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<h1 id="sec-functions-library-path">lib.path: path functions</h1>
<p>Functions for working with path values.</p>
<h2 id="function-library-lib.path.append"><code>lib.path.append</code></h2>
<p><strong>Type</strong>: <code>append :: Path -&gt; String -&gt; Path</code></p>
<p>Append a subpath string to a path.</p>
<p>Like <code>path + ("/" + string)</code> but safer, because it errors instead of returning potentially surprising results.
More specifically, it checks that the first argument is a <a href="https://nixos.org/manual/nix/stable/language/values.html#type-path&quot;">path value type</a>,
and that the second argument is a <a href="#function-library-lib.path.subpath.isValid">valid subpath string</a>.</p>
<p>Laws:</p>
<ul>
<li>
<p>Not influenced by subpath <a href="#function-library-lib.path.subpath.normalise">normalisation</a>:</p>
<p>append p s == append p (subpath.normalise s)</p>
</li>
</ul>
<p><code>path</code></p>
<p>: The absolute path to append to</p>
<p><code>subpath</code></p>
<p>: The subpath string to append</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<h1 id="libpathappend-usage-example"><code>lib.path.append</code> usage example</h1>
</div>
<div class="highlight"><pre><span></span><code>append <span class="l">/foo</span> <span class="s2">&quot;bar/baz&quot;</span>
<span class="o">=&gt;</span> <span class="l">/foo/bar/baz</span> <span class="s2">&quot;subpaths don&#39;t need to be normalised</span>
<span class="s2">append /foo &quot;</span><span class="l">./bar</span><span class="o">//</span><span class="l">baz/.</span><span class="o">/</span><span class="s2">&quot;</span>
<span class="s2">=&gt; /foo/bar/baz &quot;</span>can append to root directory
append <span class="l">/.</span> <span class="s2">&quot;foo/bar&quot;</span>
<span class="o">=&gt;</span> <span class="l">/foo/bar</span> <span class="s2">&quot;first argument needs to be a path value type</span>
<span class="s2">append &quot;</span><span class="l">/foo</span><span class="s2">&quot; &quot;</span>bar<span class="s2">&quot;</span>
<span class="s2">=&gt; &lt;error&gt; &quot;</span>second argument needs to be a valid subpath string
append <span class="l">/foo</span> <span class="l">/bar</span>
<span class="o">=&gt;</span> <span class="l">&lt;error&gt;</span>
append <span class="l">/foo</span> <span class="s2">&quot;&quot;</span>
<span class="o">=&gt;</span> <span class="l">&lt;error&gt;</span>
append <span class="l">/foo</span> <span class="s2">&quot;/bar&quot;</span>
<span class="o">=&gt;</span> <span class="l">&lt;error&gt;</span>
append <span class="l">/foo</span> <span class="s2">&quot;../bar&quot;</span>
<span class="o">=&gt;</span> <span class="l">&lt;error&gt;</span>
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/path/default.nix#L192">lib/path/default.nix:192</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.path.hasPrefix"><code>lib.path.hasPrefix</code></h2>
<p><strong>Type</strong>: <code>hasPrefix :: Path -&gt; Path -&gt; Bool</code></p>
<p>Whether the first path is a component-wise prefix of the second path.</p>
<p>Laws:</p>
<ul>
<li>
<p><code>hasPrefix p q</code> is only true if <a href="#function-library-lib.path.append"><code>q == append p s</code></a> for some <a href="#function-library-lib.path.subpath.isValid">subpath</a> <code>s</code>.</p>
</li>
<li>
<p><code>hasPrefix</code> is a <a href="https://en.wikipedia.org/wiki/Partially_ordered_set#Non-strict_partial_order">non-strict partial order</a> over the set of all path values.</p>
</li>
</ul>
<p><code>path1</code></p>
<p>: Function argument</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<h1 id="libpathhasprefix-usage-example"><code>lib.path.hasPrefix</code> usage example</h1>
</div>
<div class="highlight"><pre><span></span><code>hasPrefix <span class="l">/foo</span> <span class="l">/foo/bar</span>
<span class="o">=&gt;</span> <span class="no">true</span>
hasPrefix <span class="l">/foo</span> <span class="l">/foo</span>
<span class="o">=&gt;</span> <span class="no">true</span>
hasPrefix <span class="l">/foo/bar</span> <span class="l">/foo</span>
<span class="o">=&gt;</span> <span class="no">false</span>
hasPrefix <span class="l">/.</span> <span class="l">/foo</span>
<span class="o">=&gt;</span> <span class="no">true</span>
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/path/default.nix#L226">lib/path/default.nix:226</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.path.removePrefix"><code>lib.path.removePrefix</code></h2>
<p><strong>Type</strong>: <code>removePrefix :: Path -&gt; Path -&gt; String</code></p>
<p>Remove the first path as a component-wise prefix from the second path.
