core: Fix ostree-pull to be able to look up remotes in parent repo

We should probably add a generalized inheritance mechanism.

src/libostree/ostree-repo.c

@@ -781,6 +781,22 @@ ostree_repo_get_mode (OstreeRepo  *self)
   return priv->mode;
 }
 
+/**
+ * ostree_repo_get_parent:
+ * @self:
+ * 
+ * Before this function can be used, ostree_repo_init() must have been
+ * called.
+ *
+ * Returns: (transfer none): Parent repository, or %NULL if none
+ */
+OstreeRepo *
+ostree_repo_get_parent (OstreeRepo  *self)
+{
+  OstreeRepoPrivate *priv = GET_PRIVATE (self);
+  return priv->parent_repo;
+}
+
 GFile *
 ostree_repo_get_file_object_path (OstreeRepo   *self,
                                   const char   *checksum)

src/libostree/ostree-repo.h

@@ -69,6 +69,8 @@ GKeyFile *    ostree_repo_get_config (OstreeRepo *self);
 
 GKeyFile *    ostree_repo_copy_config (OstreeRepo *self);
 
+OstreeRepo * ostree_repo_get_parent (OstreeRepo  *self);
+
 gboolean      ostree_repo_write_config (OstreeRepo *self,
                                         GKeyFile   *new_config,
                                         GError    **error);