autofs-5.0.6 - fix offset dir removal

From: Ian Kent <ikent@redhat.com>

When removing autofs multi-mount directories (which usually means the
top level tree where no mount is present at the base) at expire we
need to take care not to remove the top directory of the tree if the
origin map is an indirect mount that has the browse option set.
---

 lib/mounts.c |   43 +++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 2 deletions(-)


--- autofs-5.0.6.orig/lib/mounts.c
+++ autofs-5.0.6/lib/mounts.c
@@ -1687,6 +1687,41 @@ cont:
 	return mounted;
 }
 
+static int rmdir_path_offset(struct autofs_point *ap, struct mapent *oe)
+{
+	char *dir, *path;
+	unsigned int split;
+	int ret;
+
+	if (ap->type == LKP_DIRECT)
+		return rmdir_path(ap, oe->key, oe->multi->dev);
+
+	dir = strdup(oe->key);
+
+	if (ap->flags & MOUNT_FLAG_GHOST)
+		split = strlen(ap->path) + strlen(oe->multi->key) + 1;
+	else
+		split = strlen(ap->path);
+
+	dir[split] = '\0';
+	path = &dir[split + 1];
+
+	if (chdir(dir) == -1) {
+		error(ap->logopt, "failed to chdir to %s", dir);
+		free(dir);
+		return -1;
+	}
+
+	ret = rmdir_path(ap, path, ap->dev);
+
+	free(dir);
+
+	if (chdir("/") == -1)
+		error(ap->logopt, "failed to chdir to /");
+
+	return ret;
+}
+
 int umount_multi_triggers(struct autofs_point *ap, struct mapent *me, char *root, const char *base)
 {
 	char path[PATH_MAX + 1];
@@ -1748,11 +1783,13 @@ int umount_multi_triggers(struct autofs_
 			 * ok so only try and remount the offset if the
 			 * actual mount point still exists.
 			 */
-			ret = rmdir_path(ap, oe->key, ap->dev);
+			ret = rmdir_path_offset(ap, oe);
 			if (ret == -1 && !stat(oe->key, &st)) {
 				ret = do_mount_autofs_offset(ap, oe, root, offset);
 				if (ret)
 					left++;
+				/* But we did origianlly create this */
+				oe->flags |= MOUNT_FLAG_DIR_CREATED;
 			}
 		}
 	}
@@ -1914,11 +1951,13 @@ int clean_stale_multi_triggers(struct au
 			 * ok so only try and remount the offset if the
 			 * actual mount point still exists.
 			 */
-			ret = rmdir_path(ap, oe->key, ap->dev);
+			ret = rmdir_path_offset(ap, oe);
 			if (ret == -1 && !stat(oe->key, &st)) {
 				ret = do_mount_autofs_offset(ap, oe, root, offset);
 				if (ret) {
 					left++;
+					/* But we did origianlly create this */
+					oe->flags |= MOUNT_FLAG_DIR_CREATED;
 					free(key);
 					continue;
 				}