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fix(nix): make extraPackages actually work via per-user profile (#17047)

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* fix(nix): make extraPackages actually work — wire into per-user profile

#17030 deprecated extraPackages because it only set the systemd service
PATH, which the terminal backend's login-shell snapshot discards.

Instead of deprecating, fix it: set users.users.${cfg.user}.packages
so NixOS builds a per-user profile at /etc/profiles/per-user/hermes/bin.
This path is included in PATH by /etc/set-environment, which the login
shell sources, so the terminal backend's snapshot picks it up.

One line of actual logic:
  users.users.${cfg.user}.packages = cfg.extraPackages;

Verified in a NixOS VM test: su - hermes -c 'which hello' resolves
to /etc/profiles/per-user/hermes/bin/hello.

Reverts the deprecation warning and docs changes from #17030, restores
extraPackages as the recommended way to give the agent extra tools.

Container mode is unaffected — extraPackages was always native-only
(the systemd path line is inside !cfg.container.enable).

* nix: clarify additive merge semantics for extraPackages user profile

---------

Co-authored-by: Siddharth Balyan <daimon@noreply.github.com>
This commit is contained in:
Siddharth Balyan
2026-04-28 23:50:32 +05:30
committed by GitHub
parent a3c27b5cd1
commit 4bf0e75ae9
2 changed files with 18 additions and 28 deletions
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11
website/docs/getting-started/nix-setup.md
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@@ -321,7 +321,7 @@ Quick reference for the most common things Nix users want to customize:
| Pass GPU access to container | `container.extraOptions` | `[ "--gpus" "all" ]` |
| Use Podman instead of Docker | `container.backend` | `"podman"` |
| Share state between host CLI and container | `container.hostUsers` | `[ "sidbin" ]` |
| Make extra tools available to the agent | `environment.systemPackages` (top-level NixOS) | `[ pkgs.pandoc pkgs.imagemagick ]` |
| Make extra tools available to the agent | `extraPackages` | `[ pkgs.pandoc pkgs.imagemagick ]` |
| Use a custom base image | `container.image` | `"ubuntu:24.04"` |
| Override the hermes package | `package` | `inputs.hermes-agent.packages.${system}.default.override { ... }` |
| Change state directory | `stateDir` | `"/opt/hermes"` |
@@ -648,14 +648,11 @@ The package's `site-packages` is added to PYTHONPATH in the hermes wrapper. `imp
A directory plugin with third-party Python dependencies needs both options:
```nix
# Plugin config
services.hermes-agent = {
extraPlugins = [ my-plugin-src ]; # plugin source
extraPythonPackages = [ pkgs.python312Packages.redis ]; # its Python dep
extraPackages = [ pkgs.redis ]; # system binary it needs
};
# System binaries the plugin needs — available to terminal, skills, cron
environment.systemPackages = [ pkgs.redis ];
```
### Using the Overlay
@@ -810,7 +807,7 @@ nix build .#checks.x86_64-linux.config-roundtrip # merge script preserves use
| Option | Type | Default | Description |
|---|---|---|---|
| `extraArgs` | `listOf str` | `[]` | Extra args for `hermes gateway` |
| `extraPackages` | `listOf package` | `[]` | **Deprecated.** Use `environment.systemPackages` instead. Only affects the systemd service process — terminal commands, skills, and cron jobs do not see these packages |
| `extraPackages` | `listOf package` | `[]` | Extra packages available to the agent. Added to the hermes user's per-user profile so terminal commands, skills, and cron jobs all see them |
| `extraPlugins` | `listOf package` | `[]` | Directory plugin packages to symlink into `$HERMES_HOME/plugins/`. Each must contain `plugin.yaml` |
| `extraPythonPackages` | `listOf package` | `[]` | Python packages added to PYTHONPATH for entry-point plugin discovery. Build with `python312Packages` |
| `restart` | `str` | `"always"` | systemd `Restart=` policy |
@@ -948,4 +945,4 @@ nix-store --query --roots $(docker exec hermes-agent readlink /data/current-pack
| `nix-collect-garbage` removed hermes | GC root missing | Restart the service (preStart recreates the GC root) |
| `no container with name or ID "hermes-agent"` (Podman) | Podman rootful container not visible to regular user | Add passwordless sudo for podman (see [Container-aware CLI](#container-aware-cli) section) |
| `unable to find user hermes` | Container still starting (entrypoint hasn't created user yet) | Wait a few seconds and retry — the CLI retries automatically |
| Tool added via `extraPackages` not found in terminal | `extraPackages` only sets the systemd service PATH, not the terminal backend's | Move to `environment.systemPackages` — see deprecation warning at build time |
| Tool added via `extraPackages` not found in terminal | Requires `nixos-rebuild switch` to update the per-user profile | Rebuild and restart: `nixos-rebuild switch && systemctl restart hermes-agent` |