Using local dependencies when docker container is building

Question

I have a service which transitively relies on some library (which is also being developed by me). The only way to test if the library changes are correct is to run the service.

How could I do it locally

I have two versions of that library:

• Stable version inside vendor folder
• Actual one with untested changes inside GOPATH

So I can just remove it from vendor and go build will work correctly using the version from GOPATH .

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The question is what is the best way to achieve the same behavior using docker ?
The obvious solution is just copy of local GOPATH into the container on build stage, but GOPATH size is very big and such approach is too expensive.

Answer 1

Why don't you try to mount the library folder to container and define path in dockerfile, that way your image wont be large and the path will fetch you the dependent libraries from the mounted directory.