docker-image-tools.sh

#!/bin/bash
#
# Docker image tools shim.
#
# License: MIT

# Exit on any individual command failure.
set -e

##
## ENVIRONMENT SETUP
##
# shellcheck disable=SC2155
export GIT_PATH=$(command -v git)
# shellcheck disable=SC2155
export DOCKER_PATH=$(command -v docker)
# shellcheck disable=SC2155
export JQ_PATH=$(command -v jq)

# Versionned project
if [[ -f "VERSION" ]]; then
  # shellcheck disable=SC2155
  export PROJECT_VERSION=$(cat VERSION)
  echo "-> project version ${PROJECT_VERSION}"
fi

# Travis environment
if [[ "$TRAVIS" == "true" ]]; then
  echo '=> TRAVIS support'

  # shellcheck disable=SC2155
  export VCS_REF=$([[ "$TRAVIS_PULL_REQUEST" == "false" ]] && echo "$TRAVIS_COMMIT" || echo "$TRAVIS_PULL_REQUEST_SHA")
  # shellcheck disable=SC2155
  export VCS_BRANCH=$([[ "$TRAVIS_PULL_REQUEST" == "false" ]] && echo "$TRAVIS_BRANCH" || echo "$TRAVIS_PULL_REQUEST_BRANCH")
  
  if [[ ${TRAVIS_REPO_SLUG} =~ ([^/]+)/([^/]+) ]]; then
    export VCS_OWNER="${BASH_REMATCH[1]}"
    export VCS_NAME="${BASH_REMATCH[2]}"
  fi
fi

# Git project
if [[ -n "$GIT_PATH" && -d .git/ ]]; then
  echo '=> GIT support'

  # shellcheck disable=SC2155
  [[ -z "$VCS_REF" ]] && export VCS_REF=$(git rev-parse --short HEAD)
  echo "-> current vcs reference '${VCS_REF}'"

  # shellcheck disable=SC2155
  [[ -z "$VCS_BRANCH" ]] && export VCS_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
  echo "-> current vcs branch '${VCS_BRANCH}'"

  # shellcheck disable=SC2155
  [[ -z "$VCS_NAME" ]] && export VCS_NAME=$(basename "${PWD}")
  echo "-> current vcs name '${VCS_NAME}'"

  # shellcheck disable=SC2155
  export VCS_MASTER_BRANCH=${MASTER_BRANCH:-master}
  echo "-> default vcs master branch '${VCS_MASTER_BRANCH}'"
fi

# Docker project
if [[ -n "$DOCKER_PATH" ]]; then
  echo '=> DOCKER support'

  # docker hub username
  export DOCKERHUB_REGISTRY_USERNAME=wolvverine
  export DOCKER_USERNAME="${DOCKERHUB_REGISTRY_USERNAME}"
  echo "-> docker username ${DOCKER_USERNAME}"
  
  # image name => remove docker- prefix
  export DOCKER_IMAGE_NAME=${VCS_NAME#docker-}
  # full image path
  export DOCKER_IMAGE="${DOCKER_USERNAME}/${DOCKER_IMAGE_NAME}"
  echo "-> docker image ${DOCKER_IMAGE}"

  # if we are not on master branch, append branch as tags prefix
  if [[ "${VCS_BRANCH}" != "${VCS_MASTER_BRANCH}" ]]; then
    export DOCKER_IMAGE_TAG_BRANCH_PREFIX="${VCS_BRANCH}-"
    echo "-> docker branch tag prefix $DOCKER_IMAGE_TAG_BRANCH_PREFIX"
  fi
  # the name of the temporary file in which you can put produced
  # image tags
  export DOCKER_PRODUCED_TAGS_FILE=.docker_build_tags
  if [[ -f "$DOCKER_PRODUCED_TAGS_FILE" ]]; then
    rm -f "$DOCKER_PRODUCED_TAGS_FILE"
  fi
fi

# jq tool
if [[ -n "$JQ_PATH" ]]; then
  echo '=> JQ support'
fi



##
## FUNCTIONS
##
export docker_wait_for_logs_default_attempt=5

# Wait for a container to be up by checking regularly its logs for a pattern
# param1 : the container name
# param2 : the string to search for in logs
function wait_for_string_in_container_logs() {
  [[ -n "${1}" && -n "${2}" ]]
  attempt=0
  while [[ $attempt -le $docker_wait_for_logs_default_attempt ]]; do
    attempt=$((attempt + 1))
    echo "-> Waiting for container '${1}' to be up (attempt: ${attempt})..."
    if docker logs "${1}" | grep --quiet "${2}"; then
      echo "-> Container ${1} is up"
      return 0
    fi
    sleep 4
  done
  echo "-> Container ${1} is unable to be up until ${docker_wait_for_logs_default_attempt} attempts"
  return 1
}

# Stop and remove properly a container
# param1 : the container name
function stop_and_remove_container() {
  [[ -n "${1}" ]]
  docker stop "${1}" > /dev/null
  docker rm --volumes "${1}" > /dev/null
  echo "-> Container ${1} is stopped and removed"
}