#include "catalog/pg_type.h"
#include "commands/alter.h"
#include "commands/comment.h"
+#include "commands/defrem.h"
#include "commands/extension.h"
#include "commands/schemacmds.h"
#include "funcapi.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
+#include "nodes/makefuncs.h"
#include "storage/fd.h"
#include "tcop/utility.h"
#include "utils/builtins.h"
}
/*
- * CREATE EXTENSION
+ * CREATE EXTENSION worker
+ *
+ * When CASCADE is specified CreateExtensionInternal() recurses if required
+ * extensions need to be installed. To sanely handle cyclic dependencies
+ * cascade_parent contains the dependency chain leading to the current
+ * invocation; thus allowing to error out if there's a cyclic dependency.
*/
-ObjectAddress
-CreateExtension(CreateExtensionStmt *stmt)
+static ObjectAddress
+CreateExtensionInternal(CreateExtensionStmt *stmt, List *parents)
{
DefElem *d_schema = NULL;
DefElem *d_new_version = NULL;
DefElem *d_old_version = NULL;
- char *schemaName;
- Oid schemaOid;
+ DefElem *d_cascade = NULL;
+ char *schemaName = NULL;
+ Oid schemaOid = InvalidOid;
char *versionName;
char *oldVersionName;
+ bool cascade = false;
Oid extowner = GetUserId();
ExtensionControlFile *pcontrol;
ExtensionControlFile *control;
ListCell *lc;
ObjectAddress address;
- /* Check extension name validity before any filesystem access */
- check_valid_extension_name(stmt->extname);
-
- /*
- * Check for duplicate extension name. The unique index on
- * pg_extension.extname would catch this anyway, and serves as a backstop
- * in case of race conditions; but this is a friendlier error message, and
- * besides we need a check to support IF NOT EXISTS.
- */
- if (get_extension_oid(stmt->extname, true) != InvalidOid)
- {
- if (stmt->if_not_exists)
- {
- ereport(NOTICE,
- (errcode(ERRCODE_DUPLICATE_OBJECT),
- errmsg("extension \"%s\" already exists, skipping",
- stmt->extname)));
- return InvalidObjectAddress;
- }
- else
- ereport(ERROR,
- (errcode(ERRCODE_DUPLICATE_OBJECT),
- errmsg("extension \"%s\" already exists",
- stmt->extname)));
- }
-
- /*
- * We use global variables to track the extension being created, so we can
- * create only one extension at the same time.
- */
- if (creating_extension)
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("nested CREATE EXTENSION is not supported")));
-
/*
* Read the primary control file. Note we assume that it does not contain
* any non-ASCII data, so there is no need to worry about encoding at this
errmsg("conflicting or redundant options")));
d_old_version = defel;
}
+ else if (strcmp(defel->defname, "cascade") == 0)
+ {
+ if (d_cascade)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("conflicting or redundant options")));
+ d_cascade = defel;
+ cascade = defGetBoolean(d_cascade);
+ }
else
elog(ERROR, "unrecognized option: %s", defel->defname);
}
{
/*
* User given schema, CREATE EXTENSION ... WITH SCHEMA ...
- *
- * It's an error to give a schema different from control->schema if
- * control->schema is specified.
*/
schemaName = strVal(d_schema->arg);
- if (control->schema != NULL &&
- strcmp(control->schema, schemaName) != 0)
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("extension \"%s\" must be installed in schema \"%s\"",
- control->name,
- control->schema)));
-
- /* If the user is giving us the schema name, it must exist already */
+ /* If the user is giving us the schema name, it must exist already. */
schemaOid = get_namespace_oid(schemaName, false);
}
- else if (control->schema != NULL)
+
+ if (control->schema != NULL)
{
/*
* The extension is not relocatable and the author gave us a schema
- * for it. We create the schema here if it does not already exist.
+ * for it.
+ *
+ * Unless CASCADE parameter was given, it's an error to give a schema
+ * different from control->schema if control->schema is specified.
*/
+ if (schemaName && strcmp(control->schema, schemaName) != 0 &&
+ !cascade)
+ ereport(ERROR,
+ (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+ errmsg("extension \"%s\" must be installed in schema \"%s\"",
+ control->name,
+ control->schema)));
+
+ /* Always use the schema from control file for current extension. */
schemaName = control->schema;
+
+ /* Find or create the schema in case it does not exist. */
schemaOid = get_namespace_oid(schemaName, true);
- if (schemaOid == InvalidOid)
+ if (!OidIsValid(schemaOid))
{
CreateSchemaStmt *csstmt = makeNode(CreateSchemaStmt);
/*
* CreateSchemaCommand includes CommandCounterIncrement, so new
- * schema is now visible
+ * schema is now visible.
