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<h1 id="breakpointhook">breakpointHook</h1>
<p>This hook will make a build pause instead of stopping when a failure happens. It prevents nix from cleaning up the build environment immediately and allows the user to attach to a build environment using the <code>cntr</code> command. Upon build error it will print instructions on how to use <code>cntr</code>, which can be used to enter the environment for debugging. Installing cntr and running the command will provide shell access to the build sandbox of failed build. At <code>/var/lib/cntr</code> the sandboxed filesystem is mounted. All commands and files of the system are still accessible within the shell. To execute commands from the sandbox use the cntr exec subcommand. <code>cntr</code> is only supported on Linux-based platforms. To use it first add <code>cntr</code> to your <code>environment.systemPackages</code> on NixOS or alternatively to the root user on non-NixOS systems. Then in the package that is supposed to be inspected, add <code>breakpointHook</code> to <code>nativeBuildInputs</code>.</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="ss">nativeBuildInputs</span> <span class="o">=</span> <span class="p">[</span> breakpointHook <span class="p">];</span>
<span class="p">}</span>
</code></pre></div>
<p>When a build failure happens there will be an instruction printed that shows how to attach with <code>cntr</code> to the build sandbox.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Caution with remote builds</p>
</div>
<p>This won’t work with remote builds as the build environment is on a different machine and can’t be accessed by <code>cntr</code>. Remote builds can be turned off by setting <code>--option builders ''</code> for <code>nix-build</code> or <code>--builders ''</code> for <code>nix build</code>.</p>
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