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|
#!/bin/sh
set -e
usage_exit()
{
echo
echo "usage: $0 src [--layer=tarball]... dest [dest]..."
echo
echo "example: copying image to devs sde, sdf, sdg"
echo "$0 lx-trainer.img /dev/sde /dev/sdf /dev/sdg"
echo
exit 1
}
if [ `id -u` -ne 0 ]; then
echo "error: this script must be run as root"
exit 1
fi
# minimum 2 arguments
if [ $# -lt 2 ]; then
echo "error: invalid arguments"
usage_exit
fi
# gather arguments
SRC=""
LAYERS=""
DESTS=""
for arg in $@; do
case $arg in
--layer=*)
LAYERS="$LAYERS `echo $arg | sed -e 's/^--layer=//'`"
;;
--*)
echo "error: unknown option: $arg"
usage_exit
;;
*)
if [ -z "$SRC" ]; then
SRC="$arg"
else
DESTS="$DESTS $arg"
fi
;;
esac
done
# source must be file or block device
if [ ! -f "$SRC" -a ! -b "$SRC" ]; then
echo "error: invalid src"
usage_exit
fi
# destination must be block device
for dest in $DESTS; do
if [ ! -b $dest ]; then
echo "error: invalid dest: $dest"
usage_exit
fi
done
# check if we are root (but keep going)
if [ `id -u` -ne 0 ]; then
echo "warning: not root, may not work"
fi
# delete mbr
for dest in $DESTS; do
dd if=/dev/zero of=$dest bs=1M count=1 &
done
wait
partprobe
# efficiently copy source to all destinations
cat $SRC | tee $DESTS > /dev/null
partprobe
# add 2nd partition
for dest in $DESTS; do
/bin/echo -e "n\np\n\n\n\nw" | fdisk $dest &
done
wait
partprobe
# create ext4 on 2nd partition
for dest in $DESTS; do
mkfs.ext4 -L lxhome ${dest}2 &
done
wait
# setup temp directory for mountpoints
TMP_ROOT="/tmp/dd-multi-`date +%s`.$$"
rm -rf $TMP_ROOT
mkdir -p $TMP_ROOT
echo "using temp directory $TMP_ROOT"
for dest in $DESTS; do
# create mountpoints
mkdir -p ${TMP_ROOT}${dest}1
mkdir -p ${TMP_ROOT}${dest}2
# mount partitions
mount ${dest}1 ${TMP_ROOT}${dest}1
mount ${dest}2 ${TMP_ROOT}${dest}2
# move home directories to 2nd partition
mv ${TMP_ROOT}${dest}1/home/* ${TMP_ROOT}${dest}2/
# setup 2nd partition to be mounted as /home
echo 'LABEL=lxhome /home ext4 defaults 0 0' | \
tee -a ${TMP_ROOT}${dest}1/etc/fstab
# copy layer tarballs to /home
for tarball in $LAYERS; do
destfile="${TMP_ROOT}${dest}2/$tarball"
if [ -f $destfile ]; then
echo
echo "WARNING: OVERWRITING $destfile" 1>&2
echo
sleep 1
fi
cp $tarball $destfile
done
# remount home to /home
umount ${TMP_ROOT}${dest}2
mount ${dest}2 ${TMP_ROOT}${dest}1/home
# unpack layers
for tarball in $LAYERS; do
chroot ${TMP_ROOT}${dest}1 tar -x -f /home/$tarball --numeric-owner -C /
rm ${TMP_ROOT}${dest}1/home/$tarball
done
# unmount partitions
umount ${TMP_ROOT}${dest}1/home
umount ${TMP_ROOT}${dest}1
done
# cleanup temp directory
rm -rf $TMP_ROOT
|
