[DEPRECATED] check @zudsniper/bashbits | [ChatGPT-4] A tool to merge docker images simply on the command line via a multilayer Dockerfile.

README.md

Docker Image Merger

This repository contains two versions of a script that merges multiple Docker images into a single image by layering them on top of each other. It supports both local and Docker Hub images and provides options to reverse the layer order, disable cache when building, and output a Dockerfile instead of creating the merged image.

V1 Deprecated

Version 1 (v1)

Filename: docker_merge_old.sh

Usage

./docker_merge_old.sh [-r] [-f] -i <image_names> -o <origins> -n <output_name>

Options

• -r, --reverse: Reverse the order of provided Docker images
• -f, --file-only: Output a Dockerfile instead of exporting the image
• -i, --images <image_names>: Comma-separated list of Docker image names
• -o, --origins <origins>: Comma-separated list of origins (0 for local, 1 for Docker Hub)
• -n, --name <output_name>: Name of the output merged image

Version 2 (v2)

Filename: docker_merge.sh

Usage

./docker_merge.sh [-r] [-f] [-nc] [-ad|-al] -i <image_names> [-o <origins>] -n <output_name>

Options

• -r, --reverse: Reverse the order of provided Docker images
• -f, --file-only: Output a Dockerfile instead of exporting the image
• -nc, --no-cache: Disable cache when building the image
• -ad, --all-dockerhub: Treat all images as Docker Hub images
• -al, --all-local: Treat all images as local images
• -i, --images <image_names>: Comma-separated list of Docker image names
• -o, --origins <origins>: Comma-separated list of origins (0 for local, 1 for Docker Hub, optional with -ad or -al)
• -n, --name <output_name>: Name of the output merged image

Examples

Merging Docker Hub images

./docker_merge.sh -ad -i user/image1,user/image2,user/image3 -n merged_image

Merging mixed images

./docker_merge.sh -i local_image,user/docker_hub_image -o 0,1 -n merged_image

Merging images and outputting a Dockerfile

./docker_merge.sh -f -ad -i user/image1,user/image2,user/image3 -n merged_image

Merging images with reversed order and no cache

./docker_merge.sh -r -nc -al -i local_image1,local_image2,local_image3 -n merged_image

docker_merge.sh

#!/bin/bash
# docker_merge.sh v2 by ChatGPT-4
# used to merge 2 or more docker images into a single new image via a multilayered Dockerfile being constructed then built.  
# !! new to v2 -- added new CLI options to avoid inputting origins array if input is simple enough to warrant doing so.
# ----------------------------- #
# Human: @zudsniper 
# i'm afraid

set -e

# Check if Docker is installed
if ! command -v docker &> /dev/null; then
    echo "Error: Docker is required but not installed. Please install Docker and try again."
    exit 1
fi

# Define colors for logs
RED='\033[0;31m'
GREEN='\033[0;32m'
NC='\033[0m'

# ProgressBar function
function progress_bar {
    local width=40
    local percent=$1
    local filled=$((width * percent / 100))
    local empty=$((width - filled))
    printf "${GREEN}["
    for ((i = 0; i < filled; i++)); do printf "#"; done
    for ((i = 0; i < empty; i++)); do printf " "; done
    printf "]${NC} %3d%%\r" $percent
}

function usage {
    echo -e "Usage: $0 [-r] [-f] [-nc] [-ad|-al] -i <image_names> [-o <origins>] -n <output_name>"
    echo -e "\n    HINT - The FIRST image provided in both lists will be the OUTERMOST image, unless -r is used.\n"
    echo "  -r,  --reverse             Reverse the order of provided docker images"
    echo "  -f,  --file-only           Output a Dockerfile instead of exporting the image"
    echo "  -nc, --no-cache            Disable cache when building the image"
    echo "  -ad, --all-dockerhub       Treat all images as Docker Hub images"
    echo "  -al, --all-local           Treat all images as local images"
    echo "  -i,  --images <image_names> Comma-separated list of docker image names"
    echo "  -o,  --origins <origins>    Comma-separated list of origins (0 for local, 1 for Docker Hub, optional with -ad or -al)"
    echo "  -n,  --name <output_name>   Name of the output merged image"
    exit 1
}

