$ git clone -n https://src.fedoraproject.org/rpms/mirrormanager2.git /var/lib/mock/f40-build-2057457-49124/root/chroot_tmpdir/scmroot/mirrormanager2
Cloning into '/var/lib/mock/f40-build-2057457-49124/root/chroot_tmpdir/scmroot/mirrormanager2'...
$ git fetch origin 0e6c517757ea20f335dcd84cd07ec62b415869e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mirrormanager2
 * [new ref]         0e6c517757ea20f335dcd84cd07ec62b415869e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0e6c517 Rediff patch