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#!/bin/sh
. /etc/default/rcS
[ "$ROOTFS_READ_ONLY" = "no" ] && exit 0
is_on_read_only_partition () {
DIRECTORY=$1
dir=`readlink -f $DIRECTORY`
while true; do
if [ ! -d "$dir" ]; then
echo "ERROR: $dir is not a directory"
exit 1
else
for flag in `awk -v dir=$dir '{ if ($2 == dir) { print "FOUND"; split($4,FLAGS,",") } }; \
END { for (f in FLAGS) print FLAGS[f] }' < /proc/mounts`; do
[ "$flag" = "FOUND" ] && partition="read-write"
[ "$flag" = "ro" ] && { partition="read-only"; break; }
done
if [ "$dir" = "/" -o -n "$partition" ]; then
break
else
dir=`dirname $dir`
fi
fi
done
[ "$partition" = "read-only" ] && echo "yes" || echo "no"
}
if [ "$1" = "start" ] ; then
if [ `is_on_read_only_partition /var/lib` = "yes" ]; then
grep -q "tmpfs /var/volatile" /proc/mounts || mount /var/volatile
mkdir -p /var/volatile/lib
mkdir -p /var/volatile/.lib-work
# Try to mount using overlay, which is much faster than copying
# files. If that fails, fallback to the slower copy
if ! mount -t overlay overlay -olowerdir=/var/lib,upperdir=/var/volatile/lib,workdir=/var/volatile/.lib-work /var/lib > /dev/null 2>&1; then
cp -a /var/lib/* /var/volatile/lib
mount --bind /var/volatile/lib /var/lib
fi
fi
fi
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