$ git clone -n https://src.fedoraproject.org/rpms/krdp.git /var/lib/mock/f42-build-side-1-3583029-46887/root/chroot_tmpdir/scmroot/krdp
Cloning into '/var/lib/mock/f42-build-side-1-3583029-46887/root/chroot_tmpdir/scmroot/krdp'...
$ git fetch origin 82e5069966ac0ea993c455af3fcd674a634b2a50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/krdp
 * [new ref]         82e5069966ac0ea993c455af3fcd674a634b2a50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82e5069 6.4.2