How to prevent Dockerfile caching git clone

Question

I have a Dockerfile trying to package and deploy a web app to a container. The code of app fetches from git repository during Docker image building. Here\'s the Dockerfile s

Answer 1

Another workaround:

If you use GitHub (or gitlab or bitbucket too most likely) you can ADD the GitHub API's representation of your repo to a dummy location.

ADD https://api.github.com/repos/$USER/$REPO/git/refs/heads/$BRANCH version.json
RUN git clone -b $BRANCH https://github.com/$USER/$REPO.git $GIT_HOME/

The API call will return different results when the head changes, invalidating the docker cache.

If you're dealing with private repos you can use github's x-oauth-basic authentication scheme with a personal access token like so:

ADD https://$ACCESS_TOKEN:x-oauth-basic@api.github.com/repos/$USER/$REPO/git/refs/heads/$BRANCH version.json

(thx @captnolimar for a suggested edit to clarify authentication)