$ git clone -n https://src.fedoraproject.org/rpms/layer-shell-qt.git /var/lib/mock/f40-build-772313-126390/root/chroot_tmpdir/scmroot/layer-shell-qt
Cloning into '/var/lib/mock/f40-build-772313-126390/root/chroot_tmpdir/scmroot/layer-shell-qt'...
$ git fetch origin 4d2dea10472a7830a5e9bbc5b4c4e25aa4ad704b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/layer-shell-qt
 * [new ref]         4d2dea10472a7830a5e9bbc5b4c4e25aa4ad704b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4d2dea1 Rebuild (qt5)