/*
* AlterConversionOwner_internal
*
* Internal routine for changing the owner. rel must be pg_conversion, already
* open and suitably locked; it will not be closed.
*/
static void
AlterConversionOwner_internal(Relation rel, Oid conversionOid, Oid newOwnerId)
{
Form_pg_conversion convForm;
HeapTuple tup;
Assert(RelationGetRelid(rel) == ConversionRelationId);
tup = SearchSysCacheCopy(CONOID,
ObjectIdGetDatum(conversionOid),
0, 0, 0);
if (!HeapTupleIsValid(tup)) /* should not happen */
elog(ERROR, "cache lookup failed for conversion %u", conversionOid);
convForm = (Form_pg_conversion) GETSTRUCT(tup);
/*
* If the new owner is the same as the existing owner, consider the
* command to have succeeded. This is for dump restoration purposes.
*/
if (convForm->conowner != newOwnerId)
{
AclResult aclresult;
/* Superusers can always do it */
if (!superuser())
{
/* Otherwise, must be owner of the existing object */
if (!pg_conversion_ownercheck(HeapTupleGetOid(tup), GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CONVERSION,
NameStr(convForm->conname));
/* Must be able to become new owner */
check_is_member_of_role(GetUserId(), newOwnerId);
/* New owner must have CREATE privilege on namespace */
aclresult = pg_namespace_aclcheck(convForm->connamespace,
newOwnerId,
ACL_CREATE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
get_namespace_name(convForm->connamespace));
}
/*
* Modify the owner --- okay to scribble on tup because it's a copy
*/
convForm->conowner = newOwnerId;
simple_heap_update(rel, &tup->t_self, tup);
CatalogUpdateIndexes(rel, tup);
/* Update owner dependency reference */
changeDependencyOnOwner(ConversionRelationId, conversionOid,
newOwnerId);
}
heap_freetuple(tup);
}
/*
* CREATE SCHEMA
*/
Oid
CreateSchemaCommand(CreateSchemaStmt *stmt, const char *queryString)
{
const char *schemaName = stmt->schemaname;
Oid namespaceId;
OverrideSearchPath *overridePath;
List *parsetree_list;
ListCell *parsetree_item;
Oid owner_uid;
Oid saved_uid;
int save_sec_context;
AclResult aclresult;
ObjectAddress address;
GetUserIdAndSecContext(&saved_uid, &save_sec_context);
/*
* Who is supposed to own the new schema?
*/
if (stmt->authrole)
owner_uid = get_rolespec_oid(stmt->authrole, false);
else
owner_uid = saved_uid;
/* fill schema name with the user name if not specified */
if (!schemaName)
{
HeapTuple tuple;
tuple = SearchSysCache1(AUTHOID, ObjectIdGetDatum(owner_uid));
if (!HeapTupleIsValid(tuple))
elog(ERROR, "cache lookup failed for role %u", owner_uid);
schemaName =
pstrdup(NameStr(((Form_pg_authid) GETSTRUCT(tuple))->rolname));
ReleaseSysCache(tuple);
}
/*
* To create a schema, must have schema-create privilege on the current
* database and must be able to become the target role (this does not
* imply that the target role itself must have create-schema privilege).
* The latter provision guards against "giveaway" attacks. Note that a
* superuser will always have both of these privileges a fortiori.
*/
aclresult = pg_database_aclcheck(MyDatabaseId, saved_uid, ACL_CREATE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_DATABASE,
get_database_name(MyDatabaseId));
check_is_member_of_role(saved_uid, owner_uid);
/* Additional check to protect reserved schema names */
if (!allowSystemTableMods && IsReservedName(schemaName))
ereport(ERROR,
(errcode(ERRCODE_RESERVED_NAME),
errmsg("unacceptable schema name \"%s\"", schemaName),
errdetail("The prefix \"pg_\" is reserved for system schemas.")));
/*
* If if_not_exists was given and the schema already exists, bail out.
* (Note: we needn't check this when not if_not_exists, because
* NamespaceCreate will complain anyway.) We could do this before making
* the permissions checks, but since CREATE TABLE IF NOT EXISTS makes its
* creation-permission check first, we do likewise.
