Create a symbol link file named protoc-gen-goctl from goctl (#1076)

tools/goctl/rpc/generator/defaultgenerator.go

@@ -1,9 +1,11 @@
 package generator
 
 import (
-	"os/exec"
+	"fmt"
+	"runtime"
 
 	"github.com/tal-tech/go-zero/tools/goctl/util/console"
+	"github.com/tal-tech/go-zero/tools/goctl/util/env"
 )
 
 // DefaultGenerator defines the environment needs of rpc service generation
@@ -25,17 +27,24 @@ func NewDefaultGenerator() Generator {
 // Prepare provides environment detection generated by rpc service,
 // including go environment, protoc, whether protoc-gen-go is installed or not
 func (g *DefaultGenerator) Prepare() error {
-	_, err := exec.LookPath("go")
-	if err != nil {
+	if !env.CanExec() {
+		return fmt.Errorf("%s: can not start new processes using os.StartProcess or exec.Command", runtime.GOOS)
+	}
+
+	if _, err := env.LookUpGo(); err != nil {
 		return err
 	}
 
-	_, err = exec.LookPath("protoc")
-	if err != nil {
+	if _, err := env.LookUpProtoc(); err != nil {
 		return err
 	}
 
-	_, err = exec.LookPath("protoc-gen-go")
+	_, err := env.LookUpProtocGenGoctl()
+	if err == nil {
+		return nil
+	}
 
+	g.log.Warning("%+v", err)
+	_, err = env.LookUpProtocGenGo()
 	return err
 }