folder stopped/path missing when changing path the second time

TL;DR: Add / Save / Edit / Remove / Add / Change Path / Save ends up in “folder path missing” when sender not paused

Without ‘Change Path’ the error would be ‘folder marker missing’ which is expected.

In Detail: I want to share a folder ‘A’ from ST1 to ST2. After accepting I delete the shared folder in ST2 again. When it gets offered again I accept, change the path from ‘A’ to ‘B’ and ‘Save’. Immediately the accepted folder is ‘Stopped’ and an error window pops up stating “Error on folder “A” (A-folderid): folder path missing”.

‘Pause/Resume’ on ST1 immediately forces the request to pop up on ST2, so I did that.

Bug?: When I just pause ST1 ‘A’ everything works fine. I can change the destination path on ST2. Whereas when I pause/resume ST1 ‘A’ I cannot Remove/Add to a new “Folder Path”. I ends up in “folder path missing” and “Stopped”

Steps:

Two vanilla syncthing ( ST1 and ST2 ) connected to each other:

ST1 offers to share its ‘A’ folder with ST2:

On ST2 I accept the offer by pressing “Add”:

Without changing anything I press “Save”:

So far, so good. ST1/A and ST2/A are in sync.

Now I want to change the destination folder on ST2 from ‘A’ to non existent ‘B’.

‘Remove’ folder ‘A’ in ST2. Open A:

‘Edit’ A:

‘Remove’

‘Yes’

Now it looks like as if A never existed.

‘Pause All’ on ST1… BANG! ST1 wants to share on ST2

‘Resume All’ on ST1

‘Add’ on ST2 to add new folder:

change “Folder Path” from A to B

‘Save’

Now Folder A gets ‘Stopped’ …

and a few seconds later the error pops up:

“Error on folder “A” (A-folderid): folder path missing”

Notes:

To enforce “ST1 wants to share …” on ST2 it helps to “Pause” the folder on ST1. If the folder is not resumed I am able to change the destination folder: As long as ST1 is paused, I am able to change A to B and sync. Weird.

Setup:

2 x local running syncthing, silenced by manually editing config.xml to prevent discovery, ur, announcement, broadcasting etc etc.

$PREFIX = current working dir

ST1 - listening on 127.0.1.1:8384 - --home = $PREFIX/st1-home - defaults folder path $PREFIX/st1-default - to be shared folder $PREFIX/st1-default/A with FolderID ‘A-folderid’

ST2 - listening on 127.0.2.1:8384 - --home = $PREFIX/st2-home - defaults folder path $PREFIX/st2-default

2x Chrome/Brave on http://127.0.1.1:8384/# and http://127.0.2.1:8384/#

2x xterm with ‘tail -F st[12].log’

both syncthings married via syncthing cli config device add

helper script usage:

./testbug.sh init  # setup & start two married syncthings
./testbug.sh test  # create folder on ST1 and offer to ST2
./testbug.sh cleanup # stop syncthings and delete logs, config and data
./testbug.sh stop  # stop syncthings

testbug.sh (4.3 KB)

Logfiles:

st1.log (156.2 KB)

st2.log (248.2 KB)

Index/Config/Logs/Screendumps:

syncthingtest.tar.gz (3.3 MB)

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