#! /bin/sh
# TODO do_work should retry until success
set -euf

port=${port-1028}
local_painload=$HOME/painload
remote_painload="https://github.com/krebscode/painload"
local_hosts=$HOME/hosts
remote_hosts="git@github.com:krebscode/hosts.git"

main() {
  ensure_local_painload
  ensure_local_hosts
  is_worker && do_work || become_server
}

ensure_local_painload() {
  test -d "$local_painload" || git clone "$remote_painload" "$local_painload"
}

ensure_local_hosts() {
  test -d "$local_hosts" || git clone "$remote_hosts" "$local_hosts"
}

become_server() {
  exec socat "TCP-LISTEN:$port,reuseaddr,fork" "EXEC:$0"
}

is_worker() {
  test "${SOCAT_SOCKPORT-}" = "$port"
}

do_work() {
  # read request
  req_line="$(read line && echo "$line")"
  req_hdrs="$(sed -n '/^\r$/q;p')"

  set -x

  cd "$local_hosts"
  git pull >&2

  cd "$local_hosts"
  find . -name .git -prune -o -type f -exec git rm \{\} \; >/dev/null

  cd "$local_painload"
  git pull >&2

  find "$local_painload/retiolum/hosts" -type f -exec cp \{\} "$local_hosts" \;

  cd "$local_hosts"
  find . -name .git -prune -o -type f -exec git add \{\} \; >&2
  if git status --porcelain | grep -q .; then
    git config user.email "$LOGNAME@$(hostname)"
    git config user.name "$LOGNAME"
    git commit -m bump >&2
    git push >&2
  fi

  echo "HTTP/1.1 200 OK"
  echo
  echo "https://github.com/krebscode/hosts/archive/master.tar.gz"
  echo "https://github.com/krebscode/hosts/archive/master.zip"
}

main "$@"