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Fix several problems in pg_dump's handling of SQL/MED objects, notably failure

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to dump a PUBLIC user mapping correctly, as per bug #5560 from Shigeru Hanada.
Use the pg_user_mappings view rather than trying to access pg_user_mapping
directly, so that the code doesn't fail when run by a non-superuser.  And
clean up some minor carelessness such as unsafe usage of fmtId().

Back-patch to 8.4 where this code was added.
This commit is contained in:
Tom Lane 2010-07-14 21:21:23 +00:00
parent ba1dfcec96
commit 7fce4dc6cc
1 changed files with 27 additions and 17 deletions
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44
src/bin/pg_dump/pg_dump.c
View File

@ -12,7 +12,7 @@
* by PostgreSQL
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/bin/pg_dump/pg_dump.c,v 1.539.2.4 2010/03/03 20:10:42 heikki Exp $
* $PostgreSQL: pgsql/src/bin/pg_dump/pg_dump.c,v 1.539.2.5 2010/07/14 21:21:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -158,7 +158,7 @@ static void dumpTSTemplate(Archive *fout, TSTemplateInfo *tmplinfo);
static void dumpTSConfig(Archive *fout, TSConfigInfo *cfginfo);
static void dumpForeignDataWrapper(Archive *fout, FdwInfo *fdwinfo);
static void dumpForeignServer(Archive *fout, ForeignServerInfo *srvinfo);
static void dumpUserMappings(Archive *fout, const char *target,
static void dumpUserMappings(Archive *fout,
const char *servername, const char *namespace,
const char *owner, CatalogId catalogId, DumpId dumpId);
@ -9441,6 +9441,7 @@ dumpForeignServer(Archive *fout, ForeignServerInfo *srvinfo)
query = createPQExpBuffer();
/* look up the foreign-data wrapper */
selectSourceSchema("pg_catalog");
appendPQExpBuffer(query, "SELECT fdwname "
"FROM pg_foreign_data_wrapper w "
"WHERE w.oid = '%u'",
@ -9501,9 +9502,7 @@ dumpForeignServer(Archive *fout, ForeignServerInfo *srvinfo)
free(namecopy);
/* Dump user mappings */
resetPQExpBuffer(q);
appendPQExpBuffer(q, "SERVER %s", fmtId(srvinfo->dobj.name));
dumpUserMappings(fout, q->data,
dumpUserMappings(fout,
srvinfo->dobj.name, NULL,
srvinfo->rolname,
srvinfo->dobj.catId, srvinfo->dobj.dumpId);
@ -9520,7 +9519,7 @@ dumpForeignServer(Archive *fout, ForeignServerInfo *srvinfo)
* for the server.
*/
static void
dumpUserMappings(Archive *fout, const char *target,
dumpUserMappings(Archive *fout,
const char *servername, const char *namespace,
const char *owner,
CatalogId catalogId, DumpId dumpId)
@ -9531,7 +9530,7 @@ dumpUserMappings(Archive *fout, const char *target,
PQExpBuffer tag;
PGresult *res;
int ntups;
int i_umuser;
int i_usename;
int i_umoptions;
int i;
@ -9540,31 +9539,40 @@ dumpUserMappings(Archive *fout, const char *target,
delq = createPQExpBuffer();
query = createPQExpBuffer();
/*
* We read from the publicly accessible view pg_user_mappings, so as not
* to fail if run by a non-superuser. Note that the view will show
* umoptions as null if the user hasn't got privileges for the associated
* server; this means that pg_dump will dump such a mapping, but with no
* OPTIONS clause. A possible alternative is to skip such mappings
* altogether, but it's not clear that that's an improvement.
*/
selectSourceSchema("pg_catalog");
appendPQExpBuffer(query,
"SELECT (%s umuser) AS umuser, "
"SELECT usename, "
"array_to_string(ARRAY(SELECT option_name || ' ' || quote_literal(option_value) FROM pg_options_to_table(umoptions)), ', ') AS umoptions\n"
"FROM pg_user_mapping "
"WHERE umserver=%u",
username_subquery,
"FROM pg_user_mappings "
"WHERE srvid = %u",
catalogId.oid);
res = PQexec(g_conn, query->data);
check_sql_result(res, g_conn, query->data, PGRES_TUPLES_OK);
ntups = PQntuples(res);
i_umuser = PQfnumber(res, "umuser");
i_usename = PQfnumber(res, "usename");
i_umoptions = PQfnumber(res, "umoptions");
for (i = 0; i < ntups; i++)
{
char *umuser;
char *usename;
char *umoptions;
umuser = PQgetvalue(res, i, i_umuser);
usename = PQgetvalue(res, i, i_usename);
umoptions = PQgetvalue(res, i, i_umoptions);
resetPQExpBuffer(q);
appendPQExpBuffer(q, "CREATE USER MAPPING FOR %s", fmtId(umuser));
appendPQExpBuffer(q, "CREATE USER MAPPING FOR %s", fmtId(usename));
appendPQExpBuffer(q, " SERVER %s", fmtId(servername));
if (umoptions && strlen(umoptions) > 0)
@ -9573,10 +9581,12 @@ dumpUserMappings(Archive *fout, const char *target,
appendPQExpBuffer(q, ";\n");
resetPQExpBuffer(delq);
appendPQExpBuffer(delq, "DROP USER MAPPING FOR %s SERVER %s;\n", fmtId(umuser), fmtId(servername));
appendPQExpBuffer(delq, "DROP USER MAPPING FOR %s", fmtId(usename));
appendPQExpBuffer(delq, " SERVER %s;\n", fmtId(servername));
resetPQExpBuffer(tag);
appendPQExpBuffer(tag, "USER MAPPING %s %s", fmtId(umuser), target);
appendPQExpBuffer(tag, "USER MAPPING %s SERVER %s",
usename, servername);
ArchiveEntry(fout, nilCatalogId, createDumpId(),
tag->data,