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streamclone: support for producing and consuming stream clone bundles...

streamclone: support for producing and consuming stream clone bundles Up to this point, stream clones only existed as a dynamically generated data format produced and consumed during streaming clones. In order to support this efficient cloning format with the clone bundles feature, we need a more formal, on disk representation of the streaming clone data. This patch introduces a new "bundle" type for streaming clones. Unlike existing bundles, it does not contain changegroup data. It does, however, share the same concepts like the 4 byte header which identifies the type of data that follows and the 2 byte abbreviation for compression types (of which only "UN" is currently supported). The new bundle format is essentially the existing stream clone version 1 data format with some headers at the beginning. Content negotiation at stream clone request time checked for repository format/requirements compatibility before initiating a stream clone. We can't do active content negotiation when using clone bundles. So, we put this set of requirements inside the payload so consumers have a built-in mechanism for checking compatibility before reading and applying lots of data. Of course, we will also advertise this requirements set in clone bundles. But that's for another patch. We currently don't have a mechanism to produce and consume this new bundle format. This will be implemented in upcoming patches. It's worth noting that if a legacy client attempts to `hg unbundle` a stream clone bundle (with the "HGS1" header), it will abort with: "unknown bundle version S1," which seems appropriate.

Patrick Mezard - - Load All Authors

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