$ git clone -n https://src.fedoraproject.org/rpms/layer-shell-qt.git /var/lib/mock/f40-build-788869-135452/root/chroot_tmpdir/scmroot/layer-shell-qt
Cloning into '/var/lib/mock/f40-build-788869-135452/root/chroot_tmpdir/scmroot/layer-shell-qt'...
$ git fetch origin b272bef5916f6fc2bb3668b358cdb18cdc782046:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/layer-shell-qt
 * [new ref]         b272bef5916f6fc2bb3668b358cdb18cdc782046 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b272bef 6.0.0