core: Stub out a diff API and builtin

Makefile-ostree.am

@@ -25,6 +25,7 @@ ostree_SOURCES = ostree/main.c \
 	ostree/ot-builtin-checkout.c \
 	ostree/ot-builtin-commit.c \
 	ostree/ot-builtin-compose.c \
+	ostree/ot-builtin-diff.c \
 	ostree/ot-builtin-fsck.c \
 	ostree/ot-builtin-init.c \
 	ostree/ot-builtin-log.c \

libostree/ostree-repo.c

@@ -1842,3 +1842,33 @@ ostree_repo_checkout (OstreeRepo *self,
   g_clear_object (&root_info);
   return ret;
 }
+
+gboolean
+ostree_repo_diff (OstreeRepo     *self,
+                  const char     *ref,
+                  GFile          *target,
+                  GPtrArray     **out_modified,
+                  GPtrArray     **out_removed,
+                  GPtrArray     **out_added,
+                  GCancellable   *cancellable,
+                  GError        **error)
+{
+  gboolean ret = FALSE;
+  GPtrArray *ret_modified = NULL;
+  GPtrArray *ret_removed = NULL;
+  GPtrArray *ret_added = NULL;
+
+  g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
+               "Not implemented yet");
+  goto out;
+
+  ret = TRUE;
+ out:
+  if (ret_modified)
+    g_ptr_array_free (ret_modified, TRUE);
+  if (ret_removed)
+    g_ptr_array_free (ret_removed, TRUE);
+  if (ret_added)
+    g_ptr_array_free (ret_added, TRUE);
+  return ret;
+}

libostree/ostree-repo.h

@@ -124,6 +124,30 @@ gboolean      ostree_repo_checkout (OstreeRepo *self,
                                     GCancellable   *cancellable,
                                     GError      **error);
 
+typedef struct {
+  guint content_differs : 1;
+  guint xattrs_differs : 1;
+  guint unused : 30;
+
+  GFileInfo *src_info;
+  GFileInfo *target_info;
+
+  char *src_file_checksum;
+  char *target_file_checksum;
+
+  GVariant *src_xattrs;
+  GVariant *target_xattrs;
+} OstreeRepoDiffItem;
+
+gboolean      ostree_repo_diff (OstreeRepo     *self,
+                                const char     *ref,
+                                GFile          *target,
+                                GPtrArray     **out_modified, /* OstreeRepoDiffItem */
+                                GPtrArray     **out_removed, /* OstreeRepoDiffItem */
+                                GPtrArray     **out_added, /* OstreeRepoDiffItem */
+                                GCancellable   *cancellable,
+                                GError        **error);
+
 typedef void (*OstreeRepoObjectIter) (OstreeRepo *self, const char *path,
                                         GFileInfo *fileinfo, gpointer user_data);
 

ostree/main.c

@@ -29,6 +29,7 @@
 
 static OstreeBuiltin builtins[] = {
   { "checkout", ostree_builtin_checkout, 0 },
+  { "diff", ostree_builtin_diff, 0 },
   { "init", ostree_builtin_init, 0 },
   { "commit", ostree_builtin_commit, 0 },
   { "compose", ostree_builtin_compose, 0 },

ostree/ot-builtin-diff.c

@@ -0,0 +1,84 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
+ *
+ * Copyright (C) 2011 Colin Walters <walters@verbum.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Author: Colin Walters <walters@verbum.org>
+ */
+
+#include "config.h"
+
+#include "ot-builtins.h"
+#include "ostree.h"
+
+#include <glib/gi18n.h>
+
+static GOptionEntry options[] = {
+  { NULL }
+};
+
+gboolean
+ostree_builtin_diff (int argc, char **argv, const char *repo_path, GError **error)
+{
+  GOptionContext *context;
+  gboolean ret = FALSE;
+  OstreeRepo *repo = NULL;
+  const char *target;
+  const char *rev;
+  GFile *targetf = NULL;
+  GPtrArray *modified = NULL;
+  GPtrArray *removed = NULL;
+  GPtrArray *added = NULL;
+
+  context = g_option_context_new ("REV TARGETDIR - Compare directory TARGETDIR against revision REV");
+  g_option_context_add_main_entries (context, options, NULL);
+
+  if (!g_option_context_parse (context, &argc, &argv, error))
+    goto out;
+
+  repo = ostree_repo_new (repo_path);
+  if (!ostree_repo_check (repo, error))
+    goto out;
+
+  if (argc < 3)
+    {
+      gchar *help = g_option_context_get_help (context, TRUE, NULL);
+      g_printerr ("%s\n", help);
+      g_free (help);
+      g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                               "REV and TARGETDIR must be specified");
+      goto out;
+    }
+
+  rev = argv[1];
+  target = argv[2];
+  targetf = ot_util_new_file_for_path (target);
+  
+  if (!ostree_repo_diff (repo, rev, targetf, &modified, &removed, &added, NULL, error))
+    goto out;
+
+  ret = TRUE;
+ out:
+  g_clear_object (&repo);
+  g_clear_object (&targetf);
+  if (modified)
+    g_ptr_array_free (modified, TRUE);
+  if (removed)
+    g_ptr_array_free (removed, TRUE);
+  if (added)
+    g_ptr_array_free (added, TRUE);
+  return ret;
+}

ostree/ot-builtins.h

@@ -39,6 +39,7 @@ typedef struct {
 gboolean ostree_builtin_checkout (int argc, char **argv, const char *repo, GError **error);
 gboolean ostree_builtin_commit (int argc, char **argv, const char *repo, GError **error);
 gboolean ostree_builtin_compose (int argc, char **argv, const char *repo, GError **error);
+gboolean ostree_builtin_diff (int argc, char **argv, const char *repo, GError **error);
 gboolean ostree_builtin_init (int argc, char **argv, const char *repo, GError **error);
 gboolean ostree_builtin_log (int argc, char **argv, const char *repo, GError **error);
 gboolean ostree_builtin_pull (int argc, char **argv, const char *repo, GError **error);