[exim] exim maildirsize quota calculation in the face of sym…

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Συντάκτης: Maarten van Baarsel
Ημερομηνία:  
Προς: exim-users
Αντικείμενο: [exim] exim maildirsize quota calculation in the face of symlinks
Hi,

I'm using Exim 4.90.1 on an Ubuntu 18.04 machine with dovecot 2.2.33 as
IMAP server.

Currently, I'm also using a plugin in dovecot:

https://wiki.dovecot.org/Plugins/MailboxAlias

to make sure the users with different names for the Sent and Trash
folder ("Verzonden items", "Deleted Messages") see the same name between
different user agents.

However, this plugin solves the alias problem with a symlink in the
Maildir directory, which makes Exim count the mails twice when the
appendfile transport is calculating quota sizes.


I managed to grab part of an exim -d+all delivery when a user was over
quota:

10:50:48 18038 maildir_compute_size: path=/var/mail/virtual/cobergh.nl/cynthias.2097/Maildir/.Sent
10:50:48 18038 sum=2466048922 filecount=8701 timestamp=1644486536
[...]
10:50:48 18038 maildir_compute_size: path=/var/mail/virtual/cobergh.nl/cynthias.2097/Maildir/.Sent Messages
10:50:48 18038 sum=2466048922 filecount=13088 timestamp=1644486536

and sure enough, one of these directories is a symlink to the other:

root@mx-1:/var/spool/mail/virtual/cobergh.nl/cynthias.2097/Maildir# ls -asF  | fgrep .Sent
    4 .Sent/
    0 .Sent Messages@


root@mx-1:/var/spool/mail/virtual/cobergh.nl/cynthias.2097/Maildir# stat .Sent\ Messages
   File: .Sent Messages -> .Sent
   Size: 5             Blocks: 0          IO Block: 4096   symbolic link
[...]




I was surprised by the symlink behaviour so I'm reconsidering the use of
the dovecot plugin, but I still wanted to ask whether this behaviour is
considered OK. I've read the appendfile docs and I could find anything
explicit about symlinks.


the transport part of the config:


virtual_delivery:
   driver          = appendfile
   # let op: geen spatie voor de \ want dat wordt ".../Maildir "
   directory       = /var/mail/virtual/$domain/${sg{$local_part}{/}{-}}.${extract{user_id}{$address_data}}/Maildir\
                     ${if bool{$acl_m_mailIsSpam}\
                          {${if match_domain{$acl_m_connectionDomainname}{+martin_domains}\
                                {}\
                                {/.Junk}\
                            }\
                          }\
                          {${if ! or{ {eq{$address_file}{}} {eq{$address_file}{inbox}}}\
                                {/.${sg{$address_file}{/}{-}}}\
                                {}\
                            }\
                          }\
                     }
   directory_mode  = 2750
   mode            = 0640
   user            = ${extract{uid}{$address_data}}
   group           = mail
   maildir_tag     = ",S=$message_size,W=$message_size"
   headers_remove  = Lines:Content-Length:Status:X-IMAP:X-IMAPbase:X-Keywords:X-Status:X-UID:X-UIDL
   headers_add     = "Lines: $body_linecount"
   use_crlf
   maildir_format
   create_directory
   delivery_date_add
   envelope_to_add
   return_path_add


   #quota opties
   quota                         = ${extract{quotum}{$address_data}}
   quota_size_regex              = S=(\d+)
   quota_is_inclusive            = false
   maildir_quota_directory_regex = ^(?:cur|new|\.(?!Trash).*)$
   quota_warn_threshold          = 95%
   quota_warn_message            = MSG_QUOTA
   maildir_use_size_file



thanks,
Maarten.