** Description changed:
+ [Impact]
+
+ If a user's /etc/postfix/main.conf has an empty alias_database setting,
+ postfix-mysql.postinst fails when upgrading.
+
+ [Test Case]
+
+ Install the previous postfix and postfix-mysql:
+
+ # apt install -y postfix=3.3.0-1 postfix-mysql=3.3.0-1
+ * Install type: Local Only
+ * System mail name: anything
+
+ Clear the alias settings in /etc/postfix/main.cf, then upgrade to the
+ latest:
+
+ # sed -i 's/\(alias_.* =\).*/\1/g' /etc/postfix/main.cf
+ # service postfix reload
+ # apt upgrade -y
+
+ You'll get the following error:
+ Adding mysql map entry to /etc/postfix/dynamicmaps.cf
+ /var/lib/dpkg/info/postfix-mysql.postinst: 33: [: =: unexpected operator
+
+
+ [Regression Potential]
+
+ The fix only affects the package installation scripts.
+
+ [Original Description]
+
I wanted to upgrade my bionic system. Some postfix related packages has
been upgraded:
# apt-get upgrade
Reading package lists... Done
- Building dependency tree
+ Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
base-files postfix postfix-ldap postfix-mysql postfix-pcre
python3-problem-report qemu-guest-agent
7 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
- # ls /var/cache/apt/archives/postfix*deb
- /var/cache/apt/archives/postfix_3.3.0-1ubuntu0.1_amd64.deb
/var/cache/apt/archives/postfix-ldap_3.3.0-1ubuntu0.1_amd64.deb
/var/cache/apt/archives/postfix-pcre_3.3.0-1ubuntu0.1_amd64.deb
- /var/cache/apt/archives/postfix-cdb_3.3.0-1ubuntu0.1_amd64.deb
/var/cache/apt/archives/postfix-mysql_3.3.0-1ubuntu0.1_amd64.deb
+ # ls /var/cache/apt/archives/postfix*deb
+ /var/cache/apt/archives/postfix_3.3.0-1ubuntu0.1_amd64.deb
/var/cache/apt/archives/postfix-ldap_3.3.0-1ubuntu0.1_amd64.deb
/var/cache/apt/archives/postfix-pcre_3.3.0-1ubuntu0.1_amd64.deb
+ /var/cache/apt/archives/postfix-cdb_3.3.0-1ubuntu0.1_amd64.deb
/var/cache/apt/archives/postfix-mysql_3.3.0-1ubuntu0.1_amd64.deb
After the installation, I saw this error message:
Setting up postfix-mysql (3.3.0-1ubuntu0.1) ...
Adding mysql map entry to /etc/postfix/dynamicmaps.cf
/var/lib/dpkg/info/postfix-mysql.postinst: 33: [: =: unexpected operator
But anyway, installation seemed to be succeeded. However, I noticed,
that according to my mail logs, all mysql based postfix tables does not
work at all with "unsupported map type". Just noticed, that even with
ldap tables, not only mysql tables ...
restarting postfix seems to cured the problem, but I think, it shouldn't
work this way ...
What I found: in /var/lib/dpkg/info/postfix-mysql.postinst the
corresponding context, where the problem is (line 33):
configure)
addmap mysql
if [ $(postconf |grep alias_database | awk '{print $3}'|awk -F \: \
'{print $1}') = 'mysql' ]; then
runnewaliases
fi
;;
I guess, the problem is the following: I have the main.cf with empty
alias_database directive, since I don't use aliases at all, so in
main.cf, I have:
# grep ^alias /etc/postfix/main.cf
- alias_maps =
- alias_database =
+ alias_maps =
+ alias_database =
# postconf |grep alias_database
alias_database =
# postconf |grep alias_database | awk '{print $3}'|awk -F \: '{print $1}'
#
So you see, because of my config, I get empty string ... And it seems
the postinst script is not prepared to have this, as the empty string is
represented in the script this way then:
if [ = 'mysql' ]; then
So it is understandable now, that I get this error:
/var/lib/dpkg/info/postfix-mysql.postinst: 33: [: =: unexpected operator
Because of the postinst script runs with "set -e", this error is
"fatal". Surely, I guess the same issue happens with postfix-ldap
package as well, I guess, maybe with others, I am not sure (postfix-
pcre, etc?).
I think, this should be fixed, since it can break things for everyone
using empty value for alias_database directive in main.cf
Though I am still not sure, why postfix thought these are unsupported
map types after the upgrade, and postfix restart cured the problem,
shouldn't the upgrade restart postfix anyway?
As a workaround, I put an empty hash map file into main.cf for with
option, now there is no error message in postinst script, but still,
it's a strange situation ...
Also, the logic in the script to "extract" table type is a bit
complicated I guess, I would use something like this:
if [ "$(postconf -h alias_database | cut -f1 -d:)" = "mysql" ]; then
....
Maybe there are better solutions than mine above, still, it's just a
quick idea (rather than multiple awk's and a grep) ....
Thanks for your attention.
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https://bugs.launchpad.net/bugs/1791139
Title:
postfix-mysql package upgrade results in server configuration error
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