Shutdown computer when sync is done

Howto
1

When a change happens in my folder I will trigger a wake up action (WoL or other way) to the remote device so that sync starts (ST yet setup as a service)

On remote side I think I’d use a cron hourly to run a script that detects sync is done then shutdown the pc.

I read doc and found rest/db/completion but they say its expensive. There is also /rest/events?events=FolderCompletion but it may happens that no change is needed in the folder since last startup… so if IUC the event will not rise.

What’s the best way please. Thanks

3

I sometimes have the same use case therefore included this into syncthingctl, e.g.:

syncthingctl wait-for-idle --dir foo && systemctl poweroff

This tool is developed within the Syncthing Tray project. The --help for wait-for-idle looks like this:

wait-for-idle, -w
  waits until the specified dirs/devs are idling
  --dir, -d [ID]
    specifies a directory by ID
  --dev [ID/name]
    specifies a device by ID or name
  --all-dirs
    applies the operation for all directories
  --all-devs
    applies the operation for all devices
  --at-least, -a [number]
    specifies for how many milliseconds Syncthing must idle (prevents exiting too early in case of flaky status)
  --timeout, -t [number]
    specifies how many milliseconds to wait at most

  example: syncthingctl wait-for-idle --timeout 1800000 --at-least 5000 && systemctl poweroff
           syncthingctl wait-for-idle --dir dir1 --dir dir2 --dev dev1 --dev dev2 --at-least 5000

Within this tool I use the regular REST API routes to query the initial state and the event API to be notified about changes. So the “expensive” routes are only used initially/once. I think that answers your question regarding the API usage.

syncthingctl is only about local completion (of course one can simply connect to a remote instance with the --url parameter). But for the UI I also implemented notifications for remote folders. When I remember correctly, I’ve used the db/completion route to query the remove completion and the RemoteIndexUpdated event to know when it might have changed and needs to be queries again.

3 Likes
API: Check when sync is "finished"? LocalIndexUpdated false positive?
4

Many thanks guys. I’ll test this stuff, I think it will be easy for me as the folder in remote device I want to shutdown is “Receive only” and will never be paused.

5

rest/db/completion was wrong as it always returns "completion": 0, against our device + folder whatever Up to Date or Syncing.

Instead rest/db/need does the job for me :slight_smile: :

curl -k -X GET -H "X-API-Key: myAPIkey" 'https://localhost:8384/rest/db/need?folder=myFol-derID'
{
 "page": 1,
 "perpage": 65536,
 "progress": [],
 "queued": [],
 "rest": []
}

With some scripting touch /path/AutoOff.sh && chmod +x /path/AutoOff.sh

#!/bin/bash
sleep 60 >/dev/null 2>&1 #give some time to ST to connect
curl -ks -X GET -H "X-API-Key: myAPIkey" "https://localhost:8384/rest/db/need?folder=myFol-derID"|grep size >/dev/null 2>&1 #"size" is in curl output only when there is something left to sync
if [[ $? = 1 ]]; then /sbin/shutdown >/dev/null 2>&1
fi

running from root’s crontab */15 * * * * /path/AutoOff.sh >/dev/null 2>&1

6

In the end I did it myself