*/
schemaOid = get_namespace_oid(schemaName, false);
}
}
- else
+ else if (!OidIsValid(schemaOid))
{
/*
- * Else, use the current default creation namespace, which is the
- * first explicit entry in the search_path.
+ * Neither user nor author of the extension specified schema, use the
+ * current default creation namespace, which is the first explicit
+ * entry in the search_path.
*/
List *search_path = fetch_search_path(false);
Oid reqext;
Oid reqschema;
- /*
- * We intentionally don't use get_extension_oid's default error
- * message here, because it would be confusing in this context.
- */
reqext = get_extension_oid(curreq, true);
if (!OidIsValid(reqext))
- ereport(ERROR,
- (errcode(ERRCODE_UNDEFINED_OBJECT),
- errmsg("required extension \"%s\" is not installed",
- curreq)));
+ {
+ if (cascade)
+ {
+ CreateExtensionStmt *ces;
+ ListCell *lc;
+ ObjectAddress addr;
+ List *cascade_parents;
+
+ /* Check extension name validity before trying to cascade */
+ check_valid_extension_name(curreq);
+
+ /* Check for cyclic dependency between extensions. */
+ foreach(lc, parents)
+ {
+ char *pname = (char *) lfirst(lc);
+
+ if (strcmp(pname, curreq) == 0)
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_RECURSION),
+ errmsg("cyclic dependency detected between extensions \"%s\" and \"%s\"",
+ curreq, stmt->extname)));
+ }
+
+ ereport(NOTICE,
+ (errmsg("installing required extension \"%s\"",
+ curreq)));
+
+ /* Create and execute new CREATE EXTENSION statement. */
+ ces = makeNode(CreateExtensionStmt);
+ ces->extname = curreq;
+
+ /* Propagate the CASCADE option */
+ ces->options = list_make1(d_cascade);
+
+ /* Propagate the SCHEMA option if given. */
+ if (d_schema && d_schema->arg)
+ ces->options = lappend(ces->options, d_schema);
+
+ /*
+ * Pass the current list of parents + the current extension to
+ * the "child" CreateExtensionInternal().
+ */
+ cascade_parents =
+ lappend(list_copy(parents), stmt->extname);
+
+ /* Create the required extension. */
+ addr = CreateExtensionInternal(ces, cascade_parents);
+ reqext = addr.objectId;
+ }
+ else
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_OBJECT),
+ errmsg("required extension \"%s\" is not installed",
+ curreq),
+ errhint("Use CREATE EXTENSION CASCADE to install required extensions too.")));
+ }
+
reqschema = get_extension_schema(reqext);
requiredExtensions = lappend_oid(requiredExtensions, reqext);
requiredSchemas = lappend_oid(requiredSchemas, reqschema);
return address;
}
+/*
+ * CREATE EXTENSION
+ */
+ObjectAddress
+CreateExtension(CreateExtensionStmt *stmt)
+{
+ /* Check extension name validity before any filesystem access */
+ check_valid_extension_name(stmt->extname);
+
+ /*
+ * Check for duplicate extension name. The unique index on
+ * pg_extension.extname would catch this anyway, and serves as a backstop
+ * in case of race conditions; but this is a friendlier error message, and
+ * besides we need a check to support IF NOT EXISTS.
+ */
+ if (get_extension_oid(stmt->extname, true) != InvalidOid)
+ {
+ if (stmt->if_not_exists)
+ {
+ ereport(NOTICE,
+ (errcode(ERRCODE_DUPLICATE_OBJECT),
+ errmsg("extension \"%s\" already exists, skipping",
+ stmt->extname)));
+ return InvalidObjectAddress;
+ }
+ else
+ ereport(ERROR,
+ (errcode(ERRCODE_DUPLICATE_OBJECT),
+ errmsg("extension \"%s\" already exists",
+ stmt->extname)));
+ }
+
+ /*
+ * We use global variables to track the extension being created, so we can
+ * create only one extension at the same time.
+ */
+ if (creating_extension)
+ ereport(ERROR,
+ (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+ errmsg("nested CREATE EXTENSION is not supported")));
+
+
+ /* Finally create the extension. */
+ return CreateExtensionInternal(stmt, NIL);
+}
+
/*
* InsertExtensionTuple
*
projects / postgresql / blobdiff