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One use of go-git is to transfer git data from a non-standard git repo
(not stored in a file system, for example) to a "remote" backed by a
standard, local .git repo.
In this scenario, delta compression is not needed to reduce transfer
time over the "network", because there is no network. The underlying
storage layer has already taken care of the data tranfer, and sending
the objects to local .git storage doesn't require compression. So this
PR gives the user the option to turn off compression when it isn't
needed.
Of course, this results in a larger, uncompressed local .git repo, but
the user can then run git gc or git repack on that repo if they care
about the storage costs.
Turning the pack window to 0 on reduces total push time of a 36K repo
by 50 seconds (out of a pre-PR total of 3m26s).
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* plumbing: add DeltaObject interface for EncodedObjects that
are deltas and hold additional information about them, such
as the hash of the base object.
* plumbing/storer: add DeltaObjectStorer interface for object
storers that can return DeltaObject. Note that calls to
EncodedObject will never return instances of DeltaObject.
That requires explicit calls to DeltaObject.
* storage/filesystem: implement DeltaObjectStorer interface.
* plumbing/packfile: packfile encoder now supports reusing
deltas that are already computed (e.g. from an existing
packfile) if the storage implements DeltaObjectStorer.
Reusing deltas boosts performance of packfile generation
(e.g. on push).
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To be able to fix #261 we will move again to gopkg.in before v4 stable release.
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* packfile: delta selection logic
- Implemented logic to assign deltas to objects
* Requested changes
* Improved tests and fix errors
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* plumbing: rename Object -> EncodedObject.
* plumbing/storer: rename ObjectStorer -> EncodedObjectStorer.
* move difftree to plumbing/difftree.
* move diff -> utils/diff
* make Object/Tag/Blob/Tree/Commit/File depend on storer.
* Object and its implementations now depend only on
storer.EncodedObjectStorer, not git.Repository.
* Tests are decoupled accordingly.
* move Object/Commit/File/Tag/Tree to plumbing/object.
* move Object/Commit/File/Tag/Tree to plumbing/object.
* move checkClose to utils/ioutil.
* move RevListObjects to plumbing/revlist.Objects.
* move DiffTree to plumbing/difftree package.
* rename files with plural nouns to singular
* plumbing/object: add GetBlob/GetCommit/GetTag/GetTree.
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* format/packfile: implement delta encoding
- Added all the logic to the encoder to be able to encode ref-delta and offset-delta objects
- Created plumbing.ObjectToPack to handle deltas and standard objects when we are writting them into a packfile
- Added specific encoder delta tests, one standard object and one delta, and one standard object and two deltas
* Requested changes.
* Requested changes
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* plumbing/packfile: PACK encoder
- Added simple PACK encoder, deltas not supported by now
* Requested changes
* Requested changes
* Requested changes
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