buildkit + gcr.io private repos (credHelpers) do not stack #720
Description
Docker 18.09-ce here.
I have FROM directive in my dockerfile pointing to a private registry:
FROM gcr.io/...
Running DOCKER_BUILDKIT=1 docker build . with this Dockerfile never finishes (after 5 minutes I hit CTRL-C).
Without buildkit it builds fine in seconds.
My ~/.docker/config.json is as follows:
{
"credHelpers": {
"us.gcr.io": "gcloud",
"staging-k8s.gcr.io": "gcloud",
"asia.gcr.io": "gcloud",
"gcr.io": "gcloud",
"marketplace.gcr.io": "gcloud",
"eu.gcr.io": "gcloud"
}
}
After waiting long time and pressing CTRL-C, the following error is printed (exact image names scrambled with ...):
------
> [stage-1 1/4] FROM gcr.io/...:
------
failed to copy: httpReaderSeeker: failed open: unexpected status code https://gcr.io/v2/...: 403 Forbidden
Bug?