https://bugzilla.wikimedia.org/show_bug.cgi?id=72070

            Bug ID: 72070
           Summary: Duplicate-archive files not detected (previously
                    deleted files when uploading identical [SHA1] files)
                    when file extension is upper case
           Product: Wikimedia
           Version: wmf-deployment
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: General/Unknown
          Assignee: [email protected]
          Reporter: [email protected]
       Web browser: ---
   Mobile Platform: ---

I do not get any warning when I upload a file with an upper case file extension
whose content consists of entirely the same data and therefore calculates to
the same SHA1 hash at test.wikipedia.org and it is reported to be the same at
commons.wikipedia.org.

This is because MediaWiki looks up the files by
{hash}.{file-extension}==fa_storage_key. Since fa_storage_key contains only
lower-case file extensions and upper case extension are not normalized, nothing
is found upon uploading files with upper case file extensions. This should be
trivial to fix: Look up the SHA1 and not the storage key.

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