Extend SSH Retry to put_file and fetch_file (#20187)
* Move retry logic into _ssh_retry decorator, and apply to exec_command, put_file and fetch_file * Update tests to reflect change * Move _ssh_retry to _run, and update tests to reflect * piped should use exec_command instead of removed _exec_command * Rework tests to support selectors instead of select.select
This commit is contained in:
Matt Martz
James Cammarata
parent
911600acf9
commit
1fe67f9f43
2 changed files with 206 additions and 104 deletions
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@ -29,6 +29,7 @@ import socket
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import subprocess
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import time
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from functools import wraps
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from ansible import constants as C
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from ansible.compat import selectors
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from ansible.compat.six import PY3, text_type, binary_type
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@ -51,6 +52,54 @@ except ImportError:
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SSHPASS_AVAILABLE = None
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def _ssh_retry(func):
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"""
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Decorator to retry ssh/scp/sftp in the case of a connection failure
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Will retry if:
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* an exception is caught
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* ssh returns 255
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Will not retry if
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* remaining_tries is <2
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* retries limit reached
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"""
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@wraps(func)
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def wrapped(self, *args, **kwargs):
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remaining_tries = int(C.ANSIBLE_SSH_RETRIES) + 1
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cmd_summary = "%s..." % args[0]
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for attempt in range(remaining_tries):
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try:
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return_tuple = func(self, *args, **kwargs)
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display.vvv(return_tuple, host=self.host)
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# 0 = success
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# 1-254 = remote command return code
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# 255 = failure from the ssh command itself
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if return_tuple[0] != 255:
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break
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else:
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raise AnsibleConnectionFailure("Failed to connect to the host via ssh: %s" % to_native(return_tuple[2]))
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except (AnsibleConnectionFailure, Exception) as e:
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if attempt == remaining_tries - 1:
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raise
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else:
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pause = 2 ** attempt - 1
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if pause > 30:
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pause = 30
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if isinstance(e, AnsibleConnectionFailure):
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msg = "ssh_retry: attempt: %d, ssh return code is 255. cmd (%s), pausing for %d seconds" % (attempt, cmd_summary, pause)
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else:
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msg = "ssh_retry: attempt: %d, caught exception(%s) from cmd (%s), pausing for %d seconds" % (attempt, e, cmd_summary, pause)
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display.vv(msg, host=self.host)
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time.sleep(pause)
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continue
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return return_tuple
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return wrapped
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class Connection(ConnectionBase):
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''' ssh based connections '''
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@ -352,6 +401,7 @@ class Connection(ConnectionBase):
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return b''.join(output), remainder
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@_ssh_retry
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def _run(self, cmd, in_data, sudoable=True, checkrc=True):
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'''
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Starts the command and communicates with it until it ends.
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@ -618,28 +668,6 @@ class Connection(ConnectionBase):
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return (p.returncode, b_stdout, b_stderr)
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def _exec_command(self, cmd, in_data=None, sudoable=True):
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''' run a command on the remote host '''
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super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
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display.vvv(u"ESTABLISH SSH CONNECTION FOR USER: {0}".format(self._play_context.remote_user), host=self._play_context.remote_addr)
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# we can only use tty when we are not pipelining the modules. piping
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# data into /usr/bin/python inside a tty automatically invokes the
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# python interactive-mode but the modules are not compatible with the
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# interactive-mode ("unexpected indent" mainly because of empty lines)
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if not in_data and sudoable:
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args = ('ssh', '-tt', self.host, cmd)
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else:
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args = ('ssh', self.host, cmd)
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cmd = self._build_command(*args)
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(returncode, stdout, stderr) = self._run(cmd, in_data, sudoable=sudoable)
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return (returncode, stdout, stderr)
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def _file_transport_command(self, in_path, out_path, sftp_action):
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# scp and sftp require square brackets for IPv6 addresses, but
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# accept them for hostnames and IPv4 addresses too.
