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