nixpkgs/nixos/doc/manual/default.nix
pennae 81cf173256 nixos-render-docs: use multiprocessing for options
options processing is pretty slow right now, mostly because the
markdown-it-py parser is pure python (and with performance
pessimizations at that). options parsing *is* embarassingly parallel
though, so we can just fork out all the work to worker processes and
collect the results.

multiprocessing probably has a greater benefit on linux than on darwin
since the worker spawning method darwin uses is less efficient than
fork() on linux. this hasn't been tested on darwin, only on linux, but
if anything darwin will be faster with its preferred method.
2023-02-18 13:17:57 +01:00

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{ pkgs
, options
, config
, version
, revision
, extraSources ? []
, baseOptionsJSON ? null
, warningsAreErrors ? true
, allowDocBook ? true
, prefix ? ../../..
}:
with pkgs;
let
inherit (lib) hasPrefix removePrefix;
lib = pkgs.lib;
docbook_xsl_ns = pkgs.docbook-xsl-ns.override {
withManOptDedupPatch = true;
};
manpageUrls = pkgs.path + "/doc/manpage-urls.json";
# We need to strip references to /nix/store/* from options,
# including any `extraSources` if some modules came from elsewhere,
# or else the build will fail.
#
# E.g. if some `options` came from modules in ${pkgs.customModules}/nix,
# you'd need to include `extraSources = [ pkgs.customModules ]`
prefixesToStrip = map (p: "${toString p}/") ([ prefix ] ++ extraSources);
stripAnyPrefixes = lib.flip (lib.foldr lib.removePrefix) prefixesToStrip;
optionsDoc = buildPackages.nixosOptionsDoc {
inherit options revision baseOptionsJSON warningsAreErrors allowDocBook;
transformOptions = opt: opt // {
# Clean up declaration sites to not refer to the NixOS source tree.
declarations = map stripAnyPrefixes opt.declarations;
};
};
nixos-lib = import ../../lib { };
testOptionsDoc = let
eval = nixos-lib.evalTest {
# Avoid evaluating a NixOS config prototype.
config.node.type = lib.types.deferredModule;
options._module.args = lib.mkOption { internal = true; };
};
in buildPackages.nixosOptionsDoc {
inherit (eval) options;
inherit revision;
transformOptions = opt: opt // {
# Clean up declaration sites to not refer to the NixOS source tree.
declarations =
map
(decl:
if hasPrefix (toString ../../..) (toString decl)
then
let subpath = removePrefix "/" (removePrefix (toString ../../..) (toString decl));
in { url = "https://github.com/NixOS/nixpkgs/blob/master/${subpath}"; name = subpath; }
else decl)
opt.declarations;
};
documentType = "none";
variablelistId = "test-options-list";
optionIdPrefix = "test-opt-";
};
toc = builtins.toFile "toc.xml"
''
<toc role="chunk-toc">
<d:tocentry xmlns:d="http://docbook.org/ns/docbook" linkend="book-nixos-manual"><?dbhtml filename="index.html"?>
<d:tocentry linkend="ch-options"><?dbhtml filename="options.html"?></d:tocentry>
<d:tocentry linkend="ch-release-notes"><?dbhtml filename="release-notes.html"?></d:tocentry>
</d:tocentry>
</toc>
'';
manualXsltprocOptions = toString [
"--param chapter.autolabel 0"
"--param part.autolabel 0"
"--param preface.autolabel 0"
"--param reference.autolabel 0"
"--param section.autolabel 0"
"--stringparam html.stylesheet 'style.css overrides.css highlightjs/mono-blue.css'"
"--stringparam html.script './highlightjs/highlight.pack.js ./highlightjs/loader.js'"
"--param xref.with.number.and.title 0"
"--param toc.section.depth 0"
"--param generate.consistent.ids 1"
"--stringparam admon.style ''"
"--stringparam callout.graphics.extension .svg"
"--stringparam current.docid manual"
"--param chunk.section.depth 0"
"--param chunk.first.sections 1"
"--param use.id.as.filename 1"
"--stringparam chunk.toc ${toc}"
];
linterFunctions = ''
# outputs the context of an xmllint error output
# LEN lines around the failing line are printed
function context {
# length of context
local LEN=6
# lines to print before error line
local BEFORE=4
# xmllint output lines are:
# file.xml:1234: there was an error on line 1234
while IFS=':' read -r file line rest; do
echo
if [[ -n "$rest" ]]; then
echo "$file:$line:$rest"
local FROM=$(($line>$BEFORE ? $line - $BEFORE : 1))
# number lines & filter context
nl --body-numbering=a "$file" | sed -n "$FROM,+$LEN p"
else
if [[ -n "$line" ]]; then
echo "$file:$line"
else
echo "$file"
fi
fi
done
}
function lintrng {
xmllint --debug --noout --nonet \
--relaxng ${docbook5}/xml/rng/docbook/docbook.rng \
"$1" \
2>&1 | context 1>&2
# ^ redirect assumes xmllint doesnt print to stdout
}
'';
manual-combined = runCommand "nixos-manual-combined"
{ inputs = lib.sourceFilesBySuffices ./. [ ".xml" ".md" ];
nativeBuildInputs = [ pkgs.nixos-render-docs pkgs.libxml2.bin pkgs.libxslt.bin ];
meta.description = "The NixOS manual as plain docbook XML";
}
''
cp -r --no-preserve=all $inputs/* .
