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<h1 id="sec-functions-library-customisation">lib.customisation: Functions to customise (derivation-related) functions, derivatons, or attribute sets</h1>
<h2 id="function-library-lib.customisation.overrideDerivation"><code>lib.customisation.overrideDerivation</code></h2>
<p><code>overrideDerivation drv f</code> takes a derivation (i.e., the result
of a call to the builtin function <code>derivation</code>) and returns a new
derivation in which the attributes of the original are overridden
according to the function <code>f</code>. The function <code>f</code> is called with
the original derivation attributes.</p>
<p><code>overrideDerivation</code> allows certain "ad-hoc" customisation
scenarios (e.g. in ~/.config/nixpkgs/config.nix). For instance,
if you want to "patch" the derivation returned by a package
function in Nixpkgs to build another version than what the
function itself provides.</p>
<p>For another application, see build-support/vm, where this
function is used to build arbitrary derivations inside a QEMU
virtual machine.</p>
<p>Note that in order to preserve evaluation errors, the new derivation's
outPath depends on the old one's, which means that this function cannot
be used in circular situations when the old derivation also depends on the
new one.</p>
<p>You should in general prefer <code>drv.overrideAttrs</code> over this function;
see the nixpkgs manual for more information on overriding.</p>
<h3 id="inputs">Inputs</h3>
<p><code>drv</code></p>
<p>: 1. Function argument</p>
<p><code>f</code></p>
<p>: 2. Function argument</p>
<h3 id="type">Type</h3>
<div class="highlight"><pre><span></span><code>overrideDerivation :: Derivation -&gt; ( Derivation -&gt; AttrSet ) -&gt; Derivation
</code></pre></div>
<h3 id="examples">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.customisation.overrideDerivation</code> usage example</p>
<div class="highlight"><pre><span></span><code><span class="ss">mySed</span> <span class="o">=</span> overrideDerivation pkgs<span class="o">.</span>gnused <span class="p">(</span>oldAttrs<span class="p">:</span> <span class="p">{</span>
<span class="ss">name</span> <span class="o">=</span> <span class="s2">&quot;sed-4.2.2-pre&quot;</span><span class="p">;</span>
<span class="ss">src</span> <span class="o">=</span> fetchurl <span class="p">{</span>
<span class="ss">url</span> <span class="o">=</span> <span class="l">ftp://alpha.gnu.org/gnu/sed/sed-4.2.2-pre.tar.bz2</span><span class="p">;</span>
<span class="ss">hash</span> <span class="o">=</span> <span class="s2">&quot;sha256-MxBJRcM2rYzQYwJ5XKxhXTQByvSg5jZc5cSHEZoB2IY=&quot;</span><span class="p">;</span>
<span class="p">};</span>
<span class="ss">patches</span> <span class="o">=</span> <span class="p">[];</span>
<span class="p">});</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/customisation.nix#L77">lib/customisation.nix:77</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.customisation.makeOverridable"><code>lib.customisation.makeOverridable</code></h2>
<p><code>makeOverridable</code> takes a function from attribute set to attribute set and
injects <code>override</code> attribute which can be used to override arguments of
the function.</p>
<p>Please refer to documentation on <a href="#sec-pkg-overrideDerivation"><code>&lt;pkg&gt;.overrideDerivation</code></a> to learn about <code>overrideDerivation</code> and caveats
related to its use.</p>
<h3 id="inputs_1">Inputs</h3>
<p><code>f</code></p>
<p>: 1. Function argument</p>
<h3 id="type_1">Type</h3>
<div class="highlight"><pre><span></span><code>makeOverridable :: (AttrSet -&gt; a) -&gt; AttrSet -&gt; a
