[Users] [Bug 4431] New: Mails on shared MH storage are invisible from other login

[noreply at thewildbeast.co.uk]

https://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4431

            Bug ID: 4431
           Summary: Mails on shared MH storage are invisible from other
                    login
           Product: Claws Mail
           Version: 3.16.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P3
         Component: Folders/MH
          Assignee: users at lists.claws-mail.org
          Reporter: mnieuw at zap.a2000.nl

Environment: Main mail directory on separate ext4 data partition. Mint 19.2
XFCE, Claws 3.16.0, CPU AMD Phenom, ECC ram. Separate mail users are members of
the same group.

After running "sudo chmod -R g+s . " on the main Mail folder and doing a "ls
-alrt" in the inbox, all files show as -rw-rwS--- . Good.

Then, getting new mail from the server and doing "ls -alrt" again shows:

rw-rwS---  1 eri  homeusers    19547 Jan 25 10:44 10672
drwxrwsr-x 21 root homeusers     4096 Jan 25 13:32 ..
-rw-rw----  1 mat  homeusers    14142 Jan 25 13:38 10679
-rw-rw----  1 mat  homeusers    94765 Jan 25 13:38 10678
-rw-rw----  1 mat  homeusers    62815 Jan 25 13:38 10677
-rw-rw----  1 mat  homeusers    93579 Jan 25 13:38 10675
-rw-------  1 mat  homeusers    82868 Jan 25 13:39 .claws_mark
-rw-------  1 mat  homeusers  4485424 Jan 25 13:39 .claws_cache
-rw-rw-r--  1 mat  homeusers       16 Jan 25 13:39 .mh_sequences

The . claws  files do not honor the 660 chmod, and the 'S' does
not appear on any modified files. I don't know what the difference
is between a lower case 's' on the group (setgid) or the upper case 'S' .
I also do not know if the s is relevant for files.

If you then logout, login as another user of the same group, the new mails are
not visible. If you then (with Claws not running) do a "sudo chmod g+rws .*" in
that folder, and a "sudo chmod g+rws *" , then all entries show up with rws for
the group, but a restarted Claws still does not see them.

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