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The upside of down catastrophe, creativity, and the renewal of civilization

by Homer-Dixon, Thomas F
Published 2006

Boek

Whoops! There was an error.

Whoops \ Exception \ ErrorException (E_WARNING)

fopen(/tmp/vufind_sessions/sess_adlfadaocf1ko15k3lkr6dbaje): failed to open stream: No space left on device

Whoops\Exception\ErrorException thrown with message "fopen(/tmp/vufind_sessions/sess_adlfadaocf1ko15k3lkr6dbaje): failed to open stream: No space left on device" Stacktrace: #5 Whoops\Exception\ErrorException in /usr/local/vufind/module/VuFind/src/VuFind/Session/File.php:153 #4 fopen in /usr/local/vufind/module/VuFind/src/VuFind/Session/File.php:153 #3 VuFind\Session\File:saveSession in /usr/local/vufind/module/VuFind/src/VuFind/Session/AbstractBase.php:195 #2 VuFind\Session\AbstractBase:write in [internal]:0 #1 session_write_close in /usr/local/vufind/vendor/zendframework/zend-session/src/SessionManager.php:236 #0 Zend\Session\SessionManager:writeClose in [internal]:0

Stack frames (6)

Whoops\Exception\ErrorException

…/module/VuFind/src/VuFind/Session/File.php153

fopen

…/module/VuFind/src/VuFind/Session/File.php153

VuFind\Session\File saveSession

…/module/VuFind/src/VuFind/Session/AbstractBase.php195

VuFind\Session\AbstractBase write

[internal]0

session_write_close

…/vendor/zendframework/zend-session/src/SessionManager.php236

Zend\Session\SessionManager writeClose

[internal]0

/usr/local/vufind/module/VuFind/src/VuFind/Session/File.php

        foreach (glob($this->getPath() . "/sess_*") as $filename) {
            if (filemtime($filename) + $maxlifetime < time()) {
                unlink($filename);
            }
        }
        return true;
    }
 
    /**
     * A function that is called internally when session data is to be saved.
     *
     * @param string $sess_id The current session ID
     * @param string $data    The session data to write
     *
     * @return bool
     */
    protected function saveSession($sess_id, $data)
    {
        $sess_file = $this->getPath() . '/sess_' . $sess_id;
        if ($fp = fopen($sess_file, "w")) {
            $return = fwrite($fp, $data);
            fclose($fp);
            if ($return !== false) {
                return true;
            }
        }
        // If we got this far, something went wrong with the file output...
        // It is tempting to throw an exception here, but this code is called
        // outside of the context of exception handling, so all we can do is
        // echo a message.
        echo 'Cannot write session to ' . $sess_file . "\n";
        return false;
    }
}

/usr/local/vufind/module/VuFind/src/VuFind/Session/File.php

        foreach (glob($this->getPath() . "/sess_*") as $filename) {
            if (filemtime($filename) + $maxlifetime < time()) {
                unlink($filename);
            }
        }
        return true;
    }
 
    /**
     * A function that is called internally when session data is to be saved.
     *
     * @param string $sess_id The current session ID
     * @param string $data    The session data to write
     *
     * @return bool
     */
    protected function saveSession($sess_id, $data)
    {
        $sess_file = $this->getPath() . '/sess_' . $sess_id;
        if ($fp = fopen($sess_file, "w")) {
            $return = fwrite($fp, $data);
            fclose($fp);
            if ($return !== false) {
                return true;
            }
        }
        // If we got this far, something went wrong with the file output...
        // It is tempting to throw an exception here, but this code is called
        // outside of the context of exception handling, so all we can do is
        // echo a message.
        echo 'Cannot write session to ' . $sess_file . "\n";
        return false;
    }
}

/usr/local/vufind/module/VuFind/src/VuFind/Session/AbstractBase.php

        // Anecdotal testing Today and Yesterday seems to indicate destroy()
        //   is called by the garbage collector and everything is good.
        // Something to keep in mind though.
        return true;
    }
 
    /**
     * Write function that is called when session data is to be saved.
     *
     * @param string $sess_id The current session ID
     * @param string $data    The session data to write
     *
     * @return bool
     */
    public function write($sess_id, $data)
    {
        if ($this->writesDisabled) {
            return true;
        }
        return $this->saveSession($sess_id, $data);
    }
 
    /**
     * A function that is called internally when session data is to be saved.
     *
     * @param string $sess_id The current session ID
     * @param string $data    The session data to write
     *
     * @return bool
     */
    abstract protected function saveSession($sess_id, $data);
}

[internal]

