Ansible源码分析【第四篇】： Ansible源码分析之API
Ansible之API模块Runner
模块目录结构
1、__init__.py文件：相对于类中的构造函数，用来初始化模块。把所在目录当做一个package处理
# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com> # # This file is part of Ansible # # Ansible is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # Ansible is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with Ansible. If not, see <http://www.gnu.org/licenses/>. import multiprocessing # Python实现多进程模块 import signal # 信号 import os # 操作系统相关 import pwd # pwd模块在linux/unix平台下使用，用来获取/etc/passwd 文件的相关信息。可以用来作为获取用户信息的接口。（Python 3已经废弃） import Queue # 队列 import random # 随机数 import traceback # 追踪异常 import tempfile # 创建临时文件 import time # 时间模块 import collections # 内置模块的封装 import socket # socket import base64 # 编码解码 import sys import pipes import jinja2 import subprocess # 执行系统命令 import getpass # 不显示输入的密码信息 import ansible.constants as C import ansible.inventory from ansible import utils from ansible.utils import template from ansible.utils import check_conditional from ansible.utils import string_functions from ansible import errors from ansible import module_common import poller import connection from return_data import ReturnData from ansible.callbacks import DefaultRunnerCallbacks, vv from ansible.module_common import ModuleReplacer from ansible.module_utils.splitter import split_args, unquote from ansible.cache import FactCache from ansible.utils import update_hash module_replacer = ModuleReplacer(strip_comments=False) try: from hashlib import sha1 except ImportError: from sha import sha as sha1 HAS_ATFORK=True try: from Crypto.Random import atfork except ImportError: HAS_ATFORK=False multiprocessing_runner = None OUTPUT_LOCKFILE = tempfile.TemporaryFile() PROCESS_LOCKFILE = tempfile.TemporaryFile() ################################################ def _executor_hook(job_queue, result_queue, new_stdin): # attempt workaround of https://github.com/newsapps/beeswithmachineguns/issues/17 # this function also not present in CentOS 6 if HAS_ATFORK: atfork() signal.signal(signal.SIGINT, signal.SIG_IGN) while not job_queue.empty(): try: host = job_queue.get(block=False) return_data = multiprocessing_runner._executor(host, new_stdin) result_queue.put(return_data) except Queue.Empty: pass except: traceback.print_exc() class HostVars(dict): ''' A special view of vars_cache that adds values from the inventory when needed. ''' def __init__(self, vars_cache, inventory, vault_password=None): self.vars_cache = vars_cache self.inventory = inventory self.lookup = {} self.update(vars_cache) self.vault_password = vault_password def __getitem__(self, host): if host not in self.lookup: result = self.inventory.get_variables(host, vault_password=self.vault_password).copy() result.update(self.vars_cache.get(host, {})) self.lookup[host] = template.template('.', result, self.vars_cache) return self.lookup[host] class Runner(object): ''' core API interface to ansible ''' # see bin/ansible for how this is used... def __init__(self, host_list=C.DEFAULT_HOST_LIST, # ex: /etc/ansible/hosts, legacy usage 可以放静态的hosts文件，也可以放inventory的脚本，权限777 module_path=None, # ex: /usr/share/ansible module_name=C.DEFAULT_MODULE_NAME, # ex: copy 模块的位置/usr/share/ansible，不然不会识别到 module_args=C.DEFAULT_MODULE_ARGS, # ex: "src=/tmp/a dest=/tmp/b" 模块参数 forks=C.DEFAULT_FORKS, # parallelism level 进程的数目 timeout=C.DEFAULT_TIMEOUT, # SSH timeout ssh超时时间 pattern=C.DEFAULT_PATTERN, # which hosts? ex: 'all', 'acme.example.org' 关于inventory的匹配 remote_user=C.DEFAULT_REMOTE_USER, # ex: 'username' 远端用户的选择 remote_pass=C.DEFAULT_REMOTE_PASS, # ex: 'password123' or None if using key 远端密码选择 remote_port=None, # if SSH on different ports 远端端口 private_key_file=C.DEFAULT_PRIVATE_KEY_FILE, # if not using keys/passwords 指定key文件链接 background=0, # async poll every X seconds, else 0 for non-async basedir=None, # directory of playbook, if applicable setup_cache=None, # used to share fact data w/ other tasks vars_cache=None, # used to store variables about hosts transport=C.DEFAULT_TRANSPORT, # 'ssh', 'paramiko', 'local' conditional='True', # run only if this fact expression evals to true callbacks=None, # used for output module_vars=None, # a playbooks internals thing play_vars=None, # play_file_vars=None, # role_vars=None, # role_params=None, # default_vars=None, # extra_vars=None, # extra vars specified with he playbook(s) is_playbook=False, # running from playbook or not? inventory=None, # reference to Inventory object subset=None, # subset pattern check=False, # don't make any changes, just try to probe for potential changes diff=False, # whether to show diffs for template files that change environment=None, # environment variables (as dict) to use inside the command complex_args=None, # structured data in addition to module_args, must be a dict error_on_undefined_vars=C.DEFAULT_UNDEFINED_VAR_BEHAVIOR, # ex. False accelerate=False, # use accelerated connection accelerate_ipv6=False, # accelerated connection w/ IPv6 accelerate_port=None, # port to use with accelerated connection vault_pass=None, run_hosts=None, # an optional list of pre-calculated hosts to run on no_log=False, # option to enable/disable logging for a given task run_once=False, # option to enable/disable host bypass loop for a given task become=False, # whether to run privelege escalation or not become_method=C.DEFAULT_BECOME_METHOD, become_user=C.DEFAULT_BECOME_USER, # ex: 'root' become_pass=C.DEFAULT_BECOME_PASS, # ex: 'password123' or None become_exe=C.DEFAULT_BECOME_EXE, # ex: /usr/local/bin/sudo ): # used to lock multiprocess inputs and outputs at various levels self.output_lockfile = OUTPUT_LOCKFILE self.process_lockfile = PROCESS_LOCKFILE if not complex_args: complex_args = {} # storage & defaults self.check = check self.diff = diff self.setup_cache = utils.default(setup_cache, lambda: ansible.cache.FactCache()) self.vars_cache = utils.default(vars_cache, lambda: collections.defaultdict(dict)) self.basedir = utils.default(basedir, lambda: os.getcwd()) self.callbacks = utils.default(callbacks, lambda: DefaultRunnerCallbacks()) self.generated_jid = str(random.randint(0, 999999999999)) self.transport = transport self.inventory = utils.default(inventory, lambda: ansible.inventory.Inventory(host_list)) self.module_vars = utils.default(module_vars, lambda: {}) self.play_vars = utils.default(play_vars, lambda: {}) self.play_file_vars = utils.default(play_file_vars, lambda: {}) self.role_vars = utils.default(role_vars, lambda: {}) self.role_params = utils.default(role_params, lambda: {}) self.default_vars = utils.default(default_vars, lambda: {}) self.extra_vars = utils.default(extra_vars, lambda: {}) self.always_run = None self.connector = connection.Connector(self) self.conditional = conditional self.delegate_to = None self.module_name = module_name self.forks = int(forks) self.pattern = pattern self.module_args = module_args self.timeout = timeout self.remote_user = remote_user self.remote_pass = remote_pass self.remote_port = remote_port self.private_key_file = private_key_file self.background = background self.become = become self.become_method = become_method self.become_user_var = become_user self.become_user = None self.become_pass = become_pass self.become_exe = become_exe self.is_playbook = is_playbook self.environment = environment self.complex_args = complex_args self.error_on_undefined_vars = error_on_undefined_vars self.accelerate = accelerate self.accelerate_port = accelerate_port self.accelerate_ipv6 = accelerate_ipv6 self.callbacks.runner = self self.omit_token = '__omit_place_holder__%s' % sha1(os.urandom(64)).hexdigest() self.vault_pass = vault_pass self.no_log = no_log self.run_once = run_once if self.transport == 'smart': # If the transport is 'smart', check to see if certain conditions # would prevent us from using ssh, and fallback to paramiko. # 'smart' is the default since 1.2.1/1.3 self.transport = "ssh" if sys.platform.startswith('darwin') and self.remote_pass: # due to a current bug in sshpass on OSX, which can trigger # a kernel panic even for non-privileged users, we revert to # paramiko on that OS when a SSH password is specified self.transport = "paramiko" else: # see if SSH can support ControlPersist if not use paramiko cmd = subprocess.Popen(['ssh','-o','ControlPersist'], stdout=subprocess.PIPE, stderr=subprocess.PIPE) (out, err) = cmd.communicate() if "Bad configuration option" in err: self.transport = "paramiko" # save the original transport, in case it gets # changed later via options like accelerate self.original_transport = self.transport # misc housekeeping if subset and self.inventory._subset is None: # don't override subset when passed from playbook self.inventory.subset(subset) # If we get a pre-built list of hosts to run on, from say a playbook, use them. # Also where we will store the hosts to run on once discovered self.run_hosts = run_hosts if self.transport == 'local': self.remote_user = pwd.getpwuid(os.geteuid())[0] if module_path is not None: for i in module_path.split(os.pathsep): utils.plugins.module_finder.add_directory(i) utils.plugins.push_basedir(self.basedir) # ensure we are using unique tmp paths random.seed() # ***************************************************** def _complex_args_hack(self, complex_args, module_args): """ ansible-playbook both allows specifying key=value string arguments and complex arguments however not all modules use our python common module system and cannot access these. An example might be a Bash module. This hack allows users to still pass "args" as a hash of simple scalars to those arguments and is short term. We could technically just feed JSON to the module, but that makes it hard on Bash consumers. The way this is implemented it does mean values in 'args' have LOWER priority than those on the key=value line, allowing args to provide yet another way to have pluggable defaults. """ if complex_args is None: return module_args if not isinstance(complex_args, dict): raise errors.AnsibleError("complex arguments are not a dictionary: %s" % complex_args) for (k,v) in complex_args.iteritems(): if isinstance(v, basestring): module_args = "%s=%s %s" % (k, pipes.quote(v), module_args) return module_args # ***************************************************** def _transfer_str(self, conn, tmp, name, data): ''' transfer string to remote file ''' if type(data) == dict: data = utils.jsonify(data) afd, afile = tempfile.mkstemp() afo = os.fdopen(afd, 'w') try: if not isinstance(data, unicode): #ensure the data is valid UTF-8 data.decode('utf-8') else: data = data.encode('utf-8') afo.write(data) except: raise errors.AnsibleError("failure encoding into utf-8") afo.flush() afo.close() remote = conn.shell.join_path(tmp, name) try: conn.put_file(afile, remote) finally: os.unlink(afile) return remote # ***************************************************** def _compute_environment_string(self, conn, inject=None): ''' what environment variables to use when running the command? ''' enviro = {} if self.environment: enviro = template.template(self.basedir, self.environment, inject, convert_bare=True) enviro = utils.safe_eval(enviro) if type(enviro) != dict: raise errors.AnsibleError("environment must be a dictionary, received %s" % enviro) return conn.shell.env_prefix(**enviro) # ***************************************************** def _compute_delegate(self, password, remote_inject): """ Build a dictionary of all attributes for the delegate host """ delegate = {} # allow delegated host to be templated delegate['inject'] = remote_inject.copy() # set any interpreters interpreters = [] for i in delegate['inject']: if i.startswith("ansible_") and i.endswith("_interpreter"): interpreters.append(i) for i in interpreters: del delegate['inject'][i] port = C.DEFAULT_REMOTE_PORT # get the vars for the delegate by its name try: this_info = delegate['inject']['hostvars'][self.delegate_to] except: # make sure the inject is empty for non-inventory hosts this_info = {} # get the real ssh_address for the delegate # and allow ansible_ssh_host to be templated delegate['ssh_host'] = template.template( self.basedir, this_info.get('ansible_ssh_host', self.delegate_to), this_info, fail_on_undefined=True ) delegate['port'] = this_info.get('ansible_ssh_port', port) delegate['user'] = self._compute_delegate_user(self.delegate_to, delegate['inject']) delegate['pass'] = this_info.get('ansible_ssh_pass', password) delegate['private_key_file'] = this_info.get('ansible_ssh_private_key_file', self.private_key_file) delegate['transport'] = this_info.get('ansible_connection', self.transport) delegate['become_pass'] = this_info.get('ansible_become_pass', this_info.get('ansible_ssh_pass', self.become_pass)) # Last chance to get private_key_file from global variables. # this is useful if delegated host is not defined in the inventory if delegate['private_key_file'] is None: delegate['private_key_file'] = remote_inject.get('ansible_ssh_private_key_file', None) if delegate['private_key_file'] is not None: delegate['private_key_file'] = os.path.expanduser(delegate['private_key_file']) for i in this_info: if i.startswith("ansible_") and i.endswith("_interpreter"): delegate['inject'][i] = this_info[i] return delegate def _compute_delegate_user(self, host, inject): """ Calculate the remote user based on an order of preference """ # inventory > playbook > original_host actual_user = inject.get('ansible_ssh_user', self.remote_user) thisuser = None try: if host in inject['hostvars']: if inject['hostvars'][host].get('ansible_ssh_user'): # user for delegate