[ostree] Add 'ostree log' command

[Stefan Walter <stefw src gnome org>]

commit 3989e0d397aa7e4fb23dd4615e38f16358857e9c
Author: Stef Walter <stefw redhat com>
Date:   Wed Aug 14 11:47:30 2013 +0200

    Add 'ostree log' command
    
    Follows the parent of commits showing each in turn until it reaches
    the top of the commit tree.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=705973

 Makefile-ostree.am          |    1 +
 src/ostree/main.c           |    1 +
 src/ostree/ot-builtin-log.c |  107 +++++++++++++++++++++++++++++++++++++++++++
 src/ostree/ot-builtins.h    |    1 +
 tests/test-basic.sh         |   12 ++++-
 5 files changed, 121 insertions(+), 1 deletions(-)
---
diff --git a/Makefile-ostree.am b/Makefile-ostree.am
index 1fe74de..ccfd374 100644
--- a/Makefile-ostree.am
+++ b/Makefile-ostree.am
@@ -31,6 +31,7 @@ ostree_SOURCES = src/ostree/main.c \
        src/ostree/ot-builtin-fsck.c \
        src/ostree/ot-builtin-init.c \
        src/ostree/ot-builtin-pull-local.c \
+       src/ostree/ot-builtin-log.c \
        src/ostree/ot-builtin-ls.c \
        src/ostree/ot-builtin-prune.c \
        src/ostree/ot-builtin-refs.c \
diff --git a/src/ostree/main.c b/src/ostree/main.c
index cec12b3..1542095 100644
--- a/src/ostree/main.c
+++ b/src/ostree/main.c
@@ -40,6 +40,7 @@ static OstreeCommand commands[] = {
   { "diff", ostree_builtin_diff, 0 },
   { "fsck", ostree_builtin_fsck, 0 },
   { "init", ostree_builtin_init, 0 },
+  { "log", ostree_builtin_log, 0 },
   { "ls", ostree_builtin_ls, 0 },
   { "refs", ostree_builtin_refs, 0 },
   { "prune", ostree_builtin_prune, 0 },
diff --git a/src/ostree/ot-builtin-log.c b/src/ostree/ot-builtin-log.c
new file mode 100644
index 0000000..a79fcca
--- /dev/null
+++ b/src/ostree/ot-builtin-log.c
@@ -0,0 +1,107 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
+ *
+ * Copyright (C) 2013 Stef Walter <stefw redhat com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: Stef Walter <stefw redhat com>
+ */
+
+#include "config.h"
+
+#include "ot-builtins.h"
+#include "ot-dump.h"
+#include "ostree.h"
+#include "otutil.h"
+
+static gboolean opt_raw;
+
+static GOptionEntry options[] = {
+  { "raw", 0, 0, G_OPTION_ARG_NONE, &opt_raw, "Show raw variant data" },
+  { NULL }
+};
+
+static gboolean
+log_commit (OstreeRepo     *repo,
+            const gchar    *checksum,
+            OstreeDumpFlags flags,
+            GError        **error)
+{
+  gs_unref_variant GVariant *variant = NULL;
+  gs_free gchar *parent = NULL;
+  gboolean ret = FALSE;
+
+  if (!ostree_repo_load_variant (repo, OSTREE_OBJECT_TYPE_COMMIT, checksum, &variant, error))
+    goto out;
+
+  ot_dump_object (OSTREE_OBJECT_TYPE_COMMIT, checksum, variant, flags);
+
+  /* Get the parent of this commit */
+  parent = ostree_commit_get_parent (variant);
+  if (parent && !log_commit (repo, parent, flags, error))
+    goto out;
+
+  ret = TRUE;
+out:
+  return ret;
+}
+
+gboolean
+ostree_builtin_log (int           argc,
+                    char        **argv,
+                    GFile        *repo_path,
+                    GCancellable *cancellable,
+                    GError      **error)
+{
+  GOptionContext *context;
+  gboolean ret = FALSE;
+  const char *rev;
+  gs_unref_object OstreeRepo *repo = NULL;
+  gs_free char *checksum = NULL;
+  OstreeDumpFlags flags = OSTREE_DUMP_NONE;
+
+  context = g_option_context_new ("REF - Show log starting at commit or ref");
+  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 (opt_raw)
+    flags |= OSTREE_DUMP_RAW;
+
+  if (argc <= 1)
+    {
+      ot_util_usage_error (context, "A ref argument is required", error);
+      goto out;
+    }
+  rev = argv[1];
+
+  if (!ostree_repo_resolve_rev (repo, rev, FALSE, &checksum, error))
+    goto out;
+
+  if (!log_commit (repo, checksum, flags, error))
+    goto out;
+
+  ret = TRUE;
+ out:
+  if (context)
+    g_option_context_free (context);
+  return ret;
+}
diff --git a/src/ostree/ot-builtins.h b/src/ostree/ot-builtins.h
index 358ceea..69af373 100644
--- a/src/ostree/ot-builtins.h
+++ b/src/ostree/ot-builtins.h
@@ -34,6 +34,7 @@ gboolean ostree_builtin_checksum (int argc, char **argv, GFile *repo_path, GCanc
 gboolean ostree_builtin_commit (int argc, char **argv, GFile *repo_path, GCancellable *cancellable, GError 
**error);
 gboolean ostree_builtin_diff (int argc, char **argv, GFile *repo_path, GCancellable *cancellable, GError 
**error);
 gboolean ostree_builtin_init (int argc, char **argv, GFile *repo_path, GCancellable *cancellable, GError 
**error);
+gboolean ostree_builtin_log (int argc, char **argv, GFile *repo_path, GCancellable *cancellable, GError 
**error);
 gboolean ostree_builtin_pull (int argc, char **argv, GFile *repo_path, GCancellable *cancellable, GError 
**error);
 gboolean ostree_builtin_pull_local (int argc, char **argv, GFile *repo_path, GCancellable *cancellable, 
GError **error);
 gboolean ostree_builtin_ls (int argc, char **argv, GFile *repo_path, GCancellable *cancellable, GError 
**error);
diff --git a/tests/test-basic.sh b/tests/test-basic.sh
index 0bf9fdc..154a93d 100755
--- a/tests/test-basic.sh
+++ b/tests/test-basic.sh
@@ -19,7 +19,7 @@
 
 set -e
 
-echo "1..37"
+echo "1..38"
 
 . $(dirname $0)/libtest.sh
 
@@ -255,3 +255,13 @@ $OSTREE show test4 > show-output
 assert_file_has_content show-output "Third commit"
 assert_file_has_content show-output "commit $checksum"
 echo "ok show full output"
+
+cd ${test_tmpdir}
+checksum1=$($OSTREE commit -b test5 -s "First commit")
+checksum2=$($OSTREE commit -b test5 -s "Second commit")
+$OSTREE log test5 > log-output
+assert_file_has_content log-output "First commit"
+assert_file_has_content log-output "commit $checksum1"
+assert_file_has_content log-output "Second commit"
+assert_file_has_content log-output "commit $checksum2"
+echo "ok log output"