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# This module defines a system-wide environment that will be
# initialised by pam_env (that is, not only in shells).
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.environment;
in
{
options = {
environment.sessionVariables = mkOption {
default = {};
description = ''
A set of environment variables used in the global environment.
These variables will be set by PAM.
The value of each variable can be either a string or a list of
strings. The latter is concatenated, interspersed with colon
characters.
'';
type = with types; attrsOf (either str (listOf str));
apply = mapAttrs (n: v: if isList v then concatStringsSep ":" v else v);
};
};
config = {
system.build.pamEnvironment = pkgs.writeText "pam-environment"
''
${concatStringsSep "\n" (
(mapAttrsToList (n: v: ''${n}="${concatStringsSep ":" v}"'')
(zipAttrsWith (const concatLists) ([ (mapAttrs (n: v: [ v ]) cfg.sessionVariables) ]))))}
'';
};
}
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