systemd: skip unavailable gamescope user services

[myakupozluk]

Summary

• skip gamescope-xbindkeys.service unless /etc/xbindkeysrc exists
• skip steam-notif-daemon.service unless its executable is installed

Both units are wanted by the session target, but their optional inputs are not supplied by the standard package set. Conditions let an unconfigured repo-only installation start without persistent failed user units, while preserving each service when its dependency becomes available.

Closes #22

Validation

• systemd-analyze verify accepted both unit files; its only diagnostics are expected local absences of the optional executables
• git diff --check

[Copilot]

🟢 Approval recommended

The added systemd ConditionPathExists= checks are correctly placed and should prevent the reported recurring user-unit failures without changing behavior when dependencies are present.

Pull request overview

This PR updates optional user systemd services in gamescope-session to avoid persistent failed units on repo-only installs by adding runtime conditions that skip the services when their required inputs aren’t present.

Changes:

• Add a systemd condition to skip gamescope-xbindkeys.service unless /etc/xbindkeysrc exists.
• Add a systemd condition to skip steam-notif-daemon.service unless /usr/bin/steam_notif_daemon exists.

File summaries

File	Description
usr/lib/systemd/user/gamescope-xbindkeys.service	Adds ConditionPathExists=/etc/xbindkeysrc so the unit cleanly skips when the config isn’t present.
usr/lib/systemd/user/steam-notif-daemon.service	Adds ConditionPathExists=/usr/bin/steam_notif_daemon so the unit cleanly skips when the optional daemon isn’t installed.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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