$ git clone -n https://src.fedoraproject.org/rpms/qt6-qtgrpc.git /var/lib/mock/f42-build-3406865-45143/root/chroot_tmpdir/scmroot/qt6-qtgrpc
Cloning into '/var/lib/mock/f42-build-3406865-45143/root/chroot_tmpdir/scmroot/qt6-qtgrpc'...
$ git fetch origin 3c85146eed7f3a4c2b100dd2e3a59069bf65a5a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt6-qtgrpc
 * [new ref]         3c85146eed7f3a4c2b100dd2e3a59069bf65a5a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c85146 6.8.2