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@ -674,7 +702,6 @@ class Connection(ConnectionBase):
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methods = ['sftp']
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success = False
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res = None
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for method in methods:
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returncode = stdout = stderr = None
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if method == 'sftp':
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@ -693,77 +720,58 @@ class Connection(ConnectionBase):
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if sftp_action == 'get':
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# we pass sudoable=False to disable pty allocation, which
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# would end up mixing stdout/stderr and screwing with newlines
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(returncode, stdout, stderr) = self._exec_command('dd if=%s bs=%s' % (in_path, BUFSIZE), sudoable=False)
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(returncode, stdout, stderr) = self.exec_command('dd if=%s bs=%s' % (in_path, BUFSIZE), sudoable=False)
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out_file = open(to_bytes(out_path, errors='surrogate_or_strict'), 'wb+')
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out_file.write(stdout)
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out_file.close()
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else:
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in_data = open(to_bytes(in_path, errors='surrogate_or_strict'), 'rb').read()
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in_data = to_bytes(in_data, nonstring='passthru')
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(returncode, stdout, stderr) = self._exec_command('dd of=%s bs=%s' % (out_path, BUFSIZE), in_data=in_data)
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(returncode, stdout, stderr) = self.exec_command('dd of=%s bs=%s' % (out_path, BUFSIZE), in_data=in_data)
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# Check the return code and rollover to next method if failed
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if returncode == 0:
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success = True
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break
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return (returncode, stdout, stderr)
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else:
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# If not in smart mode, the data will be printed by the raise below
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if len(methods) > 1:
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display.warning(msg='%s transfer mechanism failed on %s. Use ANSIBLE_DEBUG=1 to see detailed information' % (method, host))
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display.debug(msg='%s' % to_native(stdout))
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display.debug(msg='%s' % to_native(stderr))
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res = (returncode, stdout, stderr)
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if not success:
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raise AnsibleError("failed to transfer file {0} to {1}:\n{2}\n{3}"\
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.format(to_native(in_path), to_native(out_path), to_native(res[1]), to_native(res[2])))
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if returncode == 255:
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raise AnsibleConnectionFailure("Failed to connect to the host via %s: %s" % (method, to_native(stderr)))
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else:
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raise AnsibleError("failed to transfer file to {0} {1}:\n{2}\n{3}"\
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.format(to_native(in_path), to_native(out_path), to_native(stdout), to_native(stderr)))
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#
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# Main public methods
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#
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def exec_command(self, *args, **kwargs):
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"""
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Wrapper around _exec_command to retry in the case of an ssh failure
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def exec_command(self, cmd, in_data=None, sudoable=True):
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''' run a command on the remote host '''
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Will retry if:
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* an exception is caught
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* ssh returns 255
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Will not retry if
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* remaining_tries is <2
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* retries limit reached
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"""
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super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
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remaining_tries = int(C.ANSIBLE_SSH_RETRIES) + 1
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cmd_summary = "%s..." % args[0]
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for attempt in range(remaining_tries):
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try:
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return_tuple = self._exec_command(*args, **kwargs)
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# 0 = success
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# 1-254 = remote command return code
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# 255 = failure from the ssh command itself
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if return_tuple[0] != 255:
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break
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else:
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raise AnsibleConnectionFailure("Failed to connect to the host via ssh: %s" % to_native(return_tuple[2]))
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except (AnsibleConnectionFailure, Exception) as e:
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if attempt == remaining_tries - 1:
