groupdb: readd groupdb:backend parametric option

This reverts c5adb92c020e38644baf1afc8fc570a518cd6307.

The reason is that ldb doesn't work for cluster setups yet.

metze
(cherry picked from commit 5f5d90ef76b969ecbe564399368a7450c4e3d155)

1 files changed, 20 insertions, 2 deletions

diff --git a/source/groupdb/mapping.c b/source/groupdb/mapping.c
index 1ddda583df8..ce66bfa64fa 100644
--- a/source/groupdb/mapping.c
+++ b/source/groupdb/mapping.c
@@ -30,12 +30,30 @@ static const struct mapping_backend *backend;
  */
 static bool init_group_mapping(void)
 {
+	const char *backend_string;
+
 	if (backend != NULL) {
 		/* already initialised */
 		return True;
 	}
-	
-	backend = groupdb_ldb_init();
+
+	/*
+	 * default to using the ldb backend. This parameter should
+	 * disappear in future versions of Samba3.
+	 *
+	 * But it's needed for cluster setups, because it's
+	 * not yet possible to distribute a ldb inside a cluster.
+	 */
+	backend_string = lp_parm_const_string(-1, "groupdb", "backend", "ldb");
+
+	if (strcmp(backend_string, "ldb") == 0) {
+		backend = groupdb_ldb_init();
+	} else if (strcmp(backend_string, "tdb") == 0) {
+		backend = groupdb_tdb_init();
+	} else {
+		DEBUG(0,("Unknown groupdb backend '%s'\n", backend_string));
+		smb_panic("Unknown groupdb backend");
+	}
 
 	return backend != NULL;
 }