#!/bin/sh
# Copyright © 2005-2007  Roger Leigh <rleigh@debian.org>
#
# schroot 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 3 of the License, or
# (at your option) any later version.
#
# schroot 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, see
# <http://www.gnu.org/licenses/>.
#
#####################################################################

set -e

. "$SETUP_DATA_DIR/common-data"
. "$SETUP_DATA_DIR/common-functions"
. "$SETUP_DATA_DIR/common-config"

if [ "$VERBOSE" = "verbose" ]; then
    LVM_VERBOSE="-v"
fi

if [ "$CHROOT_TYPE" = "lvm-snapshot" ]; then

    if [ $STAGE = "setup-start" ]; then

	if [ ! "$DEVTYPE" "$CHROOT_DEVICE" ]; then
	    fatal "Device '$CHROOT_DEVICE' does not exist"
	fi

	if [ "$VERBOSE" = "verbose" ]; then
	    lvcreate $LVM_VERBOSE --snapshot --name "$CHROOT_LVM_SNAPSHOT_NAME" \
		"$CHROOT_DEVICE" $CHROOT_LVM_SNAPSHOT_OPTIONS
	else
	    lvcreate $LVM_VERBOSE --snapshot --name "$CHROOT_LVM_SNAPSHOT_NAME" \
		"$CHROOT_DEVICE" $CHROOT_LVM_SNAPSHOT_OPTIONS > /dev/null
	fi

    elif [ $STAGE = "setup-stop" ]; then

	if [ "$DEVTYPE" "$CHROOT_LVM_SNAPSHOT_DEVICE" ]; then
            # The lock needs to be dropped immediately before
            # destroying the device.  There is a small race here, but
            # the lock can't be dropped once the device has been
            # removed.
	    info "Removing device lock for $CHROOT_LVM_SNAPSHOT_DEVICE, owned by pid $PID"
            "$LIBEXEC_DIR/schroot-releaselock" \
		--device="$CHROOT_LVM_SNAPSHOT_DEVICE" \
		--pid=$PID || true

	    if [ "$VERBOSE" = "verbose" ]; then
		lvremove $LVM_VERBOSE -f "$CHROOT_LVM_SNAPSHOT_DEVICE" || true
	    else
		lvremove $LVM_VERBOSE -f "$CHROOT_LVM_SNAPSHOT_DEVICE" > /dev/null || true
	    fi
	else
	    # The block device no longer exists, or was never created,
	    # for example on lvcreate failure.
	    warn "$CHROOT_LVM_SNAPSHOT_DEVICE does not exist (it may have been removed previously)"
	fi

    fi

fi