Package scripts and environment vars

[Preuße, Hilmar <hille42@web.de>]

Moin,

dumb question, I did not find anything in the policy.

We got #1056587: in the postinst stage of a package a broken TeX format 
file is generated. The root cause is that the user placed a customized 
TeX input file anywhere and changed the TEXINPUTS variable in the 
environment of user root to make sure the file is read.

Question: is the postinst expected to do the right thing even in this 
situation, i.e. do we have to reset TEXINPUT or can we rely on a clean 
environment of user root, which contains only minimal customization?

Thanks,
  Hilmar
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