substituteInPlace ./manual.md \
--replace '@NIXOS_VERSION@' "${version}"
substituteInPlace ./configuration/configuration.md \
--replace \
'@MODULE_CHAPTERS@' \
${lib.escapeShellArg (lib.concatMapStringsSep "\n" (p: "${p.value}") config.meta.doc)}
substituteInPlace ./nixos-options.md \
--replace \
'@NIXOS_OPTIONS_JSON@' \
${optionsDoc.optionsJSON}/share/doc/nixos/options.json
substituteInPlace ./development/writing-nixos-tests.section.md \
--replace \
'@NIXOS_TEST_OPTIONS_JSON@' \
${testOptionsDoc.optionsJSON}/share/doc/nixos/options.json
nixos-render-docs -j $NIX_BUILD_CORES manual docbook \
--manpage-urls ${manpageUrls} \
--revision ${lib.escapeShellArg revision} \
./manual.md \
./manual-combined.xml
${linterFunctions}
mkdir $out
cp manual-combined.xml $out/
lintrng $out/manual-combined.xml
'';
manpages-combined = runCommand "nixos-manpages-combined.xml"
{ nativeBuildInputs = [ buildPackages.libxml2.bin buildPackages.libxslt.bin ];
meta.description = "The NixOS manpages as plain docbook XML";
}
''
mkdir generated
cp -prd ${./man-pages.xml} man-pages.xml
ln -s ${optionsDoc.optionsDocBook} generated/options-db.xml
xmllint --xinclude --noxincludenode --output $out ./man-pages.xml
${linterFunctions}
lintrng $out
'';
in rec {
inherit (optionsDoc) optionsJSON optionsNix optionsDocBook optionsUsedDocbook;
# Generate the NixOS manual.
manualHTML = runCommand "nixos-manual-html"
{ nativeBuildInputs = [ buildPackages.libxml2.bin buildPackages.libxslt.bin ];
meta.description = "The NixOS manual in HTML format";
allowedReferences = ["out"];
}
''
# Generate the HTML manual.
dst=$out/share/doc/nixos
mkdir -p $dst
xsltproc \
${manualXsltprocOptions} \
--stringparam id.warnings "1" \
--nonet --output $dst/ \
${docbook_xsl_ns}/xml/xsl/docbook/xhtml/chunktoc.xsl \
${manual-combined}/manual-combined.xml \
|& tee xsltproc.out
grep "^ID recommended on" xsltproc.out &>/dev/null && echo "error: some IDs are missing" && false
rm xsltproc.out
mkdir -p $dst/images/callouts
cp ${docbook_xsl_ns}/xml/xsl/docbook/images/callouts/*.svg $dst/images/callouts/
cp ${../../../doc/style.css} $dst/style.css
cp ${../../../doc/overrides.css} $dst/overrides.css
cp -r ${pkgs.documentation-highlighter} $dst/highlightjs
mkdir -p $out/nix-support
echo "nix-build out $out" >> $out/nix-support/hydra-build-products
echo "doc manual $dst" >> $out/nix-support/hydra-build-products
''; # */
# Alias for backward compatibility. TODO(@oxij): remove eventually.
manual = manualHTML;
# Index page of the NixOS manual.
manualHTMLIndex = "${manualHTML}/share/doc/nixos/index.html";
manualEpub = runCommand "nixos-manual-epub"
{ nativeBuildInputs = [ buildPackages.libxml2.bin buildPackages.libxslt.bin buildPackages.zip ];
}
''
# Generate the epub manual.
dst=$out/share/doc/nixos
xsltproc \
${manualXsltprocOptions} \
--nonet --xinclude --output $dst/epub/ \
${docbook_xsl_ns}/xml/xsl/docbook/epub/docbook.xsl \
${manual-combined}/manual-combined.xml
mkdir -p $dst/epub/OEBPS/images/callouts
cp -r ${docbook_xsl_ns}/xml/xsl/docbook/images/callouts/*.svg $dst/epub/OEBPS/images/callouts # */
echo "application/epub+zip" > mimetype
manual="$dst/nixos-manual.epub"
zip -0Xq "$manual" mimetype
cd $dst/epub && zip -Xr9D "$manual" *
rm -rf $dst/epub
mkdir -p $out/nix-support
echo "doc-epub manual $manual" >> $out/nix-support/hydra-build-products
'';
# Generate the NixOS manpages.
manpages = runCommand "nixos-manpages"
{ nativeBuildInputs = [
buildPackages.installShellFiles
] ++ lib.optionals allowDocBook [
buildPackages.libxml2.bin
buildPackages.libxslt.bin
] ++ lib.optionals (! allowDocBook) [
buildPackages.nixos-render-docs
];
allowedReferences = ["out"];
}
''
# Generate manpages.
mkdir -p $out/share/man/man8
installManPage ${./manpages}/*
${if allowDocBook
then ''
xsltproc --nonet \
--maxdepth 6000 \
--param man.output.in.separate.dir 1 \
--param man.output.base.dir "'$out/share/man/'" \
--param man.endnotes.are.numbered 0 \
--param man.break.after.slash 1 \
${docbook_xsl_ns}/xml/xsl/docbook/manpages/docbook.xsl \
${manpages-combined}
''
else ''
mkdir -p $out/share/man/man5
nixos-render-docs -j $NIX_BUILD_CORES options manpage \
--revision ${lib.escapeShellArg revision} \
${optionsJSON}/share/doc/nixos/options.json \
$out/share/man/man5/configuration.nix.5
''}
'';
}