https://bugzilla.wikimedia.org/show_bug.cgi?id=29590

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             Bug #: 29590
           Summary: Installer should sanity check pre-existing tables
           Product: MediaWiki
           Version: 1.17.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Installation
        AssignedTo: [email protected]
        ReportedBy: [email protected]
                CC: [email protected]
    Classification: Unclassified


Consider the following database, which we would like to install MediaWiki onto:

mysql> show tables;
+----------------------------------------------+
| Tables_in_wizard_test_mediawiki_install_head |
+----------------------------------------------+
| user                                         |
+----------------------------------------------+
1 row in set (0.00 sec)

There's a single user table here, ostensibly left over from a failed install.
OK, that's fine. How does the installer cope? It claims
"config-install-tables-exist", and then cheerfully attempts to access
'interwiki' table, which doesn't exist.

Ironically, the user table is unconditionally created.

Ideally, DatabaseInstaller->createTables should sanity check the existing
tables and error out with something more reasonable if they don't match up with
the schema, or complain that you should rather be using the ugprader.

You can treat this as a feature request. Probably.

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