diff_prepare-401

#!/bin/bash

# Prepare a file listing files/dirs not in the target Moodle version that were
# in previous versions, the versions the target version can directly upgrade
# from (example: for Moodle 3.10 all the files in Moodle 3.5 to 3.9 that aren't
# in Moodle 3.10).  Results are placed in /tmp/not_in_$target_branch.

target_branch=MOODLE_401_STABLE
upgradable_from=(MOODLE_39_STABLE MOODLE_310_STABLE MOODLE_311_STABLE MOODLE_400_STABLE)
tempdir=`mktemp -d`
old_cwd=$(pwd)

if [ "$?" -ne "0" ]; then
	>&2 echo "Error: Unable to create temporary directory."
	exit 1
fi

 # I have a reference repo in /usr/share/repos/moodle
git clone --reference-if-able /usr/share/repos/moodle \
			git://git.moodle.org/moodle.git $tempdir/moodle

cd $tempdir/moodle

 # Order is important here: target version first then other branches.
for branch in $target_branch ${upgradable_from[@]}; do
	git checkout $branch
	find | sort > $tempdir/find-$branch
	diff --changed-group-format='%<' --unchanged-group-format='' \
				$tempdir/find-$branch $tempdir/find-$target_branch \
				> $tempdir/diff-$branch
	cp $tempdir/find-$target_branch $tempdir/$target_branch.diff

	if [ "$branch" != "$target_branch" ]; then
		comm -3 $tempdir/$target_branch.diff $tempdir/diff-$branch \
					> $tempdir/$target_branch.diff
	fi
done

sed -i 's/^\s\+.//' $tempdir/$target_branch.diff
sed -i '/^\/\.git/d' $tempdir/$target_branch.diff
mv $tempdir/$target_branch.diff /tmp/not_in_$target_branch
rm -rf $tempdir
cd $old_cwd