
xss-lock needs XDG_SESSION_ID to respond to loginctl lock-session(s) (and possibly other session operations such as idle hint management). This change adds XDG_SESSION_ID to the list of imported environment variables when starting systemctl. Inspired by home-manager, add importVariables configuration. Set session to XDG_SESSION_ID when running xss-lock as a service. Co-authored-by: misuzu <bakalolka@gmail.com>
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