pull-local: Support --depth option

Like pull, allow pull-local to mirror another another repository by
specifying how many parents to traverse.

https://bugzilla.gnome.org/show_bug.cgi?id=750581

tests/test-local-pull-depth.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+#
+# Copyright (C) 2015 Dan Nicholson <nicholson@endlessm.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.
+
+set -e
+
+. $(dirname $0)/libtest.sh
+
+setup_test_repository "archive-z2"
+
+echo "1..1"
+
+cd ${test_tmpdir}
+mkdir repo2
+${CMD_PREFIX} ostree --repo=repo2 init --mode="archive-z2"
+
+${CMD_PREFIX} ostree --repo=repo2 pull-local repo
+find repo2/objects -name '*.commit' | wc -l > commitcount
+assert_file_has_content commitcount "^1$"
+
+${CMD_PREFIX} ostree --repo=repo2 pull-local --depth=0 repo
+find repo2/objects -name '*.commit' | wc -l > commitcount
+assert_file_has_content commitcount "^1$"
+
+${CMD_PREFIX} ostree --repo=repo2 pull-local --depth=1 repo
+find repo2/objects -name '*.commit' | wc -l > commitcount
+assert_file_has_content commitcount "^2$"
+
+${CMD_PREFIX} ostree --repo=repo2 pull-local --depth=1 repo
+find repo2/objects -name '*.commit' | wc -l > commitcount
+assert_file_has_content commitcount "^2$"
+
+${CMD_PREFIX} ostree --repo=repo2 pull-local --depth=-1 repo
+find repo2/objects -name '*.commit' | wc -l > commitcount
+assert_file_has_content commitcount "^2$"
+
+echo "ok local pull depth"