Hi Docker Community
I am having trouble listing the tags in a repository from the command line. The repository is private so I have to authenticate and to do this I have been following the process described in the docs at https://docs.docker.com/registry/spec/auth/token/ to obtain an authentication token.
I first send a GET request for the tags of the private repo and then I use the service and scope given in the WWW-Authenticate response header to request an authentication token. I then repeat the original GET request and include the received token as a bearer token in the authentication header. When I first started working on this a few weeks ago, this process worked correctly and the tags that I requested were sent back. I then tried to do the same thing the next day and I could no longer get the tags with this process. Since then I have tried again periodically and it still isn’t working for me.
What is happening now is that when I send the first unauthorised request to the private repo, I get a 404 response instead of the 401 that the docs say I should get back.
Below are the commands that I’m using to get my basic auth, token and the final request to get the tags. I don’t know why I’m not getting the responses that the docs say I should be getting and I can’t work out how to make this authentication process work. Any help would be greatly appreciated.
DOCKER_KEY=$(cat ~/.docker/config.json | jq '.auths["https://index.docker.io/v1/"].auth')
TOKEN=$(curl -X GET https://auth.docker.io/token?service=registry.docker.io&scope=repository:${REPO}:pull -H "Authorization: Basic ${DOCKER_KEY}") | jq -r .token
curl -s -X GET https://registry.hub.docker.com/v2/repositories/${REPO}/tags/ -H "Authorization: Bearer ${TOKEN}"