add PCF auth method, agent, and cli handler

vendor/code.cloudfoundry.org/gofileutils/fileutils/file_utils.go

@@ -0,0 +1,74 @@
+package fileutils
+
+import (
+	"io"
+	"io/ioutil"
+	"os"
+	"path"
+	"path/filepath"
+)
+
+func Open(path string) (file *os.File, err error) {
+	err = os.MkdirAll(filepath.Dir(path), os.ModeDir|os.ModePerm)
+	if err != nil {
+		return
+	}
+
+	return os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+}
+
+func Create(path string) (file *os.File, err error) {
+	err = os.MkdirAll(filepath.Dir(path), os.ModeDir|os.ModePerm)
+	if err != nil {
+		return
+	}
+
+	return os.Create(path)
+}
+
+func CopyPathToPath(fromPath, toPath string) (err error) {
+	srcFileInfo, err := os.Stat(fromPath)
+	if err != nil {
+		return err
+	}
+
+	if srcFileInfo.IsDir() {
+		err = os.MkdirAll(toPath, srcFileInfo.Mode())
+		if err != nil {
+			return err
+		}
+
+		files, err := ioutil.ReadDir(fromPath)
+		if err != nil {
+			return err
+		}
+
+		for _, file := range files {
+			err = CopyPathToPath(path.Join(fromPath, file.Name()), path.Join(toPath, file.Name()))
+			if err != nil {
+				return err
+			}
+		}
+	} else {
+		var dst *os.File
+		dst, err = Create(toPath)
+		if err != nil {
+			return err
+		}
+		defer dst.Close()
+
+		dst.Chmod(srcFileInfo.Mode())
+
+		src, err := os.Open(fromPath)
+		if err != nil {
+			return err
+		}
+		defer src.Close()
+
+		_, err = io.Copy(dst, src)
+		if err != nil {
+			return err
+		}
+	}
+	return err
+}