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#!/bin/bash
# Copyright 1999-2015 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
#
# this script looks into /etc/cron.[hourly|daily|weekly|monthly]
# for scripts to be executed. The info about last run is stored in
# /var/spool/cron/lastrun
LOCKDIR=/var/spool/cron/lastrun
LOCKFILE=${LOCKDIR}/lock
# Usage: log <level> <args to logger>
# Log a message via syslog.
log() {
local level=$1
shift
logger -i -p "cron.${level}" -t run-crons "$@"
}
mkdir -p ${LOCKDIR}
# Make sure we're not running multiple instances at once.
# Try twice to lock, otherwise give up.
for ((i = 0; i < 2; i = i + 1)); do
ln -sn $$ ${LOCKFILE} 2>/dev/null && break
# lock failed, check for a running process.
# handle both old- and new-style locking.
cronpid=$(readlink ${LOCKFILE} 2>/dev/null) ||
cronpid=$(cat ${LOCKFILE} 2>/dev/null) ||
continue # lockfile disappeared? try again
# better than kill -0 because we can verify that it's really
# another run-crons process
if [[ $(</proc/${cronpid}/cmdline) == $(</proc/$$/cmdline) ]] 2>/dev/null; then
# whoa, another process is really running
exit 0
else
rm -f ${LOCKFILE}
fi
done
# Check to make sure locking was successful
if [[ ! -L ${LOCKFILE} ]]; then
echo "Can't create or read existing ${LOCKFILE}, giving up"
exit 1
fi
# Set a trap to remove the lockfile when we're finished
trap "rm -f ${LOCKFILE}" 0 1 2 3 15
EXIT_STATUS=0
for BASE in hourly daily weekly monthly ; do
CRONDIR=/etc/cron.${BASE}
test -d $CRONDIR || continue
if [ -e ${LOCKDIR}/cron.$BASE ] ; then
case $BASE in
hourly)
#>= 1 hour, 5 min -=> +65 min
TIME="-cmin +65" ;;
daily)
#>= 1 day, 5 min -=> +1445 min
TIME="-cmin +1445" ;;
weekly)
#>= 1 week, 5 min -=> +10085 min
TIME="-cmin +10085" ;;
monthly)
#>= 31 days, 5 min -=> +44645 min
TIME="-cmin +44645" ;;
esac
find ${LOCKDIR} -name cron.$BASE $TIME -exec rm {} \; &>/dev/null || true
fi
# if there is no touch file, make one then run the scripts
if [ ! -e ${LOCKDIR}/cron.$BASE ] ; then
touch ${LOCKDIR}/cron.$BASE
set +e
for SCRIPT in $CRONDIR/* ; do
if [[ -x $SCRIPT && ! -d $SCRIPT ]]; then
# Filter out files people do not expect to be executed.
case ${SCRIPT} in
.*|*~) continue ;;
esac
log info "($(whoami)) CMD (${SCRIPT})"
$SCRIPT
ret=$?
if [ ${ret} -ne 0 ] ; then
log err "CMD (${SCRIPT}) failed with exit status ${ret}"
EXIT_STATUS=1
fi
fi
done
fi
done
# Clean out bogus cron.$BASE files with future times
touch ${LOCKDIR}
find ${LOCKDIR} -newer ${LOCKDIR} -exec /bin/rm -f {} \; &>/dev/null || true
exit ${EXIT_STATUS}
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