[ostree] core: Add rev-parse builtin

[Colin Walters <walters src gnome org>]

commit dd13d172ef329c0c1e9b9199f0a1e961a9166d20
Author: Colin Walters <walters verbum org>
Date:   Thu Oct 27 15:44:08 2011 -0400

    core: Add rev-parse builtin

 Makefile-src.am            |    1 +
 src/main.c                 |    1 +
 src/ot-builtin-rev-parse.c |   78 ++++++++++++++++++++++++++++++++++++++++++++
 src/ot-builtins.h          |    1 +
 tests/t0002-commit-one.sh  |    4 ++-
 5 files changed, 84 insertions(+), 1 deletions(-)
---
diff --git a/Makefile-src.am b/Makefile-src.am
index 8076396..bdc1048 100644
--- a/Makefile-src.am
+++ b/Makefile-src.am
@@ -54,6 +54,7 @@ ostree_SOURCES = src/main.c \
 	src/ot-builtin-link-file.c \
 	src/ot-builtin-log.c \
 	src/ot-builtin-run-triggers.c \
+	src/ot-builtin-rev-parse.c \
 	src/ot-builtin-show.c \
 	$(NULL)
 ostree_CFLAGS = -I$(srcdir)/src -I$(srcdir)/src/libostree -I$(srcdir)/src/libotutil -DLOCALEDIR=\"$(datadir)/locale\" $(GIO_UNIX_CFLAGS)
diff --git a/src/main.c b/src/main.c
index 5936fc3..3bf9824 100644
--- a/src/main.c
+++ b/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 }
diff --git a/src/ot-builtin-rev-parse.c b/src/ot-builtin-rev-parse.c
new file mode 100644
index 0000000..7b24b7e
--- /dev/null
+++ b/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;
+}
diff --git a/src/ot-builtins.h b/src/ot-builtins.h
index ea0deda..e4d6d91 100644
--- a/src/ot-builtins.h
+++ b/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
 
diff --git a/tests/t0002-commit-one.sh b/tests/t0002-commit-one.sh
index 68c76bf..0978d56 100755
--- a/tests/t0002-commit-one.sh
+++ b/tests/t0002-commit-one.sh
@@ -22,7 +22,7 @@ set -e
 
 . libtest.sh
 
-echo '1..3'
+echo '1..4'
 
 mkdir files
 cd files
@@ -36,3 +36,5 @@ ostree commit $repo -s "Test Commit" -m "Commit body" --add=yy
 echo 'ok commit'
 ostree fsck -q $repo
 echo 'ok fsck'
+ostree rev-parse
+echo 'ok rev-parse'