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|
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|
||
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|
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|
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|
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<a href="../../../Lix/" class="md-nav__link">
|
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|
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|
||
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|
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Lix
|
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</span>
|
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|
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|
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|
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|
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<span class="md-ellipsis">
|
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</span>
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<span class="md-nav__icon md-icon"></span>
|
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|
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<li class="md-nav__item md-nav__item--active md-nav__item--section md-nav__item--nested">
|
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|
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|
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|
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_6" checked>
|
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|
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|
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|
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<div class="md-nav__link md-nav__container">
|
||
<a href="../../" class="md-nav__link ">
|
||
|
||
|
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<span class="md-ellipsis">
|
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Nixpkgs
|
||
</span>
|
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|
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|
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</a>
|
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|
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|
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<label class="md-nav__link " for="__nav_6" id="__nav_6_label" tabindex="">
|
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<span class="md-nav__icon md-icon"></span>
|
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</label>
|
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|
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</div>
|
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|
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_6_label" aria-expanded="true">
|
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<label class="md-nav__title" for="__nav_6">
|
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<span class="md-nav__icon md-icon"></span>
|
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Nixpkgs
|
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</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
|
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|
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|
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|
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|
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|
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<li class="md-nav__item">
|
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<a href="../../options/" class="md-nav__link">
|
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|
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|
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<span class="md-ellipsis">
|
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Options
|
||
</span>
|
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|
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|
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</a>
|
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|
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|
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<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
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|
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|
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|
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<a href="../../Build-Helpers/" class="md-nav__link">
|
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|
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|
||
<span class="md-ellipsis">
|
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Build Helpers
|
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</span>
|
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|
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|
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|
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<span class="md-nav__icon md-icon"></span>
|
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|
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</a>
|
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|
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|
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|
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|
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<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
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|
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|
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<a href="../../Development/" class="md-nav__link">
|
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|
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|
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<span class="md-ellipsis">
|
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Development
|
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</span>
|
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|
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|
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|
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<span class="md-nav__icon md-icon"></span>
|
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|
||
</a>
|
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|
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|
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|
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|
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|
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<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
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|
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|
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|
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|
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<a href="../../Functions/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Functions
|
||
</span>
|
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|
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|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
||
|
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|
||
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|
||
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|
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|
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|
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|
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|
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|
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|
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<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
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|
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|
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|
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|
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<a href="../../Hooks/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Hooks
|
||
</span>
|
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|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
||
|
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|
||
</li>
|
||
|
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|
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|
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|
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|
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|
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<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
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|
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<a href="../../Languages-And-Frameworks/" class="md-nav__link">
|
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|
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|
||
<span class="md-ellipsis">
|
||
Languages And Frameworks
|
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</span>
|
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|
||
|
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|
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<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
||
|
||
|
||
|
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|
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|
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|
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|
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|
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|
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|
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<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
||
|
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|
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|
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|
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<a href="../../Library-Reference/asserts/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Library Reference
|
||
</span>
|
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|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
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|
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|
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|
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|
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<a href="../../Module-System/module-system.chapter/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Module System
|
||
</span>
|
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|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
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|
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|
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</li>
|
||
|
||
|
||
|
||
|
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|
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|
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|
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|
||
|
||
|
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|
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|
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|
||
|
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|
||
|
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|
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|
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|
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|
||
|
||
|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
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|
||
<li class="md-nav__item md-nav__item--active md-nav__item--nested">
|
||
|
||
|
||
|
||
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_6_10" checked>
|
||
|
||
|
||
|
||
<div class="md-nav__link md-nav__container">
|
||
<a href="../" class="md-nav__link ">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Packages
|
||
</span>
|
||
|
||
|
||
</a>
|
||
|
||
|
||
<label class="md-nav__link " for="__nav_6_10" id="__nav_6_10_label" tabindex="0">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
</div>
|
||
|
||
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_6_10_label" aria-expanded="true">
|
||
<label class="md-nav__title" for="__nav_6_10">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Packages
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
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|
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|
||
|
||
|
||
|
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|
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|
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|
||
<li class="md-nav__item">
|
||
<a href="../cataclysm-dda.section/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Cataclysm: Dark Days Ahead
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../citrix.section/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Citrix Workspace
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../darwin-builder.section/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
darwin.linux-builder
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../dlib.section/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
DLib
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../eclipse.section/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
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Eclipse
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<h1 id="sec-linux-kernel">Linux kernel</h1>
|
||
<p>The Nix expressions to build the Linux kernel are in <a href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/os-specific/linux/kernel"><code>pkgs/os-specific/linux/kernel</code></a>.</p>
|
||
<p>The function <a href="https://github.com/NixOS/nixpkgs/blob/d77bda728d5041c1294a68fb25c79e2d161f62b9/pkgs/os-specific/linux/kernel/generic.nix"><code>pkgs.buildLinux</code></a> builds a kernel with <a href="https://github.com/NixOS/nixpkgs/blob/d77bda728d5041c1294a68fb25c79e2d161f62b9/pkgs/os-specific/linux/kernel/common-config.nix">common configuration values</a>.
