#!/bin/bash -e

aufs_dir="$1"

export GIT_DIR="$aufs_dir/.git"

from_line='From: J. R. Okajima <hooanon05@yahoo.co.jp>'
if [ -d "$GIT_DIR" ]; then
    origin_line="Origin: https://github.com/sfjro/aufs4-standalone/tree/$(git rev-list HEAD -1)"
else
    echo >&2 "W: Cannot include a specific origin URL without an aufs git repo"
    origin_line='Origin: https://github.com/sfjro/aufs4-standalone/branches'
fi
bug_line='Bug-Debian: https://bugs.debian.org/541828'

for patch in aufs4-{base,mmap,standalone}.patch; do
    {
	echo "$from_line"
	if [ -d "$GIT_DIR" ]; then
	    git log --pretty='Date: %ad' HEAD -1 -- "$patch"
	fi
	echo -n 'Subject: '
	grep -v '^SPDX-License-Identifier:' "$aufs_dir/$patch" | head -1
	echo "$origin_line"
	echo "$bug_line"
	echo
	echo 'Patch headers added by debian/bin/genpatch-aufs'
	echo
	sed 's/^+.*EXPORT_SYMBOL\b/&_GPL/' < "$aufs_dir"/"$patch"
    } > debian/patches/features/all/aufs4/"$patch"
done