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NixOS Module System

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8 Mar 2025
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9 Mar 2025
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12 Mar 2025
@lehmanator:tchncs.deSam LehmanIs there a "best-practices" way of iterating over many option names/values in a config? Particularly such that I can test the existence of many options without losing the benefits of lazy eval.12:09:50
@lehmanator:tchncs.deSam Lehman e.g. I'm trying to persist directories using impermanence by enumerating all services*.dataDir options, then appending its value to environment.persistence."/persist".directories with lib.optional config.services.<name>.enable config.services.<name>.dataDir 12:10:09
@nbp:mozilla.orgnbp Unfortunately no. So far people have been using map within modules to iterate over the individual definitions, and some have used mkMerge / mkIf to make their definitions conditional.
I have no found any way to generalize the processing of multiple option definitions into 1 or multiple at the moment.
If you have any idea of what might be a good API, feel free to suggest, and people in this channel might be able to provide an implementation (if possible)
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