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feat(nix): add extraPythonPackages option for entry-point plugins

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Overrides the hermes package with PYTHONPATH injection when
extraPythonPackages is non-empty. Plugin .dist-info directories
become visible to importlib.metadata for entry-point discovery.
Works in both native systemd and container modes.
This commit is contained in:
alt-glitch
2026-04-26 13:03:12 +05:30
parent bcf136c826
commit 356b1a9551
2 changed files with 33 additions and 6 deletions
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2
nix/checks.nix
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@@ -195,7 +195,7 @@ json.dump(sorted(leaf_paths(DEFAULT_CONFIG)), sys.stdout, indent=2)
# Verify extraPythonPackages PYTHONPATH injection
extra-python-packages = let
testPkg = pkgs.python312Packages.pyyaml;
testPkg = pkgs.python312Packages.pyfiglet;
hermesWithExtra = pkgs.callPackage ./hermes-agent.nix {
inherit (inputs) uv2nix pyproject-nix pyproject-build-systems;
npm-lockfile-fix = inputs'.npm-lockfile-fix.packages.default;

37
nix/nixosModules.nix
View File

@@ -28,6 +28,8 @@
let
cfg = config.services.hermes-agent;
effectivePackage = if cfg.extraPythonPackages == [ ] then cfg.package
else cfg.package.override { inherit (cfg) extraPythonPackages; };
hermes-agent = inputs.self.packages.${pkgs.stdenv.hostPlatform.system}.default;
# Deep-merge config type (from 0xrsydn/nix-hermes-agent)
@@ -479,6 +481,31 @@
'';
};
extraPythonPackages = mkOption {
type = types.listOf types.package;
default = [ ];
description = ''
Python packages to add to PYTHONPATH for entry-point plugin discovery.
These are pip-packaged plugins that register via the
hermes_agent.plugins entry-point group. Each package must be built
with the same Python interpreter as hermes (python312).
'';
example = literalExpression ''
[
(pkgs.python312Packages.buildPythonPackage {
pname = "rtk-hermes";
version = "1.0.0";
src = pkgs.fetchFromGitHub {
owner = "ogallotti";
repo = "rtk-hermes";
rev = "main";
hash = "sha256-...";
};
})
]
'';
};
restart = mkOption {
type = types.str;
default = "always";
@@ -593,7 +620,7 @@
# so interactive shells share state (sessions, skills, cron) with the
# gateway service instead of creating a separate ~/.hermes/.
(lib.mkIf cfg.addToSystemPackages {
environment.systemPackages = [ cfg.package ];
environment.systemPackages = [ effectivePackage ];
environment.variables.HERMES_HOME = "${cfg.stateDir}/.hermes";
})
@@ -832,7 +859,7 @@ HERMES_NIX_ENV_EOF
# reads them at Python startup — no systemd EnvironmentFile needed.
ExecStart = lib.concatStringsSep " " ([
"${cfg.package}/bin/hermes"
"${effectivePackage}/bin/hermes"
"gateway"
] ++ cfg.extraArgs);
@@ -855,7 +882,7 @@ HERMES_NIX_ENV_EOF
};
path = [
cfg.package
effectivePackage
pkgs.bash
pkgs.coreutils
pkgs.git
@@ -880,11 +907,11 @@ HERMES_NIX_ENV_EOF
preStart = ''
# Stable symlinks — container references these, not store paths directly
ln -sfn ${cfg.package} ${cfg.stateDir}/current-package
ln -sfn ${effectivePackage} ${cfg.stateDir}/current-package
ln -sfn ${containerEntrypoint} ${cfg.stateDir}/current-entrypoint
# GC roots so nix-collect-garbage doesn't remove store paths in use
${pkgs.nix}/bin/nix-store --add-root ${cfg.stateDir}/.gc-root --indirect -r ${cfg.package} 2>/dev/null || true
${pkgs.nix}/bin/nix-store --add-root ${cfg.stateDir}/.gc-root --indirect -r ${effectivePackage} 2>/dev/null || true
${pkgs.nix}/bin/nix-store --add-root ${cfg.stateDir}/.gc-root-entrypoint --indirect -r ${containerEntrypoint} 2>/dev/null || true
# Check if container needs (re)creation