$ git clone -n https://src.fedoraproject.org/rpms/virtiofsd.git /var/lib/mock/f39-build-1512503-35565/root/chroot_tmpdir/scmroot/virtiofsd
Cloning into '/var/lib/mock/f39-build-1512503-35565/root/chroot_tmpdir/scmroot/virtiofsd'...
$ git fetch origin 6594b083b8bdbae24819c531eab18a27a56a31e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/virtiofsd
 * [new ref]         6594b083b8bdbae24819c531eab18a27a56a31e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6594b08 Rebuild with latest vhost-user-backend; xref