$ git clone -n https://src.fedoraproject.org/rpms/clamtk.git /var/lib/mock/f40-build-2339577-59660/root/chroot_tmpdir/scmroot/clamtk
Cloning into '/var/lib/mock/f40-build-2339577-59660/root/chroot_tmpdir/scmroot/clamtk'...
$ git fetch origin 727724f28c0522ddb92ad355d2023e84f22db795:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/clamtk
 * [new ref]         727724f28c0522ddb92ad355d2023e84f22db795 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 727724f Update to 6.18