Pexpect不支持超时

Question

pexpect不支持超时。

import pexpect
import sys
import os
os.system("""git config --global user.name '#{git_name}'""")
os.system("""git config --global user.email '#{git_email}'""")
child = pexpect.spawn ('git clone https://github.com/davidmontgom/rtbopsConfig.git')
child.logfile = sys.stdout
child.expect ('Username:*')
child.sendline ('#{git_username}')
child.expect ('Pass*')
child.sendline ('#{git_password}')
child.expect(pexpect.EOF, timeout=420)
os.system('cd /home/ubuntu/workspace/rtbopsConfig; git checkout #{branch_name}')


Receiving objects:  16% (1751/10655), 19.36 MiB | 876 KiB/s     KiB/s   
Receiving objects:  16% (1751/10655), 20.64 MiB | 861 KiB/s
103.4.112.50 
103.4.112.50 STDERR: Traceback (most recent call last):
103.4.112.50 
103.4.112.50   File "/tmp/chef-script20121006-19825-5yog10", line 12, in <module>
103.4.112.50 
103.4.112.50     child.expect(pexpect.EOF)
103.4.112.50 
103.4.112.50   File "/usr/local/lib/python2.7/dist-packages/pexpect-2.4-py2.7.egg/pexpect.py", line 1316, in expect
103.4.112.50 
103.4.112.50     return self.expect_list(compiled_pattern_list, timeout, searchwindowsize)
103.4.112.50 
103.4.112.50   File "/usr/local/lib/python2.7/dist-packages/pexpect-2.4-py2.7.egg/pexpect.py", line 1330, in expect_list
103.4.112.50 
103.4.112.50     return self.expect_loop(searcher_re(pattern_list), timeout, searchwindowsize)
103.4.112.50 
103.4.112.50   File "/usr/local/lib/python2.7/dist-packages/pexpect-2.4-py2.7.egg/pexpect.py", line 1414, in expect_loop
103.4.112.50 
103.4.112.50     raise TIMEOUT (str(e) + '\n' + str(self))
103.4.112.50 
103.4.112.50 pexpect.TIMEOUT: Timeout exceeded in read_nonblocking().
103.4.112.50 
103.4.112.50 <pexpect.spawn object at 0x7fbb24704750>
103.4.112.50 
103.4.112.50 version: 2.4 ($Revision: 516 $)
103.4.112.50 
103.4.112.50 command: /usr/bin/git
103.4.112.50 
103.4.112.50 args: ['/usr/bin/git', 'clone', 'https://github.com/davidmontgom/rtbopsConfig.git']
103.4.112.50 
103.4.112.50 searcher: searcher_re:
103.4.112.50 
103.4.112.50     0: EOF
103.4.112.50 
Receiving objects:  16% (1751/10655), 20.64 MiB | 861 KiB/s   873 KiB/s   
103.4.112.50 
Receiving objects:  16% (1751/10655), 20.64 MiB | 861 KiB/s   873 KiB/s   
103.4.112.50 
103.4.112.50 after: <class 'pexpect.TIMEOUT'>

怎样才能让pexpect工作呢？

Answer 1

pexpect会在超时时引发异常(默认在30秒内)。如果不希望出现异常，请将pexpect.TIMEOUT指定为.expect()的模式。

在您的示例中，git clone在.expect(pexpect.EOF)上的默认超时后生成pexpect.Timeout异常。尝试：

i = child.expect([EOF, TIMEOUT], timeout=git_clone_timeout)
if i == 1: 
    # handle timeout

Answer 2

让超时起作用的另一种方式：

try:
    child.expect([],timeout=300)
except pexpect.EOF:
    #do somthing
except pexpect.TIMEOUT:
    #do somthing