Fix filepath (#990)

tools/goctl/util/path.go

@@ -2,6 +2,7 @@ package util
 
 import (
 	"fmt"
+	"io/fs"
 	"os"
 	"path"
 	"path/filepath"
@@ -112,3 +113,54 @@ func FindProjectPath(loc string) (string, bool) {
 
 	return "", false
 }
+
+// ReadLink returns the destination of the named symbolic link recursively.
+func ReadLink(name string) (string, error) {
+	name, err := filepath.Abs(name)
+	if err != nil {
+		return "", err
+	}
+
+	if name == "/" {
+		return "/", nil
+	}
+
+	isLink, err := isLink(name)
+	if err != nil {
+		return "", err
+	}
+
+	if !isLink {
+		dir, base := filepath.Split(name)
+		dir = filepath.Clean(dir)
+		dir, err := ReadLink(dir)
+		if err != nil {
+			return "", err
+		}
+
+		return filepath.Join(dir, base), nil
+	}
+
+	link, err := os.Readlink(name)
+	if err != nil {
+		return "", err
+	}
+
+	dir, base := filepath.Split(link)
+	dir = filepath.Dir(dir)
+	dir, err = ReadLink(dir)
+	if err != nil {
+		return "", err
+	}
+
+	return filepath.Join(dir, base), nil
+}
+
+func isLink(name string) (bool, error) {
+	fi, err := os.Lstat(name)
+	if err != nil {
+		return false, err
+	}
+
+	return fi.Mode()&fs.ModeSymlink != 0, nil
+}