Prior this commit we only had support for username/password authentication
in the koji integration. This wasn't particularly useful because this
auth type isn't used in any production instance.
This commit adds the support for GSSAPI/Kerberos authentication.
The implementation uses kerby library which is very lightweight wrapper
around C gssapi library.
Also, the koji unit test and the run-koji-container script were modified
so the GSSAPI auth is fully tested.
Previously, Koji instance could be both logged-in and not logged-in.
This change disallows it: Now, the Koji instance is created by calling
koji.Login, so it must be always logged-in. This change should lead to more
robust code.
This does not yet actually upload the image, and it only supports empty
images. You need to place a an empty file named <filename>, with a valid
extension (e.g., .qcow2) in /mnt/koji/work/<directory>/.
Signed-off-by: Tom Gundersen <teg@jklm.no>
