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1645acf1d3
Before whenever environment variables changed, pam files had to be rebuild. This is expensive since each file needs its own sandbox set up.
105 lines
3.4 KiB
Nix
105 lines
3.4 KiB
Nix
# This module defines a system-wide environment that will be
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# initialised by pam_env (that is, not only in shells).
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.environment;
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in
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{
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options = {
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environment.sessionVariables = mkOption {
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default = {};
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description = ''
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A set of environment variables used in the global environment.
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These variables will be set by PAM early in the login process.
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The value of each session variable can be either a string or a
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list of strings. The latter is concatenated, interspersed with
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colon characters.
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Note, due to limitations in the PAM format values may not
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contain the <literal>"</literal> character.
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Also, these variables are merged into
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<xref linkend="opt-environment.variables"/> and it is
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therefore not possible to use PAM style variables such as
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<code>@{HOME}</code>.
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'';
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type = with types; attrsOf (either str (listOf str));
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apply = mapAttrs (n: v: if isList v then concatStringsSep ":" v else v);
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};
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environment.profileRelativeSessionVariables = mkOption {
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type = types.attrsOf (types.listOf types.str);
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example = { PATH = [ "/bin" ]; MANPATH = [ "/man" "/share/man" ]; };
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description = ''
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Attribute set of environment variable used in the global
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environment. These variables will be set by PAM early in the
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login process.
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Variable substitution is available as described in
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<citerefentry>
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<refentrytitle>pam_env.conf</refentrytitle>
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<manvolnum>5</manvolnum>
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</citerefentry>.
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Each attribute maps to a list of relative paths. Each relative
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path is appended to the each profile of
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<option>environment.profiles</option> to form the content of
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the corresponding environment variable.
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Also, these variables are merged into
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<xref linkend="opt-environment.profileRelativeEnvVars"/> and it is
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therefore not possible to use PAM style variables such as
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<code>@{HOME}</code>.
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'';
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};
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};
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config = {
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environment.etc."pam/environment".text = let
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suffixedVariables =
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flip mapAttrs cfg.profileRelativeSessionVariables (envVar: suffixes:
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flip concatMap cfg.profiles (profile:
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map (suffix: "${profile}${suffix}") suffixes
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)
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);
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# We're trying to use the same syntax for PAM variables and env variables.
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# That means we need to map the env variables that people might use to their
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# equivalent PAM variable.
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replaceEnvVars = replaceStrings ["$HOME" "$USER"] ["@{HOME}" "@{PAM_USER}"];
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pamVariable = n: v:
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''${n} DEFAULT="${concatStringsSep ":" (map replaceEnvVars (toList v))}"'';
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pamVariables =
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concatStringsSep "\n"
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(mapAttrsToList pamVariable
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(zipAttrsWith (n: concatLists)
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[
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# Make sure security wrappers are prioritized without polluting
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# shell environments with an extra entry. Sessions which depend on
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# pam for its environment will otherwise have eg. broken sudo. In
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# particular Gnome Shell sometimes fails to source a proper
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# environment from a shell.
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{ PATH = [ config.security.wrapperDir ]; }
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(mapAttrs (n: toList) cfg.sessionVariables)
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suffixedVariables
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]));
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in ''
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${pamVariables}
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'';
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};
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}
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