--- /dev/null
+#!/bin/sh
+#
+# check_system_crontabs.sh
+#
+# Script to check and see if any system (f)crontabs have changed, and if so
+# build a fcrontab file from /etc/crontab, /etc/fcrontab and files from
+# /etc/cron.d/ and notify fcron about the change.
+#
+# WARNING : - if you run this script, your system fcrontab will be overridden
+# by the content of /etc/crontab, /etc/fcrontab, /etc/cron.d :
+# save the content of your system fcrontab first if necessary.
+#
+# - you should not have the same lines in /etc/crontab
+# and /etc/fcrontab, in which case the jobs would get run twice.
+# (/etc/crontab may for example be used for Vixie-cron compatible
+# lines, and /etc/fcrontab for the other ones)
+#
+# - you must understand that the contents of all the mentionned
+# files will go to a single file : the system fcrontab.
+# This means that you should pay attention to the global option
+# settings and environment variable assignments, which may
+# affect the other files too while you thought it wouldn't.
+#
+# This script was originally created for a Debian server. A number of
+# Debian packages like to drop files in /etc/cron.d/ and it would be nice
+# to have something automatically create a system fcrontab file and notify
+# fcron when those files change, so the system administrator doesn't have
+# to try and keep up with it all manually.
+#
+# It is planned that such feature is integreated directly in fcron
+# in the future (in a cleaner and more efficient way). Until then,
+# this script should be useful.
+#
+# I recommend running this script using dnotify or a similar program
+# (dnotify wait for a change in a file or a directory, and run a command
+# when it happens), with a something like that:
+# dnotify -b -p 1 -q 0 -MCDR /etc /etc/cron.d -e /usr/local/sbin/check_system_crontabs
+# in your boot scripts.
+#
+# Because we don't want the system fcrontab to be generated every few seconds
+# if the sys admin is working in /etc/ (the script has probably been called
+# by dnotify because of a change in /etc, but it may be a file not related
+# to fcron), the script will by default sleep so as to avoid being run too
+# often. The default sleep time is 30 seconds, and can be adjusted by changing
+# DEFAULT_SLEEP_TIME_BEFORE_REBUILD below, or by passing -s X, where X is
+# the number of seconds to sleep. X can be 0.
+#
+# If you can't use dnotify, you should run this script from the system fcrontab
+# with a line like this:
+#
+# @ 1 /usr/local/sbin/check_system_crontabs -s 0
+#
+# To force an immediate rebuild at the commandline try:
+# check_system_crontabs -f -i
+#
+# For more help on command-line options:
+# check_system_crontabs -h
+#
+# Changelog
+# =========
+# Date Author Description
+# ---- ------ -----------
+# 2004/11/12 maasj@dm.org Original version
+# 2005/02/24 Thibault Godouet Modified to be used with dnotify
+# + bug fixes and enhancement.
+# 2005/04/27 Daniel Himler Security enhancements and cleanups.
+# 2005/09/14 Damon Harper Command lines options, cleanups.
+# 2010/03/10 Michal Gorny Removed bashisms for better portability.
+#
+
+##############################
+# DEFAULT CONFIGURATION
+
+DEFAULT_SLEEP_TIME_BEFORE_REBUILD=30
+DEFAULT_CROND_DIR=/etc/cron.d
+DEFAULT_CRONTAB_FILE=/etc/crontab
+DEFAULT_FCRONTAB_FILE=/etc/fcrontab
+
+FCRONTAB_PROG=/usr/bin/fcrontab
+FCRONTABS_DIR=/var/spool/fcron
+
+# END OF DEFAULT CONFIGURATION
+##############################
+
+FCRONTAB_FILE_TMP=
+
+cleanup() {
+ # remove temporary file (if any)
+ [ -e "$FCRONTAB_FILE_TMP" ] && rm -f "$FCRONTAB_FILE_TMP"
+}
+trap "eval cleanup" INT TERM HUP
+
+FCRONTAB_FILE_TMP="`mktemp /tmp/fcrontab.XXXXXX 2>/dev/null`"
+if [ $? -ne 0 ]; then
+ FCRONTAB_FILE_TMP=/tmp/fcrontab.$$
+fi
+
+info() {
+ [ -n "$VERBOSE" ] && echo "$@" >&2
+}
+
+die() {
+ echo check_system_crontabs: "$@" >&2
+ echo Try check_system_crontabs -h for help. >&2
+ exit 1
+}
+
+usage() {
+ cat <<_EOF_ >&2
+Description: Rebuild the systab file from various system crontabs.