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raise
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else:
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pause = 2 ** attempt - 1
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if pause > 30:
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pause = 30
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display.vvv(u"ESTABLISH SSH CONNECTION FOR USER: {0}".format(self._play_context.remote_user), host=self._play_context.remote_addr)
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if isinstance(e, AnsibleConnectionFailure):
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msg = "ssh_retry: attempt: %d, ssh return code is 255. cmd (%s), pausing for %d seconds" % (attempt, cmd_summary, pause)
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else:
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msg = "ssh_retry: attempt: %d, caught exception(%s) from cmd (%s), pausing for %d seconds" % (attempt, e, cmd_summary, pause)
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display.vv(msg, host=self.host)
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# we can only use tty when we are not pipelining the modules. piping
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# data into /usr/bin/python inside a tty automatically invokes the
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# python interactive-mode but the modules are not compatible with the
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# interactive-mode ("unexpected indent" mainly because of empty lines)
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time.sleep(pause)
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continue
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ssh_executable = self._play_context.ssh_executable
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return return_tuple
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if not in_data and sudoable:
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args = (ssh_executable, '-tt', self.host, cmd)
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else:
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args = (ssh_executable, self.host, cmd)
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cmd = self._build_command(*args)
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(returncode, stdout, stderr) = self._run(cmd, in_data, sudoable=sudoable)
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return (returncode, stdout, stderr)
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def put_file(self, in_path, out_path):
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''' transfer a file from local to remote '''
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@ -774,7 +782,7 @@ class Connection(ConnectionBase):
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if not os.path.exists(to_bytes(in_path, errors='surrogate_or_strict')):
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raise AnsibleFileNotFound("file or module does not exist: {0}".format(to_native(in_path)))
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self._file_transport_command(in_path, out_path, 'put')
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return self._file_transport_command(in_path, out_path, 'put')
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def fetch_file(self, in_path, out_path):
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''' fetch a file from remote to local '''
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@ -782,7 +790,7 @@ class Connection(ConnectionBase):
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super(Connection, self).fetch_file(in_path, out_path)
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display.vvv(u"FETCH {0} TO {1}".format(in_path, out_path), host=self.host)
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self._file_transport_command(in_path, out_path, 'get')
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return self._file_transport_command(in_path, out_path, 'get')
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def reset(self):
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# If we have a persistent ssh connection (ControlPersist), we can ask it to stop listening.
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@ -25,7 +25,7 @@ from io import StringIO
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import pytest
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from ansible.compat.tests import unittest
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from ansible.compat.tests.mock import patch, MagicMock
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from ansible.compat.tests.mock import patch, MagicMock, PropertyMock
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from ansible import constants as C
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from ansible.compat.selectors import SelectorKey, EVENT_READ
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@ -72,7 +72,7 @@ class TestConnectionBaseClass(unittest.TestCase):
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conn = ssh.Connection(pc, new_stdin)
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conn._build_command('ssh')
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def test_plugins_connection_ssh__exec_command(self):
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def test_plugins_connection_ssh_exec_command(self):
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pc = PlayContext()
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new_stdin = StringIO()
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conn = ssh.Connection(pc, new_stdin)
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@ -82,8 +82,8 @@ class TestConnectionBaseClass(unittest.TestCase):
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conn._run = MagicMock()
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conn._run.return_value = (0, 'stdout', 'stderr')
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res, stdout, stderr = conn._exec_command('ssh')
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res, stdout, stderr = conn._exec_command('ssh', 'this is some data')
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res, stdout, stderr = conn.exec_command('ssh')
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res, stdout, stderr = conn.exec_command('ssh', 'this is some data')
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def test_plugins_connection_ssh__examine_output(self):
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pc = PlayContext()
