fc614c37c6
most modules can be evaluated for their documentation in a very restricted environment that doesn't include all of nixpkgs. this evaluation can then be cached and reused for subsequent builds, merging only documentation that has changed into the cached set. since nixos ships with a large number of modules of which only a few are used in any given config this can save evaluation a huge percentage of nixos options available in any given config. in tests of this caching, despite having to copy most of nixos/, saves about 80% of the time needed to build the system manual, or about two second on the machine used for testing. build time for a full system config shrank from 9.4s to 7.4s, while turning documentation off entirely shortened the build to 7.1s.
256 lines
8.4 KiB
Nix
256 lines
8.4 KiB
Nix
{ pkgs, options, config, version, revision, extraSources ? [], baseOptionsJSON ? null, prefix ? ../../.. }:
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with pkgs;
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let
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lib = pkgs.lib;
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# We need to strip references to /nix/store/* from options,
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# including any `extraSources` if some modules came from elsewhere,
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# or else the build will fail.
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#
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# E.g. if some `options` came from modules in ${pkgs.customModules}/nix,
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# you'd need to include `extraSources = [ pkgs.customModules ]`
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prefixesToStrip = map (p: "${toString p}/") ([ prefix ] ++ extraSources);
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stripAnyPrefixes = lib.flip (lib.foldr lib.removePrefix) prefixesToStrip;
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optionsDoc = buildPackages.nixosOptionsDoc {
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inherit options revision baseOptionsJSON;
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transformOptions = opt: opt // {
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# Clean up declaration sites to not refer to the NixOS source tree.
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declarations = map stripAnyPrefixes opt.declarations;
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};
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};
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sources = lib.sourceFilesBySuffices ./. [".xml"];
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modulesDoc = builtins.toFile "modules.xml" ''
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<section xmlns:xi="http://www.w3.org/2001/XInclude" id="modules">
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${(lib.concatMapStrings (path: ''
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<xi:include href="${path}" />
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'') (lib.catAttrs "value" config.meta.doc))}
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</section>
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'';
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generatedSources = runCommand "generated-docbook" {} ''
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mkdir $out
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ln -s ${modulesDoc} $out/modules.xml
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ln -s ${optionsDoc.optionsDocBook} $out/options-db.xml
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printf "%s" "${version}" > $out/version
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'';
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copySources =
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''
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cp -prd $sources/* . # */
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ln -s ${generatedSources} ./generated
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chmod -R u+w .
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'';
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toc = builtins.toFile "toc.xml"
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''
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<toc role="chunk-toc">
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<d:tocentry xmlns:d="http://docbook.org/ns/docbook" linkend="book-nixos-manual"><?dbhtml filename="index.html"?>
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<d:tocentry linkend="ch-options"><?dbhtml filename="options.html"?></d:tocentry>
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<d:tocentry linkend="ch-release-notes"><?dbhtml filename="release-notes.html"?></d:tocentry>
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</d:tocentry>
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</toc>
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'';
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manualXsltprocOptions = toString [
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"--param section.autolabel 1"
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"--param section.label.includes.component.label 1"
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"--stringparam html.stylesheet 'style.css overrides.css highlightjs/mono-blue.css'"
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"--stringparam html.script './highlightjs/highlight.pack.js ./highlightjs/loader.js'"
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"--param xref.with.number.and.title 1"
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"--param toc.section.depth 0"
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"--param generate.consistent.ids 1"
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"--stringparam admon.style ''"
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"--stringparam callout.graphics.extension .svg"
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"--stringparam current.docid manual"
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"--param chunk.section.depth 0"
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"--param chunk.first.sections 1"
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"--param use.id.as.filename 1"
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"--stringparam chunk.toc ${toc}"
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];
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manual-combined = runCommand "nixos-manual-combined"
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{ inherit sources;
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nativeBuildInputs = [ buildPackages.libxml2.bin buildPackages.libxslt.bin ];
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meta.description = "The NixOS manual as plain docbook XML";
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}
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''
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${copySources}
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xmllint --xinclude --output ./manual-combined.xml ./manual.xml
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xmllint --xinclude --noxincludenode \
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--output ./man-pages-combined.xml ./man-pages.xml
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# outputs the context of an xmllint error output
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# LEN lines around the failing line are printed
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function context {
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# length of context
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local LEN=6
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# lines to print before error line
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local BEFORE=4
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# xmllint output lines are:
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# file.xml:1234: there was an error on line 1234
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while IFS=':' read -r file line rest; do
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echo
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if [[ -n "$rest" ]]; then
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echo "$file:$line:$rest"
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local FROM=$(($line>$BEFORE ? $line - $BEFORE : 1))
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# number lines & filter context
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nl --body-numbering=a "$file" | sed -n "$FROM,+$LEN p"
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else
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if [[ -n "$line" ]]; then
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echo "$file:$line"
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else
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echo "$file"
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fi
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fi
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done
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}
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function lintrng {
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xmllint --debug --noout --nonet \
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--relaxng ${docbook5}/xml/rng/docbook/docbook.rng \
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"$1" \
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2>&1 | context 1>&2
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# ^ redirect assumes xmllint doesn’t print to stdout
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}
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lintrng manual-combined.xml
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lintrng man-pages-combined.xml
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mkdir $out
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cp manual-combined.xml $out/
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cp man-pages-combined.xml $out/
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'';
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olinkDB = runCommand "manual-olinkdb"
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{ inherit sources;
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nativeBuildInputs = [ buildPackages.libxml2.bin buildPackages.libxslt.bin ];
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}
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''
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xsltproc \
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${manualXsltprocOptions} \
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--stringparam collect.xref.targets only \
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--stringparam targets.filename "$out/manual.db" \
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--nonet \
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${docbook_xsl_ns}/xml/xsl/docbook/xhtml/chunktoc.xsl \
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${manual-combined}/manual-combined.xml
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cat > "$out/olinkdb.xml" <<EOF
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE targetset SYSTEM
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"file://${docbook_xsl_ns}/xml/xsl/docbook/common/targetdatabase.dtd" [
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<!ENTITY manualtargets SYSTEM "file://$out/manual.db">
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]>
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<targetset>
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<targetsetinfo>
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Allows for cross-referencing olinks between the manpages
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and manual.
