Harpoon is a go library and command line tool to pull a Docker image from any source and load it into Docker.
This works by manually downloading the manifest and each layer blob and metadata, then assembling this into a .tar.gz file that is compatible with a docker load command. Then, harpoon will actually load the image into Docker.

harpoon pull <image_uri>

Possible flags: --proxy <value> Use this http(s) proxy server when pulling the image --no-cache Ignore the docker cache, if available. --no-load Download and leave the image as a .tar.gz file without loading it into Docker. --force-v1 Force use of the v1 registry protocol. --username The username to authenticate to the registry with. --password The password to authenticate to the registry with. --token Use the supplied token to pull the image. (Not compatible with registry protocol v1 or v2 (only v2.2))

Image URI should be in the format of: docker://<server>/<namespace>/<image>:<tag>

Examples: Pull the public, official nginx container: docker://nginx

Pull a private image from docker hub named "priv", tag "abc", owned by docker hub organization "org": docker://org/priv:abc

Pull a private image from quay.io named "priv", tag "abc", owned by quay.io organization "org": docker://quay.io/org/priv:abc

Some tests require credentials to interact with Docker hub. No data will be changed, but you should supply the required data in the environment before running the tests.

export DOCKERHUB_USERNAME=<a valid dockerhub username>
export DOCKERHUB_PASSWORD=<a valid dockerhub password>
make test