That is really the crux of the issue, since www-data does *not* have a 
login shell.  It is used only by apache.

Can setuptex be made to point to the home directory explicitly where the 
website is housed, e.g., '/home/wwwuser' with user 'wwwuser'?

On 17Jun16, luigi scarso wrote:
> Is  texmf-cache writable by www-data ?
> When logged as  www-data, the cache writable should  be the
> /home/www-data/luatex-cache/<..> folder, while the standard one is used as
> readonly folder
> 
> Just make a test: in www-data home
> # . /opt/context/tex/setuptex /opt/context/tex
> then make a simple "Hello world" test.tex and  read the log.
> 

-- 
Pavneet Arora           m: +1 (647) 406-6843
Waroc Informatik        t: +1 (416) 937-9276
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