Feature: Add goctl env (#1557)

tools/goctl/pkg/golang/bin.go

@@ -0,0 +1,27 @@
+package golang
+
+import (
+	"go/build"
+	"os"
+	"path/filepath"
+
+	"github.com/zeromicro/go-zero/tools/goctl/util/pathx"
+)
+
+// GoBin returns a path of GOBIN.
+func GoBin() string {
+	def := build.Default
+	goroot := os.Getenv("GOROOT")
+	bin := filepath.Join(goroot, "bin")
+	if !pathx.FileExists(bin) {
+		gopath := os.Getenv("GOPATH")
+		bin = filepath.Join(gopath, "bin")
+	}
+	if !pathx.FileExists(bin) {
+		bin = os.Getenv("GOBIN")
+	}
+	if !pathx.FileExists(bin) {
+		bin = filepath.Join(def.GOPATH, "bin")
+	}
+	return bin
+}

tools/goctl/pkg/golang/install.go

@@ -0,0 +1,17 @@
+package golang
+
+import (
+	"os"
+	"os/exec"
+)
+
+func Install(git string) error {
+	cmd := exec.Command("go", "install", git)
+	env := os.Environ()
+	env = append(env, "GO111MODULE=on", "GOPROXY=https://goproxy.cn,direct")
+	cmd.Env = env
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	err := cmd.Run()
+	return err
+}