Hi,
I am running postfix 3.8.4 on FreeBSD 14.0-STABLE and recompile postfix (and
all my other ports) on a regular basis (by poudriere).
Very recently I re-enabled IPv6 on my servers, and removed my
'inet_protocols=ipv4' from main.cf and did *not* add 'inet_protocols=all'
because I checked for the default setting:
mail> postconf -d inet_protocols
inet_protocols = all
Thus, my main.cf lacks *any* inet_protocols setting!
Today, I had to recompile and reinstall all of my ports (ABI change), and
found, that 'inet_protocols=ipv4' has been added to main.cf?!
I found https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263813 and there
https://github.com/vdukhovni/postfix/blob/master/postfix/conf/post-install
'post-install' tells me:
# Postfix 2.9.
# Safety net for incompatible changes in IPv6 defaults.
# PLEASE DO NOT REMOVE THIS CODE. ITS PURPOSE IS TO AVOID AN
# UNEXPECTED DROP IN PERFORMANCE AFTER UPGRADING FROM POSTFIX
# BEFORE 2.9.
# This code assumes that the default is "inet_protocols = ipv4"
# when IPv6 support is not compiled in. See util/sys_defs.h.
test "`$POSTCONF -dh inet_protocols`" = "ipv4" ||
test -n "`$POSTCONF -c $config_directory -n inet_protocols`" || {
cat <<EOF | ${FMT}
COMPATIBILITY: editing $config_directory/main.cf, setting
inet_protocols=ipv4. Specify inet_protocols explicitly if you
want to enable IPv6.
In a future release IPv6 will be enabled by default.
EOF
$POSTCONF -c $config_directory inet_protocols=ipv4 || exit 1
}
During poudriere's postfix compilation this script is used, and thus my main.cf
has became modified.
I do not complain, I do want to understand the rationale behind this behaviour.
#) Shouldn't that "safety net" only being applied while upgrading to 3.9 and
not recompiling 3.8.4?
#) Why is the default of inet_protocol 'all' ignored if not found in main.cf?
FTR: If I do add 'inet_protocols=all' into my main.cf, nothing becomes changed
by post-install (my workaround for the time being).
Again, no complaints, I do only want to understand it, and/or become taught
about my mistaken thinking.
Thanks in advance and regards,
Michael
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