*/
if (stmt->if_not_exists &&
SearchSysCacheExists1(NAMESPACENAME, PointerGetDatum(schemaName)))
{
ereport(NOTICE,
(errcode(ERRCODE_DUPLICATE_SCHEMA),
errmsg("schema \"%s\" already exists, skipping",
schemaName)));
return InvalidOid;
}
/*
* If the requested authorization is different from the current user,
* temporarily set the current user so that the object(s) will be created
* with the correct ownership.
*
* (The setting will be restored at the end of this routine, or in case of
* error, transaction abort will clean things up.)
*/
if (saved_uid != owner_uid)
SetUserIdAndSecContext(owner_uid,
save_sec_context | SECURITY_LOCAL_USERID_CHANGE);
/* Create the schema's namespace */
namespaceId = NamespaceCreate(schemaName, owner_uid, false);
/* Advance cmd counter to make the namespace visible */
CommandCounterIncrement();
/*
* Temporarily make the new namespace be the front of the search path, as
* well as the default creation target namespace. This will be undone at
* the end of this routine, or upon error.
*/
overridePath = GetOverrideSearchPath(CurrentMemoryContext);
overridePath->schemas = lcons_oid(namespaceId, overridePath->schemas);
/* XXX should we clear overridePath->useTemp? */
PushOverrideSearchPath(overridePath);
/*
* Report the new schema to possibly interested event triggers. Note we
* must do this here and not in ProcessUtilitySlow because otherwise the
* objects created below are reported before the schema, which would be
* wrong.
*/
ObjectAddressSet(address, NamespaceRelationId, namespaceId);
EventTriggerCollectSimpleCommand(address, InvalidObjectAddress,
(Node *) stmt);
/*
* Examine the list of commands embedded in the CREATE SCHEMA command, and
* reorganize them into a sequentially executable order with no forward
* references. Note that the result is still a list of raw parsetrees ---
* we cannot, in general, run parse analysis on one statement until we
* have actually executed the prior ones.
*/
parsetree_list = transformCreateSchemaStmt(stmt);
/*
* Execute each command contained in the CREATE SCHEMA. Since the grammar
* allows only utility commands in CREATE SCHEMA, there is no need to pass
* them through parse_analyze() or the rewriter; we can just hand them
* straight to ProcessUtility.
*/
foreach(parsetree_item, parsetree_list)
{
Node *stmt = (Node *) lfirst(parsetree_item);
/* do this step */
ProcessUtility(stmt,
queryString,
PROCESS_UTILITY_SUBCOMMAND,
NULL,
None_Receiver,
NULL);
/* make sure later steps can see the object created here */
CommandCounterIncrement();
}
/*
* Workhorse for AlterLanguageOwner variants
*/
static void
AlterLanguageOwner_internal(HeapTuple tup, Relation rel, Oid newOwnerId)
{
Form_pg_language lanForm;
lanForm = (Form_pg_language) GETSTRUCT(tup);
/*
* If the new owner is the same as the existing owner, consider the
* command to have succeeded. This is for dump restoration purposes.
*/
if (lanForm->lanowner != newOwnerId)
{
Datum repl_val[Natts_pg_language];
bool repl_null[Natts_pg_language];
bool repl_repl[Natts_pg_language];
Acl *newAcl;
Datum aclDatum;
bool isNull;
HeapTuple newtuple;
/* Otherwise, must be owner of the existing object */
if (!pg_language_ownercheck(HeapTupleGetOid(tup), GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_LANGUAGE,
NameStr(lanForm->lanname));
/* Must be able to become new owner */
check_is_member_of_role(GetUserId(), newOwnerId);
memset(repl_null, false, sizeof(repl_null));
memset(repl_repl, false, sizeof(repl_repl));
repl_repl[Anum_pg_language_lanowner - 1] = true;
repl_val[Anum_pg_language_lanowner - 1] = ObjectIdGetDatum(newOwnerId);
/*
* Determine the modified ACL for the new owner. This is only
* necessary when the ACL is non-null.
