Write permissions will be overwritten by anonymous read-only permissions

[VergilGao]

If I configure both -a "@/path1, /path2" and -a "admin:123456@/:rw" at the same time, then admin's access rights to files in the /path1 directory will become readonly.
I can use -a "admin:123456@/:rw, /path1:rw, path2:rw" to fix this.

[sigoden]

Why did this happen?

The anonymous auth paths will be merged with user auth paths.
-a admin:123456@/:rw -a @/path1,/path2 will expand to -a admin:123456@/:rw,/path1,/path2 -a @/path1,/path2

Since dufs supports auth precedule (#325), so the perm of /path1,/path2 is read-only.

How to improve

After you reported this issue, we noticed that this is not a good design. We can download /path1, make some change, then re-upload /path1 to bypass this limitation.

So we need to make adjustments: A parent path with higher permissions can shadow a child path with lower permissions.

/:rw,/path1 will expand to /:rw, but /,/path1:rw will remain unchanged.