[Bug 1769890] [NEW] Icingaweb2 does not work with PHP 7.2

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Richard Laager (rlaager):

[Impact]
icingaweb2 does not work on PHP 7.2 or higher, e.g. as shipped in Ubuntu 18.04.

[Test Case]

Steps to reproduce:
# apt install mariadb
# mysql_secure_installation
# apt install icinga2 icinga2-ido-mysql
Yes to both questions relating to automatically set up database
# apt install icingaweb2
Point a browser at http://host.example.co.uk/icingaweb2 to run the setup wizard

Expected results:
The setup wizard loads.

Actual results:

Fatal error: Uncaught ErrorException: session_name(): Cannot change
session name when session is active in
/usr/share/php/Icinga/Web/Session/PhpSession.php:97 Stack trace: #0
[internal function]:
Icinga\Application\ApplicationBootstrap->Icinga\Application\{closure}(2,
'session_name():...', '/usr/share/php/...', 97, Array) #1
/usr/share/php/Icinga/Web/Session/PhpSession.php(97):
session_name('Icingaweb2') #2
/usr/share/php/Icinga/Web/Session/PhpSession.php(152):
Icinga\Web\Session\PhpSession->open() #3
/usr/share/php/Icinga/Web/Controller/ActionController.php(544):
Icinga\Web\Session\PhpSession->write() #4
/usr/share/php/Icinga/Web/Controller/ActionController.php(489):
Icinga\Web\Controller\ActionController->shutdownSession() #5
/usr/share/icingaweb2/library/vendor/Zend/Controller/Action.php(512):
Icinga\Web\Controller\ActionController->postDispatch() #6
/usr/share/php/Icinga/Web/Controller/Dispatcher.php(76):
Zend_Controller_Action->dispatch('errorAction') #7
/usr/share/icingaweb2/library/vendor/Zend/Controller/Front.php( in
/usr/share/icingaweb2/library/vendor/Zend/Controller/Plugin/Broker.php
on line 332

[Regression Potential]
The package is completely broken on startup now, so the regression potential is effectively nil.

[Other Info]

Upstream fix:
https://github.com/Icinga/icingaweb2/pull/3315/commits/dadd2c80f6819111f25e3799c072ec39c991897e

Backported to Debian package here:
https://salsa.debian.org/nagios-team/pkg-icingaweb2/commit/5804954da6cf08a74eeeb689d8d094eefa6ba9bc

** Affects: icingaweb2 (Ubuntu)
     Importance: Undecided
         Status: Fix Released


** Tags: bionic
-- 
Icingaweb2 does not work with PHP 7.2
https://bugs.launchpad.net/bugs/1769890
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