#! /bin/sh

self=`basename $0`

ARGS="$*"
unset RUN CONTAINER

set_container_name () {
  CONTAINER=`docker ps -l | awk 'NR > 1 {print $NF;exit}'`
  [ -n "$CONTAINER" ] || {
     echo "*** $self: no container avilable (maybe try later)" >&2
     exit 1
  }
}

case "$ARGS" in
-*) echo "Usage: $self [/shell|image_name ..]" >&2
    exit 2
    ;;
'') set_container_name
    ARGS="$CONTAINER"
    RUN=/bin/bash
    ;;
/*) set_container_name
    ARGS="$CONTAINER"
    RUN="$*"
esac

set -x
exec docker container exec -it $ARGS $RUN

# End