+Usage: check_system_crontabs [options]
+ OPTIONS:
+ -v Verbose; tell what is happening.
+ -f Force rebuild, even if no changes are found.
+ -s SECONDS Sleep for SECONDS before rebuilding.
+ Default: $DEFAULT_SLEEP_TIME_BEFORE_REBUILD seconds.
+ -i Interactive use with no delay; same as -s 0.
+ -p PATHNAME Full path to or filename of the fcrontab binary; use this
+ only if it cannot be found automatically.
+ -F FILE System fcrontab file (default $DEFAULT_FCRONTAB_FILE).
+ -C FILE System crontab file (default $DEFAULT_CRONTAB_FILE).
+ -D DIR System crontab directory (default $DEFAULT_CROND_DIR).
+ -h This help text.
+_EOF_
+ exit
+}
+
+SLEEP_TIME_BEFORE_REBUILD="$DEFAULT_SLEEP_TIME_BEFORE_REBUILD"
+CROND_DIR="$DEFAULT_CROND_DIR"
+CRONTAB_FILE="$DEFAULT_CRONTAB_FILE"
+FCRONTAB_FILE="$DEFAULT_FCRONTAB_FILE"
+FCRONTAB_PROG=
+VERBOSE=
+FORCE=
+
+# read command line arguments
+while [ $# -gt 0 ]; do
+ case "$1" in
+ -v)
+ VERBOSE=true
+ ;;
+ -f)
+ FORCE=true
+ ;;
+ -s)
+ SLEEP_TIME_BEFORE_REBUILD="$2"
+ shift
+ ;;
+ -i)
+ SLEEP_TIME_BEFORE_REBUILD=0
+ ;;
+ -p)
+ FCRONTAB_PROG="$2"
+ shift
+ ;;
+ -F)
+ FCRONTAB_FILE="$2"
+ shift
+ ;;
+ -C)
+ CRONTAB_FILE="$2"
+ shift
+ ;;
+ -D)
+ CROND_DIR="$2"
+ shift
+ ;;
+ -h)
+ usage
+ ;;
+ *)
+ die "Invalid option: $1!"
+ ;;
+ esac
+ shift
+done
+
+# find fcrontab executable path
+if [ -n "$FCRONTAB_PROG" ]; then
+ [ -d "$FCRONTAB_PROG" ] && FCRONTAB_PROG="$FCRONTAB_PROG/fcrontab"
+ [ ! -x "$FCRONTAB_PROG" ] && die "Invalid fcrontab executable or path specified with -p!"
+else
+ fcrontab -V 2>/dev/null
+ if [ $? -eq 0 ]; then
+ FCRONTAB_PROG=fcrontab
+ elif [ -x /usr/bin/fcrontab ]; then
+ FCRONTAB_PROG=/usr/bin/fcrontab
+ elif [ -x /usr/local/bin/fcrontab ]; then
+ FCRONTAB_PROG=/usr/local/bin/fcrontab
+ else
+ die "Unable to locate fcrontab binary! Specify with -p."
+ fi
+fi
+
+# sanity check
+if [ -z "$CROND_DIR" -o -z "$CRONTAB_FILE" -o -z "$FCRONTAB_FILE" ]; then
+ die "Must specify all system crontab files."
+fi
+
+# Function to build up a system crontab and tell fcron it's changed
+rebuild_and_notify()
+{
+ logger -i -p cron.notice -t "check_system_crontabs" "Rebuilding the system fcrontab..."
+
+ # put a warning message at the top of the file
+ cat <<_EOF_ > "$FCRONTAB_FILE_TMP"
+########################################
+# WARNING!!! DO NOT EDIT THIS FILE!!! #
+########################################
+# Do not edit this file! It is automatically generated from
+# the $CRONTAB_FILE, the $FCRONTAB_FILE and $CROND_DIR/* files whenever one of
+# those files is changed.
