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
|
{ config, options, lib, pkgs, ... }:
with lib;
let
cfg = config.nixpkgs;
opt = options.nixpkgs;
isConfig = x:
builtins.isAttrs x || lib.isFunction x;
optCall = f: x:
if lib.isFunction f
then f x
else f;
mergeConfig = lhs_: rhs_:
let
lhs = optCall lhs_ { inherit pkgs; };
rhs = optCall rhs_ { inherit pkgs; };
in
recursiveUpdate lhs rhs //
optionalAttrs (lhs ? packageOverrides) {
packageOverrides = pkgs:
optCall lhs.packageOverrides pkgs //
optCall (attrByPath ["packageOverrides"] ({}) rhs) pkgs;
} //
optionalAttrs (lhs ? perlPackageOverrides) {
perlPackageOverrides = pkgs:
optCall lhs.perlPackageOverrides pkgs //
optCall (attrByPath ["perlPackageOverrides"] ({}) rhs) pkgs;
};
configType = mkOptionType {
name = "nixpkgs-config";
description = "nixpkgs config";
check = x:
let traceXIfNot = c:
if c x then true
else lib.traceSeqN 1 x false;
in traceXIfNot isConfig;
merge = args: fold (def: mergeConfig def.value) {};
};
overlayType = mkOptionType {
name = "nixpkgs-overlay";
description = "nixpkgs overlay";
check = lib.isFunction;
merge = lib.mergeOneOption;
};
pkgsType = mkOptionType {
name = "nixpkgs";
description = "An evaluation of Nixpkgs; the top level attribute set of packages";
check = builtins.isAttrs;
};
defaultPkgs = import ../../.. {
inherit (cfg) config overlays localSystem crossSystem;
};
finalPkgs = if opt.pkgs.isDefined then cfg.pkgs.appendOverlays cfg.overlays else defaultPkgs;
in
{
options.nixpkgs = {
pkgs = mkOption {
defaultText = literalExample
''import "''${nixos}/.." {
inherit (cfg) config overlays localSystem crossSystem;
}
'';
type = pkgsType;
example = literalExample "import <nixpkgs> {}";
description = ''
If set, the pkgs argument to all NixOS modules is the value of
this option, extended with <code>nixpkgs.overlays</code>, if
that is also set. Either <code>nixpkgs.crossSystem</code> or
<code>nixpkgs.localSystem</code> will be used in an assertion
to check that the NixOS and Nixpkgs architectures match. Any
other options in <code>nixpkgs.*</code>, notably <code>config</code>,
will be ignored.
If unset, the pkgs argument to all NixOS modules is determined
as shown in the default value for this option.
The default value imports the Nixpkgs source files
relative to the location of this NixOS module, because
NixOS and Nixpkgs are distributed together for consistency,
so the <code>nixos</code> in the default value is in fact a
relative path. The <code>config</code>, <code>overlays</code>,
<code>localSystem</code>, and <code>crossSystem</code> come
from this option's siblings.
This option can be used by applications like NixOps to increase
the performance of evaluation, or to create packages that depend
on a container that should be built with the exact same evaluation
of Nixpkgs, for example. Applications like this should set
their default value using <code>lib.mkDefault</code>, so
user-provided configuration can override it without using
<code>lib</code>.
Note that using a distinct version of Nixpkgs with NixOS may
be an unexpected source of problems. Use this option with care.
'';
};
config = mkOption {
default = {};
example = literalExample
''
{ allowBroken = true; allowUnfree = true; }
'';
type = configType;
description = ''
The configuration of the Nix Packages collection. (For
details, see the Nixpkgs documentation.) It allows you to set
package configuration options.
Ignored when <code>nixpkgs.pkgs</code> is set.
'';
};
overlays = mkOption {
default = [];
example = literalExample
''
[
(self: super: {
openssh = super.openssh.override {
hpnSupport = true;
kerberos = self.libkrb5;
};
})
]
'';
type = types.listOf overlayType;
description = ''
List of overlays to use with the Nix Packages collection.
