[Nix-dev] Literal “magic” strings in nixpkgs

[Profpatsch]

I noticed there is a trend to use magic strings in some places
of nixpkgs, e.g. in
https://nixos.org/nixos/manual/ch-options.html#opt-security.pki.certificateFiles
where the example is:

[ "${pkgs.cacert}/etc/ca-bundle.crt" ]

I find that alarming, because in exactly that case it silently broke when pkgs.cacert
moved its files to /etc/ssl/certs/ca-bundle.crt.

It got fixed in the meantime, but I’m pretty sure only after someone noticed it
suddenly stopped working.

There should be a variable exported by these packages that always points to the
correct file. And before inserting a magic string a variable should be created
and used in my opinion.

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