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cache: move package to plumbing
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Because cache package is only intended to be used at internal level, we move it to the plumbing package.
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Last PR to fix #82:
This PR modifies the difftree package itself. The old version extracted the files in both trees and compare them by hand. The new version turn the trees into merkletrie.Noders and call the merkletrie.Difftree function on them.
How to review this PR:
treenoder.go: defines the treeNoder type that wraps a git.Tree and implements merkletrie.Noder.
change.go: defines the type of the output of a difftree operation. The type is the same as before, but I have moved it into its own file to keep the package organized. The old package defines the Action type too (insert, delete, modify), now, we reuse merkletrie.Action and it is no longer a field, but a method.
change_adaptor.go: defines functions to turn merkletrie.Changes into difftree.Changes.
difftree.go: before this patch this file holds all the logic to do a difftree, now it just turns the git.Trees into treeNoders, call merkletrie.difftree on them, and turns the resulting merkletrie.Changes into difftree.Changes.
The only interesting piece of code here is that noders don't have the concept of mode (file permissions). The treenoder type codifies git.Tree modes into the merkletrie.Noder hash, so changes in the mode of a file are detected as modifications, just as the original git diff-tree command does.
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Sometimes, the `TestClone` and `TestPush` tests of `transport/file` fail
in travis.
This is due to a race condition caused by an incorrect usage of
`Cmd.Wait()` while reading from the output and error pipes of the
command.
This patch fixes the problem by using `Cmd.CombinedOutput()` instead of
calling `Cmd.Start()` and `Cmd.Wait()` while reading from the output and
error pipes.
Details:
From the `exec` package documentation:
```
Wait will close the pipe after seeing the command exit, so most callers
need not close the pipe themselves; however, an implication is that it
is incorrect to call Wait before all reads from the pipe have completed.
For the same reason, it is incorrect to call Run when using StdoutPipe.
```
In our tests, the old `execAndGetOutput` function was creating two
gorutines to read from the stderr and stdout pipes of the command and
then call `Wait` on the command.
This caused a race condition: when the `Wait` call finished before the
gorutines have read from the pipes, they returned caused an error on
`outErr`.
The problem only happens sometimes on travis.
To reproduce the problem locally, just add a call to
time.Sleep(time.Second) to the gorutine before its `ioutil.ReadAll` call
to delay them, then `Wait` will always finish before them, closing the
pipes, and the gorutines will fail. The returned error detected by the
test will be:
```
FAIL: server_test.go:55: ServerSuite.TestClone
server_test.go:65:
c.Assert(err, IsNil, Commentf("STDOUT:\n%s\nSTDERR:\n%s\n", stdout, stderr))
... value *os.PathError = &os.PathError{Op:"read", Path:"|0", Err:0x9} ("read |0: bad file descriptor")
... STDOUT:
STDERR:
```
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The transport/file common suite test generates a temporal directory; It is used to store the go-git client command and some links to it: git-upload-pack and git-receive-pack.
This directory is not deleted at the test teardown, so every time we run a test, we pollute "/tmp".
This patch adds a teardown function for the suite that deletes the temporal directory.
It also calls the teardown of the embedded fixtures.Suite, which is probably what we want also.
I have also simplify the call to ioutil.TempDir as it already uses the default tmp dir if no dir is provided.
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Fix missing objects if they where deltified using ref-delta
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- Deleted invalid logic that returned nil if an ref-delta was not found into the decoder index. This logic was missing objects if it was deltified using ref-deltas.
- Now, to avoid that problem, index is mandatory to decode correctly a packfile of a specific type. Decoder.SetOffsets method now is called into the EncodedObjectIterator to avoid this problem.
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Improve documentation
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* add package description.
* add godoc to DecodeBlob.
* clarify godoc for Object and Blob.
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This patch adds a new method to the Tree object that allows you to get a child tree from a parent tree by its relative name.
Before this patch, this was only possible with files, using the File method.
The new Tree method has a similar signature to the old File method for consistency.
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* Simple object cache that keeps in memory the last undeltified objects.
When no more objects can be kept into memory, the oldest one is deleted (FIFO).
This speeds up packfile operations preventing redundant seeks and decodes.
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* remove SetAuth functions, implement at NewUploadPackSession/NewReceivePackSession level.
* propagate transport.Auth from Fetch/Pull/Clone options to the transport API.
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* server: add generic server implementation (transport-independent),
both for git-upload-pack and git-receive-pack.
* server: move internal functions to internal/common.
* cli: add git-receive-pack and git-upload-pack implementations.
* format/packfile: add UpdateObjectStorage function, extracted from
Remote.
* transport: implement tranport RPC-like, only with git-upload-pack and
git-receive-pack methods. Client renamed to Transport.
* storer: add storer.Storer interface.
* protocol/packp: add UploadPackResponse constructor with packfile.
* protocol/packp: fix UploadPackResponse encoding, add tests.
* protocol/packp/capability: implement All.
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* remote: add Push.
* add Push method to Remote.
* add method Push to Repository.
* examples: add push example.
* requested changes
* add tests, fixes
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* Extract billy
Billy is a new library directly extracted from go-git. It abstract
several storages systems in a filesystem interface.
More in github.com/src-d/billy
* Fix grouping in imports block
* Update billy to v1
* Re-remove fs_implementation example
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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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* storage: shallow storage
* changes
* changes
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