</code></pre></div>
<h3 id="examples_1">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.customisation.makeOverridable</code> usage example</p>
<div class="highlight"><pre><span></span><code>nix-repl<span class="o">&gt;</span> <span class="ss">x</span> <span class="o">=</span> <span class="p">{</span>a<span class="p">,</span> b<span class="p">}:</span> <span class="p">{</span> <span class="ss">result</span> <span class="o">=</span> a <span class="o">+</span> b<span class="p">;</span> <span class="p">}</span>
nix-repl<span class="o">&gt;</span> <span class="ss">y</span> <span class="o">=</span> lib<span class="o">.</span>makeOverridable x <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="p">}</span>
nix-repl<span class="o">&gt;</span> y
<span class="p">{</span> <span class="ss">override</span> <span class="o">=</span> <span class="err">«</span>lambda<span class="err">»</span><span class="p">;</span> <span class="ss">overrideDerivation</span> <span class="o">=</span> <span class="err">«</span>lambda<span class="err">»</span><span class="p">;</span> <span class="ss">result</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> <span class="p">}</span>
nix-repl<span class="o">&gt;</span> y<span class="o">.</span>override <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">10</span><span class="p">;</span> <span class="p">}</span>
<span class="p">{</span> <span class="ss">override</span> <span class="o">=</span> <span class="err">«</span>lambda<span class="err">»</span><span class="p">;</span> <span class="ss">overrideDerivation</span> <span class="o">=</span> <span class="err">«</span>lambda<span class="err">»</span><span class="p">;</span> <span class="ss">result</span> <span class="o">=</span> <span class="mi">12</span><span class="p">;</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/customisation.nix#L131">lib/customisation.nix:131</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.customisation.callPackageWith"><code>lib.customisation.callPackageWith</code></h2>
<p>Call the package function in the file <code>fn</code> with the required
arguments automatically. The function is called with the
arguments <code>args</code>, but any missing arguments are obtained from
<code>autoArgs</code>. This function is intended to be partially
parameterised, e.g.,</p>
<div class="highlight"><pre><span></span><code><span class="ss">callPackage</span> <span class="o">=</span> callPackageWith pkgs<span class="p">;</span>
<span class="ss">pkgs</span> <span class="o">=</span> <span class="p">{</span>
<span class="ss">libfoo</span> <span class="o">=</span> callPackage <span class="l">./foo.nix</span> <span class="p">{</span> <span class="p">};</span>
<span class="ss">libbar</span> <span class="o">=</span> callPackage <span class="l">./bar.nix</span> <span class="p">{</span> <span class="p">};</span>
<span class="p">};</span>
</code></pre></div>
<p>If the <code>libbar</code> function expects an argument named <code>libfoo</code>, it is
automatically passed as an argument. Overrides or missing
arguments can be supplied in <code>args</code>, e.g.</p>
<div class="highlight"><pre><span></span><code><span class="ss">libbar</span> <span class="o">=</span> callPackage <span class="l">./bar.nix</span> <span class="p">{</span>
<span class="ss">libfoo</span> <span class="o">=</span> <span class="no">null</span><span class="p">;</span>
<span class="ss">enableX11</span> <span class="o">=</span> <span class="no">true</span><span class="p">;</span>
<span class="p">};</span>
</code></pre></div>
<!-- TODO: Apply "Example:" tag to the examples above -->
<h3 id="inputs_2">Inputs</h3>
<p><code>autoArgs</code></p>
<p>: 1. Function argument</p>
