commit 72f2c8d6c681590d8c973bb79bdd21060aec9c53 · pyrox.dev/nixpkgs

+22

lib/tests/modules.sh

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       checkConfigOutput '^true$' config.result ./test-mergeAttrDefinitionsWithPrio.nix

     

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       # Check that a module argument is passed, also when a default is available

     

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       # (but not needed)

     

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       #

     

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       # When the default is needed, we currently fail to do what the users expect, as

     

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       # we pass our own argument anyway, even if it *turns out* not to exist.

     

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       #

     

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       # The reason for this is that we don't know at invocation time what is in the

     

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       # _module.args option. That value is only available *after* all modules have been

     

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       # invoked.

     

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       #

     

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       # Hypothetically, Nix could help support this by giving access to the default

     

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       # values, through a new built-in function.

     

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       # However the default values are allowed to depend on other arguments, so those

     

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       # would have to be passed in somehow, making this not just a getter but

     

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       # something more complicated.

     

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       #

     

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       # At that point we have to wonder whether the extra complexity is worth the cost.

     

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       # Another - subjective - reason not to support it is that default values

     

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       # contradict the notion that an option has a single value, where _module.args

     

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       # is the option.

     

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       checkConfigOutput '^true$' config.result ./module-argument-default.nix

     

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       # types.pathInStore

     

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       checkConfigOutput '".*/store/0lz9p8xhf89kb1c1kk6jxrzskaiygnlh-bash-5.2-p15.drv"' config.pathInStore.ok1 ./types.nix

     

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       checkConfigOutput '".*/store/0fb3ykw9r5hpayd05sr0cizwadzq1d8q-bash-5.2-p15"' config.pathInStore.ok2 ./types.nix

lib/tests/modules/module-argument-default.nix

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       { a ? false, lib, ... }: {

     

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         options = {

     

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           result = lib.mkOption {};

     

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         };

     

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         config = {

     

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           _module.args.a = true;

     

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           result = a;

     

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         };

     

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       }