Build failure with "CGO_ENABLED=0" in the Makefile

[wanghong230]

Is this a BUG REPORT or FEATURE REQUEST?:
BUG
What happened:
Build is failing with CGO_ENABLE=0
What you expected to happen:
You will see the following error message during the build:

CGO_ENABLED=0 go run vendor/github.com/gobuffalo/packr/packr/main.go build -v -i -ldflags '-X github.com/argoproj/argo.version=2.1.0 -X github.com/argoproj/argo.buildDate=2018-04-02T20:15:32Z -X github.com/argoproj/argo.gitCommit=fe23c2f651a61a2d7aa877a86edff9802d7b5b47 -X github.com/argoproj/argo.gitTreeState=dirty -X github.com/argoproj/argo/cmd/argo/commands.imageTag=latest' -o /Users/hwang8/dev/src/github.com/argoproj/argo/dist/argo ./cmd/argo
net
os/user
go install os/user: open /usr/local/go/pkg/darwin_amd64/os/user.a: permission denied
go install net: open /usr/local/go/pkg/darwin_amd64/net.a: permission denied
Error: exit status 1
Usage:
  packr build [flags]

Flags:
  -h, --help   help for build

exit status 255
make: *** [cli] Error 1
**How to reproduce it (as minimally and precisely as possible)**:
I just installed the golang 1.9.5 and ran the build, not sure if this only applies to the new dev environment.
**Anything else we need to know?**:

**Environment**:
- Argo version:
``` N/A
$ argo version
``` N/A
- Kubernetes version :
``` N/A
$ kubectl version -o yaml
``` N/A

**Other debugging information (if applicable)**:
- workflow result:
``` N/A
$ argo get <workflowname>
```N/A
- executor logs:
```N/A
$ kubectl logs <failedpodname> -c init
$ kubectl logs <failedpodname> -c wait

• workflow-controller logs:

$ kubectl logs -n kube-system $(kubectl get pods -l app=workflow-controller -n kube-system -o name)

The workaround is to delete the CGO_ENABLED=0 in the make file.

There is a golang issue that is discussing the similar issue: golang/go#18981

[wanghong230]

The root cause is still from golang/go#18981, the following works for me:

Install go via brew:
brew install go
export PATH=$PATH:/usr/local/opt/go/libexec/bin

Instead of installing golang via downloading the package from golang official website, brew is installing the go at the /usr/local/opt/go/ with permission set differently.

[wanghong230]

Official GO:

MTVL1679decd5:argo hwang8$ ls -l /usr/local/go/pkg/darwin_amd64/os/user.a
-rw-r--r--  1 root  wheel  100768 Mar 28 21:37 /usr/local/go/pkg/darwin_amd64/os/user.a

Brew GO:

MTVL1679decd5:argo hwang8$ ls -l /usr/local/Cellar/go/1.10.1/libexec/pkg/darwin_amd64/os/user.a
-rw-r--r--  1 hwang8  admin  101548 Mar 28 21:28 /usr/local/Cellar/go/1.10.1/libexec/pkg/darwin_amd64/os/user.a

It is usr and group permission issue.