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

Issue 1996 is not yet available, but you have the following workaround:

FROM foo
ARG CACHE_DATE=2016-01-01
RUN git clone ...

docker build --build-arg CACHE_DATE=$(date) ....

That would invalidate cache after the ARG CACHE_DATE line for every build.

Or:

ADD http://www.convert-unix-time.com/api?timestamp=now /tmp/bustcache
RUN git pull

That would also invalidate cache after this ADD line.

Similar idea:

Add ARG command to your Dockerfile:

# Dockerfile
# add this and below command will run without cache
ARG CACHEBUST=1

When you need to rebuild with selected cache, run it with --build-arg option

$ docker build -t your-image --build-arg CACHEBUST=$(date +%s) .

then only layer below ARG command in Dockerfile will rebuild.