"
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#include "access/relscan.h"
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#include "utils/rel.h"
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#include "utils/elog.h"
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#include "catalog/catname.h"
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#include "catalog/pg_proc.h"
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#include "catalog/pg_user.h"
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#include "catalog/pg_database.h"
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#include "utils/syscache.h"
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#include "parser/dbcommands.h"
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#include "tcop/tcopprot.h"
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#include "storage/bufmgr.h"
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#include "storage/lmgr.h"
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/* non-export function prototypes */
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static void check_permissions(char *command, char *dbname,
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Oid *dbIdP, Oid *userIdP);
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static HeapTuple get_pg_dbtup(char *command, char *dbname, Relation dbrel);
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void
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createdb(char *dbname)
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{
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Oid db_id, user_id;
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char buf[512];
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/*
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* If this call returns, the database does not exist and we're allowed
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* to create databases.
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*/
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check_permissions("createdb", dbname, &db_id, &user_id);
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/* close virtual file descriptors so we can do system() calls */
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closeAllVfds();
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sprintf(buf, "mkdir %s%cbase%c%s", DataDir, SEP_CHAR, SEP_CHAR, dbname);
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system(buf);
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sprintf(buf, "%s %s%cbase%ctemplate1%c* %s%cbase%c%s",
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COPY_CMD, DataDir, SEP_CHAR, SEP_CHAR, SEP_CHAR, DataDir,
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SEP_CHAR, SEP_CHAR, dbname);
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system(buf);
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/* sprintf(buf, "insert into pg_database (datname, datdba, datpath) \
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values (\'%s\'::char16, \'%d\'::oid, \'%s\'::text);",
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dbname, user_id, dbname);
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*/
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sprintf(buf, "insert into pg_database (datname, datdba, datpath) \
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values (\'%s\', \'%d\', \'%s\');",
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dbname, user_id, dbname);
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pg_eval(buf, (char **) NULL, (Oid *) NULL, 0);
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}
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void
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destroydb(char *dbname)
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{
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Oid user_id, db_id;
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char buf[512];
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/*
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* If this call returns, the database exists and we're allowed to
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* remove it.
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*/
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check_permissions("destroydb", dbname, &db_id, &user_id);
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if (!OidIsValid(db_id)) {
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elog(FATAL, "impossible: pg_database instance with invalid OID.");
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}
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/* stop the vacuum daemon */
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stop_vacuum(dbname);
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/* remove the pg_database tuple FIRST,
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this may fail due to permissions problems*/
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sprintf(buf, "delete from pg_database where pg_database.oid = \'%d\'::oid",
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db_id);
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pg_eval(buf, (char **) NULL, (Oid *) NULL, 0);
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/* remove the data directory. If the DELETE above failed, this will
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not be reached */
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sprintf(buf, "rm -r %s/base/%s", DataDir, dbname);
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system(buf);
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/* drop pages for this database that are in the shared buffer cache */
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DropBuffers(db_id);
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}
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static HeapTuple
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get_pg_dbtup(char *command, char *dbname, Relation dbrel)
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{
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HeapTuple dbtup;
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HeapTuple tup;
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Buffer buf;
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HeapScanDesc scan;
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ScanKeyData scanKey;
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ScanKeyEntryInitialize(&scanKey, 0, Anum_pg_database_datname,
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NameEqualRegProcedure, NameGetDatum(dbname));
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scan = heap_beginscan(dbrel, 0, NowTimeQual, 1, &scanKey);
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if (!HeapScanIsValid(scan))
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elog(WARN, "%s: cannot begin scan of pg_database.", command);
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/*
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* since we want to return the tuple out of this proc, and we're
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* going to close the relation, copy the tuple and return the copy.
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*/
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tup = heap_getnext(scan, 0, &buf);
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if (HeapTupleIsValid(tup)) {
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dbtup = heap_copytuple(tup);
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ReleaseBuffer(buf);
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} else
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dbtup = tup;
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heap_endscan(scan);
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return (dbtup);
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}
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/*
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* check_permissions() -- verify that the user is permitted to do this.
