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#!/usr/bin/env bash
# /nightlies/cron_wrapper.sh
# check for no argument case and stop
if [ -z $1 ]; then
echo "need argument"
exit 1
fi
# set permanent $LOG file var
LOG="/var/log/crontab-nightlies-log/crontab.log"
# set $LOG_LOCKED_ERR in case locking failed
LOG_LOCK_ERR="/var/log/crontab-nightlies-log/crontab_lock_problem.$$"
# temp files to store stdout and stderr
# named with the PID of this script in their name so they'll be unique
STDERR="/var/tmp/stderr.$$"
STDOUT="/var/tmp/stdout.$$"
# $STDOUT and $STDERR are removed when the script exits for any reason
trap "rm -f $STDOUT $STDERR" 0
# run a command from this script's argument
# redirect stdout to $STDOUT file and redirect stderr to $STDERR file
DATE=$(date)
echo -n "$DATE: " >> $STDOUT
echo "Running command: $@" >> $STDOUT
"$@" > $STDOUT 2> $STDERR
# get return code from the command run
code=$?
if [ $code != 0 ] ; then
# echoing to stdout/stderr makes cron send email
echo "stdout:"
cat $STDOUT
echo "stderr:"
cat $STDERR
else
# normal exit: just log stdout
# lock $LOG with file descriptor 200
exec 200>>$LOG
# if $LOG is locked by other process - wait for 20 sec
flock -w 20 200 || LOG=$LOG_LOCK_ERR
echo "stdout:" >> $LOG
cat $STDOUT >> $LOG
echo "stderr:" >> $LOG
cat $STDERR >> $LOG
# unlock
flock -u 200
fi
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