<p><code>fn</code></p>
<p>: 2. Function argument</p>
<p><code>args</code></p>
<p>: 3. Function argument</p>
<h3 id="type_2">Type</h3>
<div class="highlight"><pre><span></span><code>callPackageWith :: AttrSet -&gt; ((AttrSet -&gt; a) | Path) -&gt; AttrSet -&gt; a
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/customisation.nix#L212">lib/customisation.nix:212</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.customisation.callPackagesWith"><code>lib.customisation.callPackagesWith</code></h2>
<p>Like callPackage, but for a function that returns an attribute
set of derivations. The override function is added to the
individual attributes.</p>
<h3 id="inputs_3">Inputs</h3>
<p><code>autoArgs</code></p>
<p>: 1. Function argument</p>
<p><code>fn</code></p>
<p>: 2. Function argument</p>
<p><code>args</code></p>
<p>: 3. Function argument</p>
<h3 id="type_3">Type</h3>
<div class="highlight"><pre><span></span><code>callPackagesWith :: AttrSet -&gt; ((AttrSet -&gt; AttrSet) | Path) -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/customisation.nix#L298">lib/customisation.nix:298</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.customisation.extendDerivation"><code>lib.customisation.extendDerivation</code></h2>
<p>Add attributes to each output of a derivation without changing
the derivation itself and check a given condition when evaluating.</p>
<h3 id="inputs_4">Inputs</h3>
<p><code>condition</code></p>
<p>: 1. Function argument</p>
<p><code>passthru</code></p>
<p>: 2. Function argument</p>
<p><code>drv</code></p>
<p>: 3. Function argument</p>
<h3 id="type_4">Type</h3>
<div class="highlight"><pre><span></span><code>extendDerivation :: Bool -&gt; Any -&gt; Derivation -&gt; Derivation
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/customisation.nix#L339">lib/customisation.nix:339</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.customisation.hydraJob"><code>lib.customisation.hydraJob</code></h2>
<p>Strip a derivation of all non-essential attributes, returning
only those needed by hydra-eval-jobs. Also strictly evaluate the
result to ensure that there are no thunks kept alive to prevent
garbage collection.</p>
<h3 id="inputs_5">Inputs</h3>
<p><code>drv</code></p>
<p>: 1. Function argument</p>
<h3 id="type_5">Type</h3>
<div class="highlight"><pre><span></span><code>hydraJob :: (Derivation | Null) -&gt; (Derivation | Null)
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/customisation.nix#L388">lib/customisation.nix:388</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.customisation.makeScope"><code>lib.customisation.makeScope</code></h2>
<p>Make an attribute set (a "scope") from functions that take arguments from that same attribute set.
See <a href="#ex-makeScope"></a> for how to use it.</p>
<h3 id="inputs_6">Inputs</h3>
<ol>
<li><code>newScope</code> (<code>AttrSet -&gt; ((AttrSet -&gt; a) | Path) -&gt; AttrSet -&gt; a</code>)</li>
</ol>
<p>A function that takes an attribute set <code>attrs</code> and returns what ends up as <code>callPackage</code> in the output.</p>
<p>Typical values are <code>callPackageWith</code> or the output attribute <code>newScope</code>.</p>
<ol>
<li><code>f</code> (<code>AttrSet -&gt; AttrSet</code>)</li>
</ol>
<p>A function that takes an attribute set as returned by <code>makeScope newScope f</code> (a "scope") and returns any attribute set.</p>
<p>This function is used to compute the fixpoint of the resulting scope using <code>callPackage</code>.
Its argument is the lazily evaluated reference to the value of that fixpoint, and is typically called <code>self</code> or <code>final</code>.</p>
<p>See <a href="#ex-makeScope"></a> for how to use it.
