[ostree] deltas: Support passing filename to ostree_repo_static_delta_execute_offline

[Alexander Larsson <alexl src gnome org>]

commit ec56fea82170d2c60406ccd6369dafbdad2a14d7
Author: Alexander Larsson <alexl redhat com>
Date:   Fri Oct 16 12:54:01 2015 +0200

    deltas: Support passing filename to ostree_repo_static_delta_execute_offline
    
    If you pass a diriectory it will look for the "superblock" child, otherwise
    it will use the file as the superblock. I need this in xdg-app to be able
    to install any filename as a bundle.

 src/libostree/ostree-repo-static-delta-core.c |   21 ++++++++++++++++++---
 src/libostree/ostree-repo.h                   |    2 +-
 2 files changed, 19 insertions(+), 4 deletions(-)
---
diff --git a/src/libostree/ostree-repo-static-delta-core.c b/src/libostree/ostree-repo-static-delta-core.c
index c373b60..2e44578 100644
--- a/src/libostree/ostree-repo-static-delta-core.c
+++ b/src/libostree/ostree-repo-static-delta-core.c
@@ -206,7 +206,7 @@ _ostree_repo_static_delta_part_have_all_objects (OstreeRepo             *repo,
 /**
  * ostree_repo_static_delta_execute_offline:
  * @self: Repo
- * @dir: Path to a directory containing static delta data
+ * @dir_or_file: Path to a directory containing static delta data, or directly to the superblock
  * @skip_validation: If %TRUE, assume data integrity
  * @cancellable: Cancellable
  * @error: Error
@@ -218,20 +218,35 @@ _ostree_repo_static_delta_part_have_all_objects (OstreeRepo             *repo,
  */
 gboolean
 ostree_repo_static_delta_execute_offline (OstreeRepo                    *self,
-                                          GFile                         *dir,
+                                          GFile                         *dir_or_file,
                                           gboolean                       skip_validation,
                                           GCancellable                  *cancellable,
                                           GError                      **error)
 {
   gboolean ret = FALSE;
   guint i, n;
-  g_autoptr(GFile) meta_file = g_file_get_child (dir, "superblock");
+  g_autoptr(GFile) meta_file = NULL;
+  g_autoptr(GFile) dir = NULL;
   g_autoptr(GVariant) meta = NULL;
   g_autoptr(GVariant) headers = NULL;
   g_autoptr(GVariant) metadata = NULL;
   g_autoptr(GVariant) fallback = NULL;
   g_autofree char *to_checksum = NULL;
   g_autofree char *from_checksum = NULL;
+  GFileType file_type;
+
+
+  file_type = g_file_query_file_type (dir_or_file, 0, cancellable);
+  if (file_type == G_FILE_TYPE_DIRECTORY)
+    {
+      dir = g_object_ref (dir_or_file);
+      meta_file = g_file_get_child (dir, "superblock");
+    }
+  else
+    {
+      meta_file = g_object_ref (dir_or_file);
+      dir = g_file_get_parent (meta_file);
+    }
 
   if (!ot_util_variant_map (meta_file, G_VARIANT_TYPE (OSTREE_STATIC_DELTA_SUPERBLOCK_FORMAT),
                             FALSE, &meta, error))
diff --git a/src/libostree/ostree-repo.h b/src/libostree/ostree-repo.h
index 38a261f..e67c310 100644
--- a/src/libostree/ostree-repo.h
+++ b/src/libostree/ostree-repo.h
@@ -594,7 +594,7 @@ gboolean ostree_repo_static_delta_generate (OstreeRepo                   *self,
                                             GError                      **error);
 
 gboolean ostree_repo_static_delta_execute_offline (OstreeRepo                    *self,
-                                                   GFile                         *dir,
+                                                   GFile                         *dir_or_file,
                                                    gboolean                       skip_validation,
                                                    GCancellable                  *cancellable,
                                                    GError                      **error);