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special characters in wgDBname lead to "could not create directory" error during file uploads
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to reproduce: get a fresh installation of mw, name the database with a dot in the name eg. "" (I've tried sqlite only but shouldn't matter), uploading a file will yield Could not create directory "mwstore://local-backend/local-public/<path>".

I think this misleading error is due to the fact that inside resolveStoragePath by default the container name gets expanded (var fullContainerName) via wfWikiID (i.e. dbname + dbprefix) and that in turn fails to get validated by isValidContainerName.

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