/dev unreadable leads to blank page and upgrade error

[Blackclaws]

Steps to reproduce

1. Install Owncloud 9.0
2. Revoke read and execute access to /dev folder for the http user
3. Owncloud only yields a blank page
4. Install Owncloud 8.2.3
5. Revoke read and execute access to /dev folder for the http user
6. Owncloud only yields a blank page
7. On upgrade to Owncloud 9.0 via occ upgrade you get "Cannot open source device" exception

Expected behaviour

An error message telling what is wrong or just a warning saying that /dev/urandom is unavailable. This used to happen with older versions.

For the upgrade I would have expected a more verbose error message. "Cannot open source device" as it comes from mcrypt doesn't give you a lot of information.

Actual behaviour

You get a blank page or a non verbose error message. In actuality the system crashes somewhere during the retrieval of CryptoWrapper from the DepedencyInjection System

Server configuration

Operating system: Arch Linux

Web server: Nginx + PHP-FPM

Database: MariaDB

PHP version: 7.0.4

ownCloud version: (see ownCloud admin page) 8.2.3/9.0

Updated from an older ownCloud or fresh install: Updated

Where did you install ownCloud from: Arch repositories / Zip files => Same behaviour

Signing status (ownCloud 9.0 and above):

Login as admin user into your ownCloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results here.

Integrity checker has been disabled. Integrity cannot be verified.
List of activated apps:
Calendar/Contacts

(Without the database password, passwordsalt and secret)
$CONFIG = array (
'instanceid' => 'ocz1hq1sawaa',
'trusted_domains' =>
array (
redacted
),
'datadirectory' => '/usr/share/webapps/owncloud/data',
'overwrite.cli.url' => 'redacted',
'dbtype' => 'mysql',
'version' => '9.0.0.19',
'dbname' => 'owncloud',
'dbhost' => 'localhost',
'dbtableprefix' => 'oc_',
'installed' => true,
'theme' => '',
'loglevel' => 0,
'maintenance' => false,
'trashbin_retention_obligation' => 'auto',
'forcessl' => true,

**Are you using encryption:**no

[DeepDiver1975]

You get a blank page or a non verbose error message. In actuality the system crashes somewhere during the retrieval of CryptoWrapper from the DepedencyInjection System

anything in the logs?

[PVince81]

Fixed with #26075 where the exception is printed directly without template in case some base stuff like logger could not be inited yet.

[lock]

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