teyrebaz33 f10e26f731 fix: auto-enable systemd linger during gateway install on headless servers ...

Fixes #1005

Without linger, user-level systemd services stop when the SSH session
ends — even though systemctl --user status shows active (running).

Changes to systemd_install():
- Try loginctl enable-linger automatically (succeeds when the process
  has the required privileges)
- If loginctl fails (no privileges), print a clear, copy-pasteable
  warning with the exact command the user must run

New helper: _ensure_linger_enabled()
- Fast path: checks /var/lib/systemd/linger/<user> (no subprocess)
- Auto-enable: loginctl enable-linger <user>
- Fallback: actionable warning with sudo command + restart instructions

Tests: 4 new tests in TestEnsureLingerEnabled, 205 passed total

2026-03-14 11:46:59 -07:00

4.9 KiB

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