Pulp registry can accept basic auth credentials only in plain text. Nowadays these credentials very often are based64 encoded and stored in the auth.json file. Pulp Registry is not able to use already encoded credentials, as a result it produces bad user experience where users are forced to decode the credentials manually and provide them to Pulp Registry.
Pull secret Secret pull is a base64 encoded username+password. It can contain credentials to multiple registries.
Add an option called `pull-secret` `--secret-pull` which will accept the absolute path to the secret pull secret file info in the json format. Pulp will parse it and extract the `auth` part which will be used in the Basic auth headers and sent to the external registry.
Example of a pull secret can be obtained here https://cloud.redhat.com/openshift/install/pre-release or perform 'podman login' and look for the created auth file http://docs.podman.io/en/latest/markdown/podman-login.1.html