Testcontainers-java: Testcontainers.exposeHostPorts not working when offline

[vmassol]

The problem can be debugged in RemoteDockerImage#resolve.
The call to List<Image> updatedImages = (List)listImagesCmd.exec() returns the sshd image but it has a null repoTags. Thus AVAILABLE_IMAGE_NAME_CACHE is not updated with it and it's pulled.

$ docker inspect e716acb1cdb2 [ { "Id": "sha256:e716acb1cdb228671503beae1f4048b711f7edcab5f1b0decaf7e380ce14e312", "RepoTags": [], "RepoDigests": [ "quay.io/testcontainers/sshd@sha256:18aa929c653284189fc9cefa45b731021857b6047a0a1757e909f958f258f088" ], ..

@rnorth said:

Hmm, this could be a bug introduced during the refactoring of image identity handling (related to registry auth)

[vmassol]

I'm on TC 1.11.1.

[rnorth]

I've done some digging and put together a test that confirms this.

There are two problems:

1. As identified and solved by @bsideup, the default TestcontainersConfiguration for the sshd image uses a SHA256-versioned image rather than an image tag. This can be worked around via a properties file to override the default sshd image (see docs, although this option is not explicitly documented)
2. Testcontainers' image indexing code can't handle images that have SHA256 digests. We need a way to access the RepoDigests from docker-java's Image class. Unless I'm missing something, at the moment only RepoTags is mapped.

I'll raise a PR to fix issue (1), and a separate issue to track (2).

[rnorth]

Released in 1.11.2!

[vmassol]

Thanks @rnorth , will try it later today :)

[vmassol]

Confirmed that it works! Thanks again