rsync退出值

Question

我在rsync手册中读到rsync返回0- 35范围内退出值。

我尝试使用以下代码捕获rsync的输出：

import subprocess, time, os, sys
cmd = ["rsync", "-avuxz", "/etc/passwd" ,"/tmp1/"]

p = subprocess.Popen(cmd,
                     stdout=subprocess.PIPE,
                     stderr=subprocess.STDOUT)

for line in p.stdout:
    print line.rstrip()

使用上面的程序，我捕获了rsync的以下输出：

rsync: mkdir "/tmp1" failed: Permission denied (13)
rsync error: error in file IO (code 11) at main.c(587) [Receiver=3.0.9]
rsync: connection unexpectedly closed (9 bytes received so far) [sender]
rsync error: error in rsync protocol data stream (code 12) at io.c(605) [sender=3.0.9]

我的问题：

• Is the rsync output is only as text (如上所述)？
• 如何区分成功(代码0)和错误？

(假设:如果成功，p.stdout的长度将为零，其他任何内容都是失败的，这样的假设正确吗？)

Answer 1

您可以通过returncode属性访问Popen对象进程的返回码。如果它的值为None，则说明该过程尚未完成；请稍后再检查。

例如：

p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)

# Dumb way to wait for the process to complete
while p.returncode is None:
    os.sleep(1)
if p.returncode:
    print "Error, rsync exited with non-zero status"
else:
    print "Success, rsync exited with zero status"