$ git clone -n https://src.fedoraproject.org/rpms/qt6-qtserialbus.git /var/lib/mock/f40-build-740258-109608/root/chroot_tmpdir/scmroot/qt6-qtserialbus
Cloning into '/var/lib/mock/f40-build-740258-109608/root/chroot_tmpdir/scmroot/qt6-qtserialbus'...
$ git fetch origin 3ccb0b306747b84c58c9648984529b05e4abf7ca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt6-qtserialbus
 * [new ref]         3ccb0b306747b84c58c9648984529b05e4abf7ca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ccb0b3 6.6.0