#!/bin/bash
#
# Copyright 2019 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# This script allows to compare Cr50 source files across branches, By default
# it compares files in the current tree with the Cr50 pre-pvt branch
# (cros/firmware-cr50-9308.B). If the user wants to compare with some other
# branch or any git sha1 to that matter, the branch name/sha1 could be passed
# as the command line parameter.
#
# This script will erase build/cr50 and then re-build Cr50 image, and then
# based on .o and .d files found in build/cr50/RW will figure out the set of
# constituent source files which need to be compared across branches, and then
# compare the files with the requested branch, reporting the differences.
#
# Note that all files in util/signer are also included in the comparison.

tmpf="/tmp/bcmp.$$"

if [[ ! -f Makefile.rules || ! -f board/cr50/board.h ]]; then
  echo "this script must run in the root ec directory" >&2
  exit 1
fi

if [[ "$#" != 0 ]]; then
  compare_to="$1"
else
  compare_to="cros/firmware-cr50-9308.B"
fi

echo "Will rebuild CR50"
rm -rf build/cr50
if ! make BOARD=cr50 CR50_DEV=1 -j > /dev/null ; then
  echo "building cr50 failed" >&2
  exit 1
fi
echo "Now looking for .c and .S files"

for f in $((cd build/cr50/RW; find . -name '*.o'); find util/signer -type f); do

  c="${f/\.o/.c}"
  if [[ -f "$c" ]]; then
    echo "$c" >> "${tmpf}"
    continue
  fi
  g="${f/\.o/.S}"
  if [ -f "$g" ]; then
    echo "$g" >> "${tmpf}"
    continue
  fi
  echo "neither $c nor $g found in this tree" >&2
done

echo "Now looking for .h files"
for f in $(find build/cr50/RW/ -name '*.d' -exec cat {} + |
              sed 's/ /\n/g' |
              sed 's|/mnt/host/source/src/platform/ec/||' |
              grep -v third_party |
              sort -u |
              grep '\.h' ); do
  if [ ! -f $f ]; then
    echo $f is not in this tree;
    continue;
  fi;
  echo $f >> "${tmpf}"
done

echo "Comparing local tree to ${compare_to}"
git diff "${compare_to}" $(cat "${tmpf}");

rm -rf "${tmpf}"