Docker compose caching via yq

caching.sh

#!/usr/bin/env bash

# Check for Docker CLI
if ! command -v docker &> /dev/null
then
    echo "Docker CLI not found. Please install Docker."
    exit 1
fi

# Check for yq CLI
if ! command -v yq &> /dev/null
then
    echo "yq CLI not found. Please install yq."
    exit 1
fi

# Check for docker-compose.yaml
if [ ! -f ./docker-compose.yaml ]; then
    echo "docker-compose.yaml not found. Please ensure the file exists in the current directory."
    exit 1
fi

# Set up necessary environment variables if not already set
: "${DOCKER_IMAGE:=your_default_docker_image}"
: "${DOCKER_REGISTRY:=your_default_docker_registry}"
: "${DOCKER_USER:=your_default_docker_user}"
: "${DOCKER_PASSWORD:=your_default_docker_password}"

# Preflight script for cacher-preflight
working_dir=$(dirname "$(realpath ./docker-compose.yaml)")
temp_file="$working_dir/docker-compose.caching.yaml"
export CACHE_COMPOSE_PATH=$temp_file
export DOCKER_BUILDKIT=1

# Copy into cache path, and add caching
cp ./docker-compose.yaml $CACHE_COMPOSE_PATH
services=$(yq -r '.services | keys | .[]' ./docker-compose.yaml)
for service in $services; do
  yq eval -i ".services.${service}.build.cache_from[0] = \"type=registry,ref=$DOCKER_IMAGE:${service}-buildcache\"" $CACHE_COMPOSE_PATH
  yq eval -i ".services.${service}.build.cache_to[0] = \"type=registry,ref=$DOCKER_IMAGE:${service}-buildcache,mode=max\"" $CACHE_COMPOSE_PATH
done

# Build script for build
docker buildx create --use

# After using buildx, you will need to relogin into docker.
echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USER" --password-stdin $DOCKER_REGISTRY

docker compose -f $CACHE_COMPOSE_PATH build
docker compose -f $CACHE_COMPOSE_PATH push