[Dovecot] Dsync error: Couldn't drop privileges: getgrnam

[Alan McGinlay - SICS]

On 2013-12-10 14:25, Alan McGinlay - SICS wrote:
> On 2013-12-10 14:09, Alan McGinlay - SICS wrote:
> On 2013-12-10 11:52, Alan McGinlay - SICS wrote:
> On 2013-12-10 11:34, Robert Schetterer wrote:
> Am 10.12.2013 11:25, schrieb Alan McGinlay - SICS:
> On 2013-12-09 11:21, Alan McGinlay - SICS wrote:
> On 2013-12-08 22:08, Alan McGinlay - SICS wrote:
> Actually I do, /var/vmail (contains virtual domain mailboxes) is
> owned by vmail:vmail
> 
> On 2013-12-08 21:49, Timo Sirainen wrote:
> On 5.12.2013, at 22.18, Alan McGinlay - SICS <alanm at sics.se> wrote:
> 
> mail_privileged_group = vmail
> ..
> mail_location = maildir:~/Maildir
> ..
> dsync(alantestuser at whatever.com): Error: user
> alantestuser at whatever.com: Couldn't drop privileges: getgrnam(vmail)
> failed: No such file or directory (in mail_privileged_group setting)
> 
> You don’t have vmail group in your system? Either create it or remove
> this setting. Most likely you want to remove it, since this setting
> was meant only for mbox format, while you’re using maildir.
> 
> After much trial and error and following Timos advice, I managed to
> get a sync to at least start and it lists folders, then it starts
> spamming this:
> 
> dsync(alantestuser at whatever.com): Error:
> safe_mkstemp(/tmp/dovecot.doveadm.) failed: No such file or directory
> dsync(alantestuser at whatever.com): Error:
> safe_mkstemp(/tmp/dovecot.doveadm.) failed: No such file or directory
> dsync(alantestuser at whatever.com): Error:
> safe_mkstemp(/tmp/dovecot.doveadm.) failed: No such file or directory
> ...
> 
> /tmp/dovecot.doveadm. does indeed not exist but I can't find any
> reference to it online or in the docs,
> 
> Any ideas?
> 
> 
> Still not able to get anywhere with this :( It really feels like a
> permissions problem, either with the master user, the unix user i 
> start
> the dsync with (root) or the user that dsync runs as (vmail). I tried
> looking at the code for safe_mkstemp but still couldn't work out the
> source of this problem. If anyone has an idea it would be great to 
> hear it!
> 
> perhaps check
> the dsync target directory must be writable by vmail:vmail
> 
> 
> Best Regards
> MfG Robert Schetterer
> 
> Thanks, vmail:vmail owns all mail and parent directories up to
> /var/vmail/. I tried changing mail_temp_dir in 10-mail.conf from /tmp/
> to /var/vmail/tmp (and i created that directory) but it made no
> difference apart from changing the directory in the "safe_mkstemp"
> error message. If I comment out mail_temp_dir then the error changes
> to:
> 
> dsync(alantestuser at whatever.com): Error:
> safe_mkstemp(/tmp/dovecot.doveadm.) failed: Permission denied
> dsync(alantestuser at whatever.com): Error:
> stat(/tmp/dovecot.doveadm.3c303c239d223495) failed: Permission denied
> 
> Interestingly, the synchronization actually does seem to work! I
> hadn't noticed at first but in spite of the error, mails are synced
> across and seemingly are completely intact!
> 
> It would be really good to find out the source of this error though!
> 
> /A
> 
> Another update, only about 1900 of 25000~ mails are actually copied :/

Can't believe I'm the only one with this error, googled it and there is 
nothing. Sorry to whine but I am getting desperate here!

I have upgraded to dovecot 2.1.7 but am still getting this error when 
performing a dsync:

Error: safe_mkstemp(/var/vmail/tmp/dovecot.doveadm.) failed: No such 
file or directory

It seems to fire that error only on some mails being synced but it's 
apparently random. If there are a lot of new mails then it gives that 
error a lot, if only one or two mails have come in since the last sync 
then it might give that error for both, one or none of them.

If i change the dsync command to mirror instead of backup then the 
output becomes:

Error: safe_mkstemp(/var/vmail/tmp/dovecot.doveadm.) failed: No such 
file or directory
Error: Couldn't create temp file
Error: Can't save message to mailbox DNS: Internal error occurred. 
Refer to server log for more information. [2013-12-12 13:16:46]
Error: msg-get failed: box=Junk uid=87595 guid=
Error: msg-get failed: box=Junk uid=87596 guid=
Error: msg-get failed: box=Junk uid=87597 guid=
Error: msg-get failed: box=Junk uid=87598 guid=
Error: msg-get failed: box=Junk uid=87599 guid=
Error: msg-get failed: box=Drafts uid=1339 guid=
Warning: Mailbox changes caused a desync. You may want to run dsync 
again.


syslog, mail.log and mail.err contain nothing except the master user 
logging in / out and no errors or warnings. Debug is enabled in 
10-logging.conf.

Please help!