*/
aclDatum = SysCacheGetAttr(LANGNAME, tup,
Anum_pg_language_lanacl,
&isNull);
if (!isNull)
{
newAcl = aclnewowner(DatumGetAclP(aclDatum),
lanForm->lanowner, newOwnerId);
repl_repl[Anum_pg_language_lanacl - 1] = true;
repl_val[Anum_pg_language_lanacl - 1] = PointerGetDatum(newAcl);
}
newtuple = heap_modify_tuple(tup, RelationGetDescr(rel),
repl_val, repl_null, repl_repl);
simple_heap_update(rel, &newtuple->t_self, newtuple);
CatalogUpdateIndexes(rel, newtuple);
heap_freetuple(newtuple);
/* Update owner dependency reference */
changeDependencyOnOwner(LanguageRelationId, HeapTupleGetOid(tup),
newOwnerId);
}
}
/*
* CREATE SCHEMA
*/
void
CreateSchemaCommand(CreateSchemaStmt *stmt, const char *queryString)
{
const char *schemaName = stmt->schemaname;
const char *authId = stmt->authid;
const bool istemp = stmt->istemp;
Oid namespaceId = 0;
List *parsetree_list;
ListCell *parsetree_item;
Oid owner_uid;
Oid saved_uid;
AclResult aclresult;
bool saved_secdefcxt;
/* bool shouldDispatch = (Gp_role == GP_ROLE_DISPATCH &&
!IsBootstrapProcessingMode());*/
GetUserIdAndContext(&saved_uid, &saved_secdefcxt);
/*
* Who is supposed to own the new schema?
*/
if (authId)
owner_uid = get_roleid_checked(authId);
else
owner_uid = saved_uid;
/*
* If we are creating a temporary schema then we can skip a
* bunch of checks that we would otherwise make.
*/
if (istemp)
{
/*
* CDB: Delete old temp schema.
*
* Remove any vestigages of old temporary schema, if any. This can
* happen when an old session crashes and doesn't run normal session
* shutdown.
*
* In postgres they try to reuse existing schemas in this case,
* however that does not work well for us since the schemas may exist
* on a segment by segment basis and we want to keep them syncronized
* on oid. The best way of dealing with this is to just delete the
* old schemas.
*/
RemoveSchema_internal(schemaName, DROP_CASCADE, true, true);
}
else
{
/*
* To create a schema, must have schema-create privilege on the current
* database and must be able to become the target role (this does not
* imply that the target role itself must have create-schema privilege).
* The latter provision guards against "giveaway" attacks. Note that a
* superuser will always have both of these privileges a fortiori.
*/
aclresult = pg_database_aclcheck(MyDatabaseId, saved_uid, ACL_CREATE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_DATABASE,
get_database_name(MyDatabaseId));
check_is_member_of_role(saved_uid, owner_uid);
/* Additional check to protect reserved schema names */
if (!allowSystemTableModsDDL &&
(IsReservedName(schemaName) || strcmp(schemaName, "madlib") == 0))
{
ereport(ERROR,
(errcode(ERRCODE_RESERVED_NAME),
errmsg("unacceptable schema name \"%s\"", schemaName),
errdetail("The prefix \"%s\" is reserved for system schemas.",
GetReservedPrefix(schemaName))));
}
}
/*
* If the requested authorization is different from the current user,
* temporarily set the current user so that the object(s) will be created
* with the correct ownership.
*
* (The setting will be restored at the end of this routine, or in case
* of error, transaction abort will clean things up.)
*/
if (saved_uid != owner_uid)
SetUserIdAndContext(owner_uid, true);
/*
* in hawq, should be only called on master except
* UPGRADE model.
*/
Assert(gp_upgrade_mode || (Gp_role != GP_ROLE_EXECUTE));
/* Create the schema's namespace */
namespaceId = NamespaceCreate(schemaName, owner_uid, 0);
/* MPP-6929: metadata tracking */
if (Gp_role == GP_ROLE_DISPATCH && !istemp)
MetaTrackAddObject(NamespaceRelationId,
namespaceId,
saved_uid,
"CREATE", "SCHEMA"
);
/* Advance cmd counter to make the namespace visible */
CommandCounterIncrement();
/* If this is the temporary namespace we must mark it specially */
if (istemp)
SetTempNamespace(namespaceId);
/*
* Temporarily make the new namespace be the front of the search path, as
* well as the default creation target namespace. This will be undone at
* the end of this routine, or upon error.
*/
PushSpecialNamespace(namespaceId);
/*
* Examine the list of commands embedded in the CREATE SCHEMA command, and
* reorganize them into a sequentially executable order with no forward
* references. Note that the result is still a list of raw parsetrees in
* need of parse analysis --- we cannot, in general, run analyze.c on one
* statement until we have actually executed the prior ones.