The result is a <a href="#function-library-lib.path.subpath.normalise">normalised subpath string</a>.</p>
<p>Laws:</p>
<ul>
<li>
<p>Inverts <a href="#function-library-lib.path.append"><code>append</code></a> for <a href="#function-library-lib.path.subpath.normalise">normalised subpath string</a>:</p>
<p>removePrefix p (append p s) == subpath.normalise s</p>
</li>
</ul>
<p><code>path1</code></p>
<p>: Function argument</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<h1 id="libpathremoveprefix-usage-example"><code>lib.path.removePrefix</code> usage example</h1>
</div>
<div class="highlight"><pre><span></span><code>removePrefix <span class="l">/foo</span> <span class="l">/foo/bar/baz</span>
<span class="o">=&gt;</span> <span class="s2">&quot;./bar/baz&quot;</span>
removePrefix <span class="l">/foo</span> <span class="l">/foo</span>
<span class="o">=&gt;</span> <span class="s2">&quot;./.&quot;</span>
removePrefix <span class="l">/foo/bar</span> <span class="l">/foo</span>
<span class="o">=&gt;</span> <span class="l">&lt;error&gt;</span>
removePrefix <span class="l">/.</span> <span class="l">/foo</span>
<span class="o">=&gt;</span> <span class="s2">&quot;./foo&quot;</span>
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/path/default.nix#L271">lib/path/default.nix:271</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.path.splitRoot"><code>lib.path.splitRoot</code></h2>
<p><strong>Type</strong>: <code>splitRoot :: Path -&gt; { root :: Path, subpath :: String }</code></p>
<p>Split the filesystem root from a <a href="https://nixos.org/manual/nix/stable/language/values.html#type-path">path</a>.
The result is an attribute set with these attributes:
- <code>root</code>: The filesystem root of the path, meaning that this directory has no parent directory.
- <code>subpath</code>: The <a href="#function-library-lib.path.subpath.normalise">normalised subpath string</a> that when <a href="#function-library-lib.path.append">appended</a> to <code>root</code> returns the original path.</p>
<p>Laws:
- <a href="#function-library-lib.path.append">Appending</a> the <code>root</code> and <code>subpath</code> gives the original path:</p>
<div class="highlight"><pre><span></span><code> p ==
append
(splitRoot p).root
(splitRoot p).subpath
</code></pre></div>
<ul>
<li>
<p>Trying to get the parent directory of <code>root</code> using <a href="https://nixos.org/manual/nix/stable/language/builtins.html#builtins-readDir"><code>readDir</code></a> returns <code>root</code> itself:</p>
<p>dirOf (splitRoot p).root == (splitRoot p).root</p>
</li>
</ul>
<p><code>path</code></p>
<p>: The path to split the root off of</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<h1 id="libpathsplitroot-usage-example"><code>lib.path.splitRoot</code> usage example</h1>
</div>
<div class="highlight"><pre><span></span><code>splitRoot <span class="l">/foo/bar</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">root</span> <span class="o">=</span> <span class="l">/.</span><span class="p">;</span> <span class="ss">subpath</span> <span class="o">=</span> <span class="s2">&quot;./foo/bar&quot;</span><span class="p">;</span> <span class="p">}</span>
