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#!/bin/sh
##
## Copyright 2007-2012 SRI International
##
## This file is part of the Computational Morphometry Toolkit.
##
## http://www.nitrc.org/projects/cmtk/
##
## The Computational Morphometry Toolkit 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 3 of
## the License, or (at your option) any later version.
##
## The Computational Morphometry Toolkit 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 the Computational Morphometry Toolkit. If not, see
## <http://www.gnu.org/licenses/>.
##
## $Revision: 4584 $
##
## $LastChangedDate: 2012-11-12 13:33:41 -0800 (Mon, 12 Nov 2012) $
##
## $LastChangedBy: torstenrohlfing $
##
##
## Helper functions for file locking and dependency checking using simple shell tools (this is not 100% NFS-safe)
##
CMTK_needs_update()
{
local target=$1
if test ! -e ${target}; then
if test -e ${target}.gz; then
target=${target}.gz
fi
fi
shift
local sources="$*"
for source in ${sources}; do
if [ ! -e ${source} ]; then
if [ ! -e ${source}.gz ]; then
echo "========================================================================"
echo "MISSING SOURCE ${source}"
echo "========================================================================"
return 1
fi
fi
if [ -e ${source}.lock ]; then
echo "========================================================================"
echo "SOURCE LOCKED ${source}"
echo "========================================================================"
return 1
fi
done
local source
if [ ! -e ${target} ]; then
echo "========================================================================"
echo "CREATE ${target}"
echo "========================================================================"
return 0
fi
for source in ${sources}; do
if test ! -e ${source}; then
if test -e ${source}.gz; then
source=${source}.gz
fi
fi
if test ${target} -ot ${source}; then
echo "========================================================================"
echo "UPDATE ${target}"
echo "DUE TO ${source}"
echo "========================================================================"
return 0
fi
done
return 1
}
# NFS-safe (hopefully) file locking.
CMTK_lockfile_create()
{
local lockfile=$1.lock
local hostpid=`hostname`-$$
if [ -e ${lockfile} ]; then
# lockfile already exists, so clearly we were not the first
return 1;
fi
mkdir -p `dirname ${lockfile}`
echo ${hostpid} >> ${lockfile}
if [ `head -n 1 ${lockfile}` != ${hostpid} ]; then
# first one to write PID was not us
return 1;
fi
trap "rm -f ${lockfile}; exit" INT TERM EXIT
return 0;
}
CMTK_lockfile_delete()
{
local file=${1}
local lockfile=${file}.lock
local realfile=${file}
[ -f ${realfile} ] || realfile=${file}.gz
[ -f ${realfile} ] || realfile=${file}.xz
if [ -f ${realfile} ]; then
# do not update timestamp if file is older than lock (i.e., existed before and did not get updated at all)
if test ${lockfile} -ot ${realfile}; then
touch --no-create -r ${lockfile} ${realfile}
fi
fi
rm -f ${lockfile}
trap - INT TERM EXIT
}
#
# Combine dependency checking with locking of target
#
CMTK_needs_update_and_lock()
{
local target=$1
local realtarget=$target
[ -e ${realtarget} ] || realtarget=${target}.gz
[ -e ${realtarget} ] || realtarget=${target}.xz
[ -e ${realtarget} ] || realtarget=${target}
shift
if CMTK_needs_update ${realtarget} $*; then
if CMTK_lockfile_create ${target}; then
return 0
fi
fi
return 1
}
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