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home-manager/modules/config/i18n.nix
Rodney Lorrimar 3be2abb2e6
i18n: Use glibcLocales from NixOS if possible (#2333) (#4177)
This will reduce the system closure size by about 200MB under NixOS by
sharing the glibcLocales package.

When home-manager is installed on Linux without the NixOS module, all
glibc locales are installed, as before.

Resolves: #2333
2023-07-04 11:28:25 +02:00

72 lines
2.3 KiB
Nix

# The glibc package in Nixpkgs is patched to make it possible to specify
# an alternative path for the locale archive through a special environment
# variable. This would allow different versions of glibc to coexist on the
# same system because each version of glibc could look up different paths
# for its locale archive should the archive format ever change in
# incompatible ways.
#
# See also:
# - localedef(1)
# - https://nixos.org/manual/nixpkgs/stable/#locales
# - https://github.com/NixOS/nixpkgs/issues/38991
#
# Note, the name of the said environment variable gets updated with each
# breaking release of the glibcLocales package. Periodically check the link
# below for changes:
# https://github.com/NixOS/nixpkgs/blob/nixpkgs-unstable/pkgs/development/libraries/glibc/nix-locale-archive.patch
{ lib, pkgs, config, ... }:
with lib;
let
inherit (config.i18n) glibcLocales;
inherit (glibcLocales) version;
archivePath = "${glibcLocales}/lib/locale/locale-archive";
# lookup the version of glibcLocales and set the appropriate environment vars
localeVars = if versionAtLeast version "2.27" then {
LOCALE_ARCHIVE_2_27 = archivePath;
} else if versionAtLeast version "2.11" then {
LOCALE_ARCHIVE_2_11 = archivePath;
} else
{ };
in {
meta.maintainers = with maintainers; [ midchildan ];
options = {
i18n.glibcLocales = mkOption {
type = types.path;
description = ''
Customized <literal>glibcLocales</literal> package providing
the <literal>LOCALE_ARCHIVE_*</literal> environment variable.
</para><para>
This option only applies to the Linux platform.
</para><para>
When Home Manager is configured with NixOS, the default value
will be set to <varname>i18n.glibcLocales</varname> from the
system configuration.
'';
example = literalExpression ''
pkgs.glibcLocales.override {
allLocales = false;
locales = [ "en_US.UTF-8/UTF-8" ];
}
'';
# NB. See nixos/default.nix for NixOS default.
default = pkgs.glibcLocales;
defaultText = literalExpression "pkgs.glibcLocales";
};
};
config = mkIf pkgs.stdenv.hostPlatform.isLinux {
# For shell sessions.
home.sessionVariables = localeVars;
# For desktop apps.
systemd.user.sessionVariables = localeVars;
};
}