(For details, see the Nixpkgs documentation.) It allows
you to override packages globally. Each function in the list
takes as an argument the <emphasis>original</emphasis> Nixpkgs.
The first argument should be used for finding dependencies, and
the second should be used for overriding recipes.
If <code>nixpkgs.pkgs</code> is set, overlays specified here
will be applied after the overlays that were already present
in <code>nixpkgs.pkgs</code>.
'';
};
localSystem = mkOption {
type = types.attrs; # TODO utilize lib.systems.parsedPlatform
default = { inherit (cfg) system; };
example = { system = "aarch64-linux"; config = "aarch64-unknown-linux-gnu"; };
# Make sure that the final value has all fields for sake of other modules
# referring to this. TODO make `lib.systems` itself use the module system.
apply = lib.systems.elaborate;
defaultText = literalExample
''(import "''${nixos}/../lib").lib.systems.examples.aarch64-multiplatform'';
description = ''
Specifies the platform on which NixOS should be built. When
<code>nixpkgs.crossSystem</code> is unset, it also specifies
the platform <emphasis>for</emphasis> which NixOS should be
built. If this option is unset, it defaults to the platform
type of the machine where evaluation happens. Specifying this
option is useful when doing distributed multi-platform
deployment, or when building virtual machines. See its
description in the Nixpkgs manual for more details.
Ignored when <code>nixpkgs.pkgs</code> is set.
'';
};
crossSystem = mkOption {
type = types.nullOr types.attrs; # TODO utilize lib.systems.parsedPlatform
default = null;
example = { system = "aarch64-linux"; config = "aarch64-unknown-linux-gnu"; };
description = ''
Specifies the platform for which NixOS should be
built. Specify this only if it is different from
<code>nixpkgs.localSystem</code>, the platform
<emphasis>on</emphasis> which NixOS should be built. In other
words, specify this to cross-compile NixOS. Otherwise it
should be set as null, the default. See its description in the
Nixpkgs manual for more details.
Ignored when <code>nixpkgs.pkgs</code> is set.
'';
};
system = mkOption {
type = types.str;
example = "i686-linux";
description = ''
Specifies the Nix platform type on which NixOS should be built.
It is better to specify <code>nixpkgs.localSystem</code> instead.
<programlisting>
{
nixpkgs.system = ..;
}
</programlisting>
is the same as
<programlisting>
{
nixpkgs.localSystem.system = ..;
}
</programlisting>
See <code>nixpkgs.localSystem</code> for more information.
Ignored when <code>nixpkgs.localSystem</code> is set.
Ignored when <code>nixpkgs.pkgs</code> is set.
'';
};
initialSystem = mkOption {
type = types.str;
internal = true;
description = ''
Preserved value of <literal>system</literal> passed to <literal>eval-config.nix</literal>.
'';
};
};
config = {
_module.args = {
pkgs = finalPkgs;
};
assertions = [
(
let
nixosExpectedSystem =
if config.nixpkgs.crossSystem != null
then config.nixpkgs.crossSystem.system or (lib.systems.parse.doubleFromSystem (lib.systems.parse.mkSystemFromString config.nixpkgs.crossSystem.config))
else config.nixpkgs.localSystem.system or (lib.systems.parse.doubleFromSystem (lib.systems.parse.mkSystemFromString config.nixpkgs.localSystem.config));
nixosOption =
if config.nixpkgs.crossSystem != null
then "nixpkgs.crossSystem"
else "nixpkgs.localSystem";
pkgsSystem = finalPkgs.stdenv.targetPlatform.system;
in {
assertion = nixosExpectedSystem == pkgsSystem;
message = "The NixOS nixpkgs.pkgs option was set to a Nixpkgs invocation that compiles to target system ${pkgsSystem} but NixOS was configured for system ${nixosExpectedSystem} via NixOS option ${nixosOption}. The NixOS system settings must match the Nixpkgs target system.";
}
)
];
};
}
|