splitRoot <span class="l">/.</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">root</span> <span class="o">=</span> <span class="l">/.</span><span class="p">;</span> <span class="ss">subpath</span> <span class="o">=</span> <span class="s2">&quot;./.&quot;</span><span class="p">;</span> <span class="p">}</span> <span class="s2">&quot;Nix neutralises `..` path components for all path values automatically</span>
<span class="s2">splitRoot /foo/../bar</span>
<span class="s2">=&gt; { root = /.; subpath = &quot;</span><span class="l">./bar</span><span class="s2">&quot;; }</span>
<span class="s2">splitRoot &quot;</span><span class="l">/foo/bar</span><span class="s2">&quot;</span>
<span class="s2">=&gt; &lt;error&gt;</span>
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/path/default.nix#L336">lib/path/default.nix:336</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.path.hasStorePathPrefix"><code>lib.path.hasStorePathPrefix</code></h2>
<p><strong>Type</strong>: <code>hasStorePathPrefix :: Path -&gt; Bool</code></p>
<p>Whether a <a href="https://nixos.org/manual/nix/stable/language/values.html#type-path">path</a>
has a <a href="https://nixos.org/manual/nix/stable/store/store-path.html#store-path">store path</a>
as a prefix.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>As with all functions of this <code>lib.path</code> library, it does not work on paths in strings,
which is how you'd typically get store paths.</p>
</div>
<p>Instead, this function only handles path values themselves,
which occur when Nix files in the store use relative path expressions.</p>
<p><code>path</code></p>
<p>: Function argument</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<h1 id="libpathhasstorepathprefix-usage-example"><code>lib.path.hasStorePathPrefix</code> usage example</h1>
</div>
<div class="highlight"><pre><span></span><code><span class="c1"># Subpaths of derivation outputs have a store path as a prefix</span>
hasStorePathPrefix <span class="l">/nix/store/nvl9ic0pj1fpyln3zaqrf4cclbqdfn1j-foo/bar/baz</span>
<span class="o">=&gt;</span> <span class="no">true</span> <span class="s2">&quot;The store directory itself is not a store path</span>
<span class="s2">hasStorePathPrefix /nix/store</span>
<span class="s2">=&gt; false &quot;</span>Derivation outputs are store paths themselves
hasStorePathPrefix <span class="l">/nix/store/nvl9ic0pj1fpyln3zaqrf4cclbqdfn1j-foo</span>
<span class="o">=&gt;</span> <span class="no">true</span> <span class="s2">&quot;Paths outside the Nix store don&#39;t have a store path prefix</span>
<span class="s2">hasStorePathPrefix /home/user</span>
<span class="s2">=&gt; false &quot;</span>Not all paths under the Nix store are store paths
hasStorePathPrefix <span class="l">/nix/store/.links/10gg8k3rmbw8p7gszarbk7qyd9jwxhcfq9i6s5i0qikx8alkk4hq</span>
<span class="o">=&gt;</span> <span class="no">false</span> <span class="s2">&quot;Store derivations are also store paths themselves</span>
<span class="s2">hasStorePathPrefix /nix/store/nvl9ic0pj1fpyln3zaqrf4cclbqdfn1j-foo.drv</span>
<span class="s2">=&gt; true</span>
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/path/default.nix#L390">lib/path/default.nix:390</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.path.subpath.isValid"><code>lib.path.subpath.isValid</code></h2>
<p><strong>Type</strong>: <code>subpath.isValid :: String -&gt; Bool</code></p>
<p>Whether a value is a valid subpath string.</p>
<p>A subpath string points to a specific file or directory within an absolute base directory.
