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229 lines
7.3 KiB
Plaintext
229 lines
7.3 KiB
Plaintext
# shutdown2 - functions to save the overlay to a compressed archive
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#
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# Author: Michael Towers (larch42 at googlemail dot com)
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#
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# This file is part of the larch project.
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#
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# larch 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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# larch 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 larch; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#
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#----------------------------------------------------------------------------
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# 2009.09.22
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# This function can be called before the proper shutdown, in order to
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# gather information concerning the session saving. In that case, also
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# 'autocheckse' should/could be called to save it in condensed form so
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# that the actual shutdown script doesn't need to repeat the 'checkse' call.
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checkse ()
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{
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############################# Deal with ejecting
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# See if boot device still mounted and ejectable (CD/DVD)
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bootdev=$( cat /.livesys/bootdevice )
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ejectdev=''
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savedev=${bootdev}
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if [ -f /proc/sys/dev/cdrom/info ]; then
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cdroms=$( cat /proc/sys/dev/cdrom/info | { while read a b c; do
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if [ "${a}" = "drive" -a "${b}" = "name:" ]; then
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echo "${c}"
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break
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fi
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done
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} )
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for d in ${cdroms}; do
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if [ "/dev/${d}" = "${bootdev}" ]; then
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# booted from CD/DVD, by default no session-save possible
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savedev=''
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if grep "^${bootdev} " /proc/mounts &>/dev/null; then
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# it needs to be ejected
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ejectdev=${bootdev}
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fi
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break
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fi
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done
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fi
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############################# Deal with session saving
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savepath=/.livesys/medium
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savemount="${savepath}"
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dontask=""
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merge=""
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if [ -f ${savepath}/larch/session-save0 ]; then
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. ${savepath}/larch/session-save0
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fi
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if [ -n "${savedev}" ] && [ -f "${savepath}/larch/save" ]; then
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saving="yes"
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else
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saving=""
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fi
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}
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# Create a file with all the information for guiding session-saving and
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# device ejection at shutdown
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autocheckse ()
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{
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xfile=/tmp/checkse
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:>${xfile}
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echo "bootdev=\"${bootdev}\"" >>${xfile}
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echo "ejectdev=\"${ejectdev}\"" >>${xfile}
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echo "savedev=\"${savedev}\"" >>${xfile}
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echo "savemount=\"${savemount}\"" >>${xfile}
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echo "savepath=\"${savepath}\"" >>${xfile}
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echo "dontask=\"${dontask}\"" >>${xfile}
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echo "merge=\"${merge}\"" >>${xfile}
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echo "saving=\"${saving}\"" >>${xfile}
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}
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# This is the entry point for steering the session saving.
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# It determines what sort of session saving is to be done and calls
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# 'dosaving' to perform the actual saving operation.
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session_save ()
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{
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overlaypath=${savepath}/larch
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if [ -f ${overlaypath}/save-menu ]; then
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. ${overlaypath}/save-menu
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elif [ -f /tmp/xlogout ]; then
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if grep "-" /tmp/xlogout &>/dev/null; then
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savedev=""
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elif grep "M" /tmp/xlogout &>/dev/null; then
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merge="yes"
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fi
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elif [ -z "${dontask}" ]; then
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echo
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echo "============= Session Saving ============="
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echo
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echo "Please select:"
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echo "--------------"
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echo
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echo " <Enter>: Save overlay"
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echo " 1 <Enter>: Merge overlays"
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echo " 2 <Enter>: No session saving"
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read -p "Choice? :" choice
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case ${choice} in
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1 ) merge="yes" ;;
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2 ) savedev="" ;;
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* ) ;;
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esac
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fi
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if [ -n "${savedev}" ]; then
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dosaving
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res=$?
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${unmount}
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return ${res}
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fi
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}
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# Perform the session saving, handling simple recompression by calling
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# 'saveovl' (function), and calling 'merge_overlay' (script) to handle
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# overlay merging.
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dosaving()
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{
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# Check whether initramfs and/or kernel have been updated, and
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# write to medium if necessary.
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if [ -f /boot/larchnew.img ]; then
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if ! mount -n -o remount,rw /.livesys/medium; then
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echo "ERROR: New initramfs - couldn't mount boot device rw"
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return 1
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fi
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if [ -f /.livesys/medium/syslinux/larch.kernel ]; then
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sdir=/.livesys/medium/syslinux
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else
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sdir=/.livesys/medium/boot
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fi
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mount -n -o remount,rw /
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mv /boot/larchnew.img ${sdir}/larch.img
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vmlinuz="$( cat /.livesys/medium/larch/kernelname )"
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[ -f /boot/${vmlinuz} ] && mv /boot/${vmlinuz} ${sdir}/larch.kernel
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mount -n -o remount,ro /.livesys/medium
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mount -n -o remount,ro /
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fi
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if cat /proc/mounts | \
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grep "^${savedev} ${savemount} " &>/dev/null; then
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mount -n -o remount,rw ${savemount}
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unmount="mount -n -o remount,ro ${savemount}"
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else
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mount -n ${savedev} ${savemount}
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unmount="umount -n ${savemount}"
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fi
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# Save autologin user
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mkdir -p ${overlaypath}/copy
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if [ -f /tmp/newuser ]; then
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cat /tmp/newuser >${overlaypath}/copy/autologin
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else
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:> ${overlaypath}/copy/autologin
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fi
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if [ $? -ne 0 ]; then
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echo "ERROR: Couldn't save autologin user"
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return 1
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fi
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rm -f ${overlaypath}/overlay.ovl~
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if [ -n "${merge}" ]; then
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rm -f ${overlaypath}/mods.sqf~
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if /opt/larch/session-save/merge_overlay ${overlaypath}; then
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echo "Renaming mods.tmp to mods.sqf_"
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mv "${overlaypath}/mods.tmp" "${overlaypath}/mods.sqf_"
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echo "Renaming filter.tmp to filter.sqf_"
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mv "${overlaypath}/filter.tmp" "${overlaypath}/filter.sqf_"
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if [ -f "${overlaypath}/overlay.tar.lzo" ]; then
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echo "Backing up overlay file, ${overlaypath}/overlay.tar.lzo"
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mv "${overlaypath}/overlay.tar.lzo" "${overlaypath}/overlay.tar.lzo~"
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fi
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return 0
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fi
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# If we land here, merging failed
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echo "Trying to recover by just saving overlay"
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fi
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saveovl
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}
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saveovl ()
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{
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utype="$( cat /.livesys/utype )"
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if [ "${utype}" = "aufs" ]; then
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# flush pseudo-links (which keep track of changed hard linked files)
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auplink / flush
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fi
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savedirs=''
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for d in bin boot etc home lib mnt opt root sbin srv usr var; do
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if [ -d /.livesys/overlay/${d} ]; then
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savedirs="${savedirs} overlay/${d}"
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fi
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done
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excludes="--exclude=/var/log --exclude=/var/tmp"
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excludes="${excludes} --exclude=/var/cache/pacman/pkg"
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echo "Recompressing overlay"
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tar -cf - ${excludes} -C /.livesys ${savedirs} | \
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lzop > ${overlaypath}/overlay.tar.lzo_
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if [ $? -ne 0 ]; then
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echo "ERROR: couldn't save overlay"
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rm -f ${overlaypath}/overlay.tar.lzo_
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return 1
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fi
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mv -b "${overlaypath}/overlay.tar.lzo_" "${overlaypath}/overlay.tar.lzo"
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}
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