*/
parsetree_list = analyzeCreateSchemaStmt(stmt);
/*
* Analyze and execute each command contained in the CREATE SCHEMA
*/
foreach(parsetree_item, parsetree_list)
{
Node *parsetree = (Node *) lfirst(parsetree_item);
List *querytree_list;
ListCell *querytree_item;
querytree_list = parse_analyze(parsetree, NULL, NULL, 0);
foreach(querytree_item, querytree_list)
{
Query *querytree = (Query *) lfirst(querytree_item);
/* schemas should contain only utility stmts */
Assert(querytree->commandType == CMD_UTILITY);
/* do this step */
ProcessUtility(querytree->utilityStmt,
queryString,
NULL,
false, /* not top level */
None_Receiver,
NULL);
/* make sure later steps can see the object created here */
CommandCounterIncrement();
}
CreateSchemaCommand(CreateSchemaStmt *stmt, const char *queryString)
#endif
{
const char *schemaName = stmt->schemaname;
const char *authId = stmt->authid;
Oid namespaceId;
OverrideSearchPath *overridePath;
List *parsetree_list;
ListCell *parsetree_item;
Oid owner_uid;
Oid saved_uid;
int save_sec_context;
AclResult aclresult;
GetUserIdAndSecContext(&saved_uid, &save_sec_context);
/*
* Who is supposed to own the new schema?
*/
if (authId)
owner_uid = get_role_oid(authId, false);
else
owner_uid = saved_uid;
/*
* To create a schema, must have schema-create privilege on the current
* database and must be able to become the target role (this does not
* imply that the target role itself must have create-schema privilege).
* The latter provision guards against "giveaway" attacks. Note that a
* superuser will always have both of these privileges a fortiori.
*/
aclresult = pg_database_aclcheck(MyDatabaseId, saved_uid, ACL_CREATE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_DATABASE,
get_database_name(MyDatabaseId));
check_is_member_of_role(saved_uid, owner_uid);
/* Additional check to protect reserved schema names */
if (!allowSystemTableMods && IsReservedName(schemaName))
ereport(ERROR,
(errcode(ERRCODE_RESERVED_NAME),
errmsg("unacceptable schema name \"%s\"", schemaName),
errdetail("The prefix \"pg_\" is reserved for system schemas.")));
/*
* If the requested authorization is different from the current user,
* temporarily set the current user so that the object(s) will be created
* with the correct ownership.
*
* (The setting will be restored at the end of this routine, or in case of
* error, transaction abort will clean things up.)
*/
if (saved_uid != owner_uid)
SetUserIdAndSecContext(owner_uid,
save_sec_context | SECURITY_LOCAL_USERID_CHANGE);
/* Create the schema's namespace */
namespaceId = NamespaceCreate(schemaName, owner_uid, false);
/* Advance cmd counter to make the namespace visible */
CommandCounterIncrement();
/*
* Temporarily make the new namespace be the front of the search path, as
* well as the default creation target namespace. This will be undone at
* the end of this routine, or upon error.
*/
overridePath = GetOverrideSearchPath(CurrentMemoryContext);
overridePath->schemas = lcons_oid(namespaceId, overridePath->schemas);
/* XXX should we clear overridePath->useTemp? */
PushOverrideSearchPath(overridePath);
/*
* Examine the list of commands embedded in the CREATE SCHEMA command, and
* reorganize them into a sequentially executable order with no forward
* references. Note that the result is still a list of raw parsetrees ---
* we cannot, in general, run parse analysis on one statement until we
* have actually executed the prior ones.
*/
parsetree_list = transformCreateSchemaStmt(stmt);
#ifdef PGXC
/*
* Add a RemoteQuery node for a query at top level on a remote Coordinator,
* if not done already.
*/
if (!sentToRemote)
parsetree_list = AddRemoteQueryNode(parsetree_list, queryString,
EXEC_ON_ALL_NODES, false);
#endif
/*
* Execute each command contained in the CREATE SCHEMA. Since the grammar
* allows only utility commands in CREATE SCHEMA, there is no need to pass
* them through parse_analyze() or the rewriter; we can just hand them
* straight to ProcessUtility.
