#!/bin/sh

print_usage() {
  echo "Usage: $(basename $0) <container id/name> [{command:-$SHELL} [argments...]]"
}

ID="$1"
if [ -z "$ID" ] ; then
  print_usage >&2
  exit 1
fi
shift

PID=$(sudo docker inspect --format '{{.State.Pid}}' "$ID" 2> /dev/null)
if [ -z "$PID" -o "$PID" = "0" ] ; then
  echo "$ID: no such container is running" >&2
  exit 1
fi

echo nsenter --target $PID --mount --uts --ipc --net --pid -- "$@"
sudo nsenter --target $PID --mount --uts --ipc --net --pid -- "$@"