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+= Git bundle v2 format
+The Git bundle format is a format that represents both refs and Git objects.
+== Format
+We will use ABNF notation to define the Git bundle format. See
+protocol-common.txt for the details.
+bundle = signature *prerequisite *reference LF pack
+signature = "# v2 git bundle" LF
+prerequisite = "-" obj-id SP comment LF
+comment = *CHAR
+reference = obj-id SP refname LF
+pack = ... ; packfile
+== Semantics
+A Git bundle consists of three parts.
+* "Prerequisites" lists the objects that are NOT included in the bundle and the
+ reader of the bundle MUST already have, in order to use the data in the
+ bundle. The objects stored in the bundle may refer to prerequisite objects and
+ anything reachable from them (e.g. a tree object in the bundle can reference
+ a blob that is reachable from a prerequisite) and/or expressed as a delta
+ against prerequisite objects.
+* "References" record the tips of the history graph, iow, what the reader of the
+ bundle CAN "git fetch" from it.
+* "Pack" is the pack data stream "git fetch" would send, if you fetch from a
+ repository that has the references recorded in the "References" above into a
+ repository that has references pointing at the objects listed in
+ "Prerequisites" above.
+In the bundle format, there can be a comment following a prerequisite obj-id.
+This is a comment and it has no specific meaning. The writer of the bundle MAY
+put any string here. The reader of the bundle MUST ignore the comment.
+=== Note on the shallow clone and a Git bundle
+Note that the prerequisites does not represent a shallow-clone boundary. The
+semantics of the prerequisites and the shallow-clone boundaries are different,
+and the Git bundle v2 format cannot represent a shallow clone repository.