core: Add ostree checkout --compose

This allows merging e.g. multiple artifact trees into one big tree.

tests/t0005-checkout-compose.sh

@@ -0,0 +1,63 @@
+#!/bin/bash
+#
+# 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>
+
+set -e
+
+echo "1..8"
+
+. libtest.sh
+
+setup_test_repository "regular"
+
+ostree checkout $ot_repo test2 checkout-test2
+
+cd "${test_tmpdir}"
+mkdir artifact-libfoo-runtime
+cd artifact-libfoo-runtime
+mkdir -p usr/lib/
+echo 'an ELF file' > usr/lib/libfoo.so
+mkdir -p usr/share
+echo 'some data' > usr/share/foo.data
+
+find | grep -v '^\.$' | ostree commit $ot_repo -b artifact-libfoo-runtime -s 'Build 12345 of libfoo' --from-stdin
+
+cd "${test_tmpdir}"
+mkdir artifact-libfoo-devel
+cd artifact-libfoo-devel
+mkdir -p usr/include
+echo 'a header' > usr/include/foo.h
+mkdir -p usr/share/doc
+echo 'some documentation' > usr/share/doc/foo.txt
+
+find | grep -v '^\.$' | ostree commit $ot_repo -b artifact-libfoo-devel -s 'Build 12345 of libfoo' --from-stdin
+
+cd "${test_tmpdir}"
+mkdir artifact-barapp
+cd artifact-barapp
+mkdir -p usr/bin
+echo 'another ELF file' > usr/bin/bar
+
+find | grep -v '^\.$' | ostree commit $ot_repo -b artifact-barapp -s 'Build 42 of barapp' --from-stdin
+
+echo 'ok artifacts committed'
+
+cd "${test_tmpdir}"
+ostree checkout $ot_repo --compose some-compose artifact-libfoo-runtime artifact-libfoo-devel artifact-barapp
+echo 'ok compose command'