texlive: make updmap actually regenerate (#76826)

[mikesperber]

The --syncwithtrees flag made updmap not regenerate the map files,
effectively leaving stale map files in place.

Motivation for this change

Closes: #76826

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"
• 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.

Notify maintainers

cc @veprbl

[veprbl]

Does "updmap --sys" include the operation of "updmap --sys −−syncwithtrees"? If not, this may break schemes smaller than scheme-full.

[mikesperber]

I'm not sure what that operation is: The effect I observed is that is causes no map file to be written, leaving the one from the distribution in place.

From the documentation, it seems that the effect should be that it removes entries in pdftex.map in place where the corresponding map file can't be found. But AFAICS, it doesn't remove (or add or change) anything, so the issue is moot: Either I'm misunderstanding what the flag is supposed to do, or there's a bug with updmap.

In any case, I don't see any harm leaving entries in the map file for fonts that are not in the package - after all, you can't create references to these entries if the corresponding package isn't there.

PS: Thanks for looking into this!

[veprbl]

@GrahamcOfBorg build texlive.combined.scheme-small

[veprbl]

@mikesperber It breaks texlive.combined.scheme-small.

[mikesperber]

@veprbl Ah, I see now: --syncwithtrees only updates the config files, prevents the map files from being generated. Just updated the pull request and checked that texlive.combined.scheme-small. (Sorry about the intermediate breakage.)

[veprbl]

@GrahamcOfBorg build texlive.combined.scheme-small
@GrahamcOfBorg build texlive.combined.scheme-full

[veprbl]

I guess, the original issue was caused by an inconsistency in the snapshot that we are using.

[mikesperber]

Many thanks!