Q:

GOPATH value setting

I'm install the go with the go1.3.1.windows-amd64.msi, after installation  GOROOT is default setting, I found the 
D:\Programs\Go\bin in the PATH,then I create a GOPATH environment variant,
when using the 'go get' command, error occurs:
package github.com/coreos/etcd: cannot download, $GOPATH must not be set to $GOROOT. For more details see: go help gopath
OS: windows 7 
GOPATH will conflict with GOROOT?
How can I set these two PATH values?

A:

GOROOT must reference the folder where you installed GO
GOPATH must reference an empty folder which will be your workspace (src/pkg/bin for your projects)

Add those two variables in your user environment variables.
A go get github.com/coreos/etcd should:

download the sources in %GOPATH%/src/github.com/coreos/etcd (src is created for you)
compile it in %GOPATH%/pkg/windows_amd64 (pkg/ is created for you, windows_amd64 reflects your windows architecture)
with go install, install it in %GOPATH%/bin (bin/ is also created for you)

Note: with Go 1.8+ (Q2 2017), GOPATH might be set for you by default to (on Windows) %USERPROFILE%/go.
On Linux, it would be $HOME/go: see issue 17262.

Update 2018, three years later: GOPATH is becoming obsolete with Go 1.11 modules:
mkdir newProject
cd newProject
set GO111MODULE=on
go mod init myproject

A:

I faced with the same problem. However i set everything as it was said in the tutorial  but forgot to restart cmd. So the steps were:

Download and install Go distribution(the GOROOT variable was set automatically)
Create new folder wherever you like for your workspace, create there 3 directories: bin, src and pkg
Then go to Control Panel -> All Control Panel Items -> System -> Advansed System Settings -> tab Advanced -> Environment Variables -> add new system variable by clicking New on System varaibles -> Variable name = GOPATH, Variable value = Your:\directory\that\you\created
When you're done, RESTART your cmd or Bash(that's important) and you have your GOPATH set. To be sure run go env and you will see your value.

