[Bug 1567695] [NEW] mysql-server-5.7.postinst is influenced by $HOME, causing installation hangs

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Related bug: bug 1567696. This bug is to track that we are influenced by
$HOME, not specifically .my.cnf.

mysql-server-5.7 version: 5.7.11-0ubuntu4

Steps to reproduce:

As normal user:

cat > ~/.my.cnf <<EOT
[client]
user = root
password = foo
EOT

sudo apt-get install -y mysql-server-5.7

Every time (three times) it prompts for a root password, just press
Enter (ie. set a blank password).

Expected behaviour: apt-get finishes.

Actual behaviour:

mysql-server-5.7.postinst hangs on:

update-alternatives: using /etc/mysql/mysql.cnf to provide
/etc/mysql/my.cnf (my.cnf) in auto mode

/var/log/mysql/error.log reports:

2016-04-07T23:12:37.299093Z 0 [Note] Execution of init_file '/var/lib/mysql-files/tmp.LTuPIaNrV0' started.
2016-04-07T23:12:37.299499Z 1 [ERROR] 1524  Plugin 'auth_socket' is not loaded
2016-04-07T23:12:37.299577Z 0 [Note] Execution of init_file '/var/lib/mysql-files/tmp.LTuPIaNrV0' ended.
2016-04-07T23:12:37.299631Z 0 [Note] mysqld: ready for connections.
Version: '5.7.11-0ubuntu5'  socket: '/tmp/tmp.FFBBqKBiRF/mysqld.sock'  port: 3306  (Ubuntu)

Workaround:

unset HOME in the postinst fixes it.

Comments:

There may be a second bug here, which is that the postinst is influenced
by a ~/.my.cnf. What happens if ~root/.my.cnf does something similar?

** Affects: mysql-5.7 (Ubuntu)
     Importance: Critical
         Status: Triaged


** Tags: mysql-5.7-transition patch
-- 
mysql-server-5.7.postinst is influenced by $HOME, causing installation hangs
https://bugs.launchpad.net/bugs/1567695
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