$ git clone -n https://src.fedoraproject.org/rpms/plexus-build-api.git /var/lib/mock/f41-build-2030619-25291/root/chroot_tmpdir/scmroot/plexus-build-api
Cloning into '/var/lib/mock/f41-build-2030619-25291/root/chroot_tmpdir/scmroot/plexus-build-api'...
$ git fetch origin 33b189e29697c13b540978fd8bd23f8182955f91:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-build-api
 * [new ref]         33b189e29697c13b540978fd8bd23f8182955f91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 33b189e Switch javapackages tests to f41 branch