#!/bin/bash
# Copyright (c) 2012 Vladimir Fedorkov (http://astellar.com/)
# All rights reserved.                                                         
#                                                                              
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# modification, are permitted provided that the following conditions
# are met:
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#    notice, this list of conditions and the following disclaimer.
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#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
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# Consulting services for MySQL and Sphinx are available upon request
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#

UNIQSTR=$$
LOCK_PREFIX="/tmp/my.lock."

LOCK_NAME="$LOCK_PREFIX$UNIQSTR"

echo $LOCK_NAME

touch $LOCK_NAME

if [[ -e $LOCK_NAME && `ls -la $LOCK_PREFIX* | wc -l` == 1 ]] ; then

	echo -n "Started..."
	sleep 10
	rm -f $LOCK_NAME
	echo "Done."
else 

### another process is running, removing lock
	echo "re-entry, exiting"
	rm -f $LOCK_NAME
	exit 1
fi