b1b93c7a22
* [2.7] Clean up after ansible-connection if failure occurred in start() (#45929)
(cherry picked from commit 0d143ed)
Co-authored-by: Nathaniel Case <this.is@nathanielca.se>
* Add changelog fragment
323 lines
11 KiB
Python
Executable file
323 lines
11 KiB
Python
Executable file
#!/usr/bin/env python
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# Copyright: (c) 2017, Ansible Project
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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__requires__ = ['ansible']
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try:
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import pkg_resources
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except Exception:
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pass
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import fcntl
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import hashlib
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import os
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import signal
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import socket
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import sys
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import time
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import traceback
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import errno
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import json
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from contextlib import contextmanager
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from ansible import constants as C
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from ansible.module_utils._text import to_bytes, to_text
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from ansible.module_utils.six import PY3
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from ansible.module_utils.six.moves import cPickle, StringIO
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from ansible.module_utils.connection import Connection, ConnectionError, send_data, recv_data
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from ansible.module_utils.service import fork_process
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from ansible.playbook.play_context import PlayContext
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from ansible.plugins.loader import connection_loader
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from ansible.utils.path import unfrackpath, makedirs_safe
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from ansible.utils.display import Display
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from ansible.utils.jsonrpc import JsonRpcServer
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def read_stream(byte_stream):
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size = int(byte_stream.readline().strip())
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data = byte_stream.read(size)
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if len(data) < size:
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raise Exception("EOF found before data was complete")
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data_hash = to_text(byte_stream.readline().strip())
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if data_hash != hashlib.sha1(data).hexdigest():
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raise Exception("Read {0} bytes, but data did not match checksum".format(size))
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# restore escaped loose \r characters
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data = data.replace(br'\r', b'\r')
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return data
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@contextmanager
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def file_lock(lock_path):
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"""
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Uses contextmanager to create and release a file lock based on the
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given path. This allows us to create locks using `with file_lock()`
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to prevent deadlocks related to failure to unlock properly.
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"""
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lock_fd = os.open(lock_path, os.O_RDWR | os.O_CREAT, 0o600)
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fcntl.lockf(lock_fd, fcntl.LOCK_EX)
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yield
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fcntl.lockf(lock_fd, fcntl.LOCK_UN)
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os.close(lock_fd)
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class ConnectionProcess(object):
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'''
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The connection process wraps around a Connection object that manages
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the connection to a remote device that persists over the playbook
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'''
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def __init__(self, fd, play_context, socket_path, original_path, ansible_playbook_pid=None):
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self.play_context = play_context
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self.socket_path = socket_path
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self.original_path = original_path
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self.fd = fd
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self.exception = None
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self.srv = JsonRpcServer()
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self.sock = None
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self.connection = None
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self._ansible_playbook_pid = ansible_playbook_pid
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def start(self, variables):
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try:
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messages = list()
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result = {}
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messages.append('control socket path is %s' % self.socket_path)
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# If this is a relative path (~ gets expanded later) then plug the
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# key's path on to the directory we originally came from, so we can
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# find it now that our cwd is /
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if self.play_context.private_key_file and self.play_context.private_key_file[0] not in '~/':
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self.play_context.private_key_file = os.path.join(self.original_path, self.play_context.private_key_file)
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self.connection = connection_loader.get(self.play_context.connection, self.play_context, '/dev/null',
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ansible_playbook_pid=self._ansible_playbook_pid)
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self.connection.set_options(var_options=variables)
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self.connection._connect()
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self.connection._socket_path = self.socket_path
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self.srv.register(self.connection)
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messages.extend(sys.stdout.getvalue().splitlines())
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messages.append('connection to remote device started successfully')
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self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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self.sock.bind(self.socket_path)
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self.sock.listen(1)
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messages.append('local domain socket listeners started successfully')
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except Exception as exc:
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result['error'] = to_text(exc)
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result['exception'] = traceback.format_exc()
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finally:
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result['messages'] = messages
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self.fd.write(json.dumps(result))
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self.fd.close()
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def run(self):
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try:
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while self.connection.connected:
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signal.signal(signal.SIGALRM, self.connect_timeout)
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signal.signal(signal.SIGTERM, self.handler)
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signal.alarm(self.connection.get_option('persistent_connect_timeout'))
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self.exception = None
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(s, addr) = self.sock.accept()
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signal.alarm(0)
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signal.signal(signal.SIGALRM, self.command_timeout)
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while True:
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data = recv_data(s)
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if not data:
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break
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signal.alarm(self.connection.get_option('persistent_command_timeout'))
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resp = self.srv.handle_request(data)
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signal.alarm(0)
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send_data(s, to_bytes(resp))
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s.close()
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except Exception as e:
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# socket.accept() will raise EINTR if the socket.close() is called
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if hasattr(e, 'errno'):
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if e.errno != errno.EINTR:
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self.exception = traceback.format_exc()
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else:
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self.exception = traceback.format_exc()
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finally:
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# allow time for any exception msg send over socket to receive at other end before shutting down
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time.sleep(0.1)
