How to test dockerignore file?
To expand on VonC's suggestion, here's a sample build command you can use to create an image with the current folder's build context:
docker image build -t build-context -f - . <<EOFFROM busyboxCOPY . /build-contextWORKDIR /build-contextCMD find .EOFOnce created, run the container and inspect the contents of the /build-context directory which includes everything not excluded by the .dockerignore file:
# run the default find commanddocker container run --rm build-context# or inspect it from a shell usingdocker container run --rm -it build-context /bin/shYou can then cleanup with:
docker image rm build-context
To get a detailed analysis of the build context you could use pwaller/docker-show-context.
$ go get -v -u github.com/pwaller/docker-show-context$ cd ~/path/to/project/using/docker$ docker-show-contextIt outputs statistics about the build such as file sizes and upload times.