See <a href="#sec-functions-library-fixedPoints"></a> for details on fixpoint computation.</p>
<h3 id="output">Output</h3>
<p><code>makeScope</code> returns an attribute set of a form called <code>scope</code>, which also contains the final attributes produced by <code>f</code>:</p>
<div class="highlight"><pre><span></span><code>scope :: {
callPackage :: ((AttrSet -&gt; a) | Path) -&gt; AttrSet -&gt; a
newScope = AttrSet -&gt; scope
overrideScope = (scope -&gt; scope -&gt; AttrSet) -&gt; scope
packages :: AttrSet -&gt; AttrSet
}
</code></pre></div>
<ul>
<li><code>callPackage</code> (<code>((AttrSet -&gt; a) | Path) -&gt; AttrSet -&gt; a</code>)</li>
</ul>
<p>A function that</p>
<ol>
<li>Takes a function <code>p</code>, or a path to a Nix file that contains a function <code>p</code>, which takes an attribute set and returns value of arbitrary type <code>a</code>,</li>
<li>Takes an attribute set <code>args</code> with explicit attributes to pass to <code>p</code>,</li>
<li>Calls <code>f</code> with attributes from the original attribute set <code>attrs</code> passed to <code>newScope</code> updated with <code>args, i.e.</code>attrs // args<code>, if they match the attributes in the argument of</code>p`.</li>
</ol>
<p>All such functions <code>p</code> will be called with the same value for <code>attrs</code>.</p>
<p>See <a href="#ex-makeScope-callPackage"></a> for how to use it.</p>
<ul>
<li><code>newScope</code> (<code>AttrSet -&gt; scope</code>)</li>
</ul>
<p>Takes an attribute set <code>attrs</code> and returns a scope that extends the original scope.</p>
<ul>
<li><code>overrideScope</code> (<code>(scope -&gt; scope -&gt; AttrSet) -&gt; scope</code>)</li>
</ul>
<p>Takes a function <code>g</code> of the form <code>final: prev: { # attributes }</code> to act as an overlay on <code>f</code>, and returns a new scope with values determined by <code>extends g f</code>.
See <a href="https://nixos.org/manual/nixpkgs/unstable/#function-library-lib.fixedPoints.extends"></a> for details.</p>
<p>This allows subsequent modification of the final attribute set in a consistent way, i.e. all functions <code>p</code> invoked with <code>callPackage</code> will be called with the modified values.</p>
<ul>
<li><code>packages</code> (<code>AttrSet -&gt; AttrSet</code>)</li>
</ul>
<p>The value of the argument <code>f</code> to <code>makeScope</code>.</p>
<ul>
<li>final attributes</li>
</ul>
<p>The final values returned by <code>f</code>.</p>
<h3 id="examples_2">Examples</h3>
<p>{#ex-makeScope .example}</p>
<h3 id="create-an-interdependent-package-set-on-top-of-pkgs">Create an interdependent package set on top of <code>pkgs</code></h3>
<p>The functions in <code>foo.nix</code> and <code>bar.nix</code> can depend on each other, in the sense that <code>foo.nix</code> can contain a function that expects <code>bar</code> as an attribute in its argument.</p>
<div class="highlight"><pre><span></span><code><span class="k">let</span>
<span class="ss">pkgs</span> <span class="o">=</span> <span class="nb">import</span> <span class="l">&lt;nixpkgs&gt;</span> <span class="p">{</span> <span class="p">};</span>
<span class="k">in</span>
pkgs<span class="o">.</span>lib<span class="o">.</span>makeScope pkgs<span class="o">.</span>newScope <span class="p">(</span>self<span class="p">:</span> <span class="p">{</span>
<span class="ss">foo</span> <span class="o">=</span> self<span class="o">.</span>callPackage <span class="l">./foo.nix</span> <span class="p">{</span> <span class="p">};</span>
<span class="ss">bar</span> <span class="o">=</span> self<span class="o">.</span>callPackage <span class="l">./bar.nix</span> <span class="p">{</span> <span class="p">};</span>
<span class="p">})</span>
</code></pre></div>
<p>evaluates to</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="ss">callPackage</span> <span class="o">=</span> <span class="err">«</span>lambda<span class="err">»</span><span class="p">;</span>
<span class="ss">newScope</span> <span class="o">=</span> <span class="err">«</span>lambda<span class="err">»</span><span class="p">;</span>
<span class="ss">overrideScope</span> <span class="o">=</span> <span class="err">«</span>lambda<span class="err">»</span><span class="p">;</span>