+#
+
+_EOF_
+
+ # include the standard system crontab file if it exists and is not a symbolic link
+ if [ -f "$CRONTAB_FILE" -a ! -L "$CRONTAB_FILE" ]; then
+ cat - "$CRONTAB_FILE" <<_EOF_ >> "$FCRONTAB_FILE_TMP"
+
+
+########################################
+# $CRONTAB_FILE
+########################################
+
+_EOF_
+ fi
+
+ # print a nice filename header for each file in /etc/cron.d/
+ # and include its contents into the new fcron system crontab
+ for i in "$CROND_DIR"/* ; do
+ if [ -r "$i" -a ! -d "$i" -a "$i" = "${i%\~}" ]; then
+ cat - "$i" <<_EOF_ >> "$FCRONTAB_FILE_TMP"
+
+
+########################################
+# $i
+########################################
+
+_EOF_
+ fi
+ done
+
+ # include the system fcrontab file if it exists and is not a symbolic link
+ if [ -f "$FCRONTAB_FILE" -a ! -L "$FCRONTAB_FILE" ]; then
+ cat - "$FCRONTAB_FILE" <<_EOF_ >> "$FCRONTAB_FILE_TMP"
+
+
+########################################
+# $FCRONTAB_FILE
+########################################
+
+_EOF_
+ fi
+
+ # Replace "@hourly" style Vixie cron extensions which fcron doesn't parse
+ sed -i -e "s/@yearly/0 0 1 1 */g" -e "s/@annually/0 0 1 1 */g" -e "s/@monthly/0 0 1 * */g" -e "s/@weekly/0 0 * * 0/g" -e "s/@daily/0 0 * * */g" -e "s/@midnight/0 0 * * */g" -e "s/@hourly/0 * * * */g" "$FCRONTAB_FILE_TMP"
+
+ # notify fcron about the updated file
+ "$FCRONTAB_PROG" "$FCRONTAB_FILE_TMP" -u systab
+}
+
+NEED_REBUILD=0
+
+# by default, sleep to avoid too numerous executions of this script by dnotify.
+if [ -n "$SLEEP_TIME_BEFORE_REBUILD" -a "$SLEEP_TIME_BEFORE_REBUILD" != 0 ]; then
+ if ! sleep $SLEEP_TIME_BEFORE_REBUILD; then
+ # sleep time was invalid or sleep interrupted by signal!
+ cleanup
+ exit 1
+ fi
+fi
+
+# First check if we're forcing a rebuild:
+if [ -n "$FORCE" ]; then
+
+ NEED_REBUILD=1
+
+else
+
+ if [ -d "$CROND_DIR" ]; then
+
+ # This test works for file creation/deletion (deletion is not detected
+ # by the next test)
+ if [ -n "$(find "$CROND_DIR" -prune -type d -newer "$FCRONTABS_DIR"/systab.orig 2>/dev/null)" ]; then
+
+ info "Changes detected in $CROND_DIR"
+ NEED_REBUILD=1
+
+ else
+
+ # Test each one and see if it's newer than our timestamp file
+ if [ -n "$(find "$CROND_DIR"/* -prune -type f ! -name '*~' -newer "$FCRONTABS_DIR"/systab.orig 2>/dev/null)" ]; then
+
+ info "Changes detected in $CROND_DIR"
+ NEED_REBUILD=1
+
+ fi
+
+ fi
+
+ fi
+
+ # Test the standard /etc/crontab and /etc/fcrontab files and see if they have changed
+ REBUILD_TMPSTR="$(find "$CRONTAB_FILE" "$FCRONTAB_FILE" -prune -type f -newer "$FCRONTABS_DIR"/systab.orig -exec echo "{}" ';' 2>/dev/null)"
+ if [ -n "${REBUILD_TMPSTR}" ]; then
+
+ info "Changes detected in: ${REBUILD_TMPSTR}"
+ NEED_REBUILD=1
+
+ fi
+
+fi
+
+if [ $NEED_REBUILD -eq 1 ]; then
+
+ info "Rebuilding fcron systab."
+ rebuild_and_notify
+
+elif [ -n "$VERBOSE" ]; then
+
+ info "Not rebuilding fcron systab; no changes found."
+
+fi
+
+cleanup
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