fix: stop the widgets from stalling or raising the draw

Memoize hwmon_dir by chip name so sensor reads no longer popen grep on
every frame, cache misses included. Floor fractional byte counts in
card.human so it cannot raise. Drop the GPU package-temperature row,
which duplicated the headline. Set umask before mkdir in both samplers
so a fresh cache directory is not world-readable. Make render.lua exit
non-zero on a draw error and tolerate an unset HOME.

1 files changed, 7 insertions, 2 deletions

diff --git a/test/render.lua b/test/render.lua
index 7d48d0e..3ed5f7e 100644
--- a/test/render.lua
+++ b/test/render.lua
@@ -29,7 +29,9 @@ local sw, sh = 2560, 1080
 -- The palette, read from the rendered conky.conf exactly as dashboard.lua
 -- does, so the PNG uses the real scheme rather than invented colours.
 local function config_colors()
-  local path = os.getenv('HOME') .. '/.config/conky/conky.conf'
+  local home = os.getenv('HOME')
+  if not home then return {} end
+  local path = home .. '/.config/conky/conky.conf'
   local f = io.open(path, 'r')
   if not f then return {} end
   local src = f:read('*a')
@@ -79,7 +81,10 @@ if not ok then
   os.exit(1)
 end
 local drew, err = pcall(mod.draw, cr, rect, colors)
-if not drew then print('DRAW ERROR: ' .. tostring(err)) end
+if not drew then
+  print('DRAW ERROR: ' .. tostring(err))
+  os.exit(1)
+end
 
 cairo_destroy(cr)
 cairo_surface_write_to_png(surf, out)