toollib: allow VG UUID to be used in place of VG namedev-dct-process-each-1

If the VG arg from the command line does not match the
name of any known VGs, then check if the arg looks like
a UUID.  If it's a valid UUID, then compare it to the
UUID of known VGs.  If it matches the UUID of a known VG,
then process that VG.

1 files changed, 39 insertions, 0 deletions

diff --git a/tools/toollib.c b/tools/toollib.c
index e49356f12..8e4db5e19 100644
--- a/tools/toollib.c
+++ b/tools/toollib.c
@@ -2077,8 +2077,11 @@ static void _choose_vgs_to_process(struct cmd_context *cmd,
 				   struct dm_list *vgnameids_on_system,
 				   struct dm_list *vgnameids_to_process)
 {
+	char uuid[64] __attribute__((aligned(8)));
 	struct dm_str_list *sl, *sl2;
 	struct vgnameid_list *vgnl, *vgnl2;
+	struct id id;
+	int arg_is_uuid;
 	int found;
 
 	dm_list_iterate_items_safe(sl, sl2, arg_vgnames) {
@@ -2092,6 +2095,42 @@ static void _choose_vgs_to_process(struct cmd_context *cmd,
 			found = 1;
 			break;
 		}
+
+		/*
+		 * If the VG name arg looks like a UUID, then check if it
+		 * matches the UUID of a VG.
+		 *
+		 * FIXME: Do we want to allow vgname args to be interpretted
+		 * as uuids for all commands or only some (e.g. vgrename)?
+		 * If only some, then use a cmd flag to enable this.
+		 */
+		if (!found) {
+			log_suppress(2);
+			arg_is_uuid = id_read_format(&id, sl->str);
+			log_suppress(0);
+		}
+
+		if (!found && arg_is_uuid) {
+			dm_list_iterate_items_safe(vgnl, vgnl2, vgnameids_on_system) {
+				if (!(id_write_format((const struct id*)vgnl->vgid, uuid, sizeof(uuid))))
+					continue;
+
+				if (strcmp(sl->str, uuid))
+					continue;
+
+				log_print("Processing VG %s because of matching UUID %s",
+					  vgnl->vg_name, uuid);
+
+				dm_list_del(&vgnl->list);
+				dm_list_add(vgnameids_to_process, &vgnl->list);
+
+				/* Make the arg_vgnames entry use the actual VG name. */
+				sl->str = dm_pool_strdup(cmd->mem, vgnl->vg_name);
+
+				found = 1;
+				break;
+			}
+		}
 		
 		/*
 		 * If the name arg was not found in the list of all VGs, then