void-packages/templates/xbps-casper/files/bin/casper-snapshot

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#! /bin/bash
# casper-snapshot - utility to manage Debian Live systems snapshots
#
# This program mount a device (fallback to /tmpfs under /mnt/snapshot
# and save the /cow (or a different dir) filesystem in it for reusing
# in another casper session. Look at manpage for more info.
#
# Copyright (C) 2006 Marco Amadori <marco.amadori@gmail.com>
#
# 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# On Debian systems, the complete text of the GNU General Public License
# can be found in /usr/share/common-licenses/GPL file.
PROGRAM="`basename $0`"
VERSION=0.0.1
# Source casper conf
if [ -e /etc/casper.conf ]; then
. /etc/casper.conf
else
USERNAME=$(cat /etc/passwd | grep "999" | cut -f1 -d ':')
HOSTNAME=$(hostname)
BUILD_SYSTEM="Debian"
fi
export USERNAME USERFULLNAME HOSTNAME BUILD_SYSTEM
# Source helper functions
helpers="/usr/share/initramfs-tools/scripts/casper-helpers"
if [ -e "${helpers}" ]; then
. "${helpers}"
else
echo "Error: I cannot found helper functions \"${helpers}\"."
exit 1
fi
# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions
MOUNTP=""
COW=""
DEV=""
DEST=""
TYPE=""
DESKTOP_LINK=""
Header ()
{
echo "${PROGRAM} - utility to do Debian Live snapshots"
echo
echo "Usage: ${PROGRAM} [-c|--cow DIRECTORY] [-d|--device DEVICE] [-o|--output FILE] [-t|--type TYPE]"
echo "Usage: ${PROGRAM} [-r|--resync-string STRING]"
echo "Usage: ${PROGRAM} [-h|--help]"
echo "Usage: ${PROGRAM} [-u|--usage]"
echo "Usage: ${PROGRAM} [-v|--version]"
}
Usage ()
{
MESSAGE=${1}
Header
echo
echo "Try \"${PROGRAM} --help\" for more information."
if [ ! -z "${MESSAGE}" ]; then
echo -e "${MESSAGE}"
exit 1
else
exit 0
fi
}
Help ()
{
Header
echo
echo "Options:"
echo " -c, --cow: specifies the copy on write directory (default: /cow)."
echo " -d, --device: specifies the output snapshot device (default: none)."
echo " -o, --output: specifies the output image file (default: $type dependent)."
echo " -r, --resync-string: internally used to resync previous made snapshots."
echo " -t, --type: specifies the snapshot type between \"squashfs\", \"ext2\" or \"cpio\".gz archive (default: cpio)"
echo -e "\nLook at casper-snapshot(1) man page for more information."
exit 0
}
Version ()
{
echo "${PROGRAM}, version ${VERSION}"
echo
echo "Copyright (C) 2006 Marco Amadori <marco.amadori@gmail.com>"
echo
echo "This program is free software; you can redistribute it and/or modify"
echo "it under the terms of the GNU General Public License as published by"
echo "the Free Software Foundation; either version 2 of the License, or"
echo "(at your option) any later version."
echo
echo "This program is distributed in the hope that it will be useful,"
echo "but WITHOUT ANY WARRANTY; without even the implied warranty of"
echo "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the"
echo "GNU General Public License for more details."
echo
echo "You should have received a copy of the GNU General Public License"
echo "along with this program; if not, write to the Free Software"
echo "Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA"
echo
echo "On Debian systems, the complete text of the GNU General Public License"
echo "can be found in /usr/share/common-licenses/GPL file."
echo
echo "Homepage: <http://live.debian.net/>"
exit 0
}
Do_snapshot ()
{
case "${TYPE}" in
squashfs)
echo "./tmp/exclude_list" > /tmp/exclude_list
( cd "${COW}" && find . -name '*.wh.*' >> /tmp/exclude_list )
mksquashfs "${COW}" "${DEST}" -ef /tmp/exclude_list || exit 1
rm /tmp/exclude_list
;;
cpio)
( cd "${COW}" && find . -path '*.wh.*' -prune -o -print0 | cpio --quiet -o0 -H newc | gzip -9c > "${DEST}" ) || exit 1
;;
ext2)
DU_DIM="`du -ks ${COW} | cut -f1`"
REAL_DIM="`expr ${DU_DIM} + ${DU_DIM} / 20`" # Just 5% more to be sure, need something more sophistcated here...