if [ $# -eq 0 ]; then
    usage
fi

REVERSE=false
FILE_ONLY=false
NO_CACHE=false
ALL_DOCKERHUB=false
ALL_LOCAL=false
ORIGINS=""

while [[ $# -gt 0 ]]; do
    case "$1" in
        -r|--reverse)
            REVERSE=true
            shift
            ;;
        -f|--file-only)
            FILE_ONLY=true
            shift
            ;;
        -nc|--no-cache)
            NO_CACHE=true
            shift
            ;;
        -ad|--all-dockerhub)
            ALL_DOCKERHUB=true
            shift
            ;;
        -al|--all-local)
            ALL_LOCAL=true
            shift
            ;;
        -i|--images)
            IMAGES="$2"
            shift 2
            ;;
        -o|--origins)
            ORIGINS="$2"
            shift 2
            ;;
        -n|--name)
            OUTPUT_NAME="$2"
            shift 2
            ;;
        -h|--help)
            usage
            ;;
        *)
            usage
            ;;
    esac
done

if [ -z "$IMAGES" ] || [ -z "$OUTPUT_NAME" ]; then
    usage
fi

if [ "$ALL_DOCKERHUB" = true ] && [ "$ALL_LOCAL" = true ]; then
    echo -e "${RED}Error: You cannot use both --all-dockerhub and --all-local at the same time.${NC}"
    exit 1
fi

IFS=',' read -ra IMAGE_ARRAY <<< "$IMAGES"

if [ -z "$ORIGINS" ]; then
    if [ "$ALL_DOCKERHUB" = true ]; then
        ORIGINS=$(printf '1%.0s' $(seq 1 ${#IMAGE_ARRAY[@]}))
    elif [ "$ALL_LOCAL" = true ]; then
        ORIGINS=$(printf '0%.0s' $(seq 1 ${#IMAGE_ARRAY[@]}))
    else
        echo -e "${RED}Error: You must provide either --all-dockerhub, --all-local, or -o flag with origins.${NC}"
        exit 1
    fi
fi

IFS=',' read -ra ORIGIN_ARRAY <<< "$ORIGINS"

if [ ${#IMAGE_ARRAY[@]} -ne ${#ORIGIN_ARRAY[@]} ]; then
    echo -e "${RED}Error: The length of image_names and origins must be equal.${NC}"
    exit 1
fi

if [ "$REVERSE" = true ]; then
    IMAGE_ARRAY=("${IMAGE_ARRAY[@]}" | tac)
    ORIGIN_ARRAY=("${ORIGIN_ARRAY[@]}" | tac)
fi

DOCKERFILE="Dockerfile.$OUTPUT_NAME"

echo "FROM ${IMAGE_ARRAY[0]}" > $DOCKERFILE
for ((i = 1; i < ${#IMAGE_ARRAY[@]}; i++)); do
    if [ ${ORIGIN_ARRAY[$i]} -eq 1 ]; then
        docker pull "${IMAGE_ARRAY[$i]}"
    fi
    echo "COPY --from=${IMAGE_ARRAY[$i]} / /" >> $DOCKERFILE
    progress=$((100 * i / ${#IMAGE_ARRAY[@]}))
    progress_bar $progress
done
progress_bar 100
echo

BUILD_OPTIONS=""
if [ "$NO_CACHE" = true ]; then
    BUILD_OPTIONS="--no-cache"
fi

if [ "$FILE_ONLY" = true ]; then
    echo -e "${GREEN}Dockerfile generated:${NC} $DOCKERFILE"
else
    docker build $BUILD_OPTIONS -t "$OUTPUT_NAME" -f $DOCKERFILE .
    echo -e "${GREEN}Merged image created:${NC} $OUTPUT_NAME"
fi

docker_merge_old.sh

#!/bin/bash
# **** DEPRECATED ****
# docker_merge.sh v1 by ChatGPT-4
# used to merge 2 or more docker images into a single new image via a multilayered Dockerfile being constructed then built. 
# ----------------------------- #
# Human: @zudsniper 

set -e

# Check if Docker is installed
if ! command -v docker &> /dev/null; then
    echo "Error: Docker is required but not installed. Please install Docker and try again."
    exit 1
fi

