tests: add hwdb parsing test

This calls the built "systemd-hwdb update" on the source tree's hwdb/ in a
temporary directory and verifies that there are no error messages.

Makefile.am

@@ -3897,7 +3897,8 @@ EXTRA_DIST += \
 # ------------------------------------------------------------------------------
 if ENABLE_TESTS
 TESTS += \
-	test/udev-test.pl
+	test/udev-test.pl \
+	test/hwdb-test.sh
 
 if HAVE_PYTHON
 TESTS += \
@@ -3952,6 +3953,7 @@ DISTCLEAN_LOCAL_HOOKS += test-sys-distclean
 EXTRA_DIST += \
 	test/sys.tar.xz \
 	test/udev-test.pl \
+	test/hwdb-test.sh \
 	test/rule-syntax-check.py \
 	test/sysv-generator-test.py \
 	test/mocks/fsck \

test/hwdb-test.sh

@@ -0,0 +1,43 @@
+#!/bin/sh
+# call built systemd-hwdb update on our hwdb files to ensure that they parse
+# without error
+#
+# (C) 2016 Canonical Ltd.
+# Author: Martin Pitt <martin.pitt@ubuntu.com>
+#
+# systemd 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 2.1 of the License, or
+# (at your option) any later version.
+
+# systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+
+set -e
+
+ROOTDIR=$(dirname $(dirname $(readlink -f $0)))
+SYSTEMD_HWDB=${builddir:-.}/systemd-hwdb
+
+if [ ! -x "$SYSTEMD_HWDB" ]; then
+    echo "$SYSTEMD_HWDB does not exist, please build first"
+    exit 1
+fi
+
+D=$(mktemp --directory)
+trap "rm -rf '$D'" EXIT INT QUIT PIPE
+mkdir -p "$D/etc/udev"
+ln -s "$ROOTDIR/hwdb" "$D/etc/udev/hwdb.d"
+err=$("$SYSTEMD_HWDB" update --root "$D" 2>&1 >/dev/null)
+if [ -n "$err" ]; then
+    echo "$err"
+    exit 1
+fi
+if [ ! -e "$D/etc/udev/hwdb.bin" ]; then
+    echo "$D/etc/udev/hwdb.bin was not generated"
+    exit 1
+fi