$ git clone -n https://src.fedoraproject.org/rpms/kf6-kdoctools.git /var/lib/mock/f42-build-862031-170551/root/chroot_tmpdir/scmroot/kf6-kdoctools
Cloning into '/var/lib/mock/f42-build-862031-170551/root/chroot_tmpdir/scmroot/kf6-kdoctools'...
$ git fetch origin 246bfbe5d082230c408d15438d86b9a168e1cfe2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kdoctools
 * [new ref]         246bfbe5d082230c408d15438d86b9a168e1cfe2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 246bfbe 6.8.0