It is a stricter form of a relative path that excludes <code>..</code> components, since those could escape the base directory.</p>
<ul>
<li>
<p>The value is a string.</p>
</li>
<li>
<p>The string is not empty.</p>
</li>
<li>
<p>The string doesn't start with a <code>/</code>.</p>
</li>
<li>
<p>The string doesn't contain any <code>..</code> path components.</p>
</li>
</ul>
<p><code>value</code></p>
<p>: The value to check</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<h1 id="libpathsubpathisvalid-usage-example"><code>lib.path.subpath.isValid</code> usage example</h1>
</div>
<div class="highlight"><pre><span></span><code><span class="c1"># Not a string</span>
subpath<span class="o">.</span>isValid <span class="no">null</span>
<span class="o">=&gt;</span> <span class="no">false</span> <span class="s2">&quot;Empty string</span>
<span class="s2">subpath.isValid &quot;&quot;</span>
<span class="s2">=&gt; false &quot;</span>Absolute path
subpath<span class="o">.</span>isValid <span class="s2">&quot;/foo&quot;</span>
<span class="o">=&gt;</span> <span class="no">false</span> <span class="s2">&quot;Contains a `..` path component</span>
<span class="s2">subpath.isValid &quot;</span><span class="l">../foo</span><span class="s2">&quot;</span>
<span class="s2">=&gt; false &quot;</span>Valid subpath
subpath<span class="o">.</span>isValid <span class="s2">&quot;foo/bar&quot;</span>
<span class="o">=&gt;</span> <span class="no">true</span> <span class="s2">&quot;Doesn&#39;t need to be normalised</span>
<span class="s2">subpath.isValid &quot;</span><span class="l">./foo</span><span class="o">//</span>bar<span class="o">/</span><span class="s2">&quot;</span>
<span class="s2">=&gt; true</span>
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/path/default.nix#L447">lib/path/default.nix:447</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.path.subpath.join"><code>lib.path.subpath.join</code></h2>
<p><strong>Type</strong>: <code>subpath.join :: [ String ] -&gt; String</code></p>
<p>Join subpath strings together using <code>/</code>, returning a normalised subpath string.</p>
<p>Like <code>concatStringsSep "/"</code> but safer, specifically:</p>
<ul>
<li>
<p>All elements must be <a href="#function-library-lib.path.subpath.isValid">valid subpath strings</a>.</p>
</li>
<li>
<p>The result gets <a href="#function-library-lib.path.subpath.normalise">normalised</a>.</p>
</li>
<li>
<p>The edge case of an empty list gets properly handled by returning the neutral subpath <code>"./."</code>.</p>
</li>
</ul>
<p>Laws:</p>
<ul>
<li>
<p>Associativity:</p>
<p>subpath.join [ x (subpath.join [ y z ]) ] == subpath.join [ (subpath.join [ x y ]) z ]</p>
</li>
<li>
<p>Identity - <code>"./."</code> is the neutral element for normalised paths:</p>
<p>subpath.join [ ] == "./."
subpath.join [ (subpath.normalise p) "./." ] == subpath.normalise p
subpath.join [ "./." (subpath.normalise p) ] == subpath.normalise p</p>
</li>
<li>
<p>Normalisation - the result is <a href="#function-library-lib.path.subpath.normalise">normalised</a>:</p>
<p>subpath.join ps == subpath.normalise (subpath.join ps)</p>
</li>
<li>
<p>For non-empty lists, the implementation is equivalent to <a href="#function-library-lib.path.subpath.normalise">normalising</a> the result of <code>concatStringsSep "/"</code>.
