#!/usr/bin/env bash
set -euo pipefail

helper_dir=${SLOPTRAP_HELPER_DIR:-/run/sloptrap-helper}
queue_dir="$helper_dir/queue"
mkdir -p "$queue_dir"

if [[ ${1-} != "install" ]]; then
  printf 'usage: slop-apt install <package...>\n' >&2
  exit 2
fi
shift

if [[ $# -eq 0 ]]; then
  printf 'slop-apt: at least one package is required\n' >&2
  exit 2
fi

for package in "$@"; do
  if [[ ! $package =~ ^[A-Za-z0-9+.-]+$ ]]; then
    printf 'slop-apt: invalid package name %s\n' "$package" >&2
    exit 2
  fi
done

request_dir=$(mktemp -d "$queue_dir/request.XXXXXX.req")
trap 'rm -rf "$request_dir"' EXIT INT TERM HUP
printf 'apt-install\n' >"$request_dir/op"
printf '%s\n' "$@" >"$request_dir/packages"

while [[ ! -f "$request_dir/status" ]]; do
  sleep 1
done

if [[ -s "$request_dir/stdout" ]]; then
  cat "$request_dir/stdout"
fi
if [[ -s "$request_dir/stderr" ]]; then
  cat "$request_dir/stderr" >&2
fi

status=$(<"$request_dir/status")
exit "$status"