*/
foreach(parsetree_item, parsetree_list)
{
Node *stmt = (Node *) lfirst(parsetree_item);
/* do this step */
ProcessUtility(stmt,
queryString,
NULL,
false, /* not top level */
None_Receiver,
#ifdef PGXC
true,
#endif /* PGXC */
NULL);
/* make sure later steps can see the object created here */
CommandCounterIncrement();
}
/*
* CREATE SCHEMA
*/
void
CreateSchemaCommand(CreateSchemaStmt *stmt, const char *queryString)
{
const char *schemaName = stmt->schemaname;
const char *authId = stmt->authid;
Oid namespaceId;
OverrideSearchPath *overridePath;
List *parsetree_list;
ListCell *parsetree_item;
Oid owner_uid;
Oid saved_uid;
int save_sec_context;
AclResult aclresult;
bool shouldDispatch = (Gp_role == GP_ROLE_DISPATCH &&
!IsBootstrapProcessingMode());
/*
* GPDB: Creation of temporary namespaces is a special case. This statement
* is dispatched by the dispatcher node the first time a temporary table is
* created. It bypasses all the normal checks and logic of schema creation,
* and is routed to the internal routine for creating temporary namespaces,
* instead.
*/
if (stmt->istemp)
{
Assert(Gp_role == GP_ROLE_EXECUTE);
Assert(stmt->schemaname == InvalidOid);
Assert(stmt->authid == NULL);
Assert(stmt->schemaElts == NIL);
Assert(stmt->schemaOid != InvalidOid);
Assert(stmt->toastSchemaOid != InvalidOid);
InitTempTableNamespaceWithOids(stmt->schemaOid,
stmt->toastSchemaOid);
return;
}
GetUserIdAndSecContext(&saved_uid, &save_sec_context);
/*
* Who is supposed to own the new schema?
*/
if (authId)
owner_uid = get_roleid_checked(authId);
else
owner_uid = saved_uid;
/*
* To create a schema, must have schema-create privilege on the current
* database and must be able to become the target role (this does not
* imply that the target role itself must have create-schema privilege).
* The latter provision guards against "giveaway" attacks. Note that a
* superuser will always have both of these privileges a fortiori.
*/
aclresult = pg_database_aclcheck(MyDatabaseId, saved_uid, ACL_CREATE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_DATABASE,
get_database_name(MyDatabaseId));
check_is_member_of_role(saved_uid, owner_uid);
/* Additional check to protect reserved schema names */
if (!allowSystemTableModsDDL && IsReservedName(schemaName))
{
ereport(ERROR,
(errcode(ERRCODE_RESERVED_NAME),
errmsg("unacceptable schema name \"%s\"", schemaName),
errdetail("The prefix \"%s\" is reserved for system schemas.",
GetReservedPrefix(schemaName))));
}
/*
* If the requested authorization is different from the current user,
* temporarily set the current user so that the object(s) will be created
* with the correct ownership.
*
* (The setting will be restored at the end of this routine, or in case
* of error, transaction abort will clean things up.)
*/
if (saved_uid != owner_uid)
SetUserIdAndSecContext(owner_uid,
save_sec_context | SECURITY_LOCAL_USERID_CHANGE);
/* Create the schema's namespace */
if (shouldDispatch || Gp_role != GP_ROLE_EXECUTE)
{
namespaceId = NamespaceCreate(schemaName, owner_uid, 0);
if (shouldDispatch)
{
elog(DEBUG5, "shouldDispatch = true, namespaceOid = %d", namespaceId);
Assert(stmt->schemaOid == 0);
stmt->schemaOid = namespaceId;
/*
* Dispatch the command to all primary and mirror segment dbs.
* Starts a global transaction and reconfigures cluster if needed.
* Waits for QEs to finish. Exits via ereport(ERROR,...) if error.
*/
CdbDispatchUtilityStatement((Node *) stmt,
DF_CANCEL_ON_ERROR |
DF_WITH_SNAPSHOT |
DF_NEED_TWO_PHASE,
NULL);
}
/* MPP-6929: metadata tracking */
if (Gp_role == GP_ROLE_DISPATCH)
MetaTrackAddObject(NamespaceRelationId,
namespaceId,
saved_uid,
"CREATE", "SCHEMA"
);
}
else
{
namespaceId = NamespaceCreate(schemaName, owner_uid, stmt->schemaOid);
}
/* Advance cmd counter to make the namespace visible */
CommandCounterIncrement();
/*
* Temporarily make the new namespace be the front of the search path, as
* well as the default creation target namespace. This will be undone at
* the end of this routine, or upon error.
