dovecot - Jun 2019 - doveconf complains No matches on !include conf.d/* line but still writes out contents in conf.d

Further investigation shows that `doveconf` called 
`/usr/lib/dovecot/managesieve` which in return calls `doveconf` again, 
but with another uid (possible? I'm not sure) and a few extra arguments, 
which causes a call to `glob` in 
`src/config/config-parser.c:settings_include` to fail with `GLOB_NOMATCH`.

I'd be appreciate if anyone can provide information on suspicious 
permission-relating operation that `managesieve` does before calling 
`doveconf`.

 ?I just can't find a way to post reply on previous mails, so I decided 
to post a new one. The original text follows.

On 2019/6/6 3:15, Ben Ma wrote:
> I'm on dovecot 2.3.3 (dcead646b). Output of `dovecot -n`:
>
> # 2.3.3 (dcead646b): /etc/dovecot/dovecot.conf # Pigeonhole version 
> 0.5.3 (f018bbab) doveconf: Fatal: Error in configuration file 
> /etc/dovecot/dovecot.conf line 98: No matches doveconf: Error: 
> managesieve-login: dump-capability process returned 89 doveconf: 
> Fatal: Error in configuration file /etc/dovecot/dovecot.conf line 98: 
> No matches
>
> While line 98 of dovecot.conf is just "!include conf.d/*.conf".
>
> Output of `doveconf -n`:
>
> # 2.3.3 (dcead646b): /etc/dovecot/dovecot.conf # Pigeonhole version 
> 0.5.3 (f018bbab) doveconf: Fatal: Error in configuration file 
> /etc/dovecot/dovecot.conf line 98: No matches doveconf: Error: 
> managesieve-login: dump-capability process returned 89 # OS: Linux 
> 4.12.14-lp151.28.4-default x86_64 # Hostname: XXX doveconf: Error: 
> t_readlink(/var/run/dovecot/dovecot.conf) failed: readlink() failed: 
> No such file or directory namespace inbox { ............. (Removed for 
> simplicity) } ssl = required ssl_cert = 
> </etc/postfix/ssl/certs/phys.cer ssl_options = no_compression 
> ssl_prefer_server_ciphers = yes userdb {?? driver = passwd }
>
> It's strange that all the extra content (especially ssl conf) only 
> occurs in conf.d/10-ssl.conf.
>
> To dig on what's happening underneath I ran `strace doveconf -n
2>&1
> |egrep "\.conf|conf\.d"` and got:
>
> write(1, "# 2.3.3 (dcead646b): /etc/doveco"..., 47# 2.3.3
(dcead646b):
> /etc/dovecot/dovecot.conf openat(AT_FDCWD, 
> "/etc/dovecot/dovecot.conf", O_RDONLY) = 7 wait4(-1, doveconf:
Fatal:
> Error in configuration file /etc/dovecot/dovecot.conf line 98: No 
> matches open("/etc/dovecot/conf.d", 
> O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 8 openat(AT_FDCWD, 
> "/etc/dovecot/conf.d/90-sieve.conf", O_RDONLY) = 8 ............. 
> (Removed for simplicity) openat(AT_FDCWD, 
> "/etc/dovecot/conf.d/10-ssl.conf", O_RDONLY) = 20
openat(AT_FDCWD,
> "/etc/dovecot/conf.d/10-auth.conf", O_RDONLY) = 25 
> stat("/etc/dovecot/conf.d/auth-system.conf.ext", 
> {st_mode=S_IFREG|0644, st_size=2182, ...}) = 0 openat(AT_FDCWD, 
> "/etc/dovecot/conf.d/auth-system.conf.ext", O_RDONLY) = 26 
> stat("/etc/dovecot/local.conf", 0x7ffd94664760) = -1 ENOENT (No
such
> file or directory) stat("/etc/resolv.conf",
{st_mode=S_IFREG|0644,
> st_size=709, ...}) = 0 open("/etc/host.conf", O_RDONLY|O_CLOEXEC)
= 7
> read(7, "#\n# /etc/host.conf - resolver co"..., 4096) = 370 
> open("/etc/resolv.conf", O_RDONLY|O_CLOEXEC) = 7 read(7,
"###
> /etc/resolv.conf is a symlin"..., 4096) = 709 
> readlink("/var/run/dovecot/dovecot.conf", 0x5555db302598, 128) =
-1
> ENOENT (No such file or directory) write(2, "doveconf: Error: 
> t_readlink(/var"..., 112doveconf: Error: 
> t_readlink(/var/run/dovecot/dovecot.conf) failed: readlink() failed: 
> No such file or directory
>
> It seems that files in conf.d is never read before doveconf's 
> complaint! I have totally no idea why this happens. Any help? 
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