When `sudo hermes gateway install --system --run-as-user <user>` generates
the systemd unit, get_hermes_home() resolves to /root/.hermes because
Path.home() returns root's home under sudo. The unit correctly sets
HOME= and User= via _system_service_identity(), but HERMES_HOME was
computed independently and pointed to root's config directory.
Add _hermes_home_for_target_user() which remaps the current HERMES_HOME
to the equivalent path under the target user's home. This handles:
- Default ~/.hermes → target user's ~/.hermes
- Profiles (e.g. ~/.hermes/profiles/coder) → preserves relative structure
- Custom paths (e.g. /opt/hermes) → kept as-is
Supersedes #3861 which only handled the default case and left profiles
broken (also flagged by Copilot review).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Dean Kerr
e905768ffd