$ git clone -n https://src.fedoraproject.org/rpms/Mayavi.git /var/lib/mock/f38-build-side-42-init-devel-836027-28392/root/chroot_tmpdir/scmroot/Mayavi
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-836027-28392/root/chroot_tmpdir/scmroot/Mayavi'...
$ git fetch origin 78ce0d29c62cfa5a102ae59beb52161935845f21:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/Mayavi
 * [new ref]         78ce0d29c62cfa5a102ae59beb52161935845f21 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 78ce0d2 Fix shebang in runtests.py