genext2fs --size-in-blocks=${REAL_DIM} --reserved-percentage=0 --root="${COW}" "${DEST}" || exit 1
;;
*)
echo "Internal error."
exit 1
;;
esac
}
Is_same_mount ()
{
dir1="`Base_path $1`"
dir2="`Base_path $2`"
if [ "${dir1}" == "${dir2}" ]; then
return 0
else
return 1
fi
}
Parse_args ()
{
# Parse command line
ARGUMENTS="`getopt --longoptions cow:,device:,output,resync-string:,type:,help,usage,version --name=${PROGRAM} --options c:d:o:t:r:,h,u,v --shell sh -- "$@"`"
if [ "$?" != "0" ]; then
echo "Terminating." >&2
exit 1
fi
eval set -- "${ARGUMENTS}"
while true; do
case "$1" in
-c|--cow)
SNAP_COW="$2"; shift 2 ;;
-d|--device)
SNAP_DEV="$2"; shift 2 ;;
-o|--output)
SNAP_OUTPUT="$2"; shift 2 ;;
-t|--type)
SNAP_TYPE="$2"; shift 2 ;;
-r|--resync-string)
SNAP_RSTRING="$2"; break ;;
-h|--help)
Help; shift ;;
-u|--usage)
Usage ; shift ;;
-v|--version)
Version; shift ;;
--)
shift; break ;;
*)
echo "Internal error."; exit 1 ;;
esac
done
}
Mount_device ()
{
dev="$1"
if [ ! -d "${MOUNTP}" ]; then
mkdir -p "${MOUNTP}"
fi
if [ -z "${dev}" ]; then
# create a temp
mount -t tmpfs -o rw tmpfs "${MOUNTP}"
if [ ! -L /home/$USERNAME/Desktop/casper-snapshot ]; then
ln -s "${MOUNTP}" /home/$USERNAME/Desktop/casper-snapshot
fi
else
if [ -b "${dev}" ] ; then
try_mount "${dev}" "${MOUNTP}" rw
fi
fi
}
Defaults ()
{
MOUNTP="/mnt/casper-snapshot"
COW="/cow"
DEV=""
TYPE="cpio"
DESKTOP_LINK=/home/$USERNAME/Desktop/casper-snapshot
if [ -n "${SNAP_RSTRING}" ]; then
COW=$(echo "${SNAP_RSTRING}" | cut -f1 -d ':')
DEV=$(echo "${SNAP_RSTRING}" | cut -f2 -d ':')
DEST="${MOUNTP}/$(echo "${SNAP_RSTRING}" | cut -f3 -d ':')"
case "${DEST}" in
*.cpio.gz)
TYPE="cpio" ;;
*.squashfs)
TYPE="squashfs" ;;
"")
TYPE="ext2" ;;
*.ext2)
TYPE="ext2" ;;
*)
Usage "Unrecognized String" ;;
esac
else
DEF_COW="/cow"
# Bad options handling
if [ -z "${SNAP_COW}" ]; then
COW="${DEF_COW}"
else
COW="${SNAP_COW}"
fi
case "${SNAP_TYPE}" in
"cpio"|"squashfs"|"ext2")
TYPE="${SNAP_TYPE}"
;;
"")
TYPE="cpio" ;;
*)
Usage "Error: unrecognized snapshot type"
;;
esac
case "${TYPE}" in
cpio)
DEST="${MOUNTP}/casper-sn.cpio.gz" ;;
squashfs)
DEST="${MOUNTP}/casper-sn.squashfs" ;;
ext2)
DEST="${MOUNTP}/casper-sn.ext2" ;;
*)
echo "Internal error."
exit 1
;;
esac
#if [ -d
#if Is_same_mount
fi
# check vars
if [ ! -d "${COW}" ]; then
Usage "Error: ${COW} is not a directory"
fi
Mount_device $DEV
}
Clean ()
{
if [ -n "$DEV" ]; then
umount "${MOUNTP}"
rmdir "${MOUNTP}"
rm
fi
}
Main ()
{
Parse_args "$@"
Defaults
Do_snapshot
Clean
}
Main "$@"