Dockerized Protoc

This repository holds receipts for production of Dockerized protoc plugin for Elixir. We use these Docker images in the development process accross our Elixir projects in order to make sure that every team member uses the same protoc version.

Usage

Docker run should be executed with the following options set:

• assign local directories to the following Docker container volumes /home/protoc/code and /home/protoc/source
  • /home/protoc/code - working directory ($PWD in the following example)
  • /home/protoc/source - directory that contains already generated protos ($TMP_PROTO_DIR)
• specify the protos output path within your local environment ($PROTO_OUTPUT_DIR)
• specify Docker container path of the target proto file (ie. file that needs to be compiled with protoc and is present in $TMP_PROTO_DIR locally; eg. /home/protoc/source/user.proto)
• specify Docker protoc image tag ($PROTOC_IMG_VSN); when not specified latest will be used

docker run --rm -v $PWD:/home/protoc/code -v $TMP_PROTO_DIR:/home/protoc/source \
  renderedtext/protoc:$PROTOC_IMG_VSN protoc -I /home/protoc/source -I /home/protoc/source/include \
  --elixir_out=plugins=grpc:$PROTO_OUTPUT_DIR \
  --plugin=/root/.mix/escripts/protoc-gen-elixir /home/protoc/source/user.proto

Deployment

New Docker image deployment is managed with the following promotions within docker-protoc Semaphore project:

• parametrized promotion
• legacy promotion

Resulting Docker images are tagged (as described below) and pushed to Dockerhub repository (renderedtext/protoc).

Parametrized promotion

Available parameters:

• Elixir version (required, default v1.11.4)
• protoc version (required, default 3.17.3) latest version can be found here: https://github.com/protocolbuffers/protobuf/tags
• Protobuf version (optional)

This promotion constructs a tag in the following form:

<elixir_version>-<protoc_version>-<protobuf_version>

Legacy promotion

This promotion relies on make build and make push target sequences. Produced image is pushed to repository with latest and git commit sha tags. It is based on Elixir v1.8.2, Protobuf v0.5.4 and protoc v3.3.0. This image is used by some of projects in the production (eg. UI project front).