[Bug 1023550] [NEW] Postfix missing libresolv in chroot jail

[Hauke Duden]

Public bug reported:

This is with Postfix 2.9.1-5 on Ubuntu 12.04 LTS

--- Setup to reproduce

- Configure postfix to use mysql for virtual alias maps
- Specify a DNS hostname instead of an IP address or localhost for "hosts:"

--- Symptoms:

All postfix mail routing actions fail. The log contains:

postfix/trivial-rewrite[20176]: warning: connect to mysql server my.example.com: Unknown MySQL server host 'my.example.com' (2)
warning: mysql:/etc/postfix/mysql-virtual_aliases.cf: table lookup problem
warning: virtual_alias_domains lookup failure

The same configuration works fine if you specify an IP address instead
of a DNS hostname.

--- Cause:

libresolv is missing from the postfix chroot jail. That causes the mysql
client library used by postfix to not be able to resolve any DNS names.

--- Workaround:

sudo cp -p /lib/x86_64-linux-gnu/libresolv* /var/spool/postfix/lib/x86_64-linux-gnu/
sudo postfix restart

--- Expected fix:

Fix the postfix installation routines to include libresolv in the chroot jail.
I do not know enough about this to provide a ready-made patch, unfortunately.

** Affects: postfix (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Postfix missing libresolv in chroot jail

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