postinstall is platform-specific (systemd) and runs sudo during install — make platform-agnostic / opt-in

[Shinrai]

Tracking issue — not urgent.

postinstall.js runs on every npm install. On a systemd Linux host it attempts sudo cp wol-proxy.service /etc/systemd/system/ + sudo systemctl daemon-reload. Problems:

• Platform-specific: only handles systemd Linux. No macOS (launchd), Windows (services), or non-systemd Linux (OpenRC/runit/s6) — those users get nothing, and the "service" story is Linux-only.
• Runs sudo from an install hook: privileged operations during npm install are surprising and fragile — they can prompt for a password, silently fail, or (on CI runners, where sudo is passwordless and /etc/systemd/system exists) actually mutate the host. It currently fires during CI npm ci.
• Auto-installing a system service as an install side effect is unexpected behavior for a library/CLI.

Direction for a later pass (make it platform-agnostic):

• Move service installation out of postinstall into an explicit, opt-in command (e.g. a wol-proxy install-service bin subcommand, or documented manual steps).
• Detect the platform and either support the common init systems (systemd / launchd / Windows service) or clearly document manual setup per platform.
• Never sudo from postinstall; skip entirely under CI (process.env.CI).

Surfaced during the @v4 onboarding (the onboarding installs devDeps with --ignore-scripts locally to avoid this).