Dockerize script that can be used to build and push a Docker image from any Git repo that has a Dockerfile. This script uses the git commit sha as the docker tag.

dockerize

#!/bin/bash

# dockerize
# Albert Tedja <[email protected]>

# Color stuff
yellow='\e[1;33m'
nc='\e[0m'
color=$yellow


ctrl_c () {
  echo
  info "CTRL-C pressed. TERMINATED BY USER"
  exit $?
}
trap ctrl_c INT


info () {
  echo -e "${color}[dockerize] ${1}${nc}"
}

# Grab flags
while getopts bpr opts; do
  case ${opts} in
    b) BUILD=true ;;
    p) PUSH=true ;;
    r) REBUILD=true ;;
  esac
done

# Show usage if -b and -p are not specified
if [[ -z $BUILD ]] && [[ -z $REBUILD ]] ; then
  echo -e "Simplify building, pushing, and running docker images."
  echo -e "Usage:"
  echo -e "\tdockerize [OPTIONS]\n"
  echo -e "Options:"
  echo -e "\t-b\tBuild image."
  echo -e "\t-p\tPush image to the registry."
  echo -e "\t-r\tRebuild by removing existing image with the same name and tag."
  echo
  echo -e "Example:"
  echo -e "\tdockerize -bp"
  exit 1
fi

# Docker user. Replace
DOCKER_USER="localhost:5000"

APPLICATION_NAME=$(basename `pwd`)
IMAGE_TAG="latest"
IMAGE_ID="${DOCKER_USER}/${APPLICATION_NAME}"
IMAGE_ID_TAG="${IMAGE_ID}:${IMAGE_TAG}"

if [ -d ".git" ]; then
  info "Git Repository detected. Using the latest commit as tag"

  # Construct image name and tag from git repo
  GIT_REPO_NAME=$(basename `git remote show -n origin | grep Fetch | cut -d: -f2-` | sed 's/.git//')
  GIT_REPO_COMMIT=$(git log -n 1 --pretty=format:"%H")
  GIT_REPO_COMMIT_SHORT=${GIT_REPO_COMMIT:0:8}

  APPLICATION_NAME=$GIT_REPO_NAME
  IMAGE_TAG=$GIT_REPO_COMMIT_SHORT
  IMAGE_ID="${DOCKER_USER}/${APPLICATION_NAME}"
  IMAGE_ID_TAG="${IMAGE_ID}:${IMAGE_TAG}"
fi

info "Application name: ${APPLICATION_NAME}"
info "Commit: ${IMAGE_TAG}"
info "Image: ${IMAGE_ID_TAG}"

# Check for existing image
exist=$(docker images | grep $APPLICATION_NAME | grep $IMAGE_TAG)

# Rebuild. Always delete existing image.
if [[ -n $REBUILD ]] ; then
  if [[ -n $exist ]]; then
    info "Removing old image."
    docker rmi $IMAGE_ID_TAG
  fi

  set -e
  info "Building image"
  docker build --no-cache -t $IMAGE_ID_TAG .
  docker tag $IMAGE_ID_TAG $IMAGE_ID:latest
  set +e
fi

# Build
if [[ -n $BUILD ]] ; then
  if [[ -z $exist ]]; then
    set -e
    info "Building image"
    docker build --no-cache -t $IMAGE_ID_TAG .
    docker tag $IMAGE_ID_TAG $IMAGE_ID:latest
    set +e
  else
    info "Image already exist."
  fi
fi

# Push
if [[ -n $PUSH ]] ; then
  info "Pushing to registry"
  docker push $IMAGE_ID_TAG
  docker push $IMAGE_ID:latest
fi

echo $IMAGE_ID_TAG