host in inventory thisuser = inject['hostvars'][host].get('ansible_ssh_user') else: # look up the variables for the host directly from inventory host_vars = self.inventory.get_variables(host, vault_password=self.vault_pass) if 'ansible_ssh_user' in host_vars: thisuser = host_vars['ansible_ssh_user'] except errors.AnsibleError, e: # the hostname was not found in the inventory, so # we just ignore this and try the next method pass if thisuser is None and self.remote_user: # user defined by play/runner thisuser = self.remote_user if thisuser is not None: actual_user = thisuser else: # fallback to the inventory user of the play host #actual_user = inject.get('ansible_ssh_user', actual_user) actual_user = inject.get('ansible_ssh_user', self.remote_user) return actual_user def _count_module_args(self, args, allow_dupes=False): ''' Count the number of k=v pairs in the supplied module args. This is basically a specialized version of parse_kv() from utils with a few minor changes. ''' options = {} if args is not None: try: vargs = split_args(args) except Exception, e: if "unbalanced jinja2 block or quotes" in str(e): raise errors.AnsibleError("error parsing argument string '%s', try quoting the entire line." % args) else: raise for x in vargs: quoted = x.startswith('"') and x.endswith('"') or x.startswith("'") and x.endswith("'") if "=" in x and not quoted: k, v = x.split("=",1) is_shell_module = self.module_name in ('command', 'shell') is_shell_param = k in ('creates', 'removes', 'chdir', 'executable') if k in options and not allow_dupes: if not(is_shell_module and not is_shell_param): raise errors.AnsibleError("a duplicate parameter was found in the argument string (%s)" % k) if is_shell_module and is_shell_param or not is_shell_module: options[k] = v return len(options) # ***************************************************** def _execute_module(self, conn, tmp, module_name, args, async_jid=None, async_module=None, async_limit=None, inject=None, persist_files=False, complex_args=None, delete_remote_tmp=True): ''' transfer and run a module along with its arguments on the remote side''' # hack to support fireball mode if module_name == 'fireball': args = "%s password=%s" % (args, base64.b64encode(str(utils.key_for_hostname(conn.host)))) if 'port' not in args: args += " port=%s" % C.ZEROMQ_PORT ( module_style, shebang, module_data ) = self._configure_module(conn, module_name, args, inject, complex_args) # a remote tmp path may be necessary and not already created if self._late_needs_tmp_path(conn, tmp, module_style): tmp = self._make_tmp_path(conn) remote_module_path = conn.shell.join_path(tmp, module_name) if (module_style != 'new' or async_jid is not None or not conn.has_pipelining or not C.ANSIBLE_SSH_PIPELINING or C.DEFAULT_KEEP_REMOTE_FILES or self.become_method == 'su'): self._transfer_str(conn, tmp, module_name, module_data) environment_string = self._compute_environment_string(conn, inject) if "tmp" in tmp and (self.become and self.become_user != 'root'): # deal with possible umask issues once you become another user self._remote_chmod(conn, 'a+r', remote_module_path, tmp) cmd = "" in_data = None if module_style != 'new': if 'CHECKMODE=True' in args: # if module isn't using AnsibleModuleCommon infrastructure we can't be certain it knows how to # do --check mode, so to be safe we will not run it. return ReturnData(conn=conn, result=dict(skipped=True, msg="cannot yet run check mode against old-style modules")) elif 'NO_LOG' in args: return ReturnData(conn=conn, result=dict(skipped=True, msg="cannot use no_log: with old-style modules")) args = template.template(self.basedir, args, inject) # decide whether we need to transfer JSON or key=value argsfile = None if module_style == 'non_native_want_json': if complex_args: complex_args.update(utils.parse_kv(args)) argsfile = self._transfer_str(conn, tmp, 'arguments', utils.jsonify(complex_args)) else: argsfile = self._transfer_str(conn, tmp, 'arguments', utils.jsonify(utils.parse_kv(args))) else: argsfile = self._transfer_str(conn, tmp, 'arguments', args) if self.become and self.become_user != 'root': # deal with possible umask issues once become another user self._remote_chmod(conn, 'a+r', argsfile, tmp) if async_jid is None: cmd = "%s %s" % (remote_module_path, argsfile) else: cmd = " ".join([str(x) for x in [remote_module_path, async_jid, async_limit, async_module, argsfile]]) else: if async_jid is None: if conn.has_pipelining and C.ANSIBLE_SSH_PIPELINING and not C.DEFAULT_KEEP_REMOTE_FILES and not self.become_method == 'su': in_data = module_data else: cmd = "%s" % (remote_module_path) else: cmd = " ".join([str(x) for x in [remote_module_path, async_jid, async_limit, async_module]]) if not shebang: raise errors.AnsibleError("module is missing interpreter line") rm_tmp = None if "tmp" in tmp and not C.DEFAULT_KEEP_REMOTE_FILES and not persist_files and delete_remote_tmp: if not self.become or self.become_user == 'root': # not sudoing or sudoing to root, so can cleanup files in the same step rm_tmp = tmp cmd = conn.shell.build_module_command(environment_string, shebang, cmd, rm_tmp) cmd = cmd.strip() sudoable = True if module_name == "accelerate": # always run the accelerate module as the user # specified in the play, not the become_user sudoable = False res = self._low_level_exec_command(conn, cmd, tmp, become=self.become, sudoable=sudoable, in_data=in_data) if "tmp" in tmp and not C.DEFAULT_KEEP_REMOTE_FILES and not persist_files and delete_remote_tmp: if self.become and self.become_user != 'root': # not becoming root, so maybe can't delete files as that other user # have to clean up temp files as original user in a second step cmd2 = conn.shell.remove(tmp, recurse=True) self._low_level_exec_command(conn, cmd2, tmp, sudoable=False) data = utils.parse_json(res['stdout'], from_remote=True, no_exceptions=True) if 'parsed' in data and data['parsed'] == False: data['msg'] += res['stderr'] return ReturnData(conn=conn, result=data) # ***************************************************** def _executor(self, host, new_stdin): ''' handler for multiprocessing library ''' try: fileno = sys.stdin.fileno() except ValueError: fileno = None try: self._new_stdin = new_stdin if not new_stdin and fileno is not None: try: self._new_stdin = os.fdopen(os.dup(fileno)) except OSError, e: # couldn't dupe stdin, most likely because it's # not a valid file descriptor, so we just rely on # using the one that was passed in pass exec_rc = self._executor_internal(host, new_stdin) if type(exec_rc) != ReturnData: raise Exception("unexpected return type: %s" % type(exec_rc)) # redundant, right? if not exec_rc.comm_ok: self.callbacks.on_unreachable(host, exec_rc.result) return exec_rc except errors.AnsibleError, ae: msg = str(ae) self.callbacks.on_unreachable(host, msg) return ReturnData(host=host, comm_ok=False, result=dict(failed=True, msg=msg)) except Exception: msg = traceback.format_exc() self.callbacks.on_unreachable(host, msg) return ReturnData(host=host, comm_ok=False, result=dict(failed=True, msg=msg)) # ***************************************************** def get_combined_cache(self): # merge the VARS and SETUP caches for this host combined_cache = self.setup_cache.copy() return utils.merge_hash(combined_cache, self.vars_cache) def get_inject_vars(self, host): host_variables = self.inventory.get_variables(host, vault_password=self.vault_pass) combined_cache = self.get_combined_cache() # use combined_cache and host_variables to template the module_vars # we update the inject variables with the data we're about to template # since some of the variables we'll be replacing may be contained there too module_vars_inject = utils.combine_vars(host_variables, combined_cache.get(host, {})) module_vars_inject = utils.combine_vars(self.module_vars, module_vars_inject) module_vars = template.template(self.basedir, self.module_vars, module_vars_inject) # remove bad variables from the module vars, which may be in there due # the way role declarations are specified in playbooks if 'tags' in module_vars: del module_vars['tags'] if 'when' in module_vars: del module_vars['when'] # start building the dictionary of injected variables inject = {} # default vars are the lowest priority inject = utils.combine_vars(inject, self.default_vars) # next come inventory variables for the host inject = utils.combine_vars(inject, host_variables) # then the setup_cache which contains facts gathered inject = utils.combine_vars(inject, self.setup_cache.get(host, {})) # next come variables from vars and vars files inject = utils.combine_vars(inject, self.play_vars) inject = utils.combine_vars(inject, self.play_file_vars) # next come variables from role vars/main.yml files inject = utils.combine_vars(inject, self.role_vars) # then come the module variables inject = utils.combine_vars(inject, module_vars) # followed by vars_cache things (set_fact, include_vars, and # vars_files which had host-specific templating done) inject = utils.combine_vars(inject, self.vars_cache.get(host, {})) # role parameters next inject = utils.combine_vars(inject, self.role_params) # and finally -e vars are the highest priority inject = utils.combine_vars(inject, self.extra_vars) # and then special vars inject.setdefault('ansible_ssh_user', self.remote_user) inject['group_names'] = host_variables.get('group_names', []) inject['groups'] = self.inventory.groups_list() inject['vars'] = self.module_vars inject['defaults'] = self.default_vars inject['environment'] = self.environment inject['playbook_dir'] = os.path.abspath(self.basedir) inject['omit'] = self.omit_token inject['combined_cache'] = combined_cache return inject def _executor_internal(self, host, new_stdin): ''' executes any module one or more times ''' # We build the proper injected dictionary for all future # templating operations in this run inject = self.get_inject_vars(host) # Then we selectively merge some variable dictionaries down to a # single dictionary, used to template the HostVars for this host temp_vars = self.inventory.get_variables(host, vault_password=self.vault_pass) temp_vars = utils.merge_hash(temp_vars, inject['combined_cache']) temp_vars = utils.merge_hash(temp_vars, self.play_vars) temp_vars = utils.merge_hash(temp_vars, self.play_file_vars) temp_vars = utils.merge_hash(temp_vars, self.extra_vars) temp_vars = utils.merge_hash(temp_vars, {'groups': inject['groups']}) hostvars = HostVars(temp_vars, self.inventory, vault_password=self.vault_pass) # and we save the HostVars in the injected dictionary so they # may be referenced from playbooks/templates inject['hostvars'] = hostvars host_connection = inject.get('ansible_connection', self.transport) if host_connection in [ 'paramiko', 'ssh', 'accelerate' ]: port = hostvars.get('ansible_ssh_port', self.remote_port) if port is None: port = C.DEFAULT_REMOTE_PORT else: # fireball, local, etc port = self.remote_port if self.inventory.basedir() is not None: inject['inventory_dir'] = self.inventory.basedir() if self.inventory.src() is not None: inject['inventory_file'] = self.inventory.src() # could be already set by playbook code inject.setdefault('ansible_version', utils.version_info(gitinfo=False)) # allow with_foo to work in playbooks... items = None items_plugin = self.module_vars.get('items_lookup_plugin', None) if items_plugin is not None and items_plugin in utils.plugins.lookup_loader: basedir = self.basedir if '_original_file' in inject: basedir = os.path.dirname(inject['_original_file']) filesdir = os.path.join(basedir, '..', 'files') if os.path.exists(filesdir): basedir = filesdir try: items_terms = self.module_vars.get('items_lookup_terms', '') items_terms = template.template(basedir, items_terms, inject) items = utils.plugins.lookup_loader.get(items_plugin, runner=self, basedir=basedir).run(items_terms, inject=inject) except errors.AnsibleUndefinedVariable, e: if 'has no attribute' in str(e): # the undefined variable was an attribute of a variable that does # exist, so try and run this through the conditional check to see # if the user wanted to skip something on being undefined if utils.check_conditional(self.conditional, self.basedir, inject, fail_on_undefined=True): # the conditional check passed, so we have to fail here raise else: # the conditional failed, so we skip this task result = utils.jsonify(dict(changed=False, skipped=True)) self.callbacks.on_skipped(host, None) return ReturnData(host=host, result=result) except errors.AnsibleError, e: raise except Exception, e: raise errors.AnsibleError("Unexpected error while executing task: %s" % str(e)) # strip out any jinja2 template syntax within # the data returned by the lookup plugin items = utils._clean_data_struct(items, from_remote=True) if items is None: items = [] else: if type(items) != list: raise errors.AnsibleError("lookup plugins have to return a list: %r" % items) if len(items) and utils.is_list_of_strings(items) and self.module_name in [ 'apt', 'yum', 'pkgng', 'zypper' ]: # hack for apt, yum, and pkgng so that with_items maps back into a single module call use_these_items = [] for x in items: inject['item'] = x if not self.conditional or utils.check_conditional(self.conditional, self.basedir, inject, fail_on_undefined=self.error_on_undefined_vars): use_these_items.append(x) inject['item'] = ",".join(use_these_items) items = None def _safe_template_complex_args(args, inject): # Ensure the complex args here are a dictionary, but # first template them if they contain a variable returned_args = args if isinstance(args, basestring): # If