Question

OpenSolaris derivate (NexentaStor), python 2.5.5

我见过很多例子，很多例子似乎表明问题是僵局。我不是写stdin所以我认为问题是其中一个shell命令过早退出。

Popen执行的是：

ssh <remotehost> "zfs send tank/dataset@snapshot | gzip -9" | gzip -d | zfs recv tank/dataset

换句话说，登录到远程主机并（发送存储卷的复制流，将其传输到gzip）将其传输到zfs recv以写入本地数据存储。

我已经看到了关于缓冲区的解释，但是我肯定没有填写那些，并且gzip过早地淘汰了所以我认为process.wait（）永远不会退出。

process = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
process.wait()
if process.returncode == 0:
    for line in process.stdout:
        stdout_arr.append([line])
    return stdout_arr
else:
    return False

这是我跑步和打断时发生的事情

# ./zfs_replication.py 
gzip: stdout: Broken pipe

^CKilled by signal 2.
Traceback (most recent call last):
  File "./zfs_replication.py", line 155, in <module>
   Exec(zfsSendRecv(dataset, today), LOCAL)
  File "./zfs_replication.py", line 83, in Exec
    process.wait()
  File "/usr/lib/python2.5/subprocess.py", line 1184, in wait
    pid, sts = self._waitpid_no_intr(self.pid, 0)
  File "/usr/lib/python2.5/subprocess.py", line 1014, in _waitpid_no_intr
    return os.waitpid(pid, options)
KeyboardInterrupt

我也尝试使用Popen.communicat（）方法，但是如果gzip拯救，它也会挂起。在这种情况下，我的命令的最后一部分（zfs recv）退出，因为本地数据集已被修改，因此将不会应用增量复制流，所以即使这将被修复，也必须有一种处理gzips破解的方法管？

process = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
stdout, stderr = process.communicate()

if process.returncode == 0:
    dosomething()
else:
    dosomethingelse()

跑步时：

cannot receive incremental stream: destination tank/repl_test has been modified

since most recent snapshot
gzip: stdout: Broken pipe

^CKilled by signal 2.Traceback (most recent call last):

  File "./zfs_replication.py", line 154, in <module>
    Exec(zfsSendRecv(dataset, today), LOCAL)
  File "./zfs_replication.py", line 83, in Exec
    stdout, stderr = process.communicate()
  File "/usr/lib/python2.5/subprocess.py", line 662, in communicate
    stdout = self._fo_read_no_intr(self.stdout)
  File "/usr/lib/python2.5/subprocess.py", line 1025, in _fo_read_no_intr
    return obj.read()
KeyboardInterrupt

python子进程Popen挂起

0 个答案: