User adapting Entrypoint for Docker

Original repository at github.

What does it solve?

Problem

• run container with current host user uid/gid ("worker user")
• how provide home directory when uid/gid of worker user not known at build time
• how to grant access to docker.socket to worker user

Solution

• run container and entrypoint as root
• create user/group entry for worker user on startup
• add user to docker group when docker.sock provided
• execute command as worker user

Build

docker build --tag docker-user-adapting-entrypoint:local .

Run

# WORKER_ vars are optional
docker run -ri --rm \
	-e WORKER_UID=$(id -u) \
	-e WORKER_GID=$(id -g) \
	-e WORKER_HOME=/home/sweethome \
	-e WORKER_NAME=wrkr \
	-v volume-in-work-dir:/work \
	docker-user-adapting-entrypoint:local bash

Run (with docker access from within container)

# WORKER_ vars are optional
docker run -ri --rm \
	-e WORKER_UID=$(id -u) \
	-e WORKER_GID=$(id -g) \
	-e WORKER_HOME=/home/sweethome \
	-e WORKER_NAME=wrkr \
	-v volume-in-work-dir:/work \
	-v /var/run/docker.sock:/var/run/docker.sock \
	docker-user-adapting-entrypoint:local bash

License

Written by Cornelius Buschka.

MIT License