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*
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* If the user is not allowed to carry out this operation, this routine
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* elog(WARN, ...)s, which will abort the xact. As a side effect, the
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* user's pg_user tuple OID is returned in userIdP and the target database's
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* OID is returned in dbIdP.
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*/
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static void
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check_permissions(char *command,
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char *dbname,
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Oid *dbIdP,
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Oid *userIdP)
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{
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Relation dbrel;
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HeapTuple dbtup, utup;
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Oid dbowner = (Oid)0;
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char use_createdb;
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bool dbfound;
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bool use_super;
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char *userName;
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userName = GetPgUserName();
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utup = SearchSysCacheTuple(USENAME, PointerGetDatum(userName),
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0,0,0);
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*userIdP = ((Form_pg_user)GETSTRUCT(utup))->usesysid;
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use_super = ((Form_pg_user)GETSTRUCT(utup))->usesuper;
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use_createdb = ((Form_pg_user)GETSTRUCT(utup))->usecreatedb;
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/* Check to make sure user has permission to use createdb */
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if (!use_createdb) {
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elog(WARN, "user \"%-.*s\" is not allowed to create/destroy databases",
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NAMEDATALEN, userName);
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}
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/* Make sure we are not mucking with the template database */
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if (!strcmp(dbname, "template1")) {
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elog(WARN, "%s cannot be executed on the template database.", command);
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}
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/* Check to make sure database is not the currently open database */
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if (!strcmp(dbname, GetDatabaseName())) {
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elog(WARN, "%s cannot be executed on an open database", command);
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}
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/* Check to make sure database is owned by this user */
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/*
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* need the reldesc to get the database owner out of dbtup
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* and to set a write lock on it.
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*/
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dbrel = heap_openr(DatabaseRelationName);
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if (!RelationIsValid(dbrel))
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elog(FATAL, "%s: cannot open relation \"%-.*s\"",
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command, DatabaseRelationName);
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/*
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* Acquire a write lock on pg_database from the beginning to avoid
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* upgrading a read lock to a write lock. Upgrading causes long delays
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* when multiple 'createdb's or 'destroydb's are run simult. -mer 7/3/91
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*/
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RelationSetLockForWrite(dbrel);
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dbtup = get_pg_dbtup(command, dbname, dbrel);
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dbfound = HeapTupleIsValid(dbtup);
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if (dbfound) {
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dbowner = (Oid) heap_getattr(dbtup, InvalidBuffer,
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Anum_pg_database_datdba,
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RelationGetTupleDescriptor(dbrel),
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(char *) NULL);
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*dbIdP = dbtup->t_oid;
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} else {
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*dbIdP = InvalidOid;
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}
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heap_close(dbrel);
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/*
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* Now be sure that the user is allowed to do this.
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*/
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if (dbfound && !strcmp(command, "createdb")) {
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elog(WARN, "createdb: database %s already exists.", dbname);
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} else if (!dbfound && !strcmp(command, "destroydb")) {
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elog(WARN, "destroydb: database %s does not exist.", dbname);
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} else if (dbfound && !strcmp(command, "destroydb")
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&& dbowner != *userIdP && use_super == false) {
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elog(WARN, "%s: database %s is not owned by you.", command, dbname);
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}
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}
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/*
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* stop_vacuum() -- stop the vacuum daemon on the database, if one is
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* running.
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*/
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void
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stop_vacuum(char *dbname)
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{
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char filename[256];
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FILE *fp;
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int pid;
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sprintf(filename, "%s%cbase%c%s%c%s.vacuum", DataDir, SEP_CHAR, SEP_CHAR,
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dbname, SEP_CHAR, dbname);
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if ((fp = fopen(filename, "r")) != (FILE *) NULL) {
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fscanf(fp, "%d", &pid);
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fclose(fp);
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if (kill(pid, SIGKILLDAEMON1) < 0) {
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elog(WARN, "can't kill vacuum daemon (pid %d) on %s",
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pid, dbname);
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}
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}
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}
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