414 lines
15 KiB
Nix
414 lines
15 KiB
Nix
{ config, options, lib, pkgs, utils, modules, baseModules, extraModules, modulesPath, ... }:
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with lib;
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let
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cfg = config.documentation;
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allOpts = options;
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/* Modules for which to show options even when not imported. */
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extraDocModules = [ ../virtualisation/qemu-vm.nix ];
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canCacheDocs = m:
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let
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f = import m;
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instance = f (mapAttrs (n: _: abort "evaluating ${n} for `meta` failed") (functionArgs f));
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in
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cfg.nixos.options.splitBuild
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&& builtins.isPath m
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&& isFunction f
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&& instance ? options
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&& instance.meta.buildDocsInSandbox or true;
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docModules =
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let
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p = partition canCacheDocs (baseModules ++ extraDocModules);
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in
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{
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lazy = p.right;
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eager = p.wrong ++ optionals cfg.nixos.includeAllModules (extraModules ++ modules);
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};
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manual = import ../../doc/manual rec {
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inherit pkgs config;
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version = config.system.nixos.release;
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revision = "release-${version}";
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extraSources = cfg.nixos.extraModuleSources;
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options =
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let
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scrubbedEval = evalModules {
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modules = [ {
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_module.check = false;
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} ] ++ docModules.eager;
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specialArgs = {
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pkgs = scrubDerivations "pkgs" pkgs;
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# allow access to arbitrary options for eager modules, eg for getting
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# option types from lazy modules
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options = allOpts;
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inherit modulesPath utils;
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};
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};
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scrubDerivations = namePrefix: pkgSet: mapAttrs
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(name: value:
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let wholeName = "${namePrefix}.${name}"; in
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if isAttrs value then
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scrubDerivations wholeName value
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// (optionalAttrs (isDerivation value) { outPath = "\${${wholeName}}"; })
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else value
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)
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pkgSet;
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in scrubbedEval.options;
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baseOptionsJSON =
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let
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filterIntoStore =
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builtins.filterSource
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(n: t:
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(t == "directory" -> baseNameOf n != "tests")
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&& (t == "file" -> hasSuffix ".nix" n)
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);
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# Figure out if Nix runs in pure evaluation mode. May return true in
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# impure mode, but this is highly unlikely.
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# We need to know because of https://github.com/NixOS/nix/issues/1888
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# and https://github.com/NixOS/nix/issues/5868
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isPureEval = builtins.getEnv "PATH" == "" && builtins.getEnv "_" == "";
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# Return a nixpkgs subpath with minimal copying.
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#
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# The sources for the base options json derivation can come in one of
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# two forms:
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# - single source: a store path with all of nixpkgs, postfix with
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# subpaths to access various directories. This has the benefit of
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# not creating copies of these subtrees in the Nix store, but
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# can cause unnecessary rebuilds if you update the Nixpkgs `pkgs`
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# tree often.
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# - split sources: multiple store paths with subdirectories of
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# nixpkgs that exclude the bulk of the pkgs directory.
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# This requires more copying and hashing during evaluation but
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# requires fewer files to be copied. This method produces fewer
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# unnecessary rebuilds of the base options json.
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#
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# Flake
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#
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# Flakes always put a copy of the full nixpkgs sources in the store,
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# so we can use the "single source" method. This method is ideal
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# for using nixpkgs as a dependency, as the base options json will be
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# substitutable from cache.nixos.org.
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#
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# This requires that the `self.outPath` is wired into `pkgs` correctly,
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# which is done for you if `pkgs` comes from the `lib.nixosSystem` or
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# `legacyPackages` flake attributes.
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#
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# Other Nixpkgs invocation
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#
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# If you do not use the known-correct flake attributes, but rather
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# invoke Nixpkgs yourself, set `config.path` to the correct path value,
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# e.g. `import nixpkgs { config.path = nixpkgs; }`.
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#
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# Choosing between single or split source paths
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#
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# We make assumptions based on the type and contents of `pkgs.path`.
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# By passing a different `config.path` to Nixpkgs, you can influence
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# how your documentation cache is evaluated and rebuilt.
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#
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# Single source
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# - If pkgs.path is a string containing a store path, the code has no
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# choice but to create this store path, if it hasn't already been.
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# We assume that the "single source" method is most efficient.
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# - If pkgs.path is a path value containing that is a store path,
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# we try to convert it to a string with context without copying.