<span class="ss">packages</span> <span class="o">=</span> <span class="err">«</span>lambda<span class="err">»</span><span class="p">;</span>
<span class="ss">foo</span> <span class="o">=</span> <span class="err">«</span><span class="nb">derivation</span><span class="err">»</span><span class="p">;</span>
<span class="ss">bar</span> <span class="o">=</span> <span class="err">«</span><span class="nb">derivation</span><span class="err">»</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
<p>{#ex-makeScope-callPackage .example}</p>
<h3 id="using-callpackage-from-a-scope">Using <code>callPackage</code> from a scope</h3>
<div class="highlight"><pre><span></span><code><span class="k">let</span>
<span class="ss">pkgs</span> <span class="o">=</span> <span class="nb">import</span> <span class="l">&lt;nixpkgs&gt;</span> <span class="p">{</span> <span class="p">};</span>
<span class="k">inherit</span> <span class="p">(</span>pkgs<span class="p">)</span> lib<span class="p">;</span>
<span class="ss">scope</span> <span class="o">=</span> lib<span class="o">.</span>makeScope lib<span class="o">.</span>callPackageWith <span class="p">(</span>self<span class="p">:</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="p">});</span>
<span class="ss">three</span> <span class="o">=</span> scope<span class="o">.</span>callPackage <span class="p">({</span> a<span class="p">,</span> b <span class="p">}:</span> a <span class="o">+</span> b<span class="p">)</span> <span class="p">{</span> <span class="p">};</span>
<span class="ss">four</span> <span class="o">=</span> scope<span class="o">.</span>callPackage <span class="p">({</span> a<span class="p">,</span> b <span class="p">}:</span> a <span class="o">+</span> b<span class="p">)</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="p">};</span>
<span class="k">in</span>
<span class="p">[</span> three four <span class="p">]</span>
</code></pre></div>
<p>evaluates to</p>
<div class="highlight"><pre><span></span><code><span class="p">[</span> <span class="mi">3</span> <span class="mi">4</span> <span class="p">]</span>
</code></pre></div>
<h3 id="type_6">Type</h3>
<div class="highlight"><pre><span></span><code>makeScope :: (AttrSet -&gt; ((AttrSet -&gt; a) | Path) -&gt; AttrSet -&gt; a) -&gt; (AttrSet -&gt; AttrSet) -&gt; scope
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/customisation.nix#L541">lib/customisation.nix:541</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.customisation.makeScopeWithSplicing"><code>lib.customisation.makeScopeWithSplicing</code></h2>
<p>backward compatibility with old uncurried form; deprecated</p>
<h3 id="inputs_7">Inputs</h3>
<p><code>splicePackages</code></p>
<p>: 1. Function argument</p>
<p><code>newScope</code></p>
<p>: 2. Function argument</p>
<p><code>otherSplices</code></p>
<p>: 3. Function argument</p>
<p><code>keep</code></p>
<p>: 4. Function argument</p>
<p><code>extra</code></p>
<p>: 5. Function argument</p>
<p><code>f</code></p>
<p>: 6. Function argument</p>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/customisation.nix#L584">lib/customisation.nix:584</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.customisation.makeScopeWithSplicing-prime"><code>lib.customisation.makeScopeWithSplicing'</code></h2>
<p>Like makeScope, but aims to support cross compilation. It's still ugly, but
hopefully it helps a little bit.</p>
<h3 id="type_7">Type</h3>
<div class="highlight"><pre><span></span><code>makeScopeWithSplicing&#39; ::
{ splicePackages :: Splice -&gt; AttrSet
, newScope :: AttrSet -&gt; ((AttrSet -&gt; a) | Path) -&gt; AttrSet -&gt; a
}
-&gt; { otherSplices :: Splice, keep :: AttrSet -&gt; AttrSet, extra :: AttrSet -&gt; AttrSet }
-&gt; AttrSet
Splice ::
{ pkgsBuildBuild :: AttrSet
, pkgsBuildHost :: AttrSet
, pkgsBuildTarget :: AttrSet
, pkgsHostHost :: AttrSet
, pkgsHostTarget :: AttrSet
, pkgsTargetTarget :: AttrSet
}
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/customisation.nix#L614">lib/customisation.nix:614</a> in <code>&lt;nixpkgs&gt;</code>.</p>
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