$ git clone -n https://src.fedoraproject.org/rpms/layer-shell-qt.git /var/lib/mock/f40-build-2159631-50941/root/chroot_tmpdir/scmroot/layer-shell-qt
Cloning into '/var/lib/mock/f40-build-2159631-50941/root/chroot_tmpdir/scmroot/layer-shell-qt'...
$ git fetch origin 1f9feea8f9f15f0089d684fa30c3a957b4013e44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/layer-shell-qt
 * [new ref]         1f9feea8f9f15f0089d684fa30c3a957b4013e44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f9feea 5.91.0