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# when done, close the connection properly and cleanup the socket file so it can be recreated
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self.shutdown()
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def connect_timeout(self, signum, frame):
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msg = 'persistent connection idle timeout triggered, timeout value is %s secs.\nSee the timeout setting options in the Network Debug and ' \
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'Troubleshooting Guide.' % self.connection.get_option('persistent_connect_timeout')
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display.display(msg, log_only=True)
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raise Exception(msg)
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def command_timeout(self, signum, frame):
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msg = 'command timeout triggered, timeout value is %s secs.\nSee the timeout setting options in the Network Debug and Troubleshooting Guide.'\
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% self.connection.get_option('persistent_command_timeout')
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display.display(msg, log_only=True)
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raise Exception(msg)
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def handler(self, signum, frame):
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msg = 'signal handler called with signal %s.' % signum
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display.display(msg, log_only=True)
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raise Exception(msg)
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def shutdown(self):
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""" Shuts down the local domain socket
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"""
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if os.path.exists(self.socket_path):
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try:
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if self.sock:
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self.sock.close()
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if self.connection:
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self.connection.close()
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except:
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pass
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finally:
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if os.path.exists(self.socket_path):
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os.remove(self.socket_path)
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setattr(self.connection, '_socket_path', None)
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setattr(self.connection, '_connected', False)
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display.display('shutdown complete', log_only=True)
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def main():
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""" Called to initiate the connect to the remote device
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"""
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rc = 0
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result = {}
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messages = list()
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socket_path = None
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# Need stdin as a byte stream
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if PY3:
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stdin = sys.stdin.buffer
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else:
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stdin = sys.stdin
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# Note: update the below log capture code after Display.display() is refactored.
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saved_stdout = sys.stdout
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sys.stdout = StringIO()
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try:
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# read the play context data via stdin, which means depickling it
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vars_data = read_stream(stdin)
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init_data = read_stream(stdin)
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if PY3:
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pc_data = cPickle.loads(init_data, encoding='bytes')
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variables = cPickle.loads(vars_data, encoding='bytes')
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else:
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pc_data = cPickle.loads(init_data)
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variables = cPickle.loads(vars_data)
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play_context = PlayContext()
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play_context.deserialize(pc_data)
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display.verbosity = play_context.verbosity
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except Exception as e:
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rc = 1
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result.update({
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'error': to_text(e),
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'exception': traceback.format_exc()
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})
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if rc == 0:
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ssh = connection_loader.get('ssh', class_only=True)
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ansible_playbook_pid = sys.argv[1]
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cp = ssh._create_control_path(play_context.remote_addr, play_context.port, play_context.remote_user, play_context.connection, ansible_playbook_pid)
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# create the persistent connection dir if need be and create the paths
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# which we will be using later
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tmp_path = unfrackpath(C.PERSISTENT_CONTROL_PATH_DIR)
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makedirs_safe(tmp_path)
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lock_path = unfrackpath("%s/.ansible_pc_lock_%s" % (tmp_path, play_context.remote_addr))
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socket_path = unfrackpath(cp % dict(directory=tmp_path))
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with file_lock(lock_path):
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if not os.path.exists(socket_path):
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messages.append('local domain socket does not exist, starting it')
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original_path = os.getcwd()
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r, w = os.pipe()
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pid = fork_process()
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if pid == 0:
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try:
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os.close(r)
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wfd = os.fdopen(w, 'w')
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process = ConnectionProcess(wfd, play_context, socket_path, original_path, ansible_playbook_pid)
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process.start(variables)
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except Exception:
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messages.append(traceback.format_exc())
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rc = 1
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if rc == 0:
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process.run()
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else:
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process.shutdown()
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sys.exit(rc)
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else:
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os.close(w)
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rfd = os.fdopen(r, 'r')
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data = json.loads(rfd.read())
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messages.extend(data.pop('messages'))
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result.update(data)
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else:
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messages.append('found existing local domain socket, using it!')
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conn = Connection(socket_path)
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conn.set_options(var_options=variables)
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pc_data = to_text(init_data)
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try:
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messages.extend(conn.update_play_context(pc_data))
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except Exception as exc:
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# Only network_cli has update_play context, so missing this is
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# not fatal e.g. netconf
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if isinstance(exc, ConnectionError) and getattr(exc, 'code', None) == -32601:
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pass
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else:
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result.update({
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'error': to_text(exc),
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'exception': traceback.format_exc()
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})
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messages.append(sys.stdout.getvalue())
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result.update({
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'messages': messages,
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'socket_path': socket_path
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})
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sys.stdout = saved_stdout
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if 'exception' in result:
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rc = 1
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sys.stderr.write(json.dumps(result))
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else:
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rc = 0
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sys.stdout.write(json.dumps(result))
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sys.exit(rc)
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if __name__ == '__main__':
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display = Display()
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main()
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