texlive: Refactors toward working texdoc

[bb010g]

The main thing to notice is that texlive is now a package scope. Inside it, texlivePackages contains what was previously lexically-scoped local tl, and the previous interface is provided for compatibility. Evaluations are not slower from the minor testing I did, and may be slightly faster. Please review commit-by-commit.

lib.makeScope' now appears, with the interface of lib.makeScopeWithSplicing but the (non-deprecated) functionality of lib.makeScope, so that the texlive scope may be forwards-compatible with lib.makeScopeWithSplicing.

buildenv now passes through preferLocalBuild and allowSubstitutes so that buildTexliveCombinedEnv doesn't invoke .overrideAttrs to achieve that effect.

I'm not sure about names, so feedback is really appreciated there. I tried to keep callPackage in the child scope unambiguous.

Motivation for this change

While investigating solutions for #118757, working with TeX Live in Nixpkgs was a pain. It's now less of a pain, but still needs work in my opinion to have nice separation between TeX Live, CTAN, and the combination machinery. Something simple like overriding texliveBin works without gymnastics, and changes to helper functions can be experimented with without copying & pasting whole files, closer to the flexibility Nixpkgs provides for Python.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
  (No diff detected, stopping review...)
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

---

This change is 

[bb010g]

nix-build -A tests.texlive -A tests.texlive.dvipng runs without error.

[bb010g]

ofborg-eval results in:

nix-env did not evaluate cleanly:
 ["trace: warning: Obsolete attribute `bin\' is used. It was renamed to `texliveBin\'."]

I can't find any package that using bin, so I presume this is from evaluating all of texlive's attributes? I'm not sure what a proper fix for this is. Should lib.warn not be used on bin? (The warning was based on lib.modules.mkRenamedOptionModule.)

[nixos-discourse]

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/texdoc-cannot-find-texlive-tlpdb/9303/2

[tobiasBora]

If I understand correctly, texdoc is not yet working even with this PR?

[stale]

I marked this as stale due to inactivity. → More info