|
||
This is the preferred option unless you have a very specific use case.
|
||
Most kernels packaged in Nixpkgs are built that way, and it will also generate kernels suitable for NixOS.
|
||
<a href="https://github.com/NixOS/nixpkgs/blob/d77bda728d5041c1294a68fb25c79e2d161f62b9/pkgs/os-specific/linux/kernel/manual-config.nix"><code>pkgs.linuxManualConfig</code></a> requires a complete configuration to be passed.
|
||
It has fewer additional features than <code>pkgs.buildLinux</code>, which provides common configuration values and exposes the <code>features</code> attribute, as explained below.</p>
|
||
<p>Both functions have an argument <code>kernelPatches</code> which should be a list of <code>{name, patch, extraConfig}</code> attribute sets, where <code>name</code> is the name of the patch (which is included in the kernel’s <code>meta.description</code> attribute), <code>patch</code> is the patch itself (possibly compressed), and <code>extraConfig</code> (optional) is a string specifying extra options to be concatenated to the kernel configuration file (<code>.config</code>).</p>
|
||
<p>The kernel derivation created with <code>pkgs.buildLinux</code> exports an attribute <code>features</code> specifying whether optional functionality is or isn’t enabled. This is used in NixOS to implement kernel-specific behaviour.</p>
|
||
<p>If you are using a kernel packaged in Nixpkgs, you can customize it by overriding its arguments. For details on how each argument affects the generated kernel, refer to <a href="https://github.com/NixOS/nixpkgs/blob/d77bda728d5041c1294a68fb25c79e2d161f62b9/pkgs/os-specific/linux/kernel/generic.nix">the <code>pkgs.buildLinux</code> source code</a>.</p>
|
||
<div class="admonition example">
|
||
<p class="admonition-title">Overriding the kernel derivation</p>
|
||
<p>Assuming you are using the kernel from <code>pkgs.linux_latest</code>:</p>
|
||
<div class="highlight"><pre><span></span><code>pkgs<span class="o">.</span>linux_latest<span class="o">.</span>override <span class="p">{</span>
|
||
<span class="ss">ignoreConfigErrors</span> <span class="o">=</span> <span class="no">true</span><span class="p">;</span>
|
||
<span class="ss">autoModules</span> <span class="o">=</span> <span class="no">false</span><span class="p">;</span>
|
||
<span class="ss">kernelPreferBuiltin</span> <span class="o">=</span> <span class="no">true</span><span class="p">;</span>
|
||
<span class="ss">extraStructuredConfig</span> <span class="o">=</span> <span class="k">with</span> lib<span class="o">.</span>kernel<span class="p">;</span> <span class="p">{</span>
|
||
<span class="ss">DEBUG_KERNEL</span> <span class="o">=</span> yes<span class="p">;</span>
|
||
<span class="ss">FRAME_POINTER</span> <span class="o">=</span> yes<span class="p">;</span>
|
||
<span class="ss">KGDB</span> <span class="o">=</span> yes<span class="p">;</span>
|
||
<span class="ss">KGDB_SERIAL_CONSOLE</span> <span class="o">=</span> yes<span class="p">;</span>
|
||
<span class="ss">DEBUG_INFO</span> <span class="o">=</span> yes<span class="p">;</span>
|
||
<span class="p">};</span>
|
||
<span class="p">}</span>
|
||
</code></pre></div>
|
||
</div>
|
||
<h2 id="sec-manual-kernel-configuration">Manual kernel configuration</h2>
|
||
<p>Sometimes it may not be desirable to use kernels built with <code>pkgs.buildLinux</code>, especially if most of the common configuration has to be altered or disabled to achieve a kernel as expected by the target use case.