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</targetsetinfo>
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<document targetdoc="manual">&manualtargets;</document>
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</targetset>
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EOF
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'';
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in rec {
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inherit generatedSources;
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inherit (optionsDoc) optionsJSON optionsNix optionsDocBook;
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# Generate the NixOS manual.
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manualHTML = runCommand "nixos-manual-html"
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{ inherit sources;
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nativeBuildInputs = [ buildPackages.libxml2.bin buildPackages.libxslt.bin ];
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meta.description = "The NixOS manual in HTML format";
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allowedReferences = ["out"];
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}
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''
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# Generate the HTML manual.
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dst=$out/share/doc/nixos
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mkdir -p $dst
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xsltproc \
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${manualXsltprocOptions} \
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--stringparam target.database.document "${olinkDB}/olinkdb.xml" \
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--stringparam id.warnings "1" \
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--nonet --output $dst/ \
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${docbook_xsl_ns}/xml/xsl/docbook/xhtml/chunktoc.xsl \
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${manual-combined}/manual-combined.xml \
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|& tee xsltproc.out
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grep "^ID recommended on" xsltproc.out &>/dev/null && echo "error: some IDs are missing" && false
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rm xsltproc.out
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mkdir -p $dst/images/callouts
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cp ${docbook_xsl_ns}/xml/xsl/docbook/images/callouts/*.svg $dst/images/callouts/
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cp ${../../../doc/style.css} $dst/style.css
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cp ${../../../doc/overrides.css} $dst/overrides.css
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cp -r ${pkgs.documentation-highlighter} $dst/highlightjs
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mkdir -p $out/nix-support
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echo "nix-build out $out" >> $out/nix-support/hydra-build-products
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echo "doc manual $dst" >> $out/nix-support/hydra-build-products
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''; # */
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# Alias for backward compatibility. TODO(@oxij): remove eventually.
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manual = manualHTML;
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# Index page of the NixOS manual.
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manualHTMLIndex = "${manualHTML}/share/doc/nixos/index.html";
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manualEpub = runCommand "nixos-manual-epub"
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{ inherit sources;
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buildInputs = [ libxml2.bin libxslt.bin zip ];
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}
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''
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# Generate the epub manual.
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dst=$out/share/doc/nixos
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xsltproc \
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${manualXsltprocOptions} \
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--stringparam target.database.document "${olinkDB}/olinkdb.xml" \
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--nonet --xinclude --output $dst/epub/ \
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${docbook_xsl_ns}/xml/xsl/docbook/epub/docbook.xsl \
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${manual-combined}/manual-combined.xml
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mkdir -p $dst/epub/OEBPS/images/callouts
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cp -r ${docbook_xsl_ns}/xml/xsl/docbook/images/callouts/*.svg $dst/epub/OEBPS/images/callouts # */
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echo "application/epub+zip" > mimetype
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manual="$dst/nixos-manual.epub"
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zip -0Xq "$manual" mimetype
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cd $dst/epub && zip -Xr9D "$manual" *
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rm -rf $dst/epub
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mkdir -p $out/nix-support
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echo "doc-epub manual $manual" >> $out/nix-support/hydra-build-products
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'';
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# Generate the NixOS manpages.
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manpages = runCommand "nixos-manpages"
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{ inherit sources;
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nativeBuildInputs = [ buildPackages.libxml2.bin buildPackages.libxslt.bin ];
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allowedReferences = ["out"];
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}
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''
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# Generate manpages.
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mkdir -p $out/share/man
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xsltproc --nonet \
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--maxdepth 6000 \
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--param man.output.in.separate.dir 1 \
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--param man.output.base.dir "'$out/share/man/'" \
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--param man.endnotes.are.numbered 0 \
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--param man.break.after.slash 1 \
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--stringparam target.database.document "${olinkDB}/olinkdb.xml" \
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${docbook_xsl_ns}/xml/xsl/docbook/manpages/docbook.xsl \
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${manual-combined}/man-pages-combined.xml
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'';
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}
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