Extension:Cargo/Download and installation
|Cargo - navigation|
|Basics||Main page (talk) · Download and installation · Quick start guide · Other documentation · SMW migration guide|
|Using Cargo||Storing data · Querying data (Display formats) · Browsing data · Exporting data · Other features|
|Resources for help||Common problems · Known bugs and planned features · Getting support|
|About Cargo||Authors and credits · Version history · Sites that use Cargo · Cargo and Semantic MediaWiki · FAQ|
You can download the Cargo code, in .zip format, here.
You can also download the code directly via Git from the MediaWiki source code repository (see available tags). From a command line, you can call the following:
git clone https://gerrit.wikimedia.org/r/p/mediawiki/extensions/Cargo
To view the code online, including version history for each file, go here.
To install the extension, place the entire 'Cargo' directory within your MediaWiki 'extensions' directory, then add the following line to your 'LocalSettings.php' file:
require_once( "$IP/extensions/Cargo/Cargo.php" );
Once you have the code set up, Cargo has two database tables in the main database that it requires. You will need to set these up by going to MediaWiki's /maintenance directory and calling the following:
If your wiki also has Semantic MediaWiki installed on it, you will probably need to add the following line to LocalSettings.php to have Semantic MediaWiki work:
$smwgEnabledCompatibilityMode = true;
Finally, you need to make sure that the database account with which the code accesses the database has the ability to both create and drop tables. This may or may not be the standard MediaWiki database account; see below.
Setting the Cargo database
By default, Cargo uses the standard MediaWiki database to hold its data; it differentiates its DB tables from all the rest by starting all their names with "cargo__". You can change this to have Cargo use any other database. (Though Cargo's two "helper" tables, cargo_tables and cargo_pages, will remain in the main MW database.)
There are two main reasons why using a separate database may be a good idea:
- There is the possibility that Cargo has a security leak, i.e. that Cargo queries allow for the inclusion of malicious SQL that would let users access information that they're not supposed to, or even modify the database. There are no known security leaks - and Cargo uses a lot of safeguards to try to prevent any such leaks - but that does not mean that no leak exists. If there is any such vulnerability, having a separate database using a separate database user with restricted permissions is the safer option.
- If slow, intensive queries are run, either unknowingly or maliciously, having a separate database on a separate database server would prevent such queries from interfering with the regular operation of the wiki.
Cargo offers the following global settings to let you set a separate database:
These are set in the same way as their non-Cargo equivalents, which can be found in LocalSettings.php. To set this custom database, add lines for those five variables to LocalSettings.php, under the inclusion of Cargo.