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<h1 id="common-environment-variables">Common Environment Variables</h1>
<p>Most commands in Lix interpret the following environment variables:</p>
<ul>
<li>
<p><span id="env-IN_NIX_SHELL"><a href="#env-IN_NIX_SHELL"><code>IN_NIX_SHELL</code></a></span>
Indicator that tells if the current environment was set up by
<code>nix-shell</code>. It can have the values <code>pure</code> or <code>impure</code>.</p>
</li>
<li>
<p><span id="env-NIX_PATH"><a href="#env-NIX_PATH"><code>NIX_PATH</code></a></span>
A colon-separated list of directories used to look up the location of Nix
expressions using <a href="../../language/values/#type-path">paths</a>
enclosed in angle brackets (i.e., <code>&lt;path&gt;</code>),
e.g. <code>/home/eelco/Dev:/etc/nixos</code>. It can be extended using the
<a href="../opt-common/#opt-I"><code>-I</code> option</a>.</p>
<p>If <code>NIX_PATH</code> is not set at all, Lix will fall back to the following list in <a href="../conf-file/#conf-pure-eval">impure</a> and <a href="../conf-file/#conf-restrict-eval">unrestricted</a> evaluation mode:</p>
<ol>
<li><code>$HOME/.nix-defexpr/channels</code></li>
<li><code>nixpkgs=/nix/var/nix/profiles/per-user/root/channels/nixpkgs</code></li>
<li><code>/nix/var/nix/profiles/per-user/root/channels</code></li>
</ol>
<p>If <code>NIX_PATH</code> is set to an empty string, resolving search paths will always fail.
For example, attempting to use <code>&lt;nixpkgs&gt;</code> will produce:</p>
<div class="highlight"><pre><span></span><code>error: file &#39;nixpkgs&#39; was not found in the Nix search path
</code></pre></div>
</li>
<li>
<p><span id="env-NIX_IGNORE_SYMLINK_STORE"><a href="#env-NIX_IGNORE_SYMLINK_STORE"><code>NIX_IGNORE_SYMLINK_STORE</code></a></span>
Normally, the Nix store directory (typically <code>/nix/store</code>) is not
allowed to contain any symlink components. This is to prevent
“impure” builds. Builders sometimes “canonicalise” paths by
resolving all symlink components. Thus, builds on different machines
(with <code>/nix/store</code> resolving to different locations) could yield
different results. This is generally not a problem, except when
builds are deployed to machines where <code>/nix/store</code> resolves
differently. If you are sure that youre not going to do that, you
can set <code>NIX_IGNORE_SYMLINK_STORE</code> to <code>1</code>.</p>
<p>Note that if youre symlinking the Nix store so that you can put it
on another file system than the root file system, on Linux youre
better off using <code>bind</code> mount points, e.g.,</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>mkdir<span class="w"> </span>/nix
<span class="gp">$ </span>mount<span class="w"> </span>-o<span class="w"> </span><span class="nb">bind</span><span class="w"> </span>/mnt/otherdisk/nix<span class="w"> </span>/nix
</code></pre></div>
<p>Consult the mount 8 manual page for details.</p>
</li>
<li>
<p><span id="env-NIX_STORE_DIR"><a href="#env-NIX_STORE_DIR"><code>NIX_STORE_DIR</code></a></span>
Overrides the location of the Nix store (default <code>prefix/store</code>).</p>
</li>
<li>
<p><span id="env-NIX_DATA_DIR"><a href="#env-NIX_DATA_DIR"><code>NIX_DATA_DIR</code></a></span>
Overrides the location of the Lix static data directory (default
<code>prefix/share</code>).</p>
</li>
<li>
<p><span id="env-NIX_LOG_DIR"><a href="#env-NIX_LOG_DIR"><code>NIX_LOG_DIR</code></a></span>
Overrides the location of the Lix log directory (default
<code>prefix/var/log/nix</code>).</p>
</li>
<li>
<p><span id="env-NIX_STATE_DIR"><a href="#env-NIX_STATE_DIR"><code>NIX_STATE_DIR</code></a></span>
Overrides the location of the Lix state directory (default
<code>prefix/var/nix</code>).</p>
</li>
<li>
<p><span id="env-NIX_CONF_DIR"><a href="#env-NIX_CONF_DIR"><code>NIX_CONF_DIR</code></a></span>
Overrides the location of the system Lix configuration directory
(default <code>prefix/etc/nix</code>).</p>
</li>
<li>
<p><span id="env-NIX_CONFIG"><a href="#env-NIX_CONFIG"><code>NIX_CONFIG</code></a></span>
Applies settings from Lix configuration from the environment.
