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# Management of static files in /etc.
{ config, lib, pkgs, ... }:
with lib;
let
etc' = filter (f: f.enable) (attrValues config.environment.etc);
etc = pkgs.stdenvNoCC.mkDerivation {
name = "etc";
builder = ./make-etc.sh;
preferLocalBuild = true;
allowSubstitutes = false;
/* !!! Use toXML. */
sources = map (x: x.source) etc';
targets = map (x: x.target) etc';
modes = map (x: x.mode) etc';
users = map (x: x.user) etc';
groups = map (x: x.group) etc';
};
in
{
###### interface
options = {
environment.etc = mkOption {
default = {};
example = literalExample ''
{ example-configuration-file =
{ source = "/nix/store/.../etc/dir/file.conf.example";
mode = "0440";
};
"default/useradd".text = "GROUP=100 ...";
}
'';
description = ''
Set of files that have to be linked in <filename>/etc</filename>.
'';
type = with types; attrsOf (submodule (
{ name, config, ... }:
{ options = {
enable = mkOption {
type = types.bool;
default = true;
description = ''
Whether this /etc file should be generated. This
option allows specific /etc files to be disabled.
'';
};
target = mkOption {
type = types.str;
description = ''
Name of symlink (relative to
<filename>/etc</filename>). Defaults to the attribute
name.
'';
};
text = mkOption {
default = null;
type = types.nullOr types.lines;
description = "Text of the file.";
};
source = mkOption {
type = types.path;
description = "Path of the source file.";
};
mode = mkOption {
type = types.str;
default = "symlink";
example = "0600";
description = ''
If set to something else than <literal>symlink</literal>,
the file is copied instead of symlinked, with the given
file mode.
'';
};
uid = mkOption {
default = 0;
type = types.int;
description = ''
UID of created file. Only takes effect when the file is
copied (that is, the mode is not 'symlink').
'';
};
gid = mkOption {
default = 0;
type = types.int;
description = ''
GID of created file. Only takes effect when the file is
copied (that is, the mode is not 'symlink').
'';
};
user = mkOption {
default = "+${toString config.uid}";
type = types.str;
description = ''
User name of created file.
Only takes effect when the file is copied (that is, the mode is not 'symlink').
Changing this option takes precedence over <literal>uid</literal>.
'';
};
group = mkOption {
default = "+${toString config.gid}";
type = types.str;
description = ''
Group name of created file.
Only takes effect when the file is copied (that is, the mode is not 'symlink').
Changing this option takes precedence over <literal>gid</literal>.
'';
};
};
config = {
target = mkDefault name;
source = mkIf (config.text != null) (
let name' = "etc-" + baseNameOf name;
in mkDefault (pkgs.writeText name' config.text));
};
}));
};
};
###### implementation
config = {
system.build.etc = etc;
system.activationScripts.etc = stringAfter [ "users" "groups" ]
''
# Set up the statically computed bits of /etc.
echo "setting up /etc..."
${pkgs.perl.withPackages (p: [ p.FileSlurp ])}/bin/perl ${./setup-etc.pl} ${etc}/etc
'';
};
}
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