*/
overridePath = GetOverrideSearchPath(CurrentMemoryContext);
overridePath->schemas = lcons_oid(namespaceId, overridePath->schemas);
/* XXX should we clear overridePath->useTemp? */
PushOverrideSearchPath(overridePath);
/*
* Examine the list of commands embedded in the CREATE SCHEMA command, and
* reorganize them into a sequentially executable order with no forward
* references. Note that the result is still a list of raw parsetrees ---
* we cannot, in general, run parse analysis on one statement until we
* have actually executed the prior ones.
*/
parsetree_list = transformCreateSchemaStmt(stmt);
/*
* Execute each command contained in the CREATE SCHEMA. Since the grammar
* allows only utility commands in CREATE SCHEMA, there is no need to pass
* them through parse_analyze() or the rewriter; we can just hand them
* straight to ProcessUtility.
*/
foreach(parsetree_item, parsetree_list)
{
Node *stmt = (Node *) lfirst(parsetree_item);
/* do this step */
ProcessUtility(stmt,
queryString,
NULL,
false, /* not top level */
None_Receiver,
NULL);
/* make sure later steps can see the object created here */
CommandCounterIncrement();
}
/*
* AlterConversionOwner_internal
*
* Internal routine for changing the owner. rel must be pg_conversion, already
* open and suitably locked; it will not be closed.
*/
static void
AlterConversionOwner_internal(Relation rel, Oid conversionOid, Oid newOwnerId)
{
Form_pg_conversion convForm;
HeapTuple tup;
cqContext cqc;
cqContext *pcqCtx;
Assert(RelationGetRelid(rel) == ConversionRelationId);
pcqCtx = caql_addrel(cqclr(&cqc), rel);
tup = caql_getfirst(
pcqCtx,
cql("SELECT * FROM pg_conversion "
" WHERE oid = :1 "
" FOR UPDATE ",
ObjectIdGetDatum(conversionOid)));
if (!HeapTupleIsValid(tup)) /* should not happen */
elog(ERROR, "cache lookup failed for conversion %u", conversionOid);
convForm = (Form_pg_conversion) GETSTRUCT(tup);
/*
* If the new owner is the same as the existing owner, consider the
* command to have succeeded. This is for dump restoration purposes.
*/
if (convForm->conowner == newOwnerId)
{
heap_freetuple(tup);
return;
}
AclResult aclresult;
/* Superusers can always do it */
if (!superuser())
{
/* Otherwise, must be owner of the existing object */
if (!pg_conversion_ownercheck(HeapTupleGetOid(tup), GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CONVERSION,
NameStr(convForm->conname));
/* Must be able to become new owner */
check_is_member_of_role(GetUserId(), newOwnerId);
/* New owner must have CREATE privilege on namespace */
aclresult = pg_namespace_aclcheck(convForm->connamespace,
newOwnerId,
ACL_CREATE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
get_namespace_name(convForm->connamespace));
}
/*
* Modify the owner --- okay to scribble on tup because it's a copy
*/
convForm->conowner = newOwnerId;
caql_update_current(pcqCtx, tup); /* implicit update of index as well */
/* Update owner dependency reference */
changeDependencyOnOwner(ConversionRelationId, conversionOid,
newOwnerId);
heap_freetuple(tup);
}
/*
* Change tablespace owner
*/
void
AlterTableSpaceOwner(const char *name, Oid newOwnerId)
{
Relation rel;
ScanKeyData entry[1];
HeapScanDesc scandesc;
Form_pg_tablespace spcForm;
HeapTuple tup;
/* Search pg_tablespace */
rel = heap_open(TableSpaceRelationId, RowExclusiveLock);
ScanKeyInit(&entry[0],
Anum_pg_tablespace_spcname,
BTEqualStrategyNumber, F_NAMEEQ,
CStringGetDatum(name));
scandesc = heap_beginscan(rel, SnapshotNow, 1, entry);
tup = heap_getnext(scandesc, ForwardScanDirection);
if (!HeapTupleIsValid(tup))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("tablespace \"%s\" does not exist", name)));
spcForm = (Form_pg_tablespace) GETSTRUCT(tup);
/*
* If the new owner is the same as the existing owner, consider the
* command to have succeeded. This is for dump restoration purposes.
