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services.nix-gc: improve error message when nix.gc.frequency is invalid on darwin

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Previously, if an invalid value was passed, the build would fail with:

       error: attribute '"00:02:03"' missing
       at /nix/store/sz92b5gqi0ma61d18fwbihi8p37mkvir-source/modules/services/nix-gc.nix:69:5:
           68|     in
           69|     freq.${frequency};
             |     ^
           70|

There was an assertion that should have prevented this from happening
but the crash would happen before the assertion gets a chance to stop
the build with a nice error message.

This commit both gives the assertion a chance to trigger and improves
the assertion's error message.
This commit is contained in:
Damien Cassou 2025-05-14 21:45:20 +02:00 • committed by Austin Horstman
parent ad1e8bb782
commit 3b930bb653
3 changed files with 17 additions and 4 deletions
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6
modules/services/nix-gc.nix
View file

@ -66,7 +66,7 @@ let
];
};
in
freq.${frequency};
freq.${frequency} or null;
nixPackage =
if config.nix.enable && config.nix.package != null then config.nix.package else pkgs.nix;
@ -95,7 +95,7 @@ in
On Linux this is a string as defined by {manpage}`systemd.time(7)`.
On Darwin it must be one of: ${toString darwinIntervals}, which are
On Darwin it must be one of: ${lib.concatStringsSep ", " darwinIntervals}, which are
implemented as defined in the manual page above.
'';
};
@ -172,7 +172,7 @@ in
assertions = [
{
assertion = lib.elem cfg.frequency darwinIntervals;
message = "On Darwin nix.gc.frequency must be one of: ${toString darwinIntervals}.";
message = "On Darwin nix.gc.frequency must be one of: ${lib.concatStringsSep ", " darwinIntervals}.";
}
];