#!/bin/sh
#
# Run this script _after_ making a proposed merge into a copy of
# the target branch (e.g. "master") to see if it contains unrelated
# merging back from the upstream.
#
F=`git diff-tree -r --name-only HEAD^ HEAD`
echo "The topic modifies these paths:"
echo "$F" | sed -e 's/^/	/'

_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
git rev-list --parents master..HEAD^2 |
sed -ne "/^$_x40 $_x40 $_x40/p" |
while read merge first second
do
	echo
	# First is the previous cvs topic tip, second is what was merged into
	# it.  Does the merge have anything to do with adjust the topic to
	# updated upstream?
	git name-rev "$merge"
	out=`git diff-tree --stat "$merge^" "$merge" -- $F`
	case "$out" in
	'')
		echo "* Nothing to do with the topic" ;;
	*)
		echo "$out" ;;
	esac
done