$ git clone -n https://src.fedoraproject.org/rpms/mirrormanager2.git /var/lib/mock/f41-build-side-1-2806287-32867/root/chroot_tmpdir/scmroot/mirrormanager2
Cloning into '/var/lib/mock/f41-build-side-1-2806287-32867/root/chroot_tmpdir/scmroot/mirrormanager2'...
$ git fetch origin 155a48f01dbe9c12ab3a25af40dff640f184150a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mirrormanager2
 * [new ref]         155a48f01dbe9c12ab3a25af40dff640f184150a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 155a48f convert license to SPDX