$ git clone -n https://src.fedoraproject.org/rpms/cantor.git /var/lib/mock/f41-build-side-1-2656040-28431/root/chroot_tmpdir/scmroot/cantor
Cloning into '/var/lib/mock/f41-build-side-1-2656040-28431/root/chroot_tmpdir/scmroot/cantor'...
$ git fetch origin 8f77ae109a6461bd6fff70665ce3f578d1c05866:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cantor
 * [new ref]         8f77ae109a6461bd6fff70665ce3f578d1c05866 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8f77ae1 Fix upgrade path for disabled backends