Note that the above laws can be derived from this one:</p>
<p>ps != [] -&gt; subpath.join ps == subpath.normalise (concatStringsSep "/" ps)</p>
</li>
</ul>
<p><code>subpaths</code></p>
<p>: The list of subpaths to join together</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<h1 id="libpathsubpathjoin-usage-example"><code>lib.path.subpath.join</code> usage example</h1>
</div>
<div class="highlight"><pre><span></span><code>subpath<span class="o">.</span>join <span class="p">[</span> <span class="s2">&quot;foo&quot;</span> <span class="s2">&quot;bar/baz&quot;</span> <span class="p">]</span>
<span class="o">=&gt;</span> <span class="s2">&quot;./foo/bar/baz&quot;</span> <span class="s2">&quot;normalise the result</span>
<span class="s2">subpath.join [ &quot;</span><span class="l">./foo</span><span class="s2">&quot; &quot;</span><span class="o">.</span><span class="s2">&quot; &quot;</span>bar<span class="o">//</span><span class="l">./baz</span><span class="o">/</span><span class="s2">&quot; ]</span>
<span class="s2">=&gt; &quot;</span><span class="l">./foo/bar/baz</span><span class="s2">&quot; &quot;</span>passing an empty list results <span class="k">in</span> the current directory
subpath<span class="o">.</span>join <span class="p">[</span> <span class="p">]</span>
<span class="o">=&gt;</span> <span class="s2">&quot;./.&quot;</span> <span class="s2">&quot;elements must be valid subpath strings</span>
<span class="s2">subpath.join [ /foo ]</span>
<span class="s2">=&gt; &lt;error&gt;</span>
<span class="s2">subpath.join [ &quot;&quot; ]</span>
<span class="s2">=&gt; &lt;error&gt;</span>
<span class="s2">subpath.join [ &quot;</span><span class="l">/foo</span><span class="s2">&quot; ]</span>
<span class="s2">=&gt; &lt;error&gt;</span>
<span class="s2">subpath.join [ &quot;</span><span class="l">../foo</span><span class="s2">&quot; ]</span>
<span class="s2">=&gt; &lt;error&gt;</span>
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/path/default.nix#L510">lib/path/default.nix:510</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.path.subpath.components"><code>lib.path.subpath.components</code></h2>
<p><strong>Type</strong>: <code>subpath.components :: String -&gt; [ String ]</code></p>
<p>Split <a href="#function-library-lib.path.subpath.isValid">a subpath</a> into its path component strings.
Throw an error if the subpath isn't valid.
Note that the returned path components are also <a href="#function-library-lib.path.subpath.isValid">valid subpath strings</a>, though they are intentionally not <a href="#function-library-lib.path.subpath.normalise">normalised</a>.</p>
<p>Laws:</p>
<ul>
<li>
<p>Splitting a subpath into components and <a href="#function-library-lib.path.subpath.join">joining</a> the components gives the same subpath but <a href="#function-library-lib.path.subpath.normalise">normalised</a>:</p>
<p>subpath.join (subpath.components s) == subpath.normalise s</p>
</li>
</ul>
<p><code>subpath</code></p>
<p>: The subpath string to split into components</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<h1 id="libpathsubpathcomponents-usage-example"><code>lib.path.subpath.components</code> usage example</h1>
</div>
<div class="highlight"><pre><span></span><code>subpath<span class="o">.</span>components <span class="s2">&quot;.&quot;</span>
<span class="o">=&gt;</span> <span class="p">[</span> <span class="p">]</span>
subpath<span class="o">.</span>components <span class="s2">&quot;./foo//bar/./baz/&quot;</span>
<span class="o">=&gt;</span> <span class="p">[</span> <span class="s2">&quot;foo&quot;</span> <span class="s2">&quot;bar&quot;</span> <span class="s2">&quot;baz&quot;</span> <span class="p">]</span>
subpath<span class="o">.</span>components <span class="s2">&quot;/foo&quot;</span>
<span class="o">=&gt;</span> <span class="l">&lt;error&gt;</span>
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/path/default.nix#L552">lib/path/default.nix:552</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.path.subpath.normalise"><code>lib.path.subpath.normalise</code></h2>
