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36 lines
1.4 KiB
Markdown
36 lines
1.4 KiB
Markdown
# udevCheckHook {#udevcheckhook}
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The `udevCheckHook` derivation adds `udevCheckPhase` to the [`preInstallCheckHooks`](#ssec-installCheck-phase),
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which finds all udev rules in all outputs and verifies them using `udevadm verify --resolve-names=never --no-style`.
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It should be used in any package that has udev rules outputs to ensure the rules are and stay valid.
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The hook runs in `installCheckPhase`, requiring `doInstallCheck` is enabled for the hook to take effect:
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```nix
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{
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lib,
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stdenv,
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udevCheckHook,
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# ...
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}:
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stdenv.mkDerivation (finalAttrs: {
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# ...
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nativeInstallCheckInputs = [
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udevCheckHook
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];
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doInstallCheck = true;
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# ...
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})
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```
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Note that for [`buildPythonPackage`](#buildpythonpackage-function) and [`buildPythonApplication`](#buildpythonapplication-function), `doInstallCheck` is enabled by default.
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All outputs are scanned for their `/{etc,lib}/udev/rules.d` paths.
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If no rule output is found, the hook is basically a no-op.
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The `udevCheckHook` adds a dependency on `systemdMinimal`.
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It is internally guarded behind `hostPlatform` supporting udev and `buildPlatform` being able to execute `udevadm`.
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The hook does not need explicit platform checks in the places where it is used.
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The hook can be disabled using `dontUdevCheck`, which is necessary if you want to run some different task in `installCheckPhase` on a package with broken udev rule outputs.
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