par2backend.py 文件源码

def transfer(self, method, source_path, remote_filename):
        """create Par2 files and transfer the given file and the Par2 files
        with the wrapped backend.

        Par2 must run on the real filename or it would restore the
        temp-filename later on. So first of all create a tempdir and symlink
        the soure_path with remote_filename into this.
        """
        import pexpect

        par2temp = source_path.get_temp_in_same_dir()
        par2temp.mkdir()
        source_symlink = par2temp.append(remote_filename)
        source_target = source_path.get_canonical()
        if not os.path.isabs(source_target):
            source_target = os.path.join(os.getcwd(), source_target)
        os.symlink(source_target, source_symlink.get_canonical())
        source_symlink.setdata()

        log.Info("Create Par2 recovery files")
        par2create = 'par2 c -r%d -n1 %s %s' % (self.redundancy, self.common_options, source_symlink.get_canonical())
        out, returncode = pexpect.run(par2create, None, True)

        source_symlink.delete()
        files_to_transfer = []
        if not returncode:
            for file in par2temp.listdir():
                files_to_transfer.append(par2temp.append(file))

        method(source_path, remote_filename)
        for file in files_to_transfer:
            method(file, file.get_filename())

        par2temp.deltree()