Bug report: Sync ignores Linux group permissions

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I want to sync a folder which has the owner:group root:system and the permissions drwxrwxr-x (775).

I've edited /lib/systemd/system/resilio-sync.service to run sync as user:group rslsync:system.

I've edited /etc/passwd so tha the user rslsync has the group system.

I've made a systemctl daemon-reload and a systemctl restart resilio-sync.

Sync runs but won't write to the folder and says it has no permission.

When I login as user rslsync I can obviously write to the folder because I have sufficient group permissions.

Only when I change the owner of the folder to rslsync Sync can write to that folder.


Ubuntu 18.04.2 LTS and Resilio Sync 2.6.3 installed with apt.

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Update on further research:

Changing the permissions to 777 has no effect.

After changing the owner to rslsync and accessing the folder with Sync I can change the owner back to root and Sync can still access the folder. So probably Sync has some kind of internal database where it stores assumed permissions?

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