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Commit0c7b9dc

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Have REASSIGN OWNED work on extensions, too
Per bug #6593, REASSIGN OWNED fails when the affected role has createdan extension. Even though the user related to the extension is notnominally the owner, its OID appears on pg_shdepend and thus causesproblems when the user is to be dropped.This commit adds code to change the "ownership" of the extension itself,not of the contained objects. This is fine because it's currently onlycalled from REASSIGN OWNED, which would also modify the ownership of thecontained objects. However, this is not sufficient for a working ALTEROWNER implementation extension.Back-patch to 9.1, where extensions were introduced.Bug #6593 reported by Emiliano Leporati.
1 parentb33385b commit0c7b9dc

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3 files changed

+99
-0
lines changed

3 files changed

+99
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lines changed

‎src/backend/catalog/pg_shdepend.c

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -25,6 +25,7 @@
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#include"catalog/pg_conversion.h"
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#include"catalog/pg_database.h"
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#include"catalog/pg_default_acl.h"
28+
#include"catalog/pg_extension.h"
2829
#include"catalog/pg_foreign_data_wrapper.h"
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#include"catalog/pg_foreign_server.h"
3031
#include"catalog/pg_language.h"
@@ -1392,6 +1393,10 @@ shdepReassignOwned(List *roleids, Oid newrole)
13921393
AlterForeignDataWrapperOwner_oid(sdepForm->objid,newrole);
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break;
13941395

1396+
caseExtensionRelationId:
1397+
AlterExtensionOwner_oid(sdepForm->objid,newrole);
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break;
1399+
13951400
default:
13961401
elog(ERROR,"unexpected classid %u",sdepForm->classid);
13971402
break;

‎src/backend/commands/extension.c

Lines changed: 92 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2724,3 +2724,95 @@ ExecAlterExtensionContentsStmt(AlterExtensionContentsStmt *stmt)
27242724
if (relation!=NULL)
27252725
relation_close(relation,NoLock);
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}
2727+
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/*
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* AlterExtensionOwner_internal
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*
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* Internal routine for changing the owner of an extension. rel must be
2732+
* pg_extension, already open and suitably locked; it will not be closed.
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*
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* Note that this only changes ownership of the extension itself; it doesn't
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* change the ownership of objects it contains. Since this function is
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* currently only called from REASSIGN OWNED, this restriction is okay because
2737+
* said objects would also be affected by our caller. But it's not enough for
2738+
* a full-fledged ALTER OWNER implementation, so beware.
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*/
2740+
staticvoid
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AlterExtensionOwner_internal(Relationrel,OidextensionOid,OidnewOwnerId)
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{
2743+
Form_pg_extensionextForm;
2744+
HeapTupletup;
2745+
SysScanDescscandesc;
2746+
ScanKeyDataentry[1];
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2748+
Assert(RelationGetRelid(rel)==ExtensionRelationId);
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2750+
ScanKeyInit(&entry[0],
2751+
ObjectIdAttributeNumber,
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BTEqualStrategyNumber,F_OIDEQ,
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ObjectIdGetDatum(extensionOid));
2754+
2755+
scandesc=systable_beginscan(rel,ExtensionOidIndexId, true,
2756+
SnapshotNow,1,entry);
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2758+
/* We assume that there can be at most one matching tuple */
2759+
tup=systable_getnext(scandesc);
2760+
if (!HeapTupleIsValid(tup))/* should not happen */
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elog(ERROR,"cache lookup failed for extension %u",extensionOid);
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2763+
tup=heap_copytuple(tup);
2764+
systable_endscan(scandesc);
2765+
2766+
extForm= (Form_pg_extension)GETSTRUCT(tup);
2767+
2768+
/*
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* If the new owner is the same as the existing owner, consider the
2770+
* command to have succeeded. This is for dump restoration purposes.
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*/
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if (extForm->extowner!=newOwnerId)
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{
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/* Superusers can always do it */
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if (!superuser())
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{
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/* Otherwise, must be owner of the existing object */
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if (!pg_extension_ownercheck(HeapTupleGetOid(tup),GetUserId()))
2779+
aclcheck_error(ACLCHECK_NOT_OWNER,ACL_KIND_EXTENSION,
2780+
NameStr(extForm->extname));
2781+
2782+
/* Must be able to become new owner */
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check_is_member_of_role(GetUserId(),newOwnerId);
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2785+
/* no privilege checks on namespace are required */
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}
2787+
2788+
/*
2789+
* Modify the owner --- okay to scribble on tup because it's a copy
2790+
*/
2791+
extForm->extowner=newOwnerId;
2792+
2793+
simple_heap_update(rel,&tup->t_self,tup);
2794+
2795+
CatalogUpdateIndexes(rel,tup);
2796+
2797+
/* Update owner dependency reference */
2798+
changeDependencyOnOwner(ExtensionRelationId,extensionOid,
2799+
newOwnerId);
2800+
}
2801+
2802+
heap_freetuple(tup);
2803+
}
2804+
2805+
/*
2806+
* Change extension owner, by OID
2807+
*/
2808+
void
2809+
AlterExtensionOwner_oid(OidextensionOid,OidnewOwnerId)
2810+
{
2811+
Relationrel;
2812+
2813+
rel=heap_open(ExtensionRelationId,RowExclusiveLock);
2814+
2815+
AlterExtensionOwner_internal(rel,extensionOid,newOwnerId);
2816+
2817+
heap_close(rel,NoLock);
2818+
}

‎src/include/commands/extension.h

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -45,4 +45,6 @@ extern char *get_extension_name(Oid ext_oid);
4545

4646
externvoidAlterExtensionNamespace(List*names,constchar*newschema);
4747

48+
externvoidAlterExtensionOwner_oid(OidextensionOid,OidnewOwnerId);
49+
4850
#endif/* EXTENSION_H */

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