libostree: Add ostree_repo_pull_with_options()

We potentially need a lot of argument types for pull.  Rather than
have a C function with tons of arguments, let's use a GVariant a{sv}
as a handy extensible (and immutable) bag of properties.

This is prepratory work for adding an option to pull to traverse
history.

https://bugzilla.gnome.org/show_bug.cgi?id=737844

src/libostree/ostree-repo.c

@@ -2163,6 +2163,64 @@ ostree_repo_pull (OstreeRepo               *self,
                        "This version of ostree was built without libsoup, and cannot fetch over HTTP");
   return FALSE;
 }
+
+/**
+ * ostree_repo_pull_one_dir:
+ * @self: Repo
+ * @remote_name: Name of remote
+ * @dir_to_pull: Subdirectory path
+ * @refs_to_fetch: (array zero-terminated=1) (element-type utf8) (allow-none): Optional list of refs; if %NULL, fetch all configured refs
+ * @flags: Options controlling fetch behavior
+ * @progress: (allow-none): Progress
+ * @cancellable: Cancellable
+ * @error: Error
+ *
+ * This is similar to ostree_repo_pull(), but only fetches a single
+ * subpath.
+ */
+gboolean
+ostree_repo_pull_one_dir (OstreeRepo               *self,
+                          const char               *remote_name,
+                          char                    **refs_to_fetch,
+                          OstreeRepoPullFlags       flags,
+                          OstreeAsyncProgress      *progress,
+                          GCancellable             *cancellable,
+                          GError                  **error)
+{
+  g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
+                       "This version of ostree was built without libsoup, and cannot fetch over HTTP");
+  return FALSE;
+}
+
+/**
+ * ostree_repo_pull_with_options:
+ * @self: Repo
+ * @remote_name: Name of remote
+ * @options: A GVariant a{sv} with an extensible set of flags.
+ * @progress: (allow-none): Progress
+ * @cancellable: Cancellable
+ * @error: Error
+ *
+ * Like ostree_repo_pull(), but supports an extensible set of flags.
+ * The following are currently defined:
+ *
+ *   * subdir (s): Pull just this subdirectory
+ *   * flags (i): An instance of #OstreeRepoPullFlags
+ *   * refs: (as): Array of string refs
+ */
+gboolean
+ostree_repo_pull_with_options (OstreeRepo             *self,
+                               const char             *remote_name,
+                               GVariant               *options,
+                               OstreeAsyncProgress    *progress,
+                               GCancellable           *cancellable,
+                               GError                **error)
+{
+  g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
+                       "This version of ostree was built without libsoup, and cannot fetch over HTTP");
+  return FALSE;
+}
+
 #endif
 
 /**