# Define colors for logs
RED='\033[0;31m'
GREEN='\033[0;32m'
NC='\033[0m'

# ProgressBar function
function progress_bar {
    local width=40
    local percent=$1
    local filled=$((width * percent / 100))
    local empty=$((width - filled))
    printf "${GREEN}["
    for ((i = 0; i < filled; i++)); do printf "#"; done
    for ((i = 0; i < empty; i++)); do printf " "; done
    printf "]${NC} %3d%%\r" $percent
}

function usage {
    echo -e "Usage: $0 [-r] [-f] -i <image_names> -o <origins> -n <output_name>"
    echo "  -r, --reverse             Reverse the order of provided docker images"
    echo "  -f, --file-only           Output a Dockerfile instead of exporting the image"
    echo "  -i, --images <image_names> Comma-separated list of docker image names"
    echo "  -o, --origins <origins>    Comma-separated list of origins (0 for local, 1 for Docker Hub)"
    echo "  -n, --name <output_name>   Name of the output merged image"
    exit 1
}

if [ $# -eq 0 ]; then
    usage
fi

REVERSE=false
FILE_ONLY=false

while [[ $# -gt 0 ]]; do
    case "$1" in
        -r|--reverse)
            REVERSE=true
            shift
            ;;
        -f|--file-only)
            FILE_ONLY=true
            shift
            ;;
        -i|--images)
            IMAGES="$2"
            shift 2
            ;;
        -o|--origins)
            ORIGINS="$2"
            shift 2
            ;;
        -n|--name)
            OUTPUT_NAME="$2"
            shift 2
            ;;
        *)
            usage
            ;;
    esac
done

if [ -z "$IMAGES" ] || [ -z "$ORIGINS" ] || [ -z "$OUTPUT_NAME" ]; then
    usage
fi

IFS=',' read -ra IMAGE_ARRAY <<< "$IMAGES"
IFS=',' read -ra ORIGIN_ARRAY <<< "$ORIGINS"

if [ ${#IMAGE_ARRAY[@]} -ne ${#ORIGIN_ARRAY[@]} ]; then
    echo -e "${RED}Error: The length of image_names and origins must be equal.${NC}"
    exit 1
fi

if [ "$REVERSE" = true ]; then
    IMAGE_ARRAY=("${IMAGE_ARRAY[@]}" | tac)
    ORIGIN_ARRAY=("${ORIGIN_ARRAY[@]}" | tac)
fi

DOCKERFILE="Dockerfile.$OUTPUT_NAME"

echo "FROM ${IMAGE_ARRAY[0]}" > $DOCKERFILE
for ((i = 1; i < ${#IMAGE_ARRAY[@]}; i++)); do
    if [ ${ORIGIN_ARRAY[$i]} -eq 1 ]; then
        docker pull "${IMAGE_ARRAY[$i]}"
    fi
    echo "COPY --from=${IMAGE_ARRAY[$i]} / /" >> $DOCKERFILE
    progress=$((100 * i / ${#IMAGE_ARRAY[@]}))
    progress_bar $progress
    progress=$((100 * i / ${#IMAGE_ARRAY[@]}))
    progress_bar $progress
done
progress_bar 100
echo

if [ "$FILE_ONLY" = true ]; then
    echo -e "${GREEN}Dockerfile generated:${NC} $DOCKERFILE"
else
    docker build -t "$OUTPUT_NAME" -f $DOCKERFILE .
    echo -e "${GREEN}Merged image created:${NC} $OUTPUT_NAME"
fi