SID-01952: Admin login fails with uninitialized at PreferencePlugin.pm

Status:	Unanswered	TWiki version:	6.0.0	Perl version:	perl 5, version 18, subversion 2 (v5.18.2) built for x86_64
Category:	PreferencesPlugin	Server OS:	Ubuntu 14.04	Last update:	11 years ago

When I click on a user from the TwikiUsers section on /do/view/Main/WebHome "Use of uninitialized value in lc at /var/www/twiki/lib/TWiki/Plugins/PreferencesPlugin.pm line 120."

I just did the installation using Twiki 6.0 on Ubuntu 14.04.

After some investigation, I noticed that the $query->param is equal to 0.

The $query is set by TWiki::Func::getCgiQuery() so I believe that this is not being set properly.

There are no errors in the apache error log, access log or the twiki log.

There are no config errors or warnings on the do/configure page. I can login from the configure page.

-- Chris Radyk - 2014-07-26

Discussion and Answer

Additionally, the dump of the query returned from

my $query = TWiki::Func::getCgiQuery();

is

query = $VAR1 = bless( {
                 'uploads' => {},
                 'remote_address' => '192.168.1.131',
                 'remote_user' => undef,
                 'cookies' => {
                                'TWIKISID' => bless( {
                                                       'name' => 'TWIKISID',
                                                       'value' => [
                                                                    '3836f16990625d3e6d1efce7ad13b979'
                                                                  ],
                                                       'path' => '/'
                                                     }, 'CGI::Cookie' )
                              },
                 'headers' => {
                                'user-agent' => [
                                                  'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:31.0) Gecko/20100101 Firefox/31.0'
                                                ],
                                'connection' => [
                                                  'keep-alive'
                                                ],
                                'accept' => [
                                              'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'
                                            ],
                                'host' => [
                                            '192.168.1.77'
                                          ],
                                'accept-language' => [
                                                       'en-US,en;q=0.5'
                                                     ],
                                'accept-encoding' => [
                                                       'gzip, deflate'
                                                     ],
                                'cookie' => [
                                              'TWIKISID=3836f16990625d3e6d1efce7ad13b979'
                                            ],
                                'referer' => [
                                               'http://192.168.1.77/do/save/Main/ChrisRadyk'
                                             ]
                              },
                 'uri' => '/do/view/Main/ChrisRadyk',
                 'request_method' => 'GET',
                 'secure' => 0,
                 'param_list' => [],
                 'path_info' => '/Main/ChrisRadyk',
                 'param' => {},
                 'action' => 'view',
                 'server_port' => undef
               }, 'TWiki::Request' );

Any ideas on the correct way to resolve this? Why would I be seeing this when no one else is?

Thanks

-- Chris Radyk - 2014-07-27

Your diagnosis is correct, and it has been fixed after TWiki 6.0.0 came out: http://develop.twiki.org/~twiki4/cgi-bin/view/Bugs/Item7504.

Unfortunately I can not reproduce the behaviour you are seeing, not even after setting the configuration variable WarningsAreErrors. The "uninitialized value" is only a warning, so it should not prevent TWiki from processing the page. Strange.

You could either install the current PreferencesPlugin, or apply the one-line-fix manually, or we'd need to figure out why your installation gives this error message, but apparently without actually dying (if a request dies, it leaves a trace in the error log). The current line 120 reads:

my $action = lc( $query->param( 'prefsaction' ) || '' );

-- Harald Jörg - 2014-07-27

So, I figured out why it was an issue. I had forgot that I enabled the flags

$ENV{TWIKI_ASSERTS} = 1; $ENV{TWIKI_MONITOR} = 1;

in LocalLib.cfg. That explains why I was seeing the warning.

Thanks for you reply.

-- Chris Radyk - 2014-07-28

-- Chris Radyk - 2014-07-28

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