WDef
Group: Members
Posts: 798
Joined: Sep. 2005 |
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Posted: July 13 2006,10:35 |
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'shutdown' isn't running by that stage, init 0 has already been called (doh). Can get out of shutdown by changing runlevels (see below).
A flag could be set somewhere (eg /etc/sysconfig) to prevent a restore from occuring when runlevel 5 starts up again, otherwise some files which were changed during the session might get overwritten by the restore.
Function call:
| Code Sample | .
(snip)
trap failed SIGTERM
if [ $1 == "backup" ]; then
check_sufficient_space
(snip) |
Skip restore if backup had been aborted:
| Code Sample | (snip)
if [ $1 == "restore" ]; then
if [ -e /etc/sysconfig/abortedbackup ]; then
sudo rm -f /etc/sysconfig/abortedbackup
else
if [ -f /etc/sysconfig/des ]; then
TARGETFILE="backup.des"
(snip)
.
.
(snip)
echo "${BLUE}Done.${NORMAL}"
fi
fi
clean_up 0
fi
echo "I don't understand the command line parameter: $1"
(snip)
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Function:
| Code Sample |
check_sufficient_space(){
TARERR=/tmp/tarerr.$$
tar -C / -T $HOME/.filetool.lst -X $HOME/.xfiletool.lst --totals -cf - 1>/dev/null 2>${TARERR}
ARCHSIZE=$(awk '/Total bytes written/{print $4}' ${TARERR} )
rm -rf ${TARERR}
if [ $ARCHSIZE -eq 0 ]; then echo "Nothing to backup?"; clean_up; fi
(( ARCHK=ARCHSIZE/1000 )) # want kB
(( ARCHSIZEK = ARCHK + 1 )) # round upwards
FREESPACE=$(df -k $MOUNTPOINT | awk '/dev/{print $4}')
echo "Max upper bound on backup size = $ARCHSIZEK kB"
echo "Available space on $MOUNTPOINT = $FREESPACE kB"
if [ $ARCHSIZEK -ge $FREESPACE ]; then
a=$(runlevel)
if [ ${a#*[ ]} -eq 5 ]; then
# Backing up from gui
:
# ------- eg flua GUI goes here which just exits script if user aborts backup -------------
else
# We are in shutdown/reboot
echo "WARNING: there may be insufficient space on $MOUNTPOINT for backup."
while true; do
echo -n "Proceed anyway? (y/n) "
read ANS
case $ANS in
n|N|n*|N*) echo "Aborting backup/shutdown .."
if [ $MOUNTED == "no" ]; then
sudo umount $MOUNTPOINT
fi
sudo touch /etc/sysconfig/abortedbackup
exec >/dev/null # prevents trapped "failed" message when init kills this script
sudo telinit ${a%[ ]*};; # back to previous runlevel (normally 5 )
y|Y|y*|Y*) break;;
*) echo "Invalid response.";;
esac
done
fi
fi
}
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If anyone feels like testing the above that might be useful.
Another method (if switching runlevels about turns out to have problems) might be to move backup/restore out of the shutdown scripts altogether, and instead run filetool.sh from exitcheck.sh, before shutdown is called. However this means that (for eg) if a shutdown is initiated by some means other than the menu (eg CNTRL-ALT-DEL), a backup will not occur at all, so imho this is not preferable.
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