$ git clone -n https://src.fedoraproject.org/rpms/plexus-build-api0.git /var/lib/mock/f41-build-2030627-25291/root/chroot_tmpdir/scmroot/plexus-build-api0
Cloning into '/var/lib/mock/f41-build-2030627-25291/root/chroot_tmpdir/scmroot/plexus-build-api0'...
$ git fetch origin e40cf780777b8dc9c3abdd754b6e3d9cb406b20c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-build-api0
 * [new ref]         e40cf780777b8dc9c3abdd754b6e3d9cb406b20c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e40cf78 Switch javapackages tests to f41 branch