[ostree] deltas: Fix regression in ostree_repo_static_delta_execute_offline

[Alexander Larsson <alexl src gnome org>]

commit 1833142b14255f5ddf0fd2b991a4b5aa5a6ecc92
Author: Alexander Larsson <alexl redhat com>
Date:   Wed Feb 24 15:17:46 2016 +0100

    deltas: Fix regression in ostree_repo_static_delta_execute_offline
    
    xdg-app passed this a filename directly, and in this case it should be
    used as is. This regressed to always look for "superblock" in the same
    directory as the passed in filename.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=762617

 src/libostree/ostree-repo-static-delta-core.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/src/libostree/ostree-repo-static-delta-core.c b/src/libostree/ostree-repo-static-delta-core.c
index eb6de3b..ea5842f 100644
--- a/src/libostree/ostree-repo-static-delta-core.c
+++ b/src/libostree/ostree-repo-static-delta-core.c
@@ -240,6 +240,7 @@ ostree_repo_static_delta_execute_offline (OstreeRepo                    *self,
   g_autoptr(GVariant) fallback = NULL;
   g_autofree char *to_checksum = NULL;
   g_autofree char *from_checksum = NULL;
+  g_autofree char *basename = NULL;
 
   dir_or_file_path = gs_file_get_path_cached (dir_or_file);
 
@@ -255,13 +256,16 @@ ostree_repo_static_delta_execute_offline (OstreeRepo                    *self,
       else
         {
           g_autofree char *dir = dirname (g_strdup (dir_or_file_path));
+          basename = g_path_get_basename (dir_or_file_path);
 
           if (!glnx_opendirat (AT_FDCWD, dir, TRUE, &dfd, error))
             goto out;
         }
     }
+  else
+    basename = g_strdup ("superblock");
 
-  meta_fd = openat (dfd, "superblock", O_RDONLY | O_CLOEXEC);
+  meta_fd = openat (dfd, basename, O_RDONLY | O_CLOEXEC);
   if (meta_fd < 0)
     {
       glnx_set_error_from_errno (error);