dockerfile-source-checksum

README

docker-source-checksum

Calculates deterministic checksum of a Dockerfile from source.

The checksum is calculated from:

• Content of the dockerfile
• Content of local paths added in the dockerfile, from:
  • ADD command
  • COPY command that copies from local directory
  • RUN command that uses --mount=type=bind
• Parameters from docker build:
  • --build-arg
  • --platform
  • --label

Inspired by github.com/dpc/docker-source-checksum. The major difference is that this tool supports directory from RUN --mount=type=bind and handles variable expansion in dockerfile.

Install

TODO: add binary release

go install github.com/inoc603/dockerfile-source-checksum@latest

Usage

dockerfile-source-checksum -f Dockerfile .

dockerfile-source-checksum \
    -f Dockerfile \
    --build-arg key1=value1 \
    --build-arg key2=value2 \
    --platform linux/amd64 \
    --platform linux/arm64/v8 \
    --label labe1=labelvalue1 \
    .