This systemd service restarts Syncthing after resume from suspend
via sending SIGHUP. By default Syncthing detects resume from sleep
on its own by looking for jumps in the system clock. Since systemd
knows exactly when the system resumes from sleep let's trigger
the Syncthing restart from there. Doing this in systemd eliminates
some annoying delay, as the service is restarted immediately after
resume. Also, using the systemd dependency mechanism syncthing-inotify
is restarted as well.
$ journalctl -e --identifier syncthing --identifier syncthing-inotify --identifier systemd
Feb 22 09:44:27 kronos systemd[1]: Reached target Sleep.
Feb 22 09:44:27 kronos systemd[1]: Starting Suspend...
Feb 22 09:44:33 kronos systemd[1]: Time has been changed
Feb 22 09:44:33 kronos systemd[963]: Time has been changed
Feb 22 09:44:33 kronos systemd[1]: Started Suspend.
Feb 22 09:44:33 kronos systemd[1]: sleep.target: Unit not needed anymore. Stopping.
Feb 22 09:44:33 kronos systemd[1]: Stopped target Sleep.
Feb 22 09:44:33 kronos systemd[1]: Reached target Suspend.
Feb 22 09:44:33 kronos systemd[1]: suspend.target: Unit is bound to inactive unit systemd-suspend.service. Stopping, too.
Feb 22 09:44:33 kronos systemd[1]: Stopped target Suspend.
Feb 22 09:44:33 kronos systemd[1]: Starting Restart Syncthing after resume...
Feb 22 09:44:33 kronos syncthing[2561]: [35K66] OK: Exiting
Feb 22 09:44:33 kronos systemd[1]: Started Restart Syncthing after resume.
Feb 22 09:44:34 kronos systemd[963]: syncthing.service: Service hold-off time over, scheduling restart.
Feb 22 09:44:34 kronos systemd[963]: Stopping Syncthing Inotify File Watcher...
Feb 22 09:44:34 kronos systemd[963]: Stopped Syncthing Inotify File Watcher.
Feb 22 09:44:34 kronos systemd[963]: Stopped Syncthing - Open Source Continuous File Synchronization.
Feb 22 09:44:34 kronos systemd[963]: Started Syncthing - Open Source Continuous File Synchronization.
Feb 22 09:44:34 kronos systemd[963]: Started Syncthing Inotify File Watcher.
Feb 22 09:44:34 kronos syncthing[2836]: [35K66] INFO: syncthing v0.12.19 "Beryllium Bedbug" (go1.5.3 linux-amd64) builduser@svetlemodry 2016-02-14 19:26:33 UTC
This system service has to be located in "/etc/systemd/system/syncthing-resume.service",
and for packages in "/usr/lib/systemd/system/syncthing-resume.service". It can be
enabled using "systemctl enable syncthing-resume.service".
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Fixes#2151.
Since Walk.walkAndHashFiles ignores .stfolder and .stignore, they will
never be found by fs.Get(protocol.LocalDeviceID, sub) in
Model.internalScanFolder. As a result, when asked to scan those subs
we end up scanning the whole folder.
This reverts the change introduced in 9b9fe0d Reduce scanning effort.
That commit caused us to automatically ignore the basename of the
specified subs and instead scan closest known root folder. For
example, in a folder that looks like:
Sync/
├── 00
│ ├── one
│ ├── three
│ └── two
├── 01
│ ├── one
│ ├── three
│ └── two
├── 02
│ ├── one
│ ├── three
│ └── two
└── one
calling '/rest/db/scan?folder=default&sub=01' called filepath.Walk on
the whole Sync/ folder instead of just the desired subfolder. This
contradicts the scan behavior promised by the documentation.
This is related to #2151.
