nixpkgs/nixos/modules/misc/documentation.nix
Eelco Dolstra 2e860868fe nixos/modules/misc/documentation.nix: Don't use toString on a path
It gives a warning on the lazy-trees branch of Nix
(https://github.com/NixOS/nix/pull/6530) and should generally be
avoided because it causes an unnecessary copy to the store.
2022-10-28 17:05:03 +02:00

363 lines
12 KiB
Nix

{ config, options, lib, pkgs, utils, modules, baseModules, extraModules, modulesPath, specialArgs, ... }:
with lib;
let
cfg = config.documentation;
allOpts = options;
canCacheDocs = m:
let
f = import m;
instance = f (mapAttrs (n: _: abort "evaluating ${n} for `meta` failed") (functionArgs f));
in
cfg.nixos.options.splitBuild
&& builtins.isPath m
&& isFunction f
&& instance ? options
&& instance.meta.buildDocsInSandbox or true;
docModules =
let
p = partition canCacheDocs (baseModules ++ cfg.nixos.extraModules);
in
{
lazy = p.right;
eager = p.wrong ++ optionals cfg.nixos.includeAllModules (extraModules ++ modules);
};
manual = import ../../doc/manual rec {
inherit pkgs config;
version = config.system.nixos.release;
revision = "release-${version}";
extraSources = cfg.nixos.extraModuleSources;
options =
let
scrubbedEval = evalModules {
modules = [ {
_module.check = false;
} ] ++ docModules.eager;
specialArgs = specialArgs // {
pkgs = scrubDerivations "pkgs" pkgs;
# allow access to arbitrary options for eager modules, eg for getting
# option types from lazy modules
options = allOpts;
inherit modulesPath utils;
};
};
scrubDerivations = namePrefix: pkgSet: mapAttrs
(name: value:
let wholeName = "${namePrefix}.${name}"; in
if isAttrs value then
scrubDerivations wholeName value
// (optionalAttrs (isDerivation value) { outPath = "\${${wholeName}}"; })
else value
)
pkgSet;
in scrubbedEval.options;
baseOptionsJSON =
let
filter =
builtins.filterSource
(n: t:
cleanSourceFilter n t
&& (t == "directory" -> baseNameOf n != "tests")
&& (t == "file" -> hasSuffix ".nix" n)
);
in
pkgs.runCommand "lazy-options.json" {
libPath = filter (pkgs.path + "/lib");
pkgsLibPath = filter (pkgs.path + "/pkgs/pkgs-lib");
nixosPath = filter (pkgs.path + "/nixos");
modules = map (p: ''"${removePrefix "${modulesPath}/" (toString p)}"'') docModules.lazy;
} ''
export NIX_STORE_DIR=$TMPDIR/store
export NIX_STATE_DIR=$TMPDIR/state
${pkgs.buildPackages.nix}/bin/nix-instantiate \
--show-trace \
--eval --json --strict \
--argstr libPath "$libPath" \
--argstr pkgsLibPath "$pkgsLibPath" \
--argstr nixosPath "$nixosPath" \
--arg modules "[ $modules ]" \
--argstr stateVersion "${options.system.stateVersion.default}" \
--argstr release "${config.system.nixos.release}" \
$nixosPath/lib/eval-cacheable-options.nix > $out \
|| {
echo -en "\e[1;31m"
echo 'Cacheable portion of option doc build failed.'
echo 'Usually this means that an option attribute that ends up in documentation (eg' \
'`default` or `description`) depends on the restricted module arguments' \
'`config` or `pkgs`.'
echo
echo 'Rebuild your configuration with `--show-trace` to find the offending' \
'location. Remove the references to restricted arguments (eg by escaping' \
'their antiquotations or adding a `defaultText`) or disable the sandboxed' \
'build for the failing module by setting `meta.buildDocsInSandbox = false`.'
echo -en "\e[0m"
exit 1
} >&2
'';
inherit (cfg.nixos.options) warningsAreErrors allowDocBook;
};
nixos-help = let
helpScript = pkgs.writeShellScriptBin "nixos-help" ''
# Finds first executable browser in a colon-separated list.
# (see how xdg-open defines BROWSER)
browser="$(
IFS=: ; for b in $BROWSER; do
[ -n "$(type -P "$b" || true)" ] && echo "$b" && break
done
)"
if [ -z "$browser" ]; then
browser="$(type -P xdg-open || true)"
if [ -z "$browser" ]; then
browser="${pkgs.w3m-nographics}/bin/w3m"
fi
fi
exec "$browser" ${manual.manualHTMLIndex}
'';
desktopItem = pkgs.makeDesktopItem {
name = "nixos-manual";
desktopName = "NixOS Manual";
genericName = "View NixOS documentation in a web browser";
icon = "nix-snowflake";
exec = "nixos-help";
categories = ["System"];
};
in pkgs.symlinkJoin {
name = "nixos-help";
paths = [
helpScript
desktopItem
];
};
in
{
imports = [
./man-db.nix
./mandoc.nix
./assertions.nix
./meta.nix
../config/system-path.nix
../system/etc/etc.nix
(mkRenamedOptionModule [ "programs" "info" "enable" ] [ "documentation" "info" "enable" ])
(mkRenamedOptionModule [ "programs" "man" "enable" ] [ "documentation" "man" "enable" ])
(mkRenamedOptionModule [ "services" "nixosManual" "enable" ] [ "documentation" "nixos" "enable" ])
];
options = {
documentation = {
enable = mkOption {
type = types.bool;
default = true;
description = lib.mdDoc ''
Whether to install documentation of packages from
{option}`environment.systemPackages` into the generated system path.
