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#!/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"

    PYTHONPATH="$SRCDIR" "$SRCDIR/scripts/sparse-gunzip" \
                         <"$ROOTFS" >"$ROOTFS-unzipped"

    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"
}