#!/bin/sh
# Stand-in for ssh when Frame Control's server runs on the Frame itself
# (FRAME_LOCAL=1, started by the iPhone app). The server and its helpers call
# `ssh [options] frame COMMAND`, and rsync calls it as its transport; here that
# means: run COMMAND in the home directory, as ssh would, with the same stdin.
while [ $# -gt 0 ]; do
  case "$1" in
    -[bcDEeFIiJLlmOoPpQRSWwB]) shift 2 ;;  # options that take a value
    -?*) shift ;;
    *) break ;;
  esac
done
[ $# -gt 0 ] && shift  # the host alias
cd "$HOME" || exit 255
[ $# -eq 0 ] && exit 0  # -N: nothing to run
# Stopping ssh ends everything the command started (sshd hangs up the session).
# To do the same, run COMMAND as its own process group and pass on a TERM, HUP
# or INT to all of it, so e.g. a live-video ffmpeg can't outlive its stream.
set -m  # job control: the background job gets its own process group, and keeps stdin
"${SHELL:-/bin/sh}" -c "$*" &
child=$!
trap 'kill -TERM -- "-$child" 2>/dev/null' TERM HUP INT
wait "$child"
status=$?
while kill -0 "$child" 2>/dev/null; do  # a trapped signal ends `wait` early
  wait "$child"
  status=$?
done
exit "$status"