types.py 文件源码

def convert(self, value, param, ctx):
        rv = value

        is_dash = self.file_okay and self.allow_dash and rv in (b'-', '-')

        if not is_dash:
            if self.resolve_path:
                rv = os.path.realpath(rv)

            try:
                st = os.stat(rv)
            except OSError:
                if not self.exists:
                    return self.coerce_path_result(rv)
                self.fail('%s "%s" does not exist.' % (
                    self.path_type,
                    filename_to_ui(value)
                ), param, ctx)

            if not self.file_okay and stat.S_ISREG(st.st_mode):
                self.fail('%s "%s" is a file.' % (
                    self.path_type,
                    filename_to_ui(value)
                ), param, ctx)
            if not self.dir_okay and stat.S_ISDIR(st.st_mode):
                self.fail('%s "%s" is a directory.' % (
                    self.path_type,
                    filename_to_ui(value)
                ), param, ctx)
            if self.writable and not os.access(value, os.W_OK):
                self.fail('%s "%s" is not writable.' % (
                    self.path_type,
                    filename_to_ui(value)
                ), param, ctx)
            if self.readable and not os.access(value, os.R_OK):
                self.fail('%s "%s" is not readable.' % (
                    self.path_type,
                    filename_to_ui(value)
                ), param, ctx)

        return self.coerce_path_result(rv)