<p><strong>Type</strong>: <code>subpath.normalise :: String -&gt; String</code></p>
<p>Normalise a subpath. Throw an error if the subpath isn't <a href="#function-library-lib.path.subpath.isValid">valid</a>.</p>
<ul>
<li>
<p>Limit repeating <code>/</code> to a single one.</p>
</li>
<li>
<p>Remove redundant <code>.</code> components.</p>
</li>
<li>
<p>Remove trailing <code>/</code> and <code>/.</code>.</p>
</li>
<li>
<p>Add leading <code>./</code>.</p>
</li>
</ul>
<p>Laws:</p>
<ul>
<li>
<p>Idempotency - normalising multiple times gives the same result:</p>
<p>subpath.normalise (subpath.normalise p) == subpath.normalise p</p>
</li>
<li>
<p>Uniqueness - there's only a single normalisation for the paths that lead to the same file system node:</p>
<p>subpath.normalise p != subpath.normalise q -&gt; $(realpath ${p}) != $(realpath ${q})</p>
</li>
<li>
<p>Don't change the result when <a href="#function-library-lib.path.append">appended</a> to a Nix path value:</p>
<p>append base p == append base (subpath.normalise p)</p>
</li>
<li>
<p>Don't change the path according to <code>realpath</code>:</p>
<p>$(realpath ${p}) == $(realpath ${subpath.normalise p})</p>
</li>
<li>
<p>Only error on <a href="#function-library-lib.path.subpath.isValid">invalid subpaths</a>:</p>
<p>builtins.tryEval (subpath.normalise p)).success == subpath.isValid p</p>
</li>
</ul>
<p><code>subpath</code></p>
<p>: The subpath string to normalise</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<h1 id="libpathsubpathnormalise-usage-example"><code>lib.path.subpath.normalise</code> usage example</h1>
</div>
<div class="highlight"><pre><span></span><code><span class="c1"># limit repeating `/` to a single one</span>
subpath<span class="o">.</span>normalise <span class="s2">&quot;foo//bar&quot;</span>
<span class="o">=&gt;</span> <span class="s2">&quot;./foo/bar&quot;</span> <span class="s2">&quot;remove redundant `.` components</span>
<span class="s2">subpath.normalise &quot;</span><span class="l">foo/./bar</span><span class="s2">&quot;</span>
<span class="s2">=&gt; &quot;</span><span class="l">./foo/bar</span><span class="s2">&quot; &quot;</span>add leading <span class="err">`</span><span class="o">./</span><span class="err">`</span>
subpath<span class="o">.</span>normalise <span class="s2">&quot;foo/bar&quot;</span>
<span class="o">=&gt;</span> <span class="s2">&quot;./foo/bar&quot;</span> <span class="s2">&quot;remove trailing `/`</span>
<span class="s2">subpath.normalise &quot;</span><span class="l">foo/bar</span><span class="o">/</span><span class="s2">&quot;</span>
<span class="s2">=&gt; &quot;</span><span class="l">./foo/bar</span><span class="s2">&quot; &quot;</span>remove trailing <span class="err">`</span><span class="l">/.</span><span class="err">`</span>
subpath<span class="o">.</span>normalise <span class="s2">&quot;foo/bar/.&quot;</span>
<span class="o">=&gt;</span> <span class="s2">&quot;./foo/bar&quot;</span> <span class="s2">&quot;Return the current directory as `./.`</span>
<span class="s2">subpath.normalise &quot;</span><span class="o">.</span><span class="s2">&quot;</span>
<span class="s2">=&gt; &quot;</span><span class="l">./.</span><span class="s2">&quot; &quot;</span>error on <span class="err">`</span><span class="o">..</span><span class="err">`</span> path components
subpath<span class="o">.</span>normalise <span class="s2">&quot;foo/../bar&quot;</span>
<span class="o">=&gt;</span> <span class="l">&lt;error&gt;</span> <span class="s2">&quot;error on empty string</span>
<span class="s2">subpath.normalise &quot;&quot;</span>
<span class="s2">=&gt; &lt;error&gt; &quot;</span>error on absolute path
subpath<span class="o">.</span>normalise <span class="s2">&quot;/foo&quot;</span>
<span class="o">=&gt;</span> <span class="l">&lt;error&gt;</span>
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/path/default.nix#L633">lib/path/default.nix:633</a> in <code>&lt;nixpkgs&gt;</code>.</p>
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