/usr/share/dune-grid/grids/dgf/helix.dgf is in libdune-grid-dev 2.5.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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INTERVAL
0 0
1 1
10 10
# INTERVAL
PROJECTION
function angle( x ) = 2 * pi * x[ 1 ]
function coordfunction( x ) = (x[ 0 ] + 0.2) * [ cos angle( x ), sin angle( x ), 0 ] + [ 0, 0, x[ 1 ] ]
# PROJECTION
GRIDPARAMETER
name Helix
refinementedge arbitrary
overlap 1
# GRIDPARAMETER
# DGF
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