See "Multiple-output packages" chapter in the nixpkgs manual for more info.
'';
# which is at ../../../doc/multiple-output.chapter.md
};
man.enable = mkOption {
type = types.bool;
default = true;
description = lib.mdDoc ''
Whether to install manual pages.
This also includes `man` outputs.
'';
};
man.generateCaches = mkOption {
type = types.bool;
default = false;
description = mdDoc ''
Whether to generate the manual page index caches.
This allows searching for a page or
keyword using utilities like {manpage}`apropos(1)`
and the `-k` option of
{manpage}`man(1)`.
'';
};
info.enable = mkOption {
type = types.bool;
default = true;
description = lib.mdDoc ''
Whether to install info pages and the {command}`info` command.
This also includes "info" outputs.
'';
};
doc.enable = mkOption {
type = types.bool;
default = true;
description = lib.mdDoc ''
Whether to install documentation distributed in packages' `/share/doc`.
Usually plain text and/or HTML.
This also includes "doc" outputs.
'';
};
dev.enable = mkOption {
type = types.bool;
default = false;
description = mdDoc ''
Whether to install documentation targeted at developers.
* This includes man pages targeted at developers if {option}`documentation.man.enable` is
set (this also includes "devman" outputs).
* This includes info pages targeted at developers if {option}`documentation.info.enable`
is set (this also includes "devinfo" outputs).
* This includes other pages targeted at developers if {option}`documentation.doc.enable`
is set (this also includes "devdoc" outputs).
'';
};
nixos.enable = mkOption {
type = types.bool;
default = true;
description = lib.mdDoc ''
Whether to install NixOS's own documentation.
- This includes man pages like
{manpage}`configuration.nix(5)` if {option}`documentation.man.enable` is
set.
- This includes the HTML manual and the {command}`nixos-help` command if
{option}`documentation.doc.enable` is set.
'';
};
nixos.extraModules = mkOption {
type = types.listOf types.raw;
default = [];
description = lib.mdDoc ''
Modules for which to show options even when not imported.
'';
};
nixos.options.splitBuild = mkOption {
type = types.bool;
default = true;
description = lib.mdDoc ''
Whether to split the option docs build into a cacheable and an uncacheable part.
Splitting the build can substantially decrease the amount of time needed to build
the manual, but some user modules may be incompatible with this splitting.
'';
};
nixos.options.allowDocBook = mkOption {
type = types.bool;
default = true;
description = lib.mdDoc ''
Whether to allow DocBook option docs. When set to `false` all option using
DocBook documentation will cause a manual build error; additionally a new
renderer may be used.
::: {.note}
The `false` setting for this option is not yet fully supported. While it
should work fine and produce the same output as the previous toolchain
using DocBook it may not work in all circumstances. Whether markdown option
documentation is allowed is independent of this option.
:::
'';
};
nixos.options.warningsAreErrors = mkOption {
type = types.bool;
default = true;
description = lib.mdDoc ''
Treat warning emitted during the option documentation build (eg for missing option
descriptions) as errors.
'';
};
nixos.includeAllModules = mkOption {
type = types.bool;
default = false;
description = lib.mdDoc ''
Whether the generated NixOS's documentation should include documentation for all
the options from all the NixOS modules included in the current
`configuration.nix`. Disabling this will make the manual
generator to ignore options defined outside of `baseModules`.
'';
};
nixos.extraModuleSources = mkOption {
type = types.listOf (types.either types.path types.str);
default = [ ];
description = lib.mdDoc ''
Which extra NixOS module paths the generated NixOS's documentation should strip
from options.
'';
example = literalExpression ''
# e.g. with options from modules in ''${pkgs.customModules}/nix:
[ pkgs.customModules ]
'';
};
};
};
config = mkIf cfg.enable (mkMerge [
{
assertions = [
{
assertion = !(cfg.man.man-db.enable && cfg.man.mandoc.enable);
message = ''
man-db and mandoc can't be used as the default man page viewer at the same time!
'';
}
];
}
# The actual implementation for this lives in man-db.nix or mandoc.nix,
# depending on which backend is active.
(mkIf cfg.man.enable {
environment.pathsToLink = [ "/share/man" ];
environment.extraOutputsToInstall = [ "man" ] ++ optional cfg.dev.enable "devman";
})
(mkIf cfg.info.enable {
environment.systemPackages = [ pkgs.texinfoInteractive ];
environment.pathsToLink = [ "/share/info" ];
environment.extraOutputsToInstall = [ "info" ] ++ optional cfg.dev.enable "devinfo";
environment.extraSetup = ''
if [ -w $out/share/info ]; then
shopt -s nullglob
for i in $out/share/info/*.info $out/share/info/*.info.gz; do
${pkgs.buildPackages.texinfo}/bin/install-info $i $out/share/info/dir
done
fi
'';
})
(mkIf cfg.doc.enable {
environment.pathsToLink = [ "/share/doc" ];
environment.extraOutputsToInstall = [ "doc" ] ++ optional cfg.dev.enable "devdoc";
})
(mkIf cfg.nixos.enable {
system.build.manual = manual;
environment.systemPackages = []
++ optional cfg.man.enable manual.manpages
++ optionals cfg.doc.enable [ manual.manualHTML nixos-help ];
})
]);
}