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This slightly extends the roothash loading logic to first check for a user.verity.roothash extended attribute on the image file. If it exists, it is used as Verity root hash and the ".roothash" file is not used. This should improve the chance that the roothash is retained when the file is moved around, as the data snippet is attached directly to the image file. The field is still detached from the file payload however, in order to make sure it may be trusted independently. This does not replace the ".roothash" file loading, it simply adds a second way to retrieve the data. Extended attributes are often a poor choice for storing metadata like this as it is usually difficult to discover for admins and users, and hard to fix if it ever gets out of sync. However, in this case I think it's safe as verity implies read-only access, and thus there's little chance of it to get out of sync.
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