$ git clone -n https://src.fedoraproject.org/rpms/kscreen.git /var/lib/mock/f41-build-side-1-2647456-27302/root/chroot_tmpdir/scmroot/kscreen
Cloning into '/var/lib/mock/f41-build-side-1-2647456-27302/root/chroot_tmpdir/scmroot/kscreen'...
$ git fetch origin ad4966576261970b2f7477e10b757839f54f9e4a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreen
 * [new ref]         ad4966576261970b2f7477e10b757839f54f9e4a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad49665 6.1.4