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check_system_crontabs.sh
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check_system_crontabs.sh
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#!/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.
# 2008/07/23 Wolfram Schlich Patch to allow to specify a fcron.conf file
# 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
DEFAULT_FCRON_CONFIG_FILE=/etc/fcron/fcron.conf
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.
-c FILE Full path to fcron config file (default $DEFAULT_FCRON_CONFIG_FILE).
-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="$DEFAULT_CROND_DIR"
FCRON_CONFIG_FILE="$DEFAULT_FCRON_CONFIG_FILE"
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
;;
-c)
FCRON_CONFIG_FILE="$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
"$FCRONTAB_PROG" -c "$FCRON_CONFIG_FILE" "$FCRONTAB_FILE_TMP" -u systab
}
NEED_REBUILD=0
# by default, sleep to avoid too numerous executions of this script by dnotify.
if [ -n "$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