Write metadata for the rootfs itself into the rootfs

This makes it easier to identify what version of a system we are running.

Tests are updated to check inside the contents of the rootfs we created,
and the code to mount the rootfs as a loopback device was extracted out
into tests.as-root/lib

1 files changed, 35 insertions, 0 deletions

diff --git a/tests.as-root/lib b/tests.as-root/lib
new file mode 100644
index 00000000..ec5e52f9
--- /dev/null
+++ b/tests.as-root/lib
@@ -0,0 +1,35 @@
+#!/bin/sh
+#
+# Copyright (C) 2012  Codethink Limited
+#
+# 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; version 2 of the License.
+#
+# 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.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+# Helper functions for as-root tests
+
+loopback_rootfs() {
+    # Find offset partition offset in a rootfs and mount it
+    ROOTFS="$1"
+
+    mv $ROOTFS $ROOTFS-unzipped.gz
+    gunzip $ROOTFS-unzipped.gz
+
+    OFFSET=$(sfdisk -d $ROOTFS-unzipped | \
+        grep -m 1 -o 'start=\s\+\([0-9]\+\)' | awk '{ print $2 }')
+    OFFSET=$(expr $OFFSET '*' 512)
+
+    DEVICE=$(losetup --show -o "$OFFSET" -f "$ROOTFS-unzipped")
+    udevadm settle
+
+    echo $DEVICE
+}