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Bzr revision metadata that doesn't exist in git:
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* one-on-one mapping to git-sha's and revision properties
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* git-sha+path -> fileid mapping
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"bzr" git branch with bzr-specific metadata:
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* under refs/remotes/ to hide it from the user
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* Tree object with several children:
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* ":revisions": single object with mappings from git sha to (bzr revid, revprops, file id mapping object)
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* "bzr revision id": single object with mappings from git sha to bzr file id, revision id
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.bzr needs extra git metadata:
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(for round-tripped revisions only)
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* global map from git sha's to bzr revision ids
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+ generated by bzr-git (slow) when not present
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* per bzr-revision map from git sha to bzr file id, revision id