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codex: support XDG Base Directory specification

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- Configuration file is now placed in XDG_CONFIG_HOME/codex/config.toml by default for versions >=0.2.0 when preferXdgDirectories is enabled.
- Falls back to ~/.codex/config.yaml for versions <0.2.0 and to ~/.codex/config.toml when preferXdgDirectories is disabled
- Sets CODEX_HOME environment variable to $XDG_CONFIG_HOME/codex when using XDG directories.
- Updated tests to verify XDG directory behavior and environment variable presence.
This commit is contained in:
Thierry Delafontaine 2025-08-07 12:27:33 +02:00 • committed by Austin Horstman
parent d8a475e179
commit faa5b42eca
6 changed files with 78 additions and 12 deletions
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36
modules/programs/codex.nix
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@ -15,7 +15,6 @@ let
packageVersion = if cfg.package != null then lib.getVersion cfg.package else "0.2.0";
isTomlConfig = lib.versionAtLeast packageVersion "0.2.0";
settingsFormat = if isTomlConfig then tomlFormat else yamlFormat;
configFileName = if isTomlConfig then ".codex/config.toml" else ".codex/config.yaml";
in
{
meta.maintainers = [
@ -31,7 +30,9 @@ in
# NOTE: `yaml` type supports null, using `nullOr` for backwards compatibility period
type = lib.types.nullOr tomlFormat.type;
description = ''
Configuration written to {file}`~/.codex/config.toml` (0.2.0+) or {file}`~/.codex/config.yaml` (<0.2.0).
Configuration written to {file}`CODEX_HOME/config.toml` (0.2.0+)
or {file}`~/.codex/config.yaml` (<0.2.0). Per default {env}`CODEX_HOME`
defaults to ~/.codex.
See <https://github.com/openai/codex/blob/main/codex-rs/config.md> for supported values.
'';
default = { };
@ -63,16 +64,27 @@ in
};
};
config = mkIf cfg.enable {
home.packages = mkIf (cfg.package != null) [ cfg.package ];
home.file = {
"${configFileName}" = lib.mkIf (cfg.settings != { }) {
source = settingsFormat.generate "codex-config" cfg.settings;
};
".codex/AGENTS.md" = lib.mkIf (cfg.custom-instructions != "") {
text = cfg.custom-instructions;
config =
let
useXdgDirectories = (config.home.preferXdgDirectories && isTomlConfig);
xdgConfigHome = lib.removePrefix config.home.homeDirectory config.xdg.configHome;
configDir = if useXdgDirectories then "${xdgConfigHome}/codex" else ".codex";
configFileName = if isTomlConfig then "config.toml" else "config.yaml";
in
mkIf cfg.enable {
home = {
packages = mkIf (cfg.package != null) [ cfg.package ];
file = {
"${configDir}/${configFileName}" = lib.mkIf (cfg.settings != { }) {
source = settingsFormat.generate "codex-config" cfg.settings;
};
"${configDir}/AGENTS.md" = lib.mkIf (cfg.custom-instructions != "") {
text = cfg.custom-instructions;
};
};
sessionVariables = mkIf useXdgDirectories {
CODEX_HOME = "${config.xdg.configHome}/codex";
};
};
};
};
}