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@ -193,36 +193,8 @@ class TestConnectionBaseClass(unittest.TestCase):
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self.assertTrue(conn._flags['become_nopasswd_error'])
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@patch('time.sleep')
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def test_plugins_connection_ssh_exec_command(self, mock_sleep):
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pc = PlayContext()
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new_stdin = StringIO()
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conn = ssh.Connection(pc, new_stdin)
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conn._build_command = MagicMock()
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conn._exec_command = MagicMock()
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C.ANSIBLE_SSH_RETRIES = 9
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# test a regular, successful execution
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conn._exec_command.return_value = (0, b'stdout', b'')
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res = conn.exec_command('ssh', 'some data')
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self.assertEquals(res, (0, b'stdout', b''), msg='exec_command did not return what the _exec_command helper returned')
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# test a retry, followed by success
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conn._exec_command.return_value = None
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conn._exec_command.side_effect = [(255, '', ''), (0, b'stdout', b'')]
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res = conn.exec_command('ssh', 'some data')
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self.assertEquals(res, (0, b'stdout', b''), msg='exec_command did not return what the _exec_command helper returned')
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# test multiple failures
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conn._exec_command.side_effect = [(255, b'', b'')] * 10
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self.assertRaises(AnsibleConnectionFailure, conn.exec_command, 'ssh', 'some data')
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# test other failure from exec_command
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conn._exec_command.side_effect = [Exception('bad')] * 10
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self.assertRaises(Exception, conn.exec_command, 'ssh', 'some data')
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@patch('os.path.exists')
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def test_plugins_connection_ssh_put_file(self, mock_ospe):
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def test_plugins_connection_ssh_put_file(self, mock_ospe, mock_sleep):
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pc = PlayContext()
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new_stdin = StringIO()
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conn = ssh.Connection(pc, new_stdin)
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@ -234,6 +206,8 @@ class TestConnectionBaseClass(unittest.TestCase):
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conn._run.return_value = (0, '', '')
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conn.host = "some_host"
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C.ANSIBLE_SSH_RETRIES = 9
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# Test with C.DEFAULT_SCP_IF_SSH set to smart
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# Test when SFTP works
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C.DEFAULT_SCP_IF_SSH = 'smart'
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@ -276,7 +250,8 @@ class TestConnectionBaseClass(unittest.TestCase):
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conn._run.return_value = (0, 'stdout', '')
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self.assertRaises(AnsibleFileNotFound, conn.put_file, '/path/to/bad/file', '/remote/path/to/file')
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def test_plugins_connection_ssh_fetch_file(self):
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@patch('time.sleep')
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def test_plugins_connection_ssh_fetch_file(self, mock_sleep):
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pc = PlayContext()
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new_stdin = StringIO()
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conn = ssh.Connection(pc, new_stdin)
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@ -287,6 +262,8 @@ class TestConnectionBaseClass(unittest.TestCase):
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conn._run.return_value = (0, '', '')
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conn.host = "some_host"
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C.ANSIBLE_SSH_RETRIES = 9
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# Test with C.DEFAULT_SCP_IF_SSH set to smart
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# Test when SFTP works
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C.DEFAULT_SCP_IF_SSH = 'smart'
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@ -535,3 +512,120 @@ class TestSSHConnectionRun(object):
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assert self.mock_selector.register.called is True
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assert self.mock_selector.register.call_count == 2
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assert self.conn._send_initial_data.called is False
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@pytest.mark.usefixtures('mock_run_env')
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class TestSSHConnectionRetries(object):
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def test_retry_then_success(self):
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self.mock_popen_res.stdout.read.side_effect = [b"", b"my_stdout\n", b"second_line"]
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self.mock_popen_res.stderr.read.side_effect = [b"", b"my_stderr"]
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type(self.mock_popen_res).returncode = PropertyMock(side_effect=[255] * 3 + [0] * 4)
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self.mock_selector.select.side_effect = [
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[(SelectorKey(self.mock_popen_res.stdout, 1001, [EVENT_READ], None), EVENT_READ)],
