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lib/modules: Make unifyModuleSyntax key optional, remove extensionOffset #177157

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@roberth roberth commented Jun 10, 2022

Description of changes

Tried to make it work in #177080 but that still didn't solve all cases in practice (wip #176557). Found a simpler solution: don't number anonymous modules at all. Keys are assigned at a later stage anyway. We don't have to reinvent that solution in submoduleWith.
Numbering was introduced in 5002e6a as part of a solution for improving file locations in error messages. This goal is preserved.

Things done
  • Built on platform(s)
    • x86_64-linux
    • aarch64-linux
    • x86_64-darwin
    • aarch64-darwin
  • For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
  • Tested, as applicable:
  • Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
  • Tested basic functionality of all binary files (usually in ./result/bin/)
  • 22.11 Release Notes (or backporting 22.05 Release notes)
    • (Package updates) Added a release notes entry if the change is major or breaking
    • (Module updates) Added a release notes entry if the change is significant
    • (Module addition) Added a release notes entry if adding a new NixOS module
    • (Release notes changes) Ran nixos/doc/manual/md-to-db.sh to update generated release notes
  • Fits CONTRIBUTING.md.

@ofborg ofborg bot added the 2.status: merge conflict This PR has merge conflicts with the target branch label Jun 10, 2022
@roberth roberth force-pushed the lib-modules-remove-extensionOffset branch from c189d6b to 642ea23 Compare June 10, 2022 09:51
@ofborg ofborg bot added 10.rebuild-darwin: 0 This PR does not cause any packages to rebuild on Darwin 10.rebuild-linux: 1-10 and removed 2.status: merge conflict This PR has merge conflicts with the target branch labels Jun 10, 2022
@roberth roberth added the 6.topic: module system About "NixOS" module system internals label Jun 10, 2022
roberth added 3 commits June 13, 2022 22:11
Tried to make it work in NixOS#177080 but that still didn't solve all
cases in practice (wip NixOS#176557). Found a simpler solution:
don't number anonymous modules at all. Keys are assigned at a
later stage anyway. We don't have to reinvent that solution in
submoduleWith.
…eLocation

This should be equivalent and perhaps perform better.
…ultModuleLocation"

The performance did not improve, judging by the memory statistics.

Baseline: https://github.com/NixOS/nixpkgs/pull/177157/checks?check_run_id=6828895472

Without optionalAttrs: https://github.com/NixOS/nixpkgs/pull/177157/checks?check_run_id=6829274815

So the memory cost of the reverted commit was about 0.05%.

This reverts commit bb8461b4cb05bd468e34f2191cdea28dcd01e70a.
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6.topic: module system About "NixOS" module system internals 10.rebuild-darwin: 0 This PR does not cause any packages to rebuild on Darwin 10.rebuild-linux: 1-10
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