the complex_args were evaluated to a dictionary and there are # more keys in the templated version than the evaled version, some # param inserted additional keys (the template() call also runs # safe_eval on the var if it looks like it's a datastructure). If the # evaled_args are not a dict, it's most likely a whole variable (ie. # args: {{var}}), in which case there's no way to detect the proper # count of params in the dictionary. templated_args = template.template(self.basedir, args, inject, convert_bare=True) evaled_args = utils.safe_eval(args) if isinstance(evaled_args, dict) and len(evaled_args) > 0 and len(evaled_args) != len(templated_args): raise errors.AnsibleError("a variable tried to insert extra parameters into the args for this task") # set the returned_args to the templated_args returned_args = templated_args # and a final check to make sure the complex args are a dict if returned_args is not None and not isinstance(returned_args, dict): raise errors.AnsibleError("args must be a dictionary, received %s" % returned_args) return returned_args # logic to decide how to run things depends on whether with_items is used if items is None: complex_args = _safe_template_complex_args(self.complex_args, inject) return self._executor_internal_inner(host, self.module_name, self.module_args, inject, port, complex_args=complex_args) elif len(items) > 0: # executing using with_items, so make multiple calls # TODO: refactor if self.background > 0: raise errors.AnsibleError("lookup plugins (with_*) cannot be used with async tasks") all_comm_ok = True all_changed = False all_failed = False results = [] for x in items: # use a fresh inject for each item this_inject = inject.copy() this_inject['item'] = x complex_args = _safe_template_complex_args(self.complex_args, this_inject) result = self._executor_internal_inner( host, self.module_name, self.module_args, this_inject, port, complex_args=complex_args ) if 'stdout' in result.result and 'stdout_lines' not in result.result: result.result['stdout_lines'] = result.result['stdout'].splitlines() results.append(result.result) if result.comm_ok == False: all_comm_ok = False all_failed = True break for x in results: if x.get('changed') == True: all_changed = True if (x.get('failed') == True) or ('failed_when_result' in x and [x['failed_when_result']] or [('rc' in x) and (x['rc'] != 0)])[0]: all_failed = True break msg = 'All items completed' if all_failed: msg = "One or more items failed." rd_result = dict(failed=all_failed, changed=all_changed, results=results, msg=msg) if not all_failed: del rd_result['failed'] return ReturnData(host=host, comm_ok=all_comm_ok, result=rd_result) else: self.callbacks.on_skipped(host, None) return ReturnData(host=host, comm_ok=True, result=dict(changed=False, skipped=True)) # ***************************************************** def _executor_internal_inner(self, host, module_name, module_args, inject, port, is_chained=False, complex_args=None): ''' decides how to invoke a module ''' # late processing of parameterized become_user (with_items,..) if self.become_user_var is not None: self.become_user = template.template(self.basedir, self.become_user_var, inject) # module_name may be dynamic (but cannot contain {{ ansible_ssh_user }}) module_name = template.template(self.basedir, module_name, inject) if module_name in utils.plugins.action_loader: if self.background != 0: raise errors.AnsibleError("async mode is not supported with the %s module" % module_name) handler = utils.plugins.action_loader.get(module_name, self) elif self.background == 0: handler = utils.plugins.action_loader.get('normal', self) else: handler = utils.plugins.action_loader.get('async', self) if type(self.conditional) != list: self.conditional = [ self.conditional ] for cond in self.conditional: if not utils.check_conditional(cond, self.basedir, inject, fail_on_undefined=self.error_on_undefined_vars): result = dict(changed=False, skipped=True) if self.no_log: result = utils.censor_unlogged_data(result) self.callbacks.on_skipped(host, result) else: self.callbacks.on_skipped(host, inject.get('item',None)) return ReturnData(host=host, result=utils.jsonify(result)) if getattr(handler, 'setup', None) is not None: handler.setup(module_name, inject) conn = None actual_host = inject.get('ansible_ssh_host', host) # allow ansible_ssh_host to be templated actual_host = template.template(self.basedir, actual_host, inject, fail_on_undefined=True) actual_port = port actual_user = inject.get('ansible_ssh_user', self.remote_user) actual_pass = inject.get('ansible_ssh_pass', self.remote_pass) actual_transport = inject.get('ansible_connection', self.transport) actual_private_key_file = inject.get('ansible_ssh_private_key_file', self.private_key_file) actual_private_key_file = template.template(self.basedir, actual_private_key_file, inject, fail_on_undefined=True) self.become = utils.boolean(inject.get('ansible_become', inject.get('ansible_sudo', inject.get('ansible_su', self.become)))) self.become_user = inject.get('ansible_become_user', inject.get('ansible_sudo_user', inject.get('ansible_su_user',self.become_user))) self.become_pass = inject.get('ansible_become_pass', inject.get('ansible_sudo_pass', inject.get('ansible_su_pass', self.become_pass))) self.become_exe = inject.get('ansible_become_exe', inject.get('ansible_sudo_exe', self.become_exe)) # select default root user in case self.become requested # but no user specified; happens e.g. in host vars when # just ansible_become=True is specified if self.become and self.become_user is None: self.become_user = 'root' if actual_private_key_file is not None: actual_private_key_file = os.path.expanduser(actual_private_key_file) if self.accelerate and actual_transport != 'local': #Fix to get the inventory name of the host to accelerate plugin if inject.get('ansible_ssh_host', None): self.accelerate_inventory_host = host else: self.accelerate_inventory_host = None # if we're using accelerated mode, force the # transport to accelerate actual_transport = "accelerate" if not self.accelerate_port: self.accelerate_port = C.ACCELERATE_PORT actual_port = inject.get('ansible_ssh_port', port) # the delegated host may have different SSH port configured, etc # and we need to transfer those, and only those, variables self.delegate_to = inject.get('delegate_to', None) if self.delegate_to: self.delegate_to = template.template(self.basedir, self.delegate_to, inject) if self.delegate_to is not None: delegate = self._compute_delegate(actual_pass, inject) actual_transport = delegate['transport'] actual_host = delegate['ssh_host'] actual_port = delegate['port'] actual_user = delegate['user'] actual_pass = delegate['pass'] actual_private_key_file = delegate['private_key_file'] self.become_pass = delegate.get('become_pass',delegate.get('sudo_pass')) inject = delegate['inject'] # set resolved delegate_to into inject so modules can call _remote_checksum inject['delegate_to'] = self.delegate_to # user/pass may still contain variables at this stage actual_user = template.template(self.basedir, actual_user, inject) actual_pass = template.template(self.basedir, actual_pass, inject) self.become_pass = template.template(self.basedir, self.become_pass, inject) # make actual_user available as __magic__ ansible_ssh_user variable inject['ansible_ssh_user'] = actual_user try: if actual_transport == 'accelerate': # for accelerate, we stuff both ports into a single # variable so that we don't have to mangle other function # calls just to accommodate this one case actual_port = [actual_port, self.accelerate_port] elif actual_port is not None: actual_port = int(template.template(self.basedir, actual_port, inject)) except ValueError, e: result = dict(failed=True, msg="FAILED: Configured port \"%s\" is not a valid port, expected integer" % actual_port) return ReturnData(host=host, comm_ok=False, result=result) try: if self.delegate_to or host != actual_host: delegate_host = host else: delegate_host = None conn = self.connector.connect(actual_host, actual_port, actual_user, actual_pass, actual_transport, actual_private_key_file, delegate_host) default_shell = getattr(conn, 'default_shell', '') shell_type = inject.get('ansible_shell_type') if not shell_type: if default_shell: shell_type = default_shell else: shell_type = os.path.basename(C.DEFAULT_EXECUTABLE) shell_plugin = utils.plugins.shell_loader.get(shell_type) if shell_plugin is None: shell_plugin = utils.plugins.shell_loader.get('sh') conn.shell = shell_plugin except errors.AnsibleConnectionFailed, e: result = dict(failed=True, msg="FAILED: %s" % str(e)) return ReturnData(host=host, comm_ok=False, result=result) tmp = '' # action plugins may DECLARE via TRANSFERS_FILES = True that they need a remote tmp path working dir if self._early_needs_tmp_path(module_name, handler): tmp = self._make_tmp_path(conn) # allow module args to work as a dictionary # though it is usually a string if isinstance(module_args, dict): module_args = utils.serialize_args(module_args) # render module_args and complex_args templates try: # When templating module_args, we need to be careful to ensure # that no variables inadvertently (or maliciously) add params # to the list of args. We do this by counting the number of k=v # pairs before and after templating. num_args_pre = self._count_module_args(module_args, allow_dupes=True) module_args = template.template(self.basedir, module_args, inject, fail_on_undefined=self.error_on_undefined_vars) num_args_post = self._count_module_args(module_args) if num_args_pre != num_args_post: raise errors.AnsibleError("A variable inserted a new parameter into the module args. " + \ "Be sure to quote variables if they contain equal signs (for example: \"{{var}}\").") # And we also make sure nothing added in special flags for things # like the command/shell module (ie. #USE_SHELL) if '#USE_SHELL' in module_args: raise errors.AnsibleError("A variable tried to add #USE_SHELL to the module arguments.") complex_args = template.template(self.basedir, complex_args, inject, fail_on_undefined=self.error_on_undefined_vars) except jinja2.exceptions.UndefinedError, e: raise errors.AnsibleUndefinedVariable("One or more undefined variables: %s" % str(e)) # filter omitted arguments out from complex_args if complex_args: complex_args = dict(filter(lambda x: x[1] != self.omit_token, complex_args.iteritems())) # Filter omitted arguments out from module_args. # We do this with split_args instead of parse_kv to ensure # that things are not unquoted/requoted incorrectly args = split_args(module_args) final_args = [] for arg in args: if '=' in arg: k,v = arg.split('=', 1) if unquote(v) != self.omit_token: final_args.append(arg) else: # not a k=v param, append it final_args.append(arg) module_args = ' '.join(final_args) result = handler.run(conn, tmp, module_name, module_args, inject, complex_args) # Code for do until feature until = self.module_vars.get('until', None) if until is not None and result.comm_ok: inject[self.module_vars.get('register')] = result.result cond = template.template(self.basedir, until, inject, expand_lists=False) if not utils.check_conditional(cond, self.basedir, inject, fail_on_undefined=self.error_on_undefined_vars): retries = template.template(self.basedir, self.module_vars.get('retries'), inject, expand_lists=False) delay = self.module_vars.get('delay') for x in range(1, int(retries) + 1): # template the delay, cast to float and sleep delay = template.template(self.basedir, delay, inject, expand_lists=False) delay = float(delay) time.sleep(delay) tmp = '' if self._early_needs_tmp_path(module_name, handler): tmp = self._make_tmp_path(conn) result = handler.run(conn, tmp, module_name, module_args, inject, complex_args) result.result['attempts'] = x vv("Result from run %i is: %s" % (x, result.result)) inject[self.module_vars.get('register')] = result.result cond = template.template(self.basedir, until, inject, expand_lists=False) if utils.check_conditional(cond, self.basedir, inject, fail_on_undefined=self.error_on_undefined_vars): break if result.result['attempts'] == retries and not utils.check_conditional(cond, self.basedir, inject, fail_on_undefined=self.error_on_undefined_vars): result.result['failed'] = True result.result['msg'] = "Task failed as maximum retries was encountered" else: result.result['attempts'] = 0 conn.close() if not result.comm_ok: # connection or parsing errors... self.callbacks.on_unreachable(host, result.result) else: data = result.result # https://github.com/ansible/ansible/issues/4958 if hasattr(sys.stdout, "isatty"): if "stdout" in data and sys.stdout.isatty(): if not string_functions.isprintable(data['stdout']): data['stdout'] = '' if 'item' in inject: result.result['item'] = inject['item'] result.result['invocation'] = dict( module_args=module_args, module_name=module_name ) changed_when = self.module_vars.get('changed_when') failed_when = self.module_vars.get('failed_when') if (changed_when is not None or failed_when is not None) and self.background == 0: register = self.module_vars.get('register') if register is not None: if 'stdout' in data: data['stdout_lines'] = data['stdout'].splitlines() inject[register] = data # only run the final checks if the async_status has finished, # or if we're not running an async_status check at all if (module_name == 'async_status' and "finished" in data) or module_name != 'async_status': if changed_when is not None and 'skipped' not in data: data['changed'] = utils.check_conditional(changed_when, self.basedir, inject, fail_on_undefined=self.error_on_undefined_vars) if