|
||
An example of this is building a kernel for use in a VM or micro VM. You can use <code>pkgs.linuxPackages_custom</code> in these cases. It requires the <code>src</code>, <code>version</code>, and <code>configfile</code> attributes to be specified.</p>
|
||
<div class="admonition example">
|
||
<p class="admonition-title">Using <code>pkgs.linuxPackages_custom</code> with a specific source, version, and config file</p>
|
||
<div class="highlight"><pre><span></span><code><span class="p">{</span> pkgs<span class="p">,</span> <span class="o">...</span> <span class="p">}:</span>
|
||
pkgs<span class="o">.</span>linuxPackages_custom <span class="p">{</span>
|
||
<span class="ss">version</span> <span class="o">=</span> <span class="s2">"6.1.55"</span><span class="p">;</span>
|
||
<span class="ss">src</span> <span class="o">=</span> pkgs<span class="o">.</span>fetchurl <span class="p">{</span>
|
||
<span class="ss">url</span> <span class="o">=</span> <span class="s2">"https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-</span><span class="si">${</span>version<span class="si">}</span><span class="s2">.tar.xz"</span><span class="p">;</span>
|
||
<span class="ss">hash</span> <span class="o">=</span> <span class="s2">"sha256:1h0mzx52q9pvdv7rhnvb8g68i7bnlc9rf8gy9qn4alsxq4g28zm8"</span><span class="p">;</span>
|
||
<span class="p">};</span>
|
||
<span class="ss">configfile</span> <span class="o">=</span> <span class="l">./path_to_config_file</span><span class="p">;</span>
|
||
<span class="p">}</span>
|
||
</code></pre></div>
|
||
<p>If necessary, the version string can be slightly modified to explicitly mark it as a custom version. If you do so, ensure the <code>modDirVersion</code> attribute matches the source's version, otherwise the build will fail.</p>
|
||
<div class="highlight"><pre><span></span><code><span class="p">{</span> pkgs<span class="p">,</span> <span class="o">...</span> <span class="p">}:</span>
|
||
pkgs<span class="o">.</span>linuxPackages_custom <span class="p">{</span>
|
||
<span class="ss">version</span> <span class="o">=</span> <span class="s2">"6.1.55-custom"</span><span class="p">;</span>
|
||
<span class="ss">modDirVersion</span> <span class="o">=</span> <span class="s2">"6.1.55"</span><span class="p">;</span>
|
||
<span class="ss">src</span> <span class="o">=</span> pkgs<span class="o">.</span>fetchurl <span class="p">{</span>
|
||
<span class="ss">url</span> <span class="o">=</span> <span class="s2">"https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-</span><span class="si">${</span>modDirVersion<span class="si">}</span><span class="s2">.tar.xz"</span><span class="p">;</span>
|
||
<span class="ss">hash</span> <span class="o">=</span> <span class="s2">"sha256:1h0mzx52q9pvdv7rhnvb8g68i7bnlc9rf8gy9qn4alsxq4g28zm8"</span><span class="p">;</span>
|
||
<span class="p">};</span>
|
||
<span class="ss">configfile</span> <span class="o">=</span> <span class="l">./path_to_config_file</span><span class="p">;</span>
|
||
<span class="p">}</span>
|
||
</code></pre></div>
|
||
</div>
|
||
<p>Additional attributes can be used with <code>linuxManualConfig</code> for further customisation instead of <code>linuxPackages_custom</code>. You're encouraged to read <a href="https://github.com/NixOS/nixpkgs/blob/d77bda728d5041c1294a68fb25c79e2d161f62b9/pkgs/os-specific/linux/kernel/manual-config.nix">the <code>pkgs.linuxManualConfig</code> source code</a> to understand how to use them.</p>
|
||
<p>To edit the <code>.config</code> file for Linux X.Y from within Nix, proceed as follows:</p>
|
||
<div class="highlight"><pre><span></span><code>$ nix-shell '<nixpkgs>' -A linuxKernel.kernels.linux_X_Y.configEnv
|
||
$ unpackPhase
|
||
$ cd linux-*
|
||
$ make nconfig
|
||
</code></pre></div>
|
||
<h2 id="sec-linux-kernel-developing-modules">Developing kernel modules</h2>
|
||
<p>When developing kernel modules it's often convenient to run the edit-compile-run loop as quickly as possible.
|
||
See the snippet below as an example.</p>
|
||
<div class="admonition example">
|
||
<p class="admonition-title">Edit-compile-run loop when developing <code>mellanox</code> drivers</p>
|
||
<div class="highlight"><pre><span></span><code>$ nix-build '<nixpkgs>' -A linuxPackages.kernel.dev
|
||
$ nix-shell '<nixpkgs>' -A linuxPackages.kernel
|
||
$ unpackPhase
|
||
$ cd linux-*
|
||
$ make -C $dev/lib/modules/*/build M=$(pwd)/drivers/net/ethernet/mellanox modules
|
||
# insmod ./drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko
|
||
</code></pre></div>
|
||
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|
||
|
||
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