code: func cleanRootPath(pattern string) string {
  	winBashMu.Lock()
  	defer winBashMu.Unlock()
  
  	// check if path starts with windows drive letter
  	if !winPathHasDrive(pattern) {
  		return pattern
  	}
  
  	if len(winBashPrefix) < 1 {
  		// cmd.Path is something like C:\Program Files\Git\usr\bin\pwd.exe
  		cmd := subprocess.ExecCommand("pwd")
  		winBashPrefix = strings.Replace(filepath.Dir(filepath.Dir(filepath.Dir(cmd.Path))), `\`, "/", -1) + "/"
  	}
  
  	return strings.Replace(pattern, winBashPrefix, "/", 1)
  }
docs: // cleanRootPath replaces the windows root path prefix with a unix path prefix:
  // "/". Git Bash (provided with Git For Windows) expands a path like "/foo" to
  // the actual Windows directory, but with forward slashes. You can see this
  // for yourself:
  //
  //   $ git /foo
  //   git: 'C:/Program Files/Git/foo' is not a git command. See 'git --help'.
  //
  // You can check the path with `pwd -W`:
  //
  //   $ cd /
  //   $ pwd
  //   /
  //   $ pwd -W
  //   c:/Program Files/Git