#!/bin/sh
set -e

# Snippet based on dpkg-maintscript-helper from dpkg 1.15.8.
# Postinst explains why.
rm_conffile () {
	CONFFILE=$1; shift
	test "$1" = install || test "$1" = upgrade || return 0
	dpkg --compare-versions "$2" lt-nl '1:1.7.4.1-2~' || return 0
	test -e "$CONFFILE" || return 0

	md5sum=$(md5sum $CONFFILE | sed -e 's/ .*//')
	old_md5sum=$(
		dpkg-query -W -f='${Conffiles}' git |
		sed -n -e "\' $CONFFILE ' { s/ obsolete\$//; s/.* //; p }"
	)
	if test "$md5sum" != "$old_md5sum"; then
		echo "$CONFFILE has been modified by you."
		echo "Saving as $CONFFILE.dpkg-bak ..."
		mv -f "$CONFFILE" "$CONFFILE.dpkg-backup"
	else
		echo "Moving $CONFFILE out of the way..."
		mv -f "$CONFFILE" "$CONFFILE.dpkg-remove"
	fi
}

# Now /etc/emacs/site-start.d/50git-core.el belongs to the
# git-el package.  If we are upgrading from a pre- 1.7.4.1-2~
# version then git-el is at most unpacked (so its version
# is 50git-core.el.dpkg-new if present), and we can remove
# an unchanged 50git-core.el file without danger.
#
rm_conffile /etc/emacs/site-start.d/50git-core.el "$1" "$2"