doc: add example usage for breakpointHook (#51005)
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@ -2455,7 +2455,17 @@ addEnvHooks "$hostOffset" myBashFunction
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use the cntr exec subcommand. Note that <command>cntr</command> also
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needs to be executed on the machine that is doing the build, which might
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be not the case when remote builders are enabled.
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<command>cntr</command> is only supported on linux based platforms.
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<command>cntr</command> is only supported on Linux-based platforms. To
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use it first add <literal>cntr</literal> to your
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<literal>environment.systemPackages</literal> on NixOS or alternatively to
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the root user on non-NixOS systems. Then in the package that is supposed
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to be inspected, add <literal>breakpointHook</literal> to
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<literal>nativeBuildInputs</literal>.
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<programlisting>
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nativeBuildInputs = [ breakpointHook ];
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</programlisting>
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When a build failure happens there will be an instruction printed that
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shows how to attach with <literal>cntr</literal> to the build sandbox.
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</para>
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</listitem>
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</varlistentry>
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