获取源文件路径，可以用 runtime.Caller
func Caller(skip int) (pc uintptr, file string, line int, ok bool)Caller reports file and line number information about function invocations on the calling goroutine's stack. The argument skip is the number of stack frames to ascend, with 0 identifying the caller of Caller. (For historical reasons the meaning of skip differs between Caller and Callers.) The return values report the program counter, file name, and line number within the file of the corresponding call. The boolean ok is false if it was not possible to recover the information.
=========================================
Executable returns the path name for the executable that started the current process. There is no guarantee that the path is still pointing to the correct executable. If a symlink was used to start the process, depending on the operating system, the result might be the symlink or the path it pointed to. If a stable result is needed, path/filepath.EvalSymlinks might help.Executable returns an absolute path unless an error occurred.
The main use case is finding resources located relative to an executable.
Executable is not supported on nacl.
得到启动当前进程的可执行文件的路径与文件名。