$ git clone -n https://src.fedoraproject.org/rpms/libplasma.git /var/lib/mock/f40-build-800564-143605/root/chroot_tmpdir/scmroot/libplasma
Cloning into '/var/lib/mock/f40-build-800564-143605/root/chroot_tmpdir/scmroot/libplasma'...
$ git fetch origin cadac63f650c6c8de712bd0904ffea41b6806a32:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libplasma
 * [new ref]         cadac63f650c6c8de712bd0904ffea41b6806a32 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cadac63 6.0.3