$ git clone -n https://src.fedoraproject.org/rpms/qt6-qtserialbus.git /var/lib/mock/f40-build-786448-134291/root/chroot_tmpdir/scmroot/qt6-qtserialbus
Cloning into '/var/lib/mock/f40-build-786448-134291/root/chroot_tmpdir/scmroot/qt6-qtserialbus'...
$ git fetch origin 3ff2442091dd92ebd74c89174b393db8e4bdbfc3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt6-qtserialbus
 * [new ref]         3ff2442091dd92ebd74c89174b393db8e4bdbfc3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ff2442 6.6.2