Path-Activated Unit

systemd · medium · solved in-browser (no VM needed) · 3 tiered hints

Write /etc/systemd/system/process-spool.path, a .path unit that starts work when a trigger file appears. Include a [Path] section with PathExists=/var/spool/incoming/trigger and Unit=process-spool.service, plus an [Install] section with WantedBy=multi-user.target. (Authored config, graded structurally — the engine isn't run here.)

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