Michael Chapman 708961c701 core/path: recheck path specs when triggered unit changes state ... As documented in systemd.path(5): When a service unit triggered by a path unit terminates (regardless whether it exited successfully or failed), monitored paths are checked immediately again, and the service accordingly restarted instantly. This commit implements this behaviour for PathExists=, PathExistsGlob=, and DirectoryNotEmpty=. These predicates are essentially "level-triggered": the service should be activated whenever the predicate is true. PathChanged= and PathModified=, on the other hand, are "edge-triggered": the service should only be activated when the predicate *becomes* true. The behaviour has been broken since at least as far back as commit 8fca6944c2 ("path: stop watching path specs once we triggered the target unit"). This commit had systemd stop monitoring inotify whenever the triggered unit was activated. Unfortunately this meant it never updated the ->inotify_triggered flag, so it never rechecked the path specs when the triggered unit deactivated. With this commit, systemd rechecks all paths specs whenever the triggered unit deactivates. If any PathExists=, PathExistsGlob= or DirectoryNotEmpty= predicate passes, the triggered unit is reactivated. If the target unit is activated by something outside of the path unit, the path unit immediately transitions to a running state. This ensures the path unit stops monitoring inotify in this situation. With this change in place, commit d7cf8c24d4 ("core/path: fix spurious triggering of PathExists= on restart/reload") is no longer necessary. The path unit (and its triggered unit) is now always active whenever the PathExists= predicate passes, so there is no spurious restart when systemd is reloaded or restarted.		2020-05-05 13:56:02 +10:00
..
basic.target
path-changed.path
path-changed.service	core/path: recheck path specs when triggered unit changes state	2020-05-05 13:56:02 +10:00
path-directorynotempty.path
path-directorynotempty.service	core/path: recheck path specs when triggered unit changes state	2020-05-05 13:56:02 +10:00
path-exists.path
path-exists.service	core/path: recheck path specs when triggered unit changes state	2020-05-05 13:56:02 +10:00
path-existsglob.path
path-existsglob.service	core/path: recheck path specs when triggered unit changes state	2020-05-05 13:56:02 +10:00
path-makedirectory.path
path-makedirectory.service	core/path: recheck path specs when triggered unit changes state	2020-05-05 13:56:02 +10:00
path-modified.path
path-modified.service	core/path: recheck path specs when triggered unit changes state	2020-05-05 13:56:02 +10:00
path-mycustomunit.service	core/path: recheck path specs when triggered unit changes state	2020-05-05 13:56:02 +10:00
path-service.service
path-unit.path
paths.target
sysinit.target