remote-remaster

#!/bin/bash
#
# Remote (ARM server) remaster script to be run on the remote. This is
# essentially the remote harness.
#
# Copyright Harald Sitter 2015, may be copied under GNU GPL v2 or

set -ex

__dir__=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
CACHEDIR=$__dir__/cache
OUTDIR=$__dir__/output
EXTRACTDIR=$__dir__/ubuntu-touch-remaster/extract

TAR="tar --numeric-owner --atime-preserve --preserve-permissions"

function chroot_teardown {
  if [ -z "$REMASTER_CHROOT_SETUP" ]; then
    return
  fi

  echo "=== Un-Binding /proc, /sys and /dev"
  umount $EXTRACTDIR/sys
  umount $EXTRACTDIR/dev
  umount $EXTRACTDIR/proc

  echo "=== removing resolve.conf in chroot  `date`"
  rm $EXTRACTDIR/etc/resolv.conf

  trap - EXIT SIGHUP SIGINT SIGTERM
  unset REMASTER_CHROOT_SETUP
}

function chroot_setup {
  if [ ! -z "$REMASTER_CHROOT_SETUP" ]; then
    return
  fi

  export REMASTER_CHROOT_SETUP=1
  trap chroot_teardown EXIT SIGHUP SIGINT SIGTERM

  echo "=== setting up resolve.conf in chroot  `date`"
  cp /etc/resolv.conf $EXTRACTDIR/etc/

  echo "=== Binding /proc, /sys and /dev"
  mount --bind /dev  $EXTRACTDIR/dev
  mount --bind /proc $EXTRACTDIR/proc
  mount --bind /sys  $EXTRACTDIR/sys
}

[[ -d "$CACHEDIR" ]] || mkdir -p $CACHEDIR

rm -rf $OUTDIR
mkdir -p $OUTDIR

rm -rf $EXTRACTDIR
mkdir -p $EXTRACTDIR

echo "=== syncing reference image  `date`"
pushd $CACHEDIR
zsync http://cdimage.ubuntu.com/ubuntu-touch/vivid/daily-preinstalled/current/vivid-preinstalled-touch-armhf.tar.gz.zsync
img=$CACHEDIR/vivid-preinstalled-touch-armhf.tar.gz
popd

echo "=== extracting reference image  `date`"
$TAR --preserve-order -xpf $img -C $EXTRACTDIR

chroot_setup

echo "=== Entering chroot  `date`"
cp $__dir__/chroot-remaster $EXTRACTDIR/remaster
chroot $EXTRACTDIR /bin/bash /remaster

chroot_teardown

echo "=== making a new tar - this takes an age  `date`"
# gzip rsyncable as the gz is being extracted and meddled with as part of the
# image import, so the gzip we output here will not be the one used for
# devices anyway. might as well improve for transfer here. all things considered
pushd $EXTRACTDIR
$TAR -cp * | gzip --rsyncable -1 >$OUTDIR/vivid-preinstalled-touch-armhf.tar.gz
popd