blob: 3f669ba7d2e1677251500c772196bb71f57426b6 (
plain) (
blame)
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
|
{ config, lib, pkgs, modules, ... }:
with lib;
let
# Location of the repository on the harddrive
nixosPath = toString ../..;
# Check if the path is from the NixOS repository
isNixOSFile = path:
let s = toString path; in
removePrefix nixosPath s != s;
# Copy modules given as extra configuration files. Unfortunately, we
# cannot serialized attribute set given in the list of modules (that's why
# you should use files).
moduleFiles =
# FIXME: use typeOf (Nix 1.6.1).
filter (x: !isAttrs x && !lib.isFunction x) modules;
# Partition module files because between NixOS and non-NixOS files. NixOS
# files may change if the repository is updated.
partitionedModuleFiles =
let p = partition isNixOSFile moduleFiles; in
{ nixos = p.right; others = p.wrong; };
# Path transformed to be valid on the installation device. Thus the
# device configuration could be rebuild.
relocatedModuleFiles =
let
relocateNixOS = path:
"<nixpkgs/nixos" + removePrefix nixosPath (toString path) + ">";
in
{ nixos = map relocateNixOS partitionedModuleFiles.nixos;
others = []; # TODO: copy the modules to the install-device repository.
};
# A dummy /etc/nixos/configuration.nix in the booted CD that
# rebuilds the CD's configuration (and allows the configuration to
# be modified, of course, providing a true live CD). Problem is
# that we don't really know how the CD was built - the Nix
# expression language doesn't allow us to query the expression being
# evaluated. So we'll just hope for the best.
configClone = pkgs.writeText "configuration.nix"
''
{ config, pkgs, ... }:
{
imports = [ ${toString config.installer.cloneConfigIncludes} ];
${config.installer.cloneConfigExtra}
}
'';
in
{
options = {
installer.cloneConfig = mkOption {
default = true;
description = ''
Try to clone the installation-device configuration by re-using it's
profile from the list of imported modules.
'';
};
installer.cloneConfigIncludes = mkOption {
default = [];
example = [ "./nixos/modules/hardware/network/rt73.nix" ];
description = ''
List of modules used to re-build this installation device profile.
'';
};
installer.cloneConfigExtra = mkOption {
default = "";
description = ''
Extra text to include in the cloned configuration.nix included in this
installer.
'';
};
};
config = {
installer.cloneConfigIncludes =
relocatedModuleFiles.nixos ++ relocatedModuleFiles.others;
boot.postBootCommands =
''
# Provide a mount point for nixos-install.
mkdir -p /mnt
${optionalString config.installer.cloneConfig ''
# Provide a configuration for the CD/DVD itself, to allow users
# to run nixos-rebuild to change the configuration of the
# running system on the CD/DVD.
if ! [ -e /etc/nixos/configuration.nix ]; then
cp ${configClone} /etc/nixos/configuration.nix
fi
''}
'';
};
}
|