Build images from a docker compose file and tag them with current commit hash and tags

docker-build-images.sh

#!/bin/bash

# Docker registry to use to tag and push images
REGISTRY="" # If not set use Docker Hub

# Default compose file to use
COMPOSE_FILE="docker-compose.build.yml"

# Git info
GIT_COMMIT_HASH="$(git rev-parse HEAD)"
GIT_COMMIT_TAGS="$(git tag --points-at HEAD)"

# Command options defaults
HELP=false
PUSH=false

help() {
    echo "Build images from a docker compose file and tag them with current commit hash and tags."
    echo
    echo "Usage:    $0 [OPTIONS] [COMPOSE_FILE]"
    echo
    echo "Options:"
    echo "-h, --help    print this help message"
    echo "--push        push built images to the registry"
    echo
}

build() {
    echo "Building..."

    docker compose -f "$COMPOSE_FILE" build \
        --pull \
        --build-arg GIT_COMMIT_HASH="$GIT_COMMIT_HASH" || exit 1
}

tag_and_push() {
    IMAGES="$(docker compose -f "$COMPOSE_FILE" config --images)"

    while IFS= read -r IMAGE || [[ -n $IMAGE ]]; do
        while IFS= read -r TAG || [[ -n $TAG ]]; do
            REMOTE_IMAGE="$IMAGE:$TAG"
            if [ -n "$REGISTRY" ]; then
                REMOTE_IMAGE="$REGISTRY/$REMOTE_IMAGE"
            fi

            echo "Tagging $IMAGE as $REMOTE_IMAGE"
            docker image tag "$IMAGE" "$REMOTE_IMAGE" || (echo "Tagging failed" 1>&2 && exit 1)

            if [ "$PUSH" = true ]; then
                echo "Pushing $REMOTE_IMAGE"
                docker image push "$REMOTE_IMAGE" || (echo "Push failed" 1>&2 && exit 1)
            fi

        done < <(printf '%s\n%s' "$GIT_COMMIT_HASH" "$GIT_COMMIT_TAGS")
    done < <(printf '%s' "$IMAGES")
}

# Parse options
while getopts :h-: OPT; do # allow -h, and -- "with arg"
    # support long options: https://stackoverflow.com/a/28466267/519360
    if [ "$OPT" = "-" ]; then   # long option: reformulate OPT and OPTARG
        OPT="${OPTARG%%=*}"     # extract long option name
        OPTARG="${OPTARG#$OPT}" # extract long option argument (may be empty)
        OPTARG="${OPTARG#=}"    # if long option argument, remove assigning `=`
    fi
    case "$OPT" in
    h | help) HELP=true ;;
    push) PUSH=true ;;
    *) help && exit 2 ;; # option
    esac
done
shift $((OPTIND - 1)) # remove parsed options and args from $@ list

if [ -n "$1" ]; then
    COMPOSE_FILE="$1"
fi

if [ "$HELP" = true ]; then
    help
    exit 0
fi

build
tag_and_push

docker-compose.build.yml

services:
  youservice:
    image: project/youservice
    build: ./sourcefolder