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nixos/localtimed: set time.timeZone to null to avoid silent overriding #347221

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Currently if a timezone was selected explicitly, the service will silently override the value, essentially ignoring what is meant to be a a deliberate choice of option. This may cause confusion as to why the option is not doing anything when this service is enabled, particularly in more complex set-ups after some time.

This will simply make the choice deliberate from the user's part, either by having to remove the option or lowering its priority as a recognition that it may be ignored.

This change was inspired by the services.tzupdate module, which does the same.

Things done

  • Built on platform(s)
    • x86_64-linux
    • aarch64-linux
    • x86_64-darwin
    • aarch64-darwin
  • For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
    • sandbox = relaxed
    • sandbox = true
  • 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/)
  • 24.11 Release Notes (or backporting 23.11 and 24.05 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
  • Fits CONTRIBUTING.md.

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Currently if a timezone was selected explicitly, the service will
silently override the value, essentially ignoring what is meant to be a
a deliberate choice of option. This may cause confusion as to why the
option is not doing anything when this service is enabled, particularly
in more complex set-ups after some time.

This will simply make the choice deliberate from the user's part, either
by having to remove the option or lowering its priority as a recognition
that it may be ignored.

This change was inspired by the `services.tzupdate` module, which does
the same.

[1]: <https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/misc/tzupdate.nix#L24>
@guanarrana guanarrana changed the title nixos/localtimed: set time.timeZone to null to avoid silent overriding nixos/localtimed: set time.timeZone to null to avoid silent overriding Oct 8, 2024
@guanarrana guanarrana changed the title nixos/localtimed: set time.timeZone to null to avoid silent overriding nixos/localtimed: set time.timeZone to null to avoid silent overriding Oct 8, 2024
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