*/
if (spcForm->spcowner != newOwnerId)
{
Datum repl_val[Natts_pg_tablespace];
bool repl_null[Natts_pg_tablespace];
bool repl_repl[Natts_pg_tablespace];
Acl *newAcl;
Datum aclDatum;
bool isNull;
HeapTuple newtuple;
/* Otherwise, must be owner of the existing object */
if (!pg_tablespace_ownercheck(HeapTupleGetOid(tup), GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_TABLESPACE,
name);
/* Must be able to become new owner */
check_is_member_of_role(GetUserId(), newOwnerId);
/*
* Normally we would also check for create permissions here, but there
* are none for tablespaces so we follow what rename tablespace does
* and omit the create permissions check.
*
* NOTE: Only superusers may create tablespaces to begin with and so
* initially only a superuser would be able to change its ownership
* anyway.
*/
memset(repl_null, false, sizeof(repl_null));
memset(repl_repl, false, sizeof(repl_repl));
repl_repl[Anum_pg_tablespace_spcowner - 1] = true;
repl_val[Anum_pg_tablespace_spcowner - 1] = ObjectIdGetDatum(newOwnerId);
/*
* Determine the modified ACL for the new owner. This is only
* necessary when the ACL is non-null.
*/
aclDatum = heap_getattr(tup,
Anum_pg_tablespace_spcacl,
RelationGetDescr(rel),
&isNull);
if (!isNull)
{
newAcl = aclnewowner(DatumGetAclP(aclDatum),
spcForm->spcowner, newOwnerId);
repl_repl[Anum_pg_tablespace_spcacl - 1] = true;
repl_val[Anum_pg_tablespace_spcacl - 1] = PointerGetDatum(newAcl);
}
newtuple = heap_modify_tuple(tup, RelationGetDescr(rel), repl_val, repl_null, repl_repl);
simple_heap_update(rel, &newtuple->t_self, newtuple);
CatalogUpdateIndexes(rel, newtuple);
heap_freetuple(newtuple);
/* Update owner dependency reference */
changeDependencyOnOwner(TableSpaceRelationId, HeapTupleGetOid(tup),
newOwnerId);
}
heap_endscan(scandesc);
heap_close(rel, NoLock);
}
/*
* Change tablespace owner
*/
void
AlterTableSpaceOwner(const char *name, Oid newOwnerId)
{
Relation rel;
Oid tablespaceoid;
cqContext cqc;
cqContext *pcqCtx;
Form_pg_tablespace spcForm;
HeapTuple tup;
/* Search pg_tablespace */
rel = heap_open(TableSpaceRelationId, RowExclusiveLock);
pcqCtx = caql_addrel(cqclr(&cqc), rel);
tup = caql_getfirst(
pcqCtx,
cql("SELECT * FROM pg_tablespace "
" WHERE spcname = :1 "
" FOR UPDATE ",
CStringGetDatum(name)));
if (!HeapTupleIsValid(tup))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("tablespace \"%s\" does not exist", name)));
tablespaceoid = HeapTupleGetOid(tup);
spcForm = (Form_pg_tablespace) GETSTRUCT(tup);
/*
* If the new owner is the same as the existing owner, consider the
* command to have succeeded. This is for dump restoration purposes.
*/
if (spcForm->spcowner != newOwnerId)
{
Datum repl_val[Natts_pg_tablespace];
bool repl_null[Natts_pg_tablespace];
bool repl_repl[Natts_pg_tablespace];
Acl *newAcl;
Datum aclDatum;
bool isNull;
HeapTuple newtuple;
/* Otherwise, must be owner of the existing object */
if (!pg_tablespace_ownercheck(tablespaceoid, GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_TABLESPACE,
name);
/* Must be able to become new owner */
check_is_member_of_role(GetUserId(), newOwnerId);
/*
* Normally we would also check for create permissions here, but there
* are none for tablespaces so we follow what rename tablespace does
* and omit the create permissions check.
*
* NOTE: Only superusers may create tablespaces to begin with and so
* initially only a superuser would be able to change its ownership
* anyway.
*/
memset(repl_null, false, sizeof(repl_null));
memset(repl_repl, false, sizeof(repl_repl));
repl_repl[Anum_pg_tablespace_spcowner - 1] = true;
repl_val[Anum_pg_tablespace_spcowner - 1] = ObjectIdGetDatum(newOwnerId);
/*
* Determine the modified ACL for the new owner. This is only
* necessary when the ACL is non-null.
