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|
#!/bin/sh
set -e
# This script only supports GPT partitions for the lx-trainer image.
ROOTPT=3
EXTRAPT=4
usage_exit()
{
echo
echo "usage: sudo $0 src [--layer=tarball]... dest [dest]..."
echo
echo "example: copying image to devices: sde, sdf, sdg"
echo "$0 lx-trainer.img /dev/sde /dev/sdf /dev/sdg"
echo
exit 1
}
# minimum 2 arguments
if [ $# -lt 2 ]; then
echo "error: invalid arguments"
usage_exit
fi
if [ `id -u` -ne 0 ]; then
echo "error: sorry, this script must be run as root"
exit 1
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
# all layers must be available
for tarball in $LAYERS; do
if [ ! -f $tarball ]; then
echo "error: missing layer file: $tarball"
usage_exit
fi
done
# detect partion type of source
if [ "`env - /sbin/parted --script $SRC print | \
grep 'Partition Table' | awk '{print $3}'`" != "gpt" ]; then
echo "error: only gpt partition tables supported"
usage_exit
fi
# delete mbr's
dd if=/dev/zero bs=10M count=1 2> /dev/null | tee $DESTS > /dev/null
# efficiently copy source to all destinations and rescan devices
echo 'monitor copy status with: sudo kill -s USR1 `pidof dd`'
dd if=$SRC bs=64M | tee $DESTS > /dev/null
echo 'setting up /home partition'
# fix partition table and add extra /home partition
for dest in $DESTS; do
parted $dest print fix > /dev/null 2>&1
parted --script --align optimal -- $dest mkpart /home 17GB -1MB
done
# rescan devices
while ! partprobe $DESTS 2> /dev/null; do
echo "waiting for partprobe..."
sleep 1
done
# wait for partitions to appear
for dest in $DESTS; do
while [ ! -b ${dest}${ROOTPT} ]; do
echo "waiting for ${dest}${ROOTPT}..."
sleep 1
done
while [ ! -b ${dest}${EXTRAPT} ]; do
echo "waiting for ${dest}${EXTRAPT}..."
sleep 1
done
done
# create ext4 on home partition
for dest in $DESTS; do
mkfs.ext4 -L lxhome ${dest}${EXTRAPT} > /dev/null 2>&1 &
done
wait
# setup temp directory for mountpoints
TMP_ROOT="/tmp/dd-multi-`date +%s`.$$"
rm -rf $TMP_ROOT
mkdir -p $TMP_ROOT
echo "using directory $TMP_ROOT for mount points"
for dest in $DESTS; do
# create mountpoints
mkdir -p ${TMP_ROOT}${dest}${ROOTPT}
mkdir -p ${TMP_ROOT}${dest}${EXTRAPT}
# mount partitions
mount ${dest}${ROOTPT} ${TMP_ROOT}${dest}${ROOTPT}
mount ${dest}${EXTRAPT} ${TMP_ROOT}${dest}${EXTRAPT}
# move home directories (if any) to home partition
if [ -n "`ls ${TMP_ROOT}${dest}${ROOTPT}/home`" ]; then
echo "moving /home/* to ${dest}${EXTRAPT}"
mv ${TMP_ROOT}${dest}${ROOTPT}/home/* ${TMP_ROOT}${dest}${EXTRAPT}/
fi
# setup home partition to be mounted as /home
echo 'LABEL=lxhome /home ext4 defaults 0 0' | \
tee -a ${TMP_ROOT}${dest}${ROOTPT}/etc/fstab > /dev/null
# remount home to /home
umount ${TMP_ROOT}${dest}${EXTRAPT}
mount ${dest}${EXTRAPT} ${TMP_ROOT}${dest}${ROOTPT}/home
done
# unpack layers (in parallel)
for tarball in $LAYERS; do
echo "unpacking layer: $tarball"
for dest in $DESTS; do
tar -x -f $tarball --numeric-owner \
-C ${TMP_ROOT}${dest}${ROOTPT} &
done
wait
done
for dest in $DESTS; do
# If there were no layer files added, umount might return a busy
# error since we just mounted. (Possibly a kernel bug.) By
# accessing the filesytem before unmounting it, the mount/umount
# problem seems to go away. Use "ls" to access the filesystem.
ls ${TMP_ROOT}${dest}${ROOTPT}/home/ > /dev/null
# unmount partitions
umount ${TMP_ROOT}${dest}${ROOTPT}/home
umount ${TMP_ROOT}${dest}${ROOTPT}
done
# cleanup temp directory
rm -rf $TMP_ROOT
echo 'done, no errors'
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