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# This occurs for example when nixpkgs was fetched and using its
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# default `config.path`, which is `./.`.
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# Nix currently does not allow this conversion when evaluating in
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# pure mode. If the conversion is not possible, we use the
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# "split source" method.
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#
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# Split source
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# - If pkgs.path is a path value that is not a store path, we assume
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# that it's unlikely for all of nixpkgs to end up in the store for
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# other reasons and try to keep both the copying and rebuilds low.
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pull =
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if builtins.typeOf pkgs.path == "string" && isStorePath pkgs.path then
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dir: "${pkgs.path}/${dir}"
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else if !isPureEval && isStorePath pkgs.path then
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dir: "${builtins.storePath pkgs.path}/${dir}"
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else
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dir: filterIntoStore "${toString pkgs.path}/${dir}";
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in
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pkgs.runCommand "lazy-options.json" {
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libPath = pull "lib";
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pkgsLibPath = pull "pkgs/pkgs-lib";
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nixosPath = pull "nixos";
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modules = map (p: ''"${removePrefix "${modulesPath}/" (toString p)}"'') docModules.lazy;
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} ''
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export NIX_STORE_DIR=$TMPDIR/store
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export NIX_STATE_DIR=$TMPDIR/state
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${pkgs.buildPackages.nix}/bin/nix-instantiate \
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--show-trace \
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--eval --json --strict \
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--argstr libPath "$libPath" \
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--argstr pkgsLibPath "$pkgsLibPath" \
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--argstr nixosPath "$nixosPath" \
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--arg modules "[ $modules ]" \
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--argstr stateVersion "${options.system.stateVersion.default}" \
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--argstr release "${config.system.nixos.release}" \
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$nixosPath/lib/eval-cacheable-options.nix > $out \
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|| {
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echo -en "\e[1;31m"
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echo 'Cacheable portion of option doc build failed.'
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echo 'Usually this means that an option attribute that ends up in documentation (eg' \
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'`default` or `description`) depends on the restricted module arguments' \
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'`config` or `pkgs`.'
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echo
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echo 'Rebuild your configuration with `--show-trace` to find the offending' \
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'location. Remove the references to restricted arguments (eg by escaping' \
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'their antiquotations or adding a `defaultText`) or disable the sandboxed' \
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'build for the failing module by setting `meta.buildDocsInSandbox = false`.'
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echo -en "\e[0m"
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exit 1
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} >&2
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'';
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inherit (cfg.nixos.options) warningsAreErrors;
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};
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nixos-help = let
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helpScript = pkgs.writeShellScriptBin "nixos-help" ''
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# Finds first executable browser in a colon-separated list.
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# (see how xdg-open defines BROWSER)
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browser="$(
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IFS=: ; for b in $BROWSER; do
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[ -n "$(type -P "$b" || true)" ] && echo "$b" && break
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done
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)"
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if [ -z "$browser" ]; then
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browser="$(type -P xdg-open || true)"
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if [ -z "$browser" ]; then
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browser="${pkgs.w3m-nographics}/bin/w3m"
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fi
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fi
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exec "$browser" ${manual.manualHTMLIndex}
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'';
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desktopItem = pkgs.makeDesktopItem {
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name = "nixos-manual";
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desktopName = "NixOS Manual";
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genericName = "View NixOS documentation in a web browser";
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icon = "nix-snowflake";
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exec = "nixos-help";
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categories = "System";
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};
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in pkgs.symlinkJoin {
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name = "nixos-help";
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paths = [
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helpScript
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desktopItem
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];
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};
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in
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{
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imports = [
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(mkRenamedOptionModule [ "programs" "info" "enable" ] [ "documentation" "info" "enable" ])
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(mkRenamedOptionModule [ "programs" "man" "enable" ] [ "documentation" "man" "enable" ])
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(mkRenamedOptionModule [ "services" "nixosManual" "enable" ] [ "documentation" "nixos" "enable" ])
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];
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options = {
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documentation = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to install documentation of packages from
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<option>environment.systemPackages</option> into the generated system path.
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See "Multiple-output packages" chapter in the nixpkgs manual for more info.
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'';
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# which is at ../../../doc/multiple-output.chapter.md
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};
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man.enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to install manual pages.
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This also includes <literal>man</literal> outputs.
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'';
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};
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man.generateCaches = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to generate the manual page index caches.
