#/usr/bin/env bash
# Trigger Director config rendering when something changed

# This is a git hook that will run after `git pull`. In case any file was
# changed it will instruct Director to re-render the current configuration.
#
# Add this file to your git working directory as `.git/hooks/post-merge`. It
# has to executable (`chmod +x`), otherwise it wouldn't run. The `icingacli`
# has to be on your `PATH` when running `git pull`.
#
# TODO: verify whether HEAD@{1} instead of ORIG_HEAD should be preferred

changed_files() {
    git diff-tree -r --name-only --no-commit-id ORIG_HEAD HEAD
}

had_changes()  {
   local changed_lines=$(changed_files | wc -l)
   if [ "$changed_lines" -gt "0" ]; then
       return 0
   else
       return 1
   fi
}

render_director_config() {
    `icingacli director config render`
}

run_if() {
  $1 && eval "$2"
}

run_if had_changes render_director_config