[CentOS-devel] Scripted build of a dockerfile (and run it)

Troy wanted to see a copy of my Dockerfile builder. I've sanitized it a
little so it may not run exactly, but the concept is close enough. The goal
was to take one of our tools, and test it in an isolated environment. We
couldn't use virtualenv even though it was all python, due to the fact that
we were modifying 4 different os releases.

Cheers,

herlo
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#!/bin/bash
#
# Testing script which spins up a docker instance each time
# a major change is made to a file

DOCKER="/usr/bin/docker"
DOCKER_ACCT_DEST=lf_tooldev
DOCKER_ACCT_SRC=herlolf
DOCKER_IMG_REV=latest
DISTROS=(centos:7 centos:6 ubuntu:14.04 opensuse:13.2)
SCRIPT_HOME=${PWD}
TOOLS_DIR=${SCRIPT_HOME}/tmp/tools/tools
TOOLS_FILES=(__init__.py linux/linuxtools.py tools.pth)
DELETE_IMAGE=y
BUILD_ONLY=n
NOSETESTS="FALSE"

while getopts :d:s:khbn FLAG; do
  case "${FLAG}" in
    d) #get distro list
      IFS=' ' read -a DISTROS <<< ${OPTARG}
#      DISTROS="${OPTARG}"
      ;;
    k) # keep image flag
      DELETE_IMAGE=n
      ;;
    n) # run nosetests
      NOSETESTS="TRUE"
      ;;
    s) # docker source account
      DOCKER_ACCT_SRC=${OPTARG}
      ;;
    b) # docker source account
      BUILD_ONLY=y
      ;;
    h)
      echo "Usage: $0 [-d <distro_list>] [-k] [-s <docker_image_src>] [-h] <dev_path>"
      echo
      echo "-d: distributions for which to build docker images."
      echo '    Default: (centos:7 centos:6 ubuntu:14.04 opensuse:13.2)'
      echo
      echo "-k: keep generated docker images"
      echo
      echo "-s: source docker account used for building images"
      echo "    Default: herlolf"
      echo "    See examples at https://hub.docker.com/u/herlolf/"
      echo
      echo "-h: help"
      echo
      echo -e "(eg $0 -d "centos:7 ubuntu:14.04" -s herlolf -k '/path/to/tool')"\\n
      exit 0
      ;;
    :)
      echo "Option -${OPTARG} requires an argument"
      exit 1
      ;;
  esac
done
shift $((OPTIND-1))

if [ $# -lt 1 ]; then
  echo "For Help, use '$0 -h'"
  exit 1
else
  if [ -d "${1}" ]; then
    DEV_PATH=$1
  else
    echo "${1} is not a valid path. Please check and try again."
    exit 1
  fi
fi

for file in ${TOOLS_FILES[*]}; do
  if [ ! -e "${TOOLS_DIR}/${file}" ]; then
    echo "Please copy ${file} from git"
    echo "to ${TOOLS_DIR}/."
    exit 1
  fi
done

if [ "${NOSETESTS}" == "TRUE" ]; then
  CMD_TO_RUN="[ \"/srv/tools/run_tests.sh\", \"TRUE\" ]"
else
  CMD_TO_RUN="[ \"/srv/tools/run_tests.sh\" ]"
fi

#echo "CMD_TO_RUN: ${CMD_TO_RUN}"

# clean up ${DEV_PATH}
find ${DEV_PATH} -name '.*sw*' -delete

for DISTRO in ${DISTROS[*]}; do
  D=${DISTRO/:*/}
  V=${DISTRO##*:}

  rm -rf ${SCRIPT_HOME}/tmp/${D}-${V}

  case ${DISTRO} in
    "centos:7" )
      PYTHON_PATH='/usr/lib/python2.7/site-packages'
      ;;
    "centos:6" )
      PYTHON_PATH='/usr/lib/python2.6/site-packages'
      ;;
    "ubuntu:14.04" )
      PYTHON_PATH='/usr/lib/python2.7/dist-packages'
      ;;
    "opensuse:13.2" )
      PYTHON_PATH='/usr/lib/python2.7/site-packages'
      ;;
  esac


  if [ ! -d "${SCRIPT_HOME}/tmp/${D}-${V}" ]; then
    mkdir -p ${SCRIPT_HOME}/tmp/${D}-${V}
  fi

  if [ ! -d "${SCRIPT_HOME}/tmp/tools" ]; then
    mkdir -p ${SCRIPT_HOME}/tmp/tools
  fi

  cp -pr ${DEV_PATH} ${SCRIPT_HOME}/tmp/${D}-${V}/


  cat <<__EOF__ > ${SCRIPT_HOME}/Dockerfile.${D}-${V}
FROM ${DOCKER_ACCT_SRC}/${D}-${V}:${DOCKER_IMG_REV}
MAINTAINER "Clint Savage" <herlo at linuxfoundation.org>

# copy in salt minion configs
COPY salt/conf/minion /etc/salt/minion

# copy in tools to test
COPY tmp/tools/ /srv/tools/tools/
ADD tmp/tools/tools/tools.pth ${PYTHON_PATH}/tools.pth

COPY tmp/${D}-${V} /srv/tools/
COPY run_tests.sh /srv/tools/
RUN chmod +x /srv/tools/run_tests.sh

CMD ${CMD_TO_RUN}

__EOF__

  DATE=$(date +%Y%m%d%H%M)
  echo
  echo "BUILDING DOCKER IMAGE ${DOCKER_ACCT_DEST}/${D}-${V}:${DATE}"
  echo "==========================================================="
  ${DOCKER} build --rm=true --pull=false -t ${DOCKER_ACCT_DEST}/${D}-${V}:${DATE} \
     --file=${SCRIPT_HOME}/Dockerfile.${D}-${V} ${SCRIPT_HOME} &> /dev/null

  if [ "${BUILD_ONLY}" == "y" ]; then
      echo "BUILD_ONLY (-b) flag was passed, stopping"
      echo "To run the image, try:"
      echo "${DOCKER} run -it ${DOCKER_ACCT_DEST}/${D}-${V}:${DATE} '/bin/bash'"
      exit 0
  fi

  ${DOCKER} run -it ${DOCKER_ACCT_DEST}/${D}-${V}:${DATE}
  if [ "${DELETE_IMAGE}" == "y" ]; then
    echo
    echo "DELETING DOCKER IMAGE ${DOCKER_ACCT_DEST}/${D}-${V}:${DATE}"
    echo "==========================================================="
    ${DOCKER} rmi --force ${DOCKER_ACCT_DEST}/${D}-${V}:${DATE} &> /dev/null
  fi
done