$ git clone -n https://src.fedoraproject.org/rpms/kmime.git /var/lib/mock/f45-build-15289-472/root/chroot_tmpdir/scmroot/kmime
Cloning into '/var/lib/mock/f45-build-15289-472/root/chroot_tmpdir/scmroot/kmime'...
$ git fetch origin c0740067dcb45bb0a09571f43b3ffa40a9422ba4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kmime
 * [new ref]         c0740067dcb45bb0a09571f43b3ffa40a9422ba4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c074006 Hacked kmime so it's co-installable with kf6-kmime