#!/bin/sh
## (c) Bernhard Tittelbach 2017-10-28, Tschunk-License
## (c) nicoo               2018-05-20, Tschunk-License
## this is the post-recieve hook installed in /home/tuergit/keys.git/hooks/

set -eu

keys_branch=$(git config hooks.keys_branch 2>/dev/null || echo "")
keys_file=$(git config hooks.keys_file 2>/dev/null || echo "")
keys_pipe_to=$(git config hooks.keys_pipe_to 2>/dev/null || echo "")

keys_branch=${keys_branch:-master}
keys_file=${keys_file:-keys}
keys_pipe_to=${keys_pipe_to:-sudo /usr/local/bin/update-keys-from-stdin.sh}

changedcommits=$( grep "refs/heads/${keys_branch}" | sed 's/\([0-9a-f]\+\)\s\+\([0-9a-f]\+\)\s\+.*/\1..\2/;' )

catgitkeyfile() {
	git show "${keys_branch}:${keys_file}"
}

if git whatchanged --oneline $changedcommits | grep -qe "^:.*${keys_file}\$"; then
  echo "./$keys_file changed in pushed commits. Updating keys in firmware!"
  ## update door
  catgitkeyfile | ${keys_pipe_to}
else
  echo "./$keys_file not changed, not updating keys in firmware"
fi