[ufo]

Might work for config files but would it work for environment variables?

[bartq]

It would for env vars as well, why not? Just trace program trying to reach out for some var X from env.

[mvnuweucxqokii]

afaik reading env vars requires no sys calls and thus will not appear in strace

[bartq]

So there should be a different tool used which will intercept environment variables reads and will log them.