failed_when is not None and 'skipped' not in data: data['failed_when_result'] = data['failed'] = utils.check_conditional(failed_when, self.basedir, inject, fail_on_undefined=self.error_on_undefined_vars) if is_chained: # no callbacks return result if 'skipped' in data: self.callbacks.on_skipped(host, inject.get('item',None)) if self.no_log: data = utils.censor_unlogged_data(data) if not result.is_successful(): ignore_errors = self.module_vars.get('ignore_errors', False) self.callbacks.on_failed(host, data, ignore_errors) else: if self.diff: self.callbacks.on_file_diff(conn.host, result.diff) self.callbacks.on_ok(host, data) return result def _early_needs_tmp_path(self, module_name, handler): ''' detect if a tmp path should be created before the handler is called ''' if module_name in utils.plugins.action_loader: return getattr(handler, 'TRANSFERS_FILES', False) # other modules never need tmp path at early stage return False def _late_needs_tmp_path(self, conn, tmp, module_style): if "tmp" in tmp: # tmp has already been created return False if not conn.has_pipelining or not C.ANSIBLE_SSH_PIPELINING or C.DEFAULT_KEEP_REMOTE_FILES or self.become_method == 'su': # tmp is necessary to store module source code return True if not conn.has_pipelining: # tmp is necessary to store the module source code # or we want to keep the files on the target system return True if module_style != "new": # even when conn has pipelining, old style modules need tmp to store arguments return True return False # ***************************************************** def _low_level_exec_command(self, conn, cmd, tmp, sudoable=False, executable=None, become=False, in_data=None): ''' execute a command string over SSH, return the output ''' # this can be skipped with powershell modules when there is no analog to a Windows command (like chmod) if cmd: if executable is None: executable = C.DEFAULT_EXECUTABLE become_user = self.become_user # compare connection user to (su|sudo)_user and disable if the same # assume connection type is local if no user attribute this_user = getattr(conn, 'user', getpass.getuser()) if (not become and this_user == become_user): sudoable = False become = False rc, stdin, stdout, stderr = conn.exec_command(cmd, tmp, become_user=become_user, sudoable=sudoable, executable=executable, in_data=in_data) if type(stdout) not in [ str, unicode ]: out = ''.join(stdout.readlines()) else: out = stdout if type(stderr) not in [ str, unicode ]: err = ''.join(stderr.readlines()) else: err = stderr if rc is not None: return dict(rc=rc, stdout=out, stderr=err) else: return dict(stdout=out, stderr=err) return dict(rc=None, stdout='', stderr='') # ***************************************************** def _remote_chmod(self, conn, mode, path, tmp, sudoable=False, become=False): ''' issue a remote chmod command ''' cmd = conn.shell.chmod(mode, path) return self._low_level_exec_command(conn, cmd, tmp, sudoable=sudoable, become=become) # ***************************************************** def _remote_expand_user(self, conn, path, tmp): ''' takes a remote path and performs tilde expansion on the remote host ''' if not path.startswith('~'): return path split_path = path.split(os.path.sep, 1) expand_path = split_path[0] if expand_path == '~': if self.become and self.become_user: expand_path = '~%s' % self.become_user cmd = conn.shell.expand_user(expand_path) data = self._low_level_exec_command(conn, cmd, tmp, sudoable=False, become=False) initial_fragment = utils.last_non_blank_line(data['stdout']) if not initial_fragment: # Something went wrong trying to expand the path remotely. Return # the original string return path if len(split_path) > 1: return conn.shell.join_path(initial_fragment, *split_path[1:]) else: return initial_fragment # ***************************************************** def _remote_checksum(self, conn, tmp, path, inject): ''' takes a remote checksum and returns 1 if no file ''' # Lookup the python interp from the host or delegate # host == inven_host when there is no delegate host = inject['inventory_hostname'] if 'delegate_to' in inject: delegate = inject['delegate_to'] if delegate: # host == None when the delegate is not in inventory host = None # delegate set, check whether the delegate has inventory vars delegate = template.template(self.basedir, delegate, inject) if delegate in inject['hostvars']: # host == delegate if we need to lookup the # python_interpreter from the delegate's inventory vars host = delegate if host: python_interp = inject['hostvars'][host].get('ansible_python_interpreter', 'python') else: python_interp = 'python' cmd = conn.shell.checksum(path, python_interp) data = self._low_level_exec_command(conn, cmd, tmp, sudoable=True) data2 = utils.last_non_blank_line(data['stdout']) try: if data2 == '': # this may happen if the connection to the remote server # failed, so just return "INVALIDCHECKSUM" to avoid errors return "INVALIDCHECKSUM" else: return data2.split()[0] except IndexError: sys.stderr.write("warning: Calculating checksum failed unusually, please report this to the list so it can be fixed\n") sys.stderr.write("command: %s\n" % cmd) sys.stderr.write("----\n") sys.stderr.write("output: %s\n" % data) sys.stderr.write("----\n") # this will signal that it changed and allow things to keep going return "INVALIDCHECKSUM" # ***************************************************** def _make_tmp_path(self, conn): ''' make and return a temporary path on a remote box ''' basefile = 'ansible-tmp-%s-%s' % (time.time(), random.randint(0, 2**48)) use_system_tmp = False if self.become and self.become_user != 'root': use_system_tmp = True tmp_mode = None if self.remote_user != 'root' or (self.become and self.become_user != 'root'): tmp_mode = 'a+rx' cmd = conn.shell.mkdtemp(basefile, use_system_tmp, tmp_mode) result = self._low_level_exec_command(conn, cmd, None, sudoable=False) # error handling on this seems a little aggressive? if result['rc'] != 0: if result['rc'] == 5: output = 'Authentication failure.' elif result['rc'] == 255 and self.transport in ['ssh']: if utils.VERBOSITY > 3: output = 'SSH encountered an unknown error. The output was:\n%s' % (result['stdout']+result['stderr']) else: output = 'SSH encountered an unknown error during the connection. We recommend you re-run the command using -vvvv, which will enable SSH debugging output to help diagnose the issue' elif 'No space left on device' in result['stderr']: output = result['stderr'] else: output = 'Authentication or permission failure. In some cases, you may have been able to authenticate and did not have permissions on the remote directory. Consider changing the remote temp path in ansible.cfg to a path rooted in "/tmp". Failed command was: %s, exited with result %d' % (cmd, result['rc']) if 'stdout' in result and result['stdout'] != '': output = output + ": %s" % result['stdout'] raise errors.AnsibleError(output) rc = conn.shell.join_path(utils.last_non_blank_line(result['stdout']).strip(), '') # Catch failure conditions, files should never be # written to locations in /. if rc == '/': raise errors.AnsibleError('failed to resolve remote temporary directory from %s: `%s` returned empty string' % (basetmp, cmd)) return rc # ***************************************************** def _remove_tmp_path(self, conn, tmp_path): ''' Remove a tmp_path. ''' if "-tmp-" in tmp_path: cmd = conn.shell.remove(tmp_path, recurse=True) self._low_level_exec_command(conn, cmd, None, sudoable=False) # If we have gotten here we have a working ssh configuration. # If ssh breaks we could leave tmp directories out on the remote system. # ***************************************************** def _copy_module(self, conn, tmp, module_name, module_args, inject, complex_args=None): ''' transfer a module over SFTP, does not run it ''' ( module_style, module_shebang, module_data ) = self._configure_module(conn, module_name, module_args, inject, complex_args) module_remote_path = conn.shell.join_path(tmp, module_name) self._transfer_str(conn, tmp, module_name, module_data) return (module_remote_path, module_style, module_shebang) # ***************************************************** def _configure_module(self, conn, module_name, module_args, inject, complex_args=None): ''' find module and configure it ''' # Search module path(s) for named module. module_suffixes = getattr(conn, 'default_suffixes', None) module_path = utils.plugins.module_finder.find_plugin(module_name, module_suffixes) if module_path is None: module_path2 = utils.plugins.module_finder.find_plugin('ping', module_suffixes) if module_path2 is not None: raise errors.AnsibleFileNotFound("module %s not found in configured module paths" % (module_name)) else: raise errors.AnsibleFileNotFound("module %s not found in configured module paths. Additionally, core modules are missing. If this is a checkout, run 'git submodule update --init --recursive' to correct this problem." % (module_name)) # insert shared code and arguments into the module (module_data, module_style, module_shebang) = module_replacer.modify_module( module_path, complex_args, module_args, inject ) return (module_style, module_shebang, module_data) # ***************************************************** def _parallel_exec(self, hosts): ''' handles mulitprocessing when more than 1 fork is required ''' manager = multiprocessing.Manager() job_queue = manager.Queue() for host in hosts: job_queue.put(host) result_queue = manager.Queue() try: fileno = sys.stdin.fileno() except ValueError: fileno = None workers = [] for i in range(self.forks): new_stdin = None if fileno is not None: try: new_stdin = os.fdopen(os.dup(fileno)) except OSError, e: # couldn't dupe stdin, most likely because it's # not a valid file descriptor, so we just rely on # using the one that was passed in pass prc = multiprocessing.Process(target=_executor_hook, args=(job_queue, result_queue, new_stdin)) prc.start() workers.append(prc) try: for worker in workers: worker.join() except KeyboardInterrupt: for worker in workers: worker.terminate() worker.join() results = [] try: while not result_queue.empty(): results.append(result_queue.get(block=False)) except socket.error: raise errors.AnsibleError("<interrupted>") return results # ***************************************************** def _partition_results(self, results): ''' separate results by ones we contacted & ones we didn't ''' if results is None: return None results2 = dict(contacted={}, dark={}) for result in results: host = result.host if host is None: raise Exception("internal error, host not set") if result.communicated_ok(): results2["contacted"][host] = result.result else: results2["dark"][host] = result.result # hosts which were contacted but never got a chance to return for host in self.run_hosts: if not (host in results2['dark'] or host in results2['contacted']): results2["dark"][host] = {} return results2 # ***************************************************** def run(self): ''' xfer & run module on all matched hosts ''' # find hosts that match the pattern if not self.run_hosts: self.run_hosts = self.inventory.list_hosts(self.pattern) hosts = self.run_hosts if len(hosts) == 0: self.callbacks.on_no_hosts() return dict(contacted={}, dark={}) global multiprocessing_runner multiprocessing_runner = self results = None # Check if this is an action plugin. Some of them are designed # to be ran once per group of hosts. Example module: pause, # run once per hostgroup, rather than pausing once per each # host. p = utils.plugins.action_loader.get(self.module_name, self) if self.forks == 0 or self.forks > len(hosts): self.forks = len(hosts) if (p and (getattr(p, 'BYPASS_HOST_LOOP', None)) or self.run_once): # Expose the current hostgroup to the bypassing plugins self.host_set = hosts # We aren't iterating over all the hosts in this # group. So, just choose the "delegate_to" host if that is defined and is # one of the targeted hosts, otherwise pick the first host in our group to # construct the conn object with. if self.delegate_to is not None and self.delegate_to in hosts: host = self.delegate_to else: host = hosts[0] result_data = self._executor(host, None).result # Create a ResultData item for each host in this group # using the returned result. If we didn't do this we would # get false reports of dark hosts. results = [ ReturnData(host=h, result=result_data, comm_ok=True) \ for h in hosts ] del self.host_set elif self.forks > 1: try: results = self._parallel_exec(hosts) except IOError, ie: print ie.errno if ie.errno == 32: # broken pipe from Ctrl+C raise errors.AnsibleError("interrupted") raise else: results = [ self._executor(h, None) for h in hosts ] return self._partition_results(results) # ***************************************************** def run_async(self, time_limit): ''' Run this module asynchronously and return a poller. ''' self.background = time_limit results = self.run() return results, poller.AsyncPoller(results, self) # ***************************************************** def noop_on_check(self, inject): ''' Should the runner run in check mode or not ? ''' # initialize self.always_run on first call if self.always_run is None: self.always_run = self.module_vars.get('always_run', False) self.always_run = check_conditional( self.always_run, self.basedir, inject, fail_on_undefined=True) return (self.check and not self.always_run)
附录：
pwd模块
。
出处：http://www.cnblogs.com/madsnotes/
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