Spring Cloud Contract Stub Runner Docker fails to start if repository mounted in read-only mode

[jakub-bochenski]

Describe the bug Per https://docs.spring.io/spring-cloud-contract/docs/current/reference/html/docker-project.html#docker-stubrunner

If you want use the stubs that you have built locally, on your host, you should set the -e STUBRUNNER_STUBS_MODE=LOCAL environment variable and mount the volume of your local m2 (-v "${HOME}/.m2/:/home/scc/.m2:ro").

However doing that with an empty repository prevents the runner from starting, as it's trying to write there

Sample

Running Spring Cloud Contract Stub Runner
Please wait for the dependencies to be downloaded...
Exception in thread "main" java.lang.IllegalStateException: Cannot create directory for library at /home/scc/.m2/repository/org/springframework/boot/experimental/spring-boot-thin-launcher/1.0.30.RELEASE/spring-boot-thin-launcher-1.0.30.RELEASE-exec.jar
        at org.springframework.boot.loader.wrapper.ThinJarWrapper.download(ThinJarWrapper.java:169)
        at org.springframework.boot.loader.wrapper.ThinJarWrapper.launch(ThinJarWrapper.java:129)
        at org.springframework.boot.loader.wrapper.ThinJarWrapper.main(ThinJarWrapper.java:107)

[jakub-bochenski]

I think this could be solved if there were 2 repositories inside the docker image:

• one for local repository
• another location that you can mount host machine repository onto

I think I could simulate this by doing sth like:

docker run  --rm \
-e "STUBRUNNER_IDS=foo.bar:baz:+:stubs:9876" \
-e "STUBRUNNER_REPOSITORY_ROOT=file:///home/scc/contracts-repository" \
-e "STUBRUNNER_STUBS_MODE=REMOTE" \
-v '${HOME}/.m2/:/home/scc/contracts-repository:ro'
-p "8083:8083" \
-p "9876:9876" springcloud/spring-cloud-contract-stub-runner:4.1.1

but having a built in option for that would be nice.

[jakub-bochenski]

Above workaround will not work if you need to use a remote repository too :(

[marcingrzejszczak]

Why can't you just mount it in a read write mode? Ah, now I see, we mention this in the docs. Let me fix it

[jakub-bochenski]

Would still be nice to mount the repository in :ro mode for security