The content is treated as if it was read from a Lix configuration file.
Settings are separated by the newline character.</p>
</li>
<li>
<p><span id="env-NIX_USER_CONF_FILES"><a href="#env-NIX_USER_CONF_FILES"><code>NIX_USER_CONF_FILES</code></a></span>
Overrides the location of the Lix user configuration files to load from.</p>
<p>The default are the locations according to the <a href="https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html">XDG Base Directory Specification</a>.
See the <a href="#xdg-base-directories">XDG Base Directories</a> sub-section for details.</p>
<p>The variable is treated as a list separated by the <code>:</code> token.</p>
</li>
<li>
<p><span id="env-TMPDIR"><a href="#env-TMPDIR"><code>TMPDIR</code></a></span>
Use the specified directory to store temporary files. In particular,
this includes temporary build directories; these can take up
substantial amounts of disk space. The default is <code>/tmp</code>.</p>
</li>
<li>
<p><span id="env-NIX_REMOTE"><a href="#env-NIX_REMOTE"><code>NIX_REMOTE</code></a></span>
This variable should be set to <code>daemon</code> if you want to use the Lix
daemon to execute Nix operations. This is necessary in <a href="../../installation/multi-user/">multi-user
Nix installations</a>. If the Lix
daemon's Unix socket is at some non-standard path, this variable
should be set to <code>unix://path/to/socket</code>. Otherwise, it should be
left unset.</p>
</li>
<li>
<p><span id="env-NIX_SHOW_STATS"><a href="#env-NIX_SHOW_STATS"><code>NIX_SHOW_STATS</code></a></span>
If set to <code>1</code>, Lix will print some evaluation statistics, such as
the number of values allocated.</p>
</li>
<li>
<p><span id="env-NIX_COUNT_CALLS"><a href="#env-NIX_COUNT_CALLS"><code>NIX_COUNT_CALLS</code></a></span>
If set to <code>1</code>, Lix will print how often functions were called during
Nix expression evaluation. This is useful for profiling your Nix
expressions.</p>
</li>
<li>
<p><span id="env-GC_INITIAL_HEAP_SIZE"><a href="#env-GC_INITIAL_HEAP_SIZE"><code>GC_INITIAL_HEAP_SIZE</code></a></span>
If Nix has been configured to use the Boehm garbage collector, this
variable sets the initial size of the heap in bytes. It defaults to
384 MiB. Setting it to a low value reduces memory consumption, but
will increase runtime due to the overhead of garbage collection.</p>
</li>
</ul>
<h3 id="xdg-base-directories">XDG Base Directories</h3>
<p>Lix follows the <a href="https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html">XDG Base Directory Specification</a>.</p>
<p>For backwards compatibility, commands in Lix will follow the standard only when [<code>use-xdg-base-directories</code>] is enabled.
<a href="../New-CLI/nix/">New Nix commands</a> (experimental) conform to the standard by default.</p>
<p>The following environment variables are used to determine locations of various state and configuration files:</p>
<ul>
<li><code>XDG_CONFIG_HOME</code> (default <code>~/.config</code>)</li>
<li><code>XDG_STATE_HOME</code> (default <code>~/.local/state</code>)</li>
<li><code>XDG_CACHE_HOME</code> (default <code>~/.cache</code>)</li>
</ul>
</article>
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