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This allows searching for a page or
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keyword using utilities like
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<citerefentry>
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<refentrytitle>apropos</refentrytitle>
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<manvolnum>1</manvolnum>
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</citerefentry>
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and the <literal>-k</literal> option of
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<citerefentry>
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<refentrytitle>man</refentrytitle>
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<manvolnum>1</manvolnum>
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</citerefentry>.
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'';
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};
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info.enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to install info pages and the <command>info</command> command.
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This also includes "info" outputs.
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'';
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};
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doc.enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to install documentation distributed in packages' <literal>/share/doc</literal>.
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Usually plain text and/or HTML.
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This also includes "doc" outputs.
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'';
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};
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dev.enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to install documentation targeted at developers.
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<itemizedlist>
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<listitem><para>This includes man pages targeted at developers if <option>documentation.man.enable</option> is
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set (this also includes "devman" outputs).</para></listitem>
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<listitem><para>This includes info pages targeted at developers if <option>documentation.info.enable</option>
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is set (this also includes "devinfo" outputs).</para></listitem>
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<listitem><para>This includes other pages targeted at developers if <option>documentation.doc.enable</option>
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is set (this also includes "devdoc" outputs).</para></listitem>
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</itemizedlist>
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'';
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};
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nixos.enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to install NixOS's own documentation.
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<itemizedlist>
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<listitem><para>This includes man pages like
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<citerefentry><refentrytitle>configuration.nix</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> if <option>documentation.man.enable</option> is
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set.</para></listitem>
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<listitem><para>This includes the HTML manual and the <command>nixos-help</command> command if
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<option>documentation.doc.enable</option> is set.</para></listitem>
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</itemizedlist>
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'';
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};
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nixos.options.splitBuild = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to split the option docs build into a cacheable and an uncacheable part.
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Splitting the build can substantially decrease the amount of time needed to build
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the manual, but some user modules may be incompatible with this splitting.
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'';
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};
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nixos.options.warningsAreErrors = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Treat warning emitted during the option documentation build (eg for missing option
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descriptions) as errors.
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'';
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};
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nixos.includeAllModules = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether the generated NixOS's documentation should include documentation for all
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the options from all the NixOS modules included in the current
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<literal>configuration.nix</literal>. Disabling this will make the manual
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generator to ignore options defined outside of <literal>baseModules</literal>.
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'';
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};
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nixos.extraModuleSources = mkOption {
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type = types.listOf (types.either types.path types.str);
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default = [ ];
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description = ''
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Which extra NixOS module paths the generated NixOS's documentation should strip
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from options.
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'';
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example = literalExpression ''
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# e.g. with options from modules in ''${pkgs.customModules}/nix:
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[ pkgs.customModules ]
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'';
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};
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};
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};
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config = mkIf cfg.enable (mkMerge [
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{
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assertions = [
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{
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assertion = !(cfg.man.man-db.enable && cfg.man.mandoc.enable);
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message = ''
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man-db and mandoc can't be used as the default man page viewer at the same time!
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'';
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}
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];
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}
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# The actual implementation for this lives in man-db.nix or mandoc.nix,
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# depending on which backend is active.
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(mkIf cfg.man.enable {
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environment.pathsToLink = [ "/share/man" ];
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environment.extraOutputsToInstall = [ "man" ] ++ optional cfg.dev.enable "devman";
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})
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(mkIf cfg.info.enable {
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environment.systemPackages = [ pkgs.texinfoInteractive ];
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environment.pathsToLink = [ "/share/info" ];
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environment.extraOutputsToInstall = [ "info" ] ++ optional cfg.dev.enable "devinfo";
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environment.extraSetup = ''
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if [ -w $out/share/info ]; then
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shopt -s nullglob
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for i in $out/share/info/*.info $out/share/info/*.info.gz; do
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${pkgs.buildPackages.texinfo}/bin/install-info $i $out/share/info/dir
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done
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fi
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'';
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})
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(mkIf cfg.doc.enable {
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environment.pathsToLink = [ "/share/doc" ];
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environment.extraOutputsToInstall = [ "doc" ] ++ optional cfg.dev.enable "devdoc";
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})
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(mkIf cfg.nixos.enable {
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system.build.manual = manual;
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environment.systemPackages = []
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++ optional cfg.man.enable manual.manpages
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++ optionals cfg.doc.enable [ manual.manualHTML nixos-help ];
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services.getty.helpLine = mkIf cfg.doc.enable (
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"\nRun 'nixos-help' for the NixOS manual."
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);
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})
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]);
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}
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