Aliases wrapper makes simpler interface for Docker CLI

whale.sh

#!/usr/bin/env bash
#
# Whale: a simpler interface for docker cli
# LICENSE: GPLv3
#
# - `whale build` # builds Dockerfile in current directory
# - `whale run` # runs last `whale build` container
# - `whale buildrun` # same as `whale build && whale run`
# - `whale sh` # opens `/bin/ash` on last `whale build` container (you can optionally specify another shell like `/bin/bash` as the first argument)
# - `whale buildrun -p 8080:80` # build and run the container with options

LAST_HASH=$(cat /tmp/.LAST_WHALE_BUILD)
VERB="${1}"; shift
OPTIONAL_HASH=$(echo "${1}" | sed -n -r 's/^([a-z0-9]+)$/\1/p'); if [ -n "${OPTIONAL_HASH}" ]; then shift; else unset OPTIONAL_HASH; fi

case "${VERB}" in
  build)
    CMD="docker build ."
    echo + ${CMD}
    exec 6>&1; OUT=$(exec ${CMD}| tee /dev/fd/6)
    CODE=$?
    LAST_HASH=$(echo "${OUT}" | sed -n -r 's/Successfully built ([a-z0-9]+)/\1/p')
    echo "${LAST_HASH}" > /tmp/.LAST_WHALE_BUILD
    exit ${CODE}
    ;;
  run)
    set -x
    docker run $* ${OPTIONAL_HASH:-$LAST_HASH}
    ;;
  sh)
    OPTIONAL_SHELL="${1}"
    shift
    set -x
    docker run -it $* ${OPTIONAL_HASH-$LAST_HASH} ${OPTIONAL_SHELL:-"/bin/ash"}
    ;;
  buildrun)
    whale build && whale run $*
    ;;
esac