#!/bin/bash
#
# $Header: /var/cvsroot/gentoo-x86/sys-process/cronbase/files/run-crons-0.3.3,v 1.1 2009/04/14 06:13:36 bangert Exp $
#
# 12 Oct 2008; Thilo Bangert <bangert@gentoo.org> run-crons:
#     ignore emacs backup files (bug #237200)
#     include logging patch (bug #140869)
#
# 08 Mar 2005; Aaron Walker <ka0ttic@gentoo.org> run-crons:
#     Ignore the error messages from find caused by race conditions, since
#     we could care less about the error as long as the file has been removed.
#     See bug 8506.
#
# 06 May 2004; Aron Griffis <agriffis@gentoo.org> run-crons:
#     Make the locking actually work.  The old code was racy.
#     Thanks to Mathias Gumz in bug 45155 for some cleanups.
#
# 23 Jun 2002; Jon Nelson <jnelson@gentoo.org> run-crons:
#     fixed a race condition, where cron jobs and run-crons wanted to
#     delete touch files
#
# 20 Apr 2002; Thilo Bangert <bangert@gentoo.org> run-crons:
#     moved lastrun directory to /var/spool/cron/lastrun
#
# Author: Achim Gottinger <achim@gentoo.org>
#
# Mostly copied from SuSE
#
# 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

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


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
		GLOBIGNORE="*~"
		for SCRIPT in $CRONDIR/* ; do
			if [[ -x $SCRIPT && ! -d $SCRIPT ]]; then
				[ -x /usr/bin/logger ] && /usr/bin/logger -i -p cron.info -t run-crons "(`whoami`) CMD ($SCRIPT)"
				$SCRIPT
			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