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|
#!/bin/sh
# casper-snapshot - utility to do Debian Live systems snapshots
#
# This program mount a /tmpfs under ~/Desktop and save the /cow
# filesystem in it for reusing in another session.
#
# 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 ${0}`"
VERSION=0.0.1
# Source casper conf
if [ -e /etc/casper.conf ]; then
. /etc/casper.conf
else
USERNAME=`cat /etc/passwd | grep "999" | cut -f1 -d ':'`
fi
Header ()
{
echo "${PROGRAM} - utility to do Debian Live snapshots"
echo
echo "Usage: ${PROGRAM} [-c|--cow DIRECTORY] [-d|--dest DIRECTORY] [-o|--output FILE] [-t|--type TYPE]"
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, --destination: specifies the output snapshot directory (default: /home/\$USERNAME/Desktop/casper-snapshot)."
echo " -o, --output: specifies the output image file (default: $type dependent)."
echo " -t,--type: specifies the snapshot type between \'squashfs\', \'ext2\' or \'cpio\'.gz archive (default: cpio)"
exit 0
}
Version ()
{
echo "${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-blocks=0 --root="${COW}" "${DEST}" || exit 1
;;
*)
echo "Internal error."
exit 1
;;
esac
}
Lastline()
{
while read lines ; do
line=${lines}
done
echo "${line}"
}
Base_path ()
{
testpath="${1}"
mounts="`awk '{print $2}' /proc/mounts`"
testpath="`realpath ${testpath}`"
while true ; do
if echo "${mounts}" | grep -qs "^${testpath}" ; then
set -- `echo "${mounts}" | grep "^${testpath}" | Lastline`
echo ${1}
break
else
testpath=`dirname $testpath`
fi
done
}
Is_same_mount ()
{
dir1="`Base_path ${1}`"
dir2="`Base_path ${2}`"
if [ "${dir1}" == "${dir2}" ]; then
return 0
else
return 1
fi
}
Parse_args ()
{
# Parse command line
ARGS="${1}"
ARGUMENTS="`getopt --longoptions cow:,destination:,output:,type:,help,usage,version --name=${PROGRAM} --options c:d:o:t:,h,u,v --shell sh -- ${ARGS}`"
if [ "${?}" != "0" ]; then
echo "Terminating." >&2
exit 1
fi
eval set -- "${ARGUMENTS}"
while true; do
case "${1}" in
-c|--cow)
SNAP_COW="${2}"; shift 2 ;;
-d|--destination)
SNAP_DEST="${2}"; shift 2 ;;
-o|--output)
SNAP_OUTPUT="${2}"; shift 2 ;;
-t|--type)
SNAP_TYPE="${2}"; shift 2 ;;
-h|--help)
Help; shift ;;
-u|--usage)
Usage ; shift ;;
-v|--version)
Version; shift ;;
--)
shift; break ;;
*)
echo "Internal error."; exit 1 ;;
esac
done
}
Defaults ()
{
DEF_COW="/cow"
# Bad options handling
if [ -z "${SNAP_COW}" ]; then
COW="${DEF_COW}"
else
COW="${SNAP_COW}"
fi
if [ ! -d "${COW}" ]; then
Usage "Error: ${COW} is not a directory"
fi
case "${SNAP_TYPE}" in
"cpio"|"squashfs"|"ext2")
TYPE="${SNAP_TYPE}"
;;
"")
TYPE="cpio" ;;
*)
Usage "Error: unrecognized snapshot type"
;;
esac
#if [ -d
#if Is_same_mount
}
Main ()
{
Parse_args "${@}"
Defaults
Do_snapshot
}
Main "${@}"
|
