docker-builder.sh

#!/bin/bash
#########################################################################
#                                                                       #
# docker-builder.sh is a script for managing complex docker images     #
# It provivides an easy mechanism for creating and building docker      #
# images                                                                #
#                                                                       #
# Author:	Felix Imobersteg                                              #
# Email:	felix@whatwedo.ch                                             #
# Website:	http://whatwedo.ch                                          #
#                                                                       #
#########################################################################


########################################################
# CHECK PREREQUISITES                                  #
########################################################

# Exit on error
set -e

# Check software
dockerTest=$(which docker)
m4Test=$(which m4)
[[ -z "$dockerTest" && "$1" -ne "lint-file" && "$1" -ne "lint-files" ]] && { echo "docker doesn't appear to be installed - this is required for script to run"; exit 1; }
[[ -z "$m4Test" && "$1" -ne "lint-file" && "$1" -ne "lint-files" ]] && { echo "m4 doesn't appear to be installed - this is required for script to run"; exit 1; }

# Set directory
cd "$(dirname "$0")"


########################################################
# MAIN                                                 #
########################################################

# build all dockerfiles
build-files() {
  rm -rf "dist"
	for file in images/*.m4; do
	  name="${file##*/}"
	  name="${name%.*}"
	  build-file $name
	done
}


# build the given dockerfile
build-file() {
  rm -rf "dist/$1"
  mkdir -p "dist/$1"
  cp -R files "dist/$1"
  echo "
##################################################
#                                                #
# DO NOT EDIT THIS FILE MANUALLY                 #
# AUTOMATICALLY CREATED WITH docker-builder.sh   #
#                                                #
##################################################
  " > "dist/$1/Dockerfile"

  lastline=""
  templine=""
  while read -r line; do
    if  [[ $line == RUN* ]] && [[ $templine == RUN* ]] ;
    then
      echo "$lastline && \\" >> "dist/$1/Dockerfile"
      templine=$line
      lastline=$(echo "$line" | sed 's/^RUN //g' )
    elif [[ $line == LASTRUN* ]] && [[ $templine == RUN* ]] ;
    then
      line=$(echo "$line" | sed 's/^LASTRUN\ /RUN\ /g' )
      echo "$lastline" >> "dist/$1/Dockerfile"
      templine=$line
      lastline=$line
    else
      line=$(echo "$line" | sed 's/^LASTRUN\ /RUN\ /g' )
      echo "$lastline" >> "dist/$1/Dockerfile"
      templine=$line
      lastline=$line
    fi
  done <<< "$(m4 -I "modules/*.m4" "images/$1.m4" | grep -v '^\#' | grep -v '^\s*$')"
  echo "$lastline" >> "dist/$1/Dockerfile"

  echo "LABEL ch.whatwedo.image.base=\"whatwedo/$1\"" >> "dist/$1/Dockerfile"

  cp "images/$1.md" "dist/$1/README.md"
}


# build the given image
build-image() {
  cd "dist/$1"
  DOCKER_OPTS="--dns 8.8.8.8 --dns 8.8.4.4" docker build --no-cache --rm -t "$1:latest" .
  cd ../..
  if [[ $1 == "base" ]]; then
    docker-squash $1 -t $1
  else
    docker-squash $1 -t $1 -f whatwedo/base:latest
  fi

}

# build the given image with cache
build-cached-image() {
  cd "dist/$1"
  DOCKER_OPTS="--dns 8.8.8.8 --dns 8.8.4.4" docker build --rm -t "$1:latest" .
  cd ../..
}

# Publish the given image
publish-image() {
  VERSION="$(git describe --tags `git rev-list --tags --max-count=1`)"
  docker tag $1 whatwedo/$1:$VERSION
  docker push whatwedo/$1:$VERSION
  docker tag $1 whatwedo/$1:latest
  docker push whatwedo/$1:latest
}

# download latest base images
update-base-images() {
  docker pull ubuntu:14.04
  docker pull whatwedo/base:latest
}

# lint all dockerfiles
lint-files() {
  echo "start"
  for file in dist/*; do
    name="${file##*/}"
    echo ""
    echo ""
    echo "##########################################"
    echo "# Linting image $name"
    echo "##########################################"
    echo ""
    lint-file $name
  done
    echo ""
    echo ""
}

# Lint file with hadolint
lint-file() {
  cd "dist/$1"
  if [[ -f /root/.local/bin/hadolint ]]; then
    /root/.local/bin/hadolint ./Dockerfile
  else
    docker run --rm -i -v `pwd`:/data lukasmartinelli/hadolint hadolint /data/Dockerfile || true
    # allow failure to not interrupt the ci task
  fi
  cd ../..
}

if [ "$1" = "build-files" ]; then
  build-files
elif [ "$1" = "build-file" ]; then
  [ -z "$2" ] && { echo "Image name not specified"; exit 1; }
  build-file $2
elif [ "$1" = "build-image" ]; then
  [ -z "$2" ] && { echo "Image name not specified"; exit 1; }
  update-base-images
  build-file $2
  build-image $2
elif [ "$1" = "build-cached-image" ]; then
  [ -z "$2" ] && { echo "Image name not specified"; exit 1; }
  update-base-images
  build-file $2
  build-cached-image $2
elif [ "$1" = "publish-image" ]; then
  [ -z "$2" ] && { echo "Image name not specified"; exit 1; }
  publish-image $2
elif [ "$1" = "lint-file" ]; then
  [ -z "$2" ] && { echo "Image name not specified"; exit 1; }
  lint-file $2
elif [ "$1" = "lint-files" ]; then
  lint-files
else
	echo "
  docker-builder.sh is a script for managing complex docker images
  It provivides an easy mechanism for creating and building docker
  images

  USAGE:

  ./docker-builder.sh build-files                - This will build all dockerfiles
  ./docker-builder.sh build-file [name]          - This will build the given dockerfile
  ./docker-builder.sh build-images               - This will build all images
  ./docker-builder.sh build-image [name]         - This will build the given image
  ./docker-builder.sh build-cached-image [name]  - This will build the given image with cache
  ./docker-builder.sh publish-image [name]       - This will publish the given existing image
  ./docker-builder.sh lint-file [name]           - This will linting a given Dockerfiles with hadolint
  ./docker-builder.sh lint-files [name]          - This will lint all Dockerfiles

  "
fi