I notice in the source for the drone plugin,
docker build is always run with the
I have docker files that are structured to utilize layer caching where possible, with things like:
FROM golang:1.13 as builder WORKDIR /app COPY go.mod . COPY go.sum . RUN go mod download COPY . . RUN go build -o myApp ./
If run repeatedly on the same agent, I would hope that the module downloading would take advantage of the docker layer cache, and it does if I run docker build myself. But in drone, the --rm flag causes docker to clean up the intermediate images, and every build takes pretty constant time.
I’d like to have an option to disable that feature. There is already the
purge argument to the plugin, and I assumed that would do what I want. Took some digging in the logs to realize
purge still doesn’t preserve the intermediate containers.
I’d prefer just re-using the
purge flag, but I could see maybe adding a new one if that is problematic. Would you accept a pull request to that effect?