Bug#610918: exim4: Fails to start when kernel does not support ipv6

[Samuel Thibault]

Package: exim4
Version: 4.72-3
Severity: important

Hello,

Nowadays, the exim4 package enables listening on ipv6 by default:
/etc/exim4/update-exim4.conf.conf:
dc_local_interfaces='127.0.0.1 ; ::1'

However, this fails when the kernel does not support ipv6 (or it was
disabled thanks to ipv6.disable=1 or disable_ipv6=1):

2011-01-24 00:54:28 IPv6 socket creation failed: No such file or
directory

and if I retry to start, as well as further retries:

2011-01-24 00:55:28 IPv6 socket creation failed: Address family not
supported by protocol

exim4 should probably not completely fail when such EAFNOSUPPORT error
is returned.

Samuel

-- Package-specific info:
Exim version 4.72 #1 built 29-Dec-2010 18:56:47
Copyright (c) University of Cambridge, 1995 - 2007
Berkeley DB: Berkeley DB 4.8.30: (April  9, 2010)
Support for: crypteq iconv() IPv6 GnuTLS move_frozen_messages DKIM
Lookups: lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmnz dnsdb dsearch nis nis0 passwd
Authenticators: cram_md5 plaintext
Routers: accept dnslookup ipliteral manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore autoreply lmtp pipe smtp
Fixed never_users: 0
Size of off_t: 8
GnuTLS compile-time version: 2.8.6
GnuTLS runtime version: 2.8.6
Configuration file is /var/lib/exim4/config.autogenerated

-- System Information:
Debian Release: 6.0
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.37 (SMP w/2 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages exim4 depends on:
ii  cdebconf [debconf-2.0]        0.153      Debian Configuration Management Sy
ii  debconf [debconf-2.0]         1.5.36     Debian configuration management sy
ii  exim4-base                    4.72-3+b1  support files for all Exim MTA (v4
ii  exim4-daemon-light            4.72-3+b1  lightweight Exim MTA (v4) daemon

exim4 recommends no packages.

exim4 suggests no packages.

-- debconf information excluded