[Bug 530323] [NEW] resolvconf update script should not produce error when main.cfg missing

[Simon Huerlimann]

Public bug reported:

Binary package hint: postfix

I'm using a 9.10 server installation. The following happens as postfix
got installed as an indirect dependency of ubuntu-vm-builder. resolvconf
has been installed manually.

When running ifup/ifdown the following errors are shown:

 /usr/sbin/postconf: fatal: open /etc/postfix/main.cf: No such file or directory
 cp: `/etc/resolv.conf' and `/etc/resolv.conf' are the same file                
 run-parts: /etc/resolvconf/update-libc.d/postfix exited with return code 1     
 run-parts: /etc/resolvconf/update.d/libc exited with return code 1             
 run-parts: /etc/network/if-down.d/resolvconf exited with return code 1         

It is correct, that no /etc/postfix/main.cf exists, but this is an
irrelevant information when doing network interface maintenance. I thus
propose to simply enhance the the check in /etc/resolvconf/update-
libc.d/postfix from

 [ -x /usr/sbin/postconf ] || exit 0

to

 [ -x /usr/sbin/postconf -a -e /etc/postfix/main.cf] || exit 0

Even better would be to also detect major postfix configuration problems
by testing '/usr/sbin/postconf -h queue_directory' for empty result.

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

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resolvconf update script should not produce error when main.cfg missing
https://bugs.launchpad.net/bugs/530323
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