core: Add rev-parse builtin

src/main.c

@@ -34,6 +34,7 @@ static OstreeBuiltin builtins[] = {
   { "link-file", ostree_builtin_link_file, 0 },
   { "log", ostree_builtin_log, 0 },
   { "fsck", ostree_builtin_fsck, 0 },
+  { "rev-parse", ostree_builtin_rev_parse, 0 },
   { "run-triggers", ostree_builtin_run_triggers, 0 },
   { "show", ostree_builtin_show, 0 },
   { NULL }

src/ot-builtin-rev-parse.c

@@ -0,0 +1,78 @@
+/* -*- 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 char *repo_path;
+
+static GOptionEntry options[] = {
+  { "repo", 0, 0, G_OPTION_ARG_FILENAME, &repo_path, "Repository path", "repo" },
+  { NULL }
+};
+
+gboolean
+ostree_builtin_rev_parse (int argc, char **argv, const char *prefix, GError **error)
+{
+  GOptionContext *context;
+  gboolean ret = FALSE;
+  OstreeRepo *repo = NULL;
+  const char *rev = "master";
+  char *resolved_rev = NULL;
+  GVariant *variant = NULL;
+  char *formatted_variant = NULL;
+
+  context = g_option_context_new ("- Output the target of a rev");
+  g_option_context_add_main_entries (context, options, NULL);
+
+  if (!g_option_context_parse (context, &argc, &argv, error))
+    goto out;
+
+  if (repo_path == NULL)
+    repo_path = ".";
+
+  repo = ostree_repo_new (repo_path);
+  if (!ostree_repo_check (repo, error))
+    goto out;
+
+  if (argc > 1)
+    rev = argv[1];
+
+  if (!ostree_repo_resolve_rev (repo, rev, &resolved_rev, error))
+    goto out;
+
+  g_print ("%s\n", resolved_rev);
+ 
+  ret = TRUE;
+ out:
+  g_free (resolved_rev);
+  if (context)
+    g_option_context_free (context);
+  g_clear_object (&repo);
+  if (variant)
+    g_variant_unref (variant);
+  g_free (formatted_variant);
+  return ret;
+}

src/ot-builtins.h

@@ -44,6 +44,7 @@ gboolean ostree_builtin_link_file (int argc, char **argv, const char *prefix, GE
 gboolean ostree_builtin_run_triggers (int argc, char **argv, const char *prefix, GError **error);
 gboolean ostree_builtin_fsck (int argc, char **argv, const char *prefix, GError **error);
 gboolean ostree_builtin_show (int argc, char **argv, const char *prefix, GError **error);
+gboolean ostree_builtin_rev_parse (int argc, char **argv, const char *prefix, GError **error);
 
 G_END_DECLS