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Ignores ControlPersist broken pipe errors. Fixes #16731

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Ansible will now automatically retry a connection if SSH returns an error:

mux_client_hello_exchange: write packet: Broken pipe

This is probably a bug in SSH, but because it's safe to retry this
connection there is no need for Ansible to fail because of it.
This commit is contained in:
Strahinja Kustudić 2017-04-07 12:06:29 +02:00 committed by Toshio Kuratomi
parent 13b2f11139
commit 9f0be5a556
2 changed files with 23 additions and 7 deletions
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16
lib/ansible/plugins/connection/ssh.py
View file

@ -131,6 +131,10 @@ except ImportError:
SSHPASS_AVAILABLE = None
class AnsibleControlPersistBrokenPipeError(AnsibleError):
''' ControlPersist broken pipe '''
pass
def _ssh_retry(func):
"""
Decorator to retry ssh/scp/sftp in the case of a connection failure
@ -147,12 +151,18 @@ def _ssh_retry(func):
remaining_tries = int(C.ANSIBLE_SSH_RETRIES) + 1
cmd_summary = "%s..." % args[0]
for attempt in range(remaining_tries):
try:
try:
return_tuple = func(self, *args, **kwargs)
display.vvv(return_tuple, host=self.host)
# 0 = success
# 1-254 = remote command return code
# 255 = failure from the ssh command itself
except (AnsibleControlPersistBrokenPipeError) as e:
# Retry one more time because of the ControlPersist broken pipe (see #16731)
display.vvv(u"RETRYING BECAUSE OF CONTROLPERSIST BROKEN PIPE")
return_tuple = func(self, *args, **kwargs)
if return_tuple[0] != 255:
break
else:
@ -744,6 +754,12 @@ class Connection(ConnectionBase):
raise AnsibleError('using -c ssh on certain older ssh versions may not support ControlPersist, set ANSIBLE_SSH_ARGS="" '
'(or ssh_args in [ssh_connection] section of the config file) before running again')
# If we find a broken pipe because of ControlPersist timeout expiring (see #16731),
# we raise a special exception so that we can retry a connection.
controlpersist_broken_pipe = b'mux_client_hello_exchange: write packet: Broken pipe' in b_stderr
if p.returncode == 255 and controlpersist_broken_pipe:
raise AnsibleControlPersistBrokenPipeError('SSH Error: data could not be sent because of ControlPersist broken pipe.')
if p.returncode == 255 and in_data and checkrc:
raise AnsibleConnectionFailure('SSH Error: data could not be sent to remote host "%s". Make sure this host can be reached over ssh' % self.host)

4
test/units/plugins/connection/test_ssh.py
View file

@ -590,7 +590,7 @@ class TestSSHConnectionRetries(object):
self.mock_popen_res.stdout.read.side_effect = [b"", b"my_stdout\n", b"second_line"]
self.mock_popen_res.stderr.read.side_effect = [b"", b"my_stderr"]
type(self.mock_popen_res).returncode = PropertyMock(side_effect=[255] * 3 + [0] * 4)
type(self.mock_popen_res).returncode = PropertyMock(side_effect=[255] * 4 + [0] * 4)
self.mock_selector.select.side_effect = [
[(SelectorKey(self.mock_popen_res.stdout, 1001, [EVENT_READ], None), EVENT_READ)],
@ -621,7 +621,7 @@ class TestSSHConnectionRetries(object):
self.mock_popen_res.stdout.read.side_effect = [b"", b"my_stdout\n", b"second_line"]
self.mock_popen_res.stderr.read.side_effect = [b"", b"my_stderr"]
type(self.mock_popen_res).returncode = PropertyMock(side_effect=[255] * 3 + [0] * 4)
type(self.mock_popen_res).returncode = PropertyMock(side_effect=[255] * 4 + [0] * 4)
self.mock_selector.select.side_effect = [
[(SelectorKey(self.mock_popen_res.stdout, 1001, [EVENT_READ], None), EVENT_READ)],