nixpkgs/nixos/modules/misc/man-db.nix

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{ config, pkgs, lib, ... }:
let
cfg = config.documentation.man.man-db;
in
{
options = {
documentation.man.man-db = {
enable = lib.mkEnableOption "man-db as the default man page viewer" // {
default = config.documentation.man.enable;
defaultText = lib.literalExpression "config.documentation.man.enable";
example = false;
};
skipPackages = lib.mkOption {
type = lib.types.listOf lib.types.package;
default = [];
internal = true;
description = ''
Packages to *not* include in the man-db.
This can be useful to avoid unnecessary rebuilds due to packages that change frequently, like nixos-version.
'';
};
manualPages = lib.mkOption {
type = lib.types.path;
default = pkgs.buildEnv {
name = "man-paths";
paths = lib.subtractLists cfg.skipPackages config.environment.systemPackages;
pathsToLink = [ "/share/man" ];
extraOutputsToInstall = [ "man" ]
++ lib.optionals config.documentation.dev.enable [ "devman" ];
ignoreCollisions = true;
};
defaultText = lib.literalMD "all man pages in {option}`config.environment.systemPackages`";
description = ''
The manual pages to generate caches for if {option}`documentation.man.generateCaches`
is enabled. Must be a path to a directory with man pages under
`/share/man`; see the source for an example.
Advanced users can make this a content-addressed derivation to save a few rebuilds.
'';
};
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package = lib.mkOption {
type = lib.types.package;
default = pkgs.man-db;
defaultText = lib.literalExpression "pkgs.man-db";
description = ''
The `man-db` derivation to use. Useful to override
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configuration options used for the package.
'';
};
};
};
imports = [
(lib.mkRenamedOptionModule [ "documentation" "man" "manualPages" ] [ "documentation" "man" "man-db" "manualPages" ])
];
config = lib.mkIf cfg.enable {
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environment.systemPackages = [ cfg.package ];
environment.etc."man_db.conf".text =
let
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manualCache = pkgs.runCommand "man-cache" {
nativeBuildInputs = [ cfg.package ];
} ''
echo "MANDB_MAP ${cfg.manualPages}/share/man $out" > man.conf
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mandb -C man.conf -psc >/dev/null 2>&1
'';
in
''
# Manual pages paths for NixOS
MANPATH_MAP /run/current-system/sw/bin /run/current-system/sw/share/man
MANPATH_MAP /run/wrappers/bin /run/current-system/sw/share/man
${lib.optionalString config.documentation.man.generateCaches ''
# Generated manual pages cache for NixOS (immutable)
MANDB_MAP /run/current-system/sw/share/man ${manualCache}
''}
# Manual pages caches for NixOS
MANDB_MAP /run/current-system/sw/share/man /var/cache/man/nixos
'';
};
}