$ git clone -n https://src.fedoraproject.org/rpms/xfdesktop.git /var/lib/mock/f45-build-38839-728/root/chroot_tmpdir/scmroot/xfdesktop
Cloning into '/var/lib/mock/f45-build-38839-728/root/chroot_tmpdir/scmroot/xfdesktop'...
$ git fetch origin a4471ea6429879d5e9a5448bfcd90bc25f064dc9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfdesktop
 * [new ref]         a4471ea6429879d5e9a5448bfcd90bc25f064dc9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4471ea Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild