Today I had to install postfix again, but manually (entering apt-get install on
commandline) and saw in the console output the following lines:
setting inet_interfaces: loopback-only
This reminded me of this issue and gave me a clue where the problem is.
I think the problem is not directly with debconf but with the postinst
script in the package. It contains the following lines:
db_get postfix/main_mailer_type && mailer="$RET"
if [ "$mailer" != "No configuration" ]; then
db_fget postfix/main_mailer_type changed
if [ "$RET" = "true" ]; then
echo "setting inet_interfaces: $val"
set_postconf "inet_interfaces=$val"
I checked on our production server and as expected, postfix/main_mailer_type
has no value:
$ debconf-get-selections | grep postfix/main_mailer_type
postfix postfix/main_mailer_type select
$
I think this script should be patched to support empty values and treat
them as "dont change any configuration at all", since no value means the
user did not even choose any option, so doesn't want the package to
configure the mail server.
** Package changed: puppet (Ubuntu) => postfix (Ubuntu)
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https://bugs.launchpad.net/bugs/1027061
Title:
Postfix upgrade to 2.9.3-2~12.04.1 changes configuration files
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