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[(SelectorKey(self.mock_popen_res.stderr, 1002, [EVENT_READ], None), EVENT_READ)],
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[],
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[(SelectorKey(self.mock_popen_res.stdout, 1001, [EVENT_READ], None), EVENT_READ)],
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[(SelectorKey(self.mock_popen_res.stdout, 1001, [EVENT_READ], None), EVENT_READ)],
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[(SelectorKey(self.mock_popen_res.stderr, 1002, [EVENT_READ], None), EVENT_READ)],
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[]
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]
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self.mock_selector.get_map.side_effect = lambda: True
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self.conn._build_command = MagicMock()
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self.conn._build_command.return_value = 'ssh'
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return_code, b_stdout, b_stderr = self.conn.exec_command('ssh', 'some data')
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assert return_code == 0
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assert b_stdout == b'my_stdout\nsecond_line'
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assert b_stderr == b'my_stderr'
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@patch('time.sleep')
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def test_multiple_failures(self, mock_sleep):
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C.ANSIBLE_SSH_RETRIES = 9
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self.mock_popen_res.stdout.read.side_effect = [b""] * 11
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self.mock_popen_res.stderr.read.side_effect = [b""] * 11
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type(self.mock_popen_res).returncode = PropertyMock(side_effect=[255] * 30)
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self.mock_selector.select.side_effect = [
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[(SelectorKey(self.mock_popen_res.stdout, 1001, [EVENT_READ], None), EVENT_READ)],
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[(SelectorKey(self.mock_popen_res.stderr, 1002, [EVENT_READ], None), EVENT_READ)],
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[],
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] * 10
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self.mock_selector.get_map.side_effect = lambda: True
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self.conn._build_command = MagicMock()
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self.conn._build_command.return_value = 'ssh'
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pytest.raises(AnsibleConnectionFailure, self.conn.exec_command, 'ssh', 'some data')
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assert self.mock_popen.call_count == 10
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@patch('time.sleep')
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def test_abitrary_exceptions(self, mock_sleep):
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C.ANSIBLE_SSH_RETRIES = 9
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self.conn._build_command = MagicMock()
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self.conn._build_command.return_value = 'ssh'
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self.mock_popen.side_effect = [Exception('bad')] * 10
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pytest.raises(Exception, self.conn.exec_command, 'ssh', 'some data')
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assert self.mock_popen.call_count == 10
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@patch('time.sleep')
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@patch('ansible.plugins.connection.ssh.os')
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def test_put_file_retries(self, os_mock, time_mock):
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os_mock.path.exists.return_value = True
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self.mock_popen_res.stdout.read.side_effect = [b"", b"my_stdout\n", b"second_line"]
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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)
|
||||
|
||||
self.mock_selector.select.side_effect = [
|
||||
[(SelectorKey(self.mock_popen_res.stdout, 1001, [EVENT_READ], None), EVENT_READ)],
|
||||
[(SelectorKey(self.mock_popen_res.stderr, 1002, [EVENT_READ], None), EVENT_READ)],
|
||||
[],
|
||||
[(SelectorKey(self.mock_popen_res.stdout, 1001, [EVENT_READ], None), EVENT_READ)],
|
||||
[(SelectorKey(self.mock_popen_res.stdout, 1001, [EVENT_READ], None), EVENT_READ)],
|
||||
[(SelectorKey(self.mock_popen_res.stderr, 1002, [EVENT_READ], None), EVENT_READ)],
|
||||
[]
|
||||
]
|
||||
self.mock_selector.get_map.side_effect = lambda: True
|
||||
|
||||
self.conn._build_command = MagicMock()
|
||||
self.conn._build_command.return_value = 'ssh'
|
||||
|
||||
return_code, b_stdout, b_stderr = self.conn.put_file('/path/to/in/file', '/path/to/dest/file')
|
||||
assert return_code == 0
|
||||
assert b_stdout == b"my_stdout\nsecond_line"
|
||||
assert b_stderr == b"my_stderr"
|
||||
assert self.mock_popen.call_count == 2
|
||||
|
||||
@patch('time.sleep')
|
||||
@patch('ansible.plugins.connection.ssh.os')
|
||||
def test_fetch_file_retries(self, os_mock, time_mock):
|
||||
os_mock.path.exists.return_value = True
|
||||
|
||||
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)
|
||||
|
||||
self.mock_selector.select.side_effect = [
|
||||
[(SelectorKey(self.mock_popen_res.stdout, 1001, [EVENT_READ], None), EVENT_READ)],
|
||||
[(SelectorKey(self.mock_popen_res.stderr, 1002, [EVENT_READ], None), EVENT_READ)],
|
||||
[],
|
||||
[(SelectorKey(self.mock_popen_res.stdout, 1001, [EVENT_READ], None), EVENT_READ)],
|
||||
[(SelectorKey(self.mock_popen_res.stdout, 1001, [EVENT_READ], None), EVENT_READ)],
|
||||
[(SelectorKey(self.mock_popen_res.stderr, 1002, [EVENT_READ], None), EVENT_READ)],
|
||||
[]
|
||||
]
|
||||
self.mock_selector.get_map.side_effect = lambda: True
|
||||
|
||||
self.conn._build_command = MagicMock()
|
||||
self.conn._build_command.return_value = 'ssh'
|
||||
|
||||
return_code, b_stdout, b_stderr = self.conn.fetch_file('/path/to/in/file', '/path/to/dest/file')
|
||||
assert return_code == 0
|
||||
assert b_stdout == b"my_stdout\nsecond_line"
|
||||
assert b_stderr == b"my_stderr"
|
||||
assert self.mock_popen.call_count == 2
|
||||
|
|
|
|||
Loading…
Reference in a new issue