[Dovecot] stats + fts squat plugins, indexer-worker error on message indexing

[David Warden]

On Apr 25, 2012, at 10:43 AM, Timo Sirainen wrote:

> On 25.4.2012, at 17.20, David Warden wrote:
> 
>> Apr 25 09:56:26 wardentest3 dovecot: service=indexer-worker user=warden rip= Error: open(/proc/self/io) failed: Permission
> ..
>> Based on http://wiki2.dovecot.org/Services#indexer-worker it seems like this is because the indexer-worker process is created as root but at the time of indexing the indexer-worker drops privs to the mail user. In /proc/<indexer-worker pid>/, io is mode 0400 and owned by root, so it makes sense that the mail user would be unable to read that file.
> 
> Does the attached patch fix it?
> 
> <diff>

The error is still logged, but is that intentional on your part? It looks like the patch logs the failure to open() when the error returned is anything other than ENOENT and in my case the error is EACCESS. Other than that it looks like it correctly disables accessing that file.

>> The strange thing is it looks like the stats are still collected (unless I am reading the output of the stats dump incorrectly):
>> 
>> [root at wardentest3 mailtest]# doveadm stats dump -s /var/run/dovecot/mailtest/stats command user=warden
>> cmd	args	session	user	last_update	user_cpu	sys_cpu	min_faults	maj_faults	vol_cs	invol_cs	disk_input	disk_output	read_count	read_bytes	write_count	write_bytes	mail_lookup_path	mail_lookup_attr	mail_read_count	mail_read_bytes	mail_cache_hits
>> select	inbox	27fb87218302984f084c0000ae899e04	warden	1335362182.950250	0.000000	0.000000	172	0	46	0	0	12288	13	7883	4	381	0	0	0	0	0
>> search	text "warden"	27fb87218302984f084c0000ae899e04	warden	1335362186.588023	0.001000	0.000000	32	0	4	1	0	0	4	108	1	43	0	0	0	0	0
>> logout		27fb87218302984f084c0000ae899e04	warden	1335362189.161790	0.000000	0.000000	1	0	0	3	0	0	1	108	3	157	0	0	0	0	0
> 
> These are IMAP command statistics. The problem was only with indexer-worker.