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WIP - Travis Integration Test Support #1

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Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Add travis support for running integration tests with the client package
and go test framework

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
@crosbymichael crosbymichael changed the title WIP- Travis Integration Test Support WIP - Travis Integration Test Support May 25, 2017
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I hate you all

seemethere pushed a commit to seemethere/containerd that referenced this pull request Feb 16, 2018
(below is a quote from my runc commit 6f82d4b)

TL;DR: check for IsExist(err) after a failed MkdirAll() is both
redundant and wrong -- so two reasons to remove it.

Quoting MkdirAll documentation:

> MkdirAll creates a directory named path, along with any necessary
> parents, and returns nil, or else returns an error. If path
> is already a directory, MkdirAll does nothing and returns nil.

This means two things:

1. If a directory to be created already exists, no error is
returned.

2. If the error returned is IsExist (EEXIST), it means there exists
a non-directory with the same name as MkdirAll need to use for
directory. Example: we want to MkdirAll("a/b"), but file "a"
(or "a/b") already exists, so MkdirAll fails.

The above is a theory, based on quoted documentation and my UNIX
knowledge.

3. In practice, though, current MkdirAll implementation [1] returns
ENOTDIR in most of cases described in docker-archive#2, with the exception when
there is a race between MkdirAll and someone else creating the
last component of MkdirAll argument as a file. In this very case
MkdirAll() will indeed return EEXIST.

Because of docker-archive#1, IsExist check after MkdirAll is not needed.

Because of docker-archive#2 and docker-archive#3, ignoring IsExist error is just plain wrong,
as directory we require is not created. It's cleaner to report
the error now.

Note this error is all over the tree, I guess due to copy-paste,
or trying to follow the same usage pattern as for Mkdir(),
or some not quite correct examples on the Internet.

[1] https://github.com/golang/go/blob/f9ed2f75/src/os/path.go

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
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