Go build & exec: fork/exec: permission denied - macos

Question

I need to build a program using the Go toolchain and then execute it. For some reasons I get a permission error due the forking. Is there a way to circumvent this error or any best practice? I think my program does something similar with Go test tool, though go test doesn't get this kind of error.
package main
import(
"os"
"os/exec"
"flag"
log "github.com/golang/glog"
)
func main(){
flag.Parse()
tdir := "abc"
if err := os.MkdirAll(tdir, 0777); err !=nil{
log.Error(err)
return
}
f, err := os.Create(tdir + "/main.go")
if err !=nil{
log.Error(err)
return
}
if err = f.Chmod(0777); err !=nil{
log.Error(err)
return
}
defer f.Close()
defer os.Remove(f.Name())
if _, err = f.Write([]byte(tpl)); err !=nil{
log.Error(err)
return
}
cmd := exec.Command("go", "build", "-o", "edoc")
cmd.Path = tdir
b, err := cmd.CombinedOutput()
if err !=nil{
log.Errorf("%s, err %v", b, err)
return
}
}
var tpl = `package main
import(
"fmt"
"flag"
)
func main(){
flag.Parse()
fmt.Printf("Hello World")
}`
Error:
E0202 18:24:42.359008 13600 main.go:36] , err fork/exec abc: permission denied
OS: OSX 10.11

Answer 1

You're changing the command path from the location of your go binary, to abc.
type Cmd struct {
// Path is the path of the command to run.
//
// This is the only field that must be set to a non-zero
// value. If Path is relative, it is evaluated relative
// to Dir.
Path string
If you want to change the working directory, use Cmd.Dir