hermes-agent/nix
Siddharth Balyan 1789c2699a
feat(nix): shared-state permission model for interactive CLI users (#6796)
* feat(nix): shared-state permission model for interactive CLI users

Enable interactive CLI users in the hermes group to share full
read-write state (sessions, memories, logs, cron) with the gateway
service via a setgid + group-writable permission model.

Changes:

nix/nixosModules.nix:
- Directories use setgid 2770 (was 0750) so new files inherit the
  hermes group. home/ stays 0750 (no interactive write needed).
- Activation script creates HERMES_HOME subdirs (cron, sessions, logs,
  memories) — previously Python created them but managed mode now skips
  mkdir.
- Activation migrates existing runtime files to group-writable (chmod
  g+rw). Nix-managed files (config.yaml, .env, .managed) stay 0640/0644.
- Gateway systemd unit gets UMask=0007 so files it creates are 0660.

hermes_cli/config.py:
- ensure_hermes_home() splits into managed/unmanaged paths. Managed mode
  verifies dirs exist (raises RuntimeError if not) instead of creating
  them. Scoped umask(0o007) ensures SOUL.md is created as 0660.

hermes_logging.py:
- _ManagedRotatingFileHandler subclass applies chmod 0660 after log
  rotation in managed mode. RotatingFileHandler.doRollover() creates new
  files via open() which uses the process umask (0022 → 0644), not the
  scoped umask from ensure_hermes_home().

Verified with a 13-subtest NixOS VM integration test covering setgid,
interactive writes, file ownership, migration, and gateway coexistence.

Refs: #6044

* Fix managed log file mode on initial open

Co-authored-by: Siddharth Balyan <alt-glitch@users.noreply.github.com>

* refactor: simplify managed file handler and merge activation loops

- Cache is_managed() result in handler __init__ instead of lazy-importing
  on every _open()/_chmod_if_managed() call. Avoids repeated stat+env
  checks on log rotation.
- Merge two for-loops over the same subdir list in activation script
  into a single loop (mkdir + chown + chmod + find in one pass).

---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Siddharth Balyan <alt-glitch@users.noreply.github.com>
2026-04-10 03:48:42 +05:30
..
checks.nix remove config drift check for nix (#3061) 2026-03-25 15:46:29 -07:00
configMergeScript.nix feat: nix flake — uv2nix build, NixOS module, persistent container mode (#20) 2026-03-26 01:08:02 +05:30
devShell.nix feat: nix flake — uv2nix build, NixOS module, persistent container mode (#20) 2026-03-26 01:08:02 +05:30
nixosModules.nix feat(nix): shared-state permission model for interactive CLI users (#6796) 2026-04-10 03:48:42 +05:30
packages.nix nix: add tirith to runtime deps (#6721) 2026-04-09 22:28:00 +05:30
python.nix fix(nix): preserve voice deps on aarch64-darwin via nixpkgs (#5079) 2026-04-09 03:39:39 +05:30