cannot go get the source code

Could you please clarify what you are doing, steps to reproduce?
What version of Juju are you running?

I follow the github tutorial to get the source code for compiling as the follow command:
go get -d -v github.com/juju/juju/...

After a long term downloading and then got the error as below:

get "gopkg.in/goose.v1/swift": verifying non-authoritative meta tag
github.com/vmware/govmomi (download)
package github.com/juju/juju/cmd/juju
 imports context: unrecognized import path "context" (import path does not begin with hostname)

I am not clear whether you were following instructions from CONTRIBUTING (for example, https://github.com/juju/juju/blob/staging/CONTRIBUTING.md) or from README (for example, https://github.com/juju/juju/blob/staging/README.md).

A URL you are using would be helpful :)

Do you have GOPATH setup?

This happens if you follow the instructions in the juju README.md file (under the "Getting Juju" heading):

$ go version
go version go1.6.2 linux/amd64
$ GOPATH=~/go go get -d -v github.com/juju/juju/...
...
github.com/vmware/govmomi (download)
package github.com/juju/juju/cmd/juju
        imports context: unrecognized import path "context" (import path does not begin with hostname)

I believe this is due to the Juju code importing github.com/vmware/govmomi, which appears to depend on the context packaging being in the standard library, which is a Go 1.7 feature - using an older version of Go to get the Juju sources will now fail.

The options are likely to be:

- Require Go 1.7 to fetch/build Juju.

- Change the instructions to git clone juju, then use godeps to fetch the dependencies (instead of relying on `go get`).

- Import a version of govmomi that is version pinned to code prior to the switch to "context" imports.

Please follow instructions from https://github.com/juju/juju/blob/develop/CONTRIBUTING.md#dependency-management

You are missing build dependencies and need to run godeps tool before building juju.

While I understand the need for godeps before building, the instructions in the README.md tell you that you should fetch the code with:

  go get -d -v github.com/juju/juju/...

If you do this with Go 1.6 this fails, hence the bug reports.

I believe one of the following needs to be done:

- Document a minimum version of Go 1.7 (in which case the above go get command works)

- Replace the above go get command with a git clone, followed by godeps.

It seems like this is about Juju 2.x so moving to the "juju" project. "juju-core" is for Juju 1.25.

Juju 2.x now requires Go 1.8. I'm going to reword the documentation and reorganise some of the setup related Make targets.

https://github.com/juju/juju/pull/7427/