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#!/bin/sh
error() {
cat <<EOF;
usage: mdkinst_stage2_tool [--clean] [--compress | --uncompress] <stage2 dir> [<compressed file>]
EOF
exit 1
}
if [ "$1" = "--clean" ]; then
CLEAN=1
shift
fi
[ $# = 2 -o $# = 3 ] || error
if [ "$1" = "--compress" -o "$1" == "--uncompress" ]; then
ACTION=$1
shift
STAGE2_DIR="$1"
shift
LIVE_DIR="$STAGE2_DIR/live"
if [ -n "$1" ]; then
COMPRESSED_IMAGE=$1
shift
else
COMPRESSED_IMAGE="$STAGE2_DIR/mdkinst.sqfs"
fi
else
error
fi
if [ $ACTION = "--compress" ]; then
which mksquashfs >/dev/null 2>/dev/null || { echo "missing command mksquashfs (from squashfs-tools)"; exit 1; }
[ -d "$LIVE_DIR" ] || error
echo "Creating $COMPRESSED_IMAGE from $LIVE_DIR"
rm -f $STAGE2_DIR/.room
mksquashfs $LIVE_DIR $COMPRESSED_IMAGE -all-root -noappend >/dev/null || { echo "mksquashfs failed"; exit 1; }
chmod 755 $COMPRESSED_IMAGE
echo foo > $STAGE2_DIR/.room
if [ -s $STAGE2_DIR/.room ]; then
rm -f $STAGE2_DIR/.room
[ -n "$CLEAN" ] && rm -rf $LIVE_DIR
else
echo "not enough space"
rm -f $COMPRESSED_IMAGE
exit 1
fi
else
[ -f "$COMPRESSED_IMAGE" ] || error
echo "Creating $LIVE_DIR from $COMPRESSED_IMAGE"
TMPDIR=${TMPDIR=/tmp}
MNTPOINT=$TMPDIR/stage2_img
if [ $EUID != "0" ]; then
SUDO="sudo"
PATH="/sbin:/usr/sbin:$PATH"
fi
$SUDO umount $MNTPOINT 2>/dev/null
mkdir -p $MNTPOINT
$SUDO mount -o loop -t squashfs $COMPRESSED_IMAGE $MNTPOINT || { echo "can not loopback mount $COMPRESSED_IMAGE"; exit 1; }
mkdir $LIVE_DIR || { echo "not enough space"; exit 1; }
cp -a $MNTPOINT/* $LIVE_DIR/ || { rm -rf $LIVE_DIR; exit 1; }
$SUDO umount $MNTPOINT
[ -n "$CLEAN" ] && rm -f $COMPRESSED_IMAGE
fi
exit 0
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