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Diffstat (limited to 'third_party/nix/doc/manual/advanced-topics/post-build-hook.xml')
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diff --git a/third_party/nix/doc/manual/advanced-topics/post-build-hook.xml b/third_party/nix/doc/manual/advanced-topics/post-build-hook.xml deleted file mode 100644 index 3dc43ee795b1..000000000000 --- a/third_party/nix/doc/manual/advanced-topics/post-build-hook.xml +++ /dev/null @@ -1,160 +0,0 @@ -<chapter xmlns="http://docbook.org/ns/docbook" - xmlns:xlink="http://www.w3.org/1999/xlink" - xmlns:xi="http://www.w3.org/2001/XInclude" - xml:id="chap-post-build-hook" - version="5.0" - > - -<title>Using the <xref linkend="conf-post-build-hook" /></title> -<subtitle>Uploading to an S3-compatible binary cache after each build</subtitle> - - -<section xml:id="chap-post-build-hook-caveats"> - <title>Implementation Caveats</title> - <para>Here we use the post-build hook to upload to a binary cache. - This is a simple and working example, but it is not suitable for all - use cases.</para> - - <para>The post build hook program runs after each executed build, - and blocks the build loop. The build loop exits if the hook program - fails.</para> - - <para>Concretely, this implementation will make Nix slow or unusable - when the internet is slow or unreliable.</para> - - <para>A more advanced implementation might pass the store paths to a - user-supplied daemon or queue for processing the store paths outside - of the build loop.</para> -</section> - -<section> - <title>Prerequisites</title> - - <para> - This tutorial assumes you have configured an S3-compatible binary cache - according to the instructions at - <xref linkend="ssec-s3-substituter-authenticated-writes" />, and - that the <literal>root</literal> user's default AWS profile can - upload to the bucket. - </para> -</section> - -<section> - <title>Set up a Signing Key</title> - <para>Use <command>nix-store --generate-binary-cache-key</command> to - create our public and private signing keys. We will sign paths - with the private key, and distribute the public key for verifying - the authenticity of the paths.</para> - - <screen> -# nix-store --generate-binary-cache-key example-nix-cache-1 /etc/nix/key.private /etc/nix/key.public -# cat /etc/nix/key.public -example-nix-cache-1:1/cKDz3QCCOmwcztD2eV6Coggp6rqc9DGjWv7C0G+rM= -</screen> - -<para>Then, add the public key and the cache URL to your -<filename>nix.conf</filename>'s <xref linkend="conf-trusted-public-keys" /> -and <xref linkend="conf-substituters" /> like:</para> - -<programlisting> -substituters = https://cache.nixos.org/ s3://example-nix-cache -trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= example-nix-cache-1:1/cKDz3QCCOmwcztD2eV6Coggp6rqc9DGjWv7C0G+rM= -</programlisting> - -<para>we will restart the Nix daemon a later step.</para> -</section> - -<section> - <title>Implementing the build hook</title> - <para>Write the following script to - <filename>/etc/nix/upload-to-cache.sh</filename>: - </para> - - <programlisting> -#!/bin/sh - -set -eu -set -f # disable globbing -export IFS=' ' - -echo "Signing paths" $OUT_PATHS -nix sign-paths --key-file /etc/nix/key.private $OUT_PATHS -echo "Uploading paths" $OUT_PATHS -exec nix copy --to 's3://example-nix-cache' $OUT_PATHS -</programlisting> - - <note> - <title>Should <literal>$OUT_PATHS</literal> be quoted?</title> - <para> - The <literal>$OUT_PATHS</literal> variable is a space-separated - list of Nix store paths. In this case, we expect and want the - shell to perform word splitting to make each output path its - own argument to <command>nix sign-paths</command>. Nix guarantees - the paths will not contain any spaces, however a store path - might contain glob characters. The <command>set -f</command> - disables globbing in the shell. - </para> - </note> - <para> - Then make sure the hook program is executable by the <literal>root</literal> user: - <screen> -# chmod +x /etc/nix/upload-to-cache.sh -</screen></para> -</section> - -<section> - <title>Updating Nix Configuration</title> - - <para>Edit <filename>/etc/nix/nix.conf</filename> to run our hook, - by adding the following configuration snippet at the end:</para> - - <programlisting> -post-build-hook = /etc/nix/upload-to-cache.sh -</programlisting> - -<para>Then, restart the <command>nix-daemon</command>.</para> -</section> - -<section> - <title>Testing</title> - - <para>Build any derivation, for example:</para> - - <screen> -$ nix-build -E '(import <nixpkgs> {}).writeText "example" (builtins.toString builtins.currentTime)' -these derivations will be built: - /nix/store/s4pnfbkalzy5qz57qs6yybna8wylkig6-example.drv -building '/nix/store/s4pnfbkalzy5qz57qs6yybna8wylkig6-example.drv'... -running post-build-hook '/home/grahamc/projects/github.com/NixOS/nix/post-hook.sh'... -post-build-hook: Signing paths /nix/store/ibcyipq5gf91838ldx40mjsp0b8w9n18-example -post-build-hook: Uploading paths /nix/store/ibcyipq5gf91838ldx40mjsp0b8w9n18-example -/nix/store/ibcyipq5gf91838ldx40mjsp0b8w9n18-example -</screen> - - <para>Then delete the path from the store, and try substituting it from the binary cache:</para> - <screen> -$ rm ./result -$ nix-store --delete /nix/store/ibcyipq5gf91838ldx40mjsp0b8w9n18-example -</screen> - -<para>Now, copy the path back from the cache:</para> -<screen> -$ nix store --realize /nix/store/ibcyipq5gf91838ldx40mjsp0b8w9n18-example -copying path '/nix/store/m8bmqwrch6l3h8s0k3d673xpmipcdpsa-example from 's3://example-nix-cache'... -warning: you did not specify '--add-root'; the result might be removed by the garbage collector -/nix/store/m8bmqwrch6l3h8s0k3d673xpmipcdpsa-example -</screen> -</section> -<section> - <title>Conclusion</title> - <para> - We now have a Nix installation configured to automatically sign and - upload every local build to a remote binary cache. - </para> - - <para> - Before deploying this to production, be sure to consider the - implementation caveats in <xref linkend="chap-post-build-hook-caveats" />. - </para> -</section> -</chapter> |