diff options
Diffstat (limited to 'bin/casper-snapshot')
| -rw-r--r-- | bin/casper-snapshot | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/bin/casper-snapshot b/bin/casper-snapshot new file mode 100644 index 0000000..d49034c --- /dev/null +++ b/bin/casper-snapshot @@ -0,0 +1,226 @@ +#!/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 ${1}`" +VERSION=0.0.1 + +# Source casper conf +if [ -e /etc/casper.conf ]; then + . /etc/casper.conf +else + USERNAME=`cat /etc/passwd | grep "999" | cut -f1 -d ':'` +fi + +Header () +{ + echo "${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) + mksquashfs "${COW}" "${DEST}" || exit 1 + ;; + cpio) + (cd "${COW}" && find . | cpio --quiet -o -H newc | gzip -9 > "${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}" == "${dir2}" ]; then + return 0 + else + return 1 + fi +} + +Parse_args () +{ + # Parse command line + ARGUMENTS="`getopt --longoptions cow:,destination:,output:,type:,help,usage,version --name=${PROGRAM} --options c:d:o:t:,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="${2}"; shift 2 ;; + -d|--destination) + SNAP_DEST="${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: ${COW} is not a directory\nMaybe you booted with \"hide-cow\" as kernel parameter?" + fi + + case "${SNAP_TYPE}" in + "cpio"|"squashfs"|"ext2") + TYPE="${SNAP_TYPE}" + ;; + "") + TYPE="cpio" ;; + *) + Usage "Error: unrecognized snapshot type" + ;; + esac +} + +Main () +{ + Parse_args "${@}" + Defaults + Do_snapshot +} + +Main "${@}" |