fs/skeleton/bin/ginstall

#!/bin/sh

die() {
  local code="$1"
  shift
  echo "$@" >&2
  exit "$code"
}

main() {
  local res
  local once=0

  # One-indexed arguments.
  local i=1
  for arg in "$@"; do
    if [ "$arg" = "--once" ]; then
      [ "$i" -gt 1 ] && die 1 "Error: --once should be first arg. Was arg $i"
      once=1
      shift
      break
    fi

    i=$(($i + 1))
  done

  lockfile-create --use-pid --retry 0 /tmp/ginstall ||
    die 2 "Unable to acquire lock. Ginstall instance already running."

  if [ "$once" -eq 1 ] && [ -e "/tmp/ginstall_complete" ]; then
    lockfile-remove /tmp/ginstall
    die 0 "Previous instance completion detected.  Skipping."
  fi

  ginstall.real "$@"
  res="$?"
  if [ "$res" -eq 0 ]; then
    touch /tmp/ginstall_complete
  fi
  lockfile-remove /tmp/ginstall
  exit "$res"
}

main "$@"