*/
aclDatum = heap_getattr(tup,
Anum_pg_tablespace_spcacl,
RelationGetDescr(rel),
&isNull);
if (!isNull)
{
newAcl = aclnewowner(DatumGetAclP(aclDatum),
spcForm->spcowner, newOwnerId);
repl_repl[Anum_pg_tablespace_spcacl - 1] = true;
repl_val[Anum_pg_tablespace_spcacl - 1] = PointerGetDatum(newAcl);
}
newtuple = caql_modify_current(pcqCtx, repl_val, repl_null, repl_repl);
caql_update_current(pcqCtx, newtuple);
/* and Update indexes (implicit) */
/* MPP-6929: metadata tracking */
if (Gp_role == GP_ROLE_DISPATCH)
MetaTrackUpdObject(TableSpaceRelationId,
tablespaceoid,
GetUserId(),
"ALTER", "OWNER"
);
heap_freetuple(newtuple);
/* Update owner dependency reference */
changeDependencyOnOwner(TableSpaceRelationId, HeapTupleGetOid(tup),
newOwnerId);
}
heap_close(rel, NoLock);
}
/*
* LargeObjectAlterOwner
*
* Implementation of ALTER LARGE OBJECT statement
*/
void
LargeObjectAlterOwner(Oid loid, Oid newOwnerId)
{
Form_pg_largeobject_metadata form_lo_meta;
Relation pg_lo_meta;
ScanKeyData skey[1];
SysScanDesc scan;
HeapTuple oldtup;
HeapTuple newtup;
pg_lo_meta = heap_open(LargeObjectMetadataRelationId,
RowExclusiveLock);
ScanKeyInit(&skey[0],
ObjectIdAttributeNumber,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(loid));
scan = systable_beginscan(pg_lo_meta,
LargeObjectMetadataOidIndexId, true,
SnapshotNow, 1, skey);
oldtup = systable_getnext(scan);
if (!HeapTupleIsValid(oldtup))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("large object %u does not exist", loid)));
form_lo_meta = (Form_pg_largeobject_metadata) GETSTRUCT(oldtup);
if (form_lo_meta->lomowner != newOwnerId)
{
Datum values[Natts_pg_largeobject_metadata];
bool nulls[Natts_pg_largeobject_metadata];
bool replaces[Natts_pg_largeobject_metadata];
Acl *newAcl;
Datum aclDatum;
bool isnull;
/* Superusers can always do it */
if (!superuser())
{
/*
* lo_compat_privileges is not checked here, because ALTER LARGE
* OBJECT ... OWNER did not exist at all prior to PostgreSQL 9.0.
*
* We must be the owner of the existing object.
*/
if (!pg_largeobject_ownercheck(loid, GetUserId()))
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be owner of large object %u", loid)));
/* Must be able to become new owner */
check_is_member_of_role(GetUserId(), newOwnerId);
}
memset(values, 0, sizeof(values));
memset(nulls, false, sizeof(nulls));
memset(replaces, false, sizeof(nulls));
values[Anum_pg_largeobject_metadata_lomowner - 1]
= ObjectIdGetDatum(newOwnerId);
replaces[Anum_pg_largeobject_metadata_lomowner - 1] = true;
/*
* Determine the modified ACL for the new owner. This is only
* necessary when the ACL is non-null.
*/
aclDatum = heap_getattr(oldtup,
Anum_pg_largeobject_metadata_lomacl,
RelationGetDescr(pg_lo_meta), &isnull);
if (!isnull)
{
newAcl = aclnewowner(DatumGetAclP(aclDatum),
form_lo_meta->lomowner, newOwnerId);
values[Anum_pg_largeobject_metadata_lomacl - 1]
= PointerGetDatum(newAcl);
replaces[Anum_pg_largeobject_metadata_lomacl - 1] = true;
}
newtup = heap_modify_tuple(oldtup, RelationGetDescr(pg_lo_meta),
values, nulls, replaces);
simple_heap_update(pg_lo_meta, &newtup->t_self, newtup);
CatalogUpdateIndexes(pg_lo_meta, newtup);
heap_freetuple(newtup);
/* Update owner dependency reference */
changeDependencyOnOwner(LargeObjectRelationId,
loid, newOwnerId);
}
systable_endscan(scan);
heap_close(pg_lo_meta, RowExclusiveLock);
}