$ git clone -n https://src.fedoraproject.org/rpms/kf6-sonnet.git /var/lib/mock/f42-build-3347403-45004/root/chroot_tmpdir/scmroot/kf6-sonnet
Cloning into '/var/lib/mock/f42-build-3347403-45004/root/chroot_tmpdir/scmroot/kf6-sonnet'...
$ git fetch origin cae4401d1e409ce409f70e27c9dfcb84efd9c18b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-sonnet
 * [new ref]         cae4401d1e409ce409f70e27c9dfcb84efd9c18b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cae4401 6.12.0