1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
|
{ 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 // {
class = "nixos";
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}";
guard = lib.warn "Attempt to evaluate package ${wholeName} in option documentation; this is not supported and will eventually be an error. Use `mkPackageOption{,MD}` or `literalExpression` instead.";
in if isAttrs value then
scrubDerivations wholeName value
// optionalAttrs (isDerivation value) {
outPath = guard "\${${wholeName}}";
drvPath = guard drvPath;
}
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 = "System Manual";
comment = "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;
system.activationScripts.check-manual-docbook = ''
if [[ $(cat ${manual.optionsUsedDocbook}) = 1 ]]; then
echo -e "\e[31;1mwarning\e[0m: This configuration contains option documentation in docbook." \
"Support for docbook is deprecated and will be removed after NixOS 23.05." \
"See nix-store --read-log ${builtins.unsafeDiscardStringContext manual.optionsJSON.drvPath}"
fi
'';
environment.systemPackages = []
++ optional cfg.man.enable manual.manpages
++ optionals cfg.doc.enable [ manual.manualHTML nixos-help ];
})
]);
}
|