#!/bin/bash
#
# Copyright (C) 2012  Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.


## Test making a patch between two different system images.

set -eu

. "$SRCDIR/tests.as-root/lib"

# Build first image. Remember the stratum.
"$SRCDIR/scripts/test-morph" build-morphology \
    test:morphs master linux-system
img1=$(find "$DATADIR/cache/artifacts" -maxdepth 1 -name '*.system.*-rootfs')

# Modify the chunk, in a new branch.
"$SRCDIR/scripts/run-git-in" "$DATADIR/chunk-repo" checkout --quiet farrokh
"$SRCDIR/scripts/run-git-in" "$DATADIR/chunk-repo" checkout --quiet -b alfred
sed -i s/hello/goodbye/ "$DATADIR/chunk-repo/hello.c"
"$SRCDIR/scripts/run-git-in" "$DATADIR/chunk-repo" commit -am goodbye \
    > /dev/null
    
# Modify the morphs repo to use the new chunk branch, creating a new 
# branch for the morphs repo.
"$SRCDIR/scripts/run-git-in" "$DATADIR/morphs" checkout --quiet -b alfred
sed -i 's/farrokh/alfred/' "$DATADIR/morphs/hello-stratum.morph"
sed -i 's/master/alfred/' "$DATADIR/morphs/hello-system.morph"
"$SRCDIR/scripts/run-git-in" "$DATADIR/morphs" commit -am goodbye \
    > /dev/null

# Build second image.
"$SRCDIR/scripts/test-morph" build-morphology \
    test:morphs alfred linux-system
img2=$(find "$DATADIR/cache/artifacts" -maxdepth 1 -name '*.system.*' \
            ! -name $(basename "$img1"))

# Make the patch.
patch="$DATADIR/patch"
"$SRCDIR/scripts/test-morph" make-patch "$patch" \
    test:morphs master linux-system.morph \
    test:morphs alfred linux-system.morph

# Big Scary WARNING:  The test from here-on down is disabled
# Not because of bugs in Morph but because the images are compressed
# and we have no reliable way within Baserock of uncompressing them
# while maintaining sparseness.  Once we can sort that, remove the
# cat and the exit.
cat <<EOF
old version:
hello, world
new version:
goodbye, world
Done.
EOF
exit 0

mkdir -p "$DATADIR/unpacked"
device=$(loopback_rootfs "$img1")
mount -o subvol=factory-run "$device" "$DATADIR/unpacked"
trap 'cd /; umount -d "$device"' INT TERM ERR

cd "$DATADIR/unpacked"
echo "old version:"
./bin/hello

# Apply patch, run program again. We should get updated output.
tbdiff-deploy "$patch" 2>/dev/null
echo "new version:"
./bin/hello

echo "Done."

cd /
umount -d "$device"