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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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* 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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* protocol/packp: add Packfile field to ReferenceUpdateRequest.
* protocol/packp: add NewReferenceUpdateRequestFromCapabilities.
* NewReferenceUpdateRequestFromCapabilities can be used to create
a ReferenceUpdateRequest with initial capabilities compatible with
the server.
* protocol/packp: fix new line handling on report status.
* transport/file: test error on unexisting command.
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* protocol/packp: remove redundant isFlush check on AdvRefs.
* protocol/packp: improve AdvRefs documentation.
* transport: improve error handling for non-existing repos.
* protocol/packp: AdvRefs Decode now returns different errors for
empty, but syntactically correct, AdvRefs message (ErrEmptyAdvRefs)
and empty input (ErrEmptyInput).
* transport/internal/common: read stderr only when needed (ErrEmptyInput).
Close the client gracefully.
* transport/internal/common: missing stderr on non existing repository
does not block.
* transport/internal/common: buffer error messages.
* transport/file: fix changing binary name, add tests.
* transport/file: support changing git-upload-pack and git-receive-pack
binary names.
* transport/file: add tests for misbehaving servers.
* transport/internal/common: remove Stderr field.
* transport/internal/common: do not close twice.
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* transport: move common packp protocol out of ssh transport.
* fixtures: add fixture for empty repository.
* transport: add file:// transport
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