$ git clone -n https://src.fedoraproject.org/rpms/kf6-kdoctools.git /var/lib/mock/f40-build-2475478-61566/root/chroot_tmpdir/scmroot/kf6-kdoctools
Cloning into '/var/lib/mock/f40-build-2475478-61566/root/chroot_tmpdir/scmroot/kf6-kdoctools'...
$ git fetch origin 4449b5798afc7cdeb8ff751e7ca9a43f8ff65eb1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kdoctools
 * [new ref]         4449b5798afc7cdeb8ff751e7ca9a43f8ff65eb1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4449b57 6.0.0