#!/bin/bash
#
#    Copyright (C) 2006  Brian Brazil
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
#

# Run a command and save output to a logfile, and output a warning if the
# command fails. Intended to be run from cron.
# Also does locking
# Usage: cronwrapper /path/to/log/files/and_file_prefix command arg1 arg2

LOCKFILE="$1".lock
if ! ln -s "$$.$HOSTNAME" "$LOCKFILE"; then
	echo "Error: lockfile '$LOCKFILE' exists"
	exit 1
fi

LOGFILE="$1.$HOSTNAME.$(date +'%F.%R:%S')"
shift

echo "cronwrapper: starting '$@' at $(date)" >> $LOGFILE

#Is there a better way to do this?
if ! bash <<<"$@" >> "$LOGFILE" 2>&1; then
	echo "cronwrapper: error in '$@' at $(date)" >> $LOGFILE
	echo "An error occured. See $LOGFILE for logs"
	echo "Leaving lockfile in place"
	exit 1
fi;

echo "cronwrapper: finished '$@' at $(date)" >> $LOGFILE

rm "$LOCKFILE"