/usr/local/vufind/vendor/zendframework/zend-session/src/SessionManager.php

     *
     * @return void
     */
    public function writeClose()
    {
        // The assumption is that we're using PHP's ext/session.
        // session_write_close() will actually overwrite $_SESSION with an
        // empty array on completion -- which leads to a mismatch between what
        // is in the storage object and $_SESSION. To get around this, we
        // temporarily reset $_SESSION to an array, and then re-link it to
        // the storage object.
        //
        // Additionally, while you _can_ write to $_SESSION following a
        // session_write_close() operation, no changes made to it will be
        // flushed to the session handler. As such, we now mark the storage
        // object isImmutable.
        $storage  = $this->getStorage();
        if (! $storage->isImmutable()) {
            $_SESSION = $storage->toArray(true);
            session_write_close();
            $storage->fromArray($_SESSION);
            $storage->markImmutable();
        }
    }
 
    /**
     * Attempt to set the session name
     *
     * If the session has already been started, or if the name provided fails
     * validation, an exception will be raised.
     *
     * @param  string $name
     * @return SessionManager
     * @throws Exception\InvalidArgumentException
     */
    public function setName($name)
    {
        if ($this->sessionExists()) {
            throw new Exception\InvalidArgumentException(
                'Cannot set session name after a session has already started'

[internal]

Environment & details:

GET Data

Key	Value
author	Homer-Dixon, Thomas F
lng	en

POST Data empty

Files empty

Key	Value
VUFIND_SESSION	adlfadaocf1ko15k3lkr6dbaje
language	nl

Session

Key	Value
__ZF	Array ( [_REQUEST_ACCESS_TIME] => 1747660912.3933 [_VALID] => Array ( [Zend\Session\Validator\Id] => adlfadaocf1ko15k3lkr6dbaje ) )
SessionState	Zend\Stdlib\ArrayObject Object ( [storage:protected] => Array ( [cookiePath] => / ) [flag:protected] => 2 [iteratorClass:protected] => ArrayIterator [protectedProperties:protected] => Array ( [0] => storage [1] => flag [2] => iteratorClass [3] => protectedProperties ) )
Search	Zend\Stdlib\ArrayObject Object ( [storage:protected] => Array ( [last] => /eind/Author/Home?author=%22Homer-Dixon%2C+Thomas+F%22&type=Author [params\|SolrAuthor\|hiddenFilters] => Array ( ) [params\|SolrAuthor\|limit] => 20 [params\|SolrAuthor\|sort] => [params\|SolrAuthor\|view] => list ) [flag:protected] => 2 [iteratorClass:protected] => ArrayIterator [protectedProperties:protected] => Array ( [0] => storage [1] => flag [2] => iteratorClass [3] => protectedProperties ) )
FlashMessenger	Zend\Stdlib\ArrayObject Object ( [storage:protected] => Array ( ) [flag:protected] => 2 [iteratorClass:protected] => ArrayIterator [protectedProperties:protected] => Array ( [0] => storage [1] => flag [2] => iteratorClass [3] => protectedProperties ) )

Server/Request Data

Key	Value
REDIRECT_VUFIND_ENV	development
REDIRECT_VUFIND_LOCAL_DIR	/usr/local/vufind/sites/eind
REDIRECT_VUFIND_LOCAL_MODULES	Brocade
REDIRECT_STATUS	200
VUFIND_ENV	development
VUFIND_LOCAL_DIR	/usr/local/vufind/sites/eind
VUFIND_LOCAL_MODULES	Brocade
HTTP_ACCEPT	/
HTTP_USER_AGENT	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
HTTP_COOKIE	VUFIND_SESSION=adlfadaocf1ko15k3lkr6dbaje; language=nl
HTTP_ACCEPT_ENCODING	gzip, br, zstd, deflate
HTTP_HOST	vufind2.brocade.uninova.nl
PATH	/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin
SERVER_SIGNATURE	<address>Apache/2.4.29 (Ubuntu) Server at vufind2.brocade.uninova.nl Port 80</address>
SERVER_SOFTWARE	Apache/2.4.29 (Ubuntu)
SERVER_NAME	vufind2.brocade.uninova.nl
SERVER_ADDR	10.251.0.151
SERVER_PORT	80
REMOTE_ADDR	3.145.82.96
DOCUMENT_ROOT	/var/www/html
REQUEST_SCHEME	http
CONTEXT_PREFIX	/eind
CONTEXT_DOCUMENT_ROOT	/usr/local/vufind/public
SERVER_ADMIN	webmaster@localhost
SCRIPT_FILENAME	/usr/local/vufind/public/index.php
REMOTE_PORT	64457
REDIRECT_URL	/eind/Author/Home
REDIRECT_QUERY_STRING	author=Homer-Dixon%2C+Thomas+F&lng=en
GATEWAY_INTERFACE	CGI/1.1
SERVER_PROTOCOL	HTTP/1.1
REQUEST_METHOD	GET
QUERY_STRING	author=Homer-Dixon%2C+Thomas+F&lng=en
REQUEST_URI	/eind/Author/Home?author=Homer-Dixon%2C+Thomas+F&lng=en
SCRIPT_NAME	/eind/index.php
PHP_SELF	/eind/index.php
REQUEST_TIME_FLOAT	1747660912.379
REQUEST_TIME	1747660912

Environment Variables empty

Registered Handlers

0. Whoops\Handler\PrettyPageHandler