$ git clone -n https://src.fedoraproject.org/rpms/gvisor-tap-vsock.git /var/lib/mock/f41-build-side-1-2641687-26732/root/chroot_tmpdir/scmroot/gvisor-tap-vsock
Cloning into '/var/lib/mock/f41-build-side-1-2641687-26732/root/chroot_tmpdir/scmroot/gvisor-tap-vsock'...
$ git fetch origin 4460081b20ff9d80f1d27604e5ac96e28e8c8cc0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gvisor-tap-vsock
 * [new ref]         4460081b20ff9d80f1d27604e5ac96e28e8c8cc0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4460081 Update to 0.7.5 upstream release