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#!/bin/bash
# setupdate -- start or stop /usr/sbin/update
# setupdate 0 .......... stop
# setupdate 1 .......... start
# setupdate permit ..... change /etc/sudoers to allow anyone to run setupdate
# setupdate ............ report number of instances of 'update' running
# 26-Nov-2005 -- created (RFM)
# name of current command
THISCMD=$( basename $0 )
# function to count instances of 'update'
function updates_running () {
ps -acx | tr -s " " | sed 's/^ *//' | cut -d " " -f5 | grep "^update$" | wc -l ; }
# function to report usage
function usage() { printf "usage: %s [01]\n" $THISCMD ; }
# commands
STARTCMD='/usr/sbin/update'
STOPCMD='/usr/bin/killall update'
# count instances of 'update' running
RUNNING=$( updates_running )
# if no arguments, report number of 'update' processes running
if test $# -eq 0 ; then
printf "%d instance(s) of 'update' running\n" $RUNNING
exit 0
fi
# check number of arguments
if test $# -gt 1 ; then
printf "%s: invalid number of arguments\n" $THISCMD 1>&2
usage 1>&2
exit -1
fi
# print warning if multiple instances
if test $RUNNING -gt 1 ; then
printf "%s: warning -- %d instances of 'update' running\n" $THISCMD $RUNNING 1>&2
fi
# kill update
if test $1 = 0 ; then
# if any instances running, then kill them
if test $RUNNING -gt 0 ; then
# kill 'update'
sudo $STOPCMD
# check whether they're gone
RUNNING=$( updates_running )
if test $RUNNING -gt 0 ; then
printf "%s: warning -- tried to kill 'update', but %d instance(s) still running\n" $THISCMD $RUNNING 1>&2
exit -1
fi
fi
# printf "now %d instance(s) of 'update' running\n" $RUNNING
exit 0
# start update
elif test $1 = 1 ; then
# if none running, then start one
if test $RUNNING -eq 0 ; then
# start an 'update' process
sudo $STARTCMD
# check that it's running
RUNNING=$( updates_running )
if test $RUNNING -eq 0 ; then
printf "%s: warning -- tried to start 'update', but failed\n" $THISCMD 1>&2
exit -1
fi
fi
# printf "now %d instance(s) of 'update' running\n" $RUNNING
exit 0
# change /etc/sudoers to allow anyone to start or stop 'update'
elif test $1 = permit ; then
# see whether we have permission
eval 'echo "" >> /etc/sudoers' 2> /dev/null
if test $? -ne 0 ; then
printf "%s permit: error -- you must run this command as root\n" $THISCMD 1>&2
printf "e.g., sudo %s permit\n" $THISCMD 1>&2
exit -1
fi
echo "# allow anyone to start and stop the 'update' process" >> /etc/sudoers
echo "# (important for allowing MATLAB to stop disk writes during experiments)" >> /etc/sudoers
printf "# added by %s using '%s' script (%s)\n" $USER $THISCMD "$( date )" >> /etc/sudoers
printf "ALL ALL = NOPASSWD: %s\n" "$STARTCMD" >> /etc/sudoers
printf "ALL ALL = NOPASSWD: %s\n" "$STOPCMD" >> /etc/sudoers
echo "" >> /etc/sudoers
# invalid argument
else
printf "%s: invalid argument\n" $THISCMD 1>&2
usage 1>&2
exit -1
fi
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