$ git clone -n https://src.fedoraproject.org/rpms/vokoscreenNG.git /var/lib/mock/f40-build-804623-144570/root/chroot_tmpdir/scmroot/vokoscreenNG
Cloning into '/var/lib/mock/f40-build-804623-144570/root/chroot_tmpdir/scmroot/vokoscreenNG'...
$ git fetch origin 1a4b895a9bb6fb15b007dee4489a2920820985f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vokoscreenNG
 * [new ref]         1a4b895a9bb6fb15b007dee4489a2920820985f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a4b895 build: Update to 4.1.0 (rh#2271769)