352 lines
13 KiB
Python
352 lines
13 KiB
Python
# -*- coding: utf-8 -*-
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#
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# 2011-2017 Steven Armstrong (steven-cdist at armstrong.cc)
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# 2011-2013 Nico Schottelius (nico-cdist at schottelius.org)
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#
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# This file is part of cdist.
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#
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# cdist is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# cdist is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with cdist. If not, see <http://www.gnu.org/licenses/>.
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#
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#
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import os
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import glob
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import subprocess
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import logging
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import multiprocessing
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import cdist
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import cdist.exec.util as util
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import cdist.util.ipaddr as ipaddr
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from cdist.mputil import mp_pool_run
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def _wrap_addr(addr):
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"""If addr is IPv6 then return addr wrapped between '[' and ']',
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otherwise return it intact."""
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if ipaddr.is_ipv6(addr):
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return "".join(("[", addr, "]", ))
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else:
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return addr
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class DecodeError(cdist.Error):
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def __init__(self, command):
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self.command = command
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def __str__(self):
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return "Cannot decode output of " + " ".join(self.command)
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class Remote(object):
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"""Execute commands remotely.
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All interaction with the remote side should be done through this class.
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Directly accessing the remote side from python code is a bug.
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"""
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def __init__(self,
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target_host,
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remote_exec,
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remote_copy,
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base_path=None,
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quiet_mode=None,
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archiving_mode=None,
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configuration=None,
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stdout_base_path=None,
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stderr_base_path=None):
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self.target_host = target_host
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self._exec = remote_exec
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self._copy = remote_copy
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if base_path:
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self.base_path = base_path
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else:
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self.base_path = "/var/lib/cdist"
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self.quiet_mode = quiet_mode
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self.archiving_mode = archiving_mode
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if configuration:
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self.configuration = configuration
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else:
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self.configuration = {}
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self.stdout_base_path = stdout_base_path
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self.stderr_base_path = stderr_base_path
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self.conf_path = os.path.join(self.base_path, "conf")
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self.object_path = os.path.join(self.base_path, "object")
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self.type_path = os.path.join(self.conf_path, "type")
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self.global_explorer_path = os.path.join(self.conf_path, "explorer")
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self._open_logger()
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self._init_env()
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def _open_logger(self):
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self.log = logging.getLogger(self.target_host[0])
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# logger is not pickable, so remove it when we pickle
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def __getstate__(self):
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state = self.__dict__.copy()
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if 'log' in state:
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del state['log']
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return state
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# recreate logger when we unpickle
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def __setstate__(self, state):
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self.__dict__.update(state)
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self._open_logger()
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def _init_env(self):
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"""Setup environment for scripts."""
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# FIXME: better do so in exec functions that require it!
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os.environ['__remote_copy'] = self._copy
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os.environ['__remote_exec'] = self._exec
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def create_files_dirs(self):
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self.rmdir(self.base_path)
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self.mkdir(self.base_path)
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self.run(["chmod", "0700", self.base_path])
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self.mkdir(self.conf_path)
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def remove_files_dirs(self):
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self.rmdir(self.base_path)
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def rmfile(self, path):
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"""Remove file on the remote side."""
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self.log.trace("Remote rm: %s", path)
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self.run(["rm", "-f", path])
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def rmdir(self, path):
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"""Remove directory on the remote side."""
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self.log.trace("Remote rmdir: %s", path)
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self.run(["rm", "-rf", path])
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def mkdir(self, path):
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"""Create directory on the remote side."""
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self.log.trace("Remote mkdir: %s", path)
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self.run(["mkdir", "-p", path])
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def extract_archive(self, path, mode):
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"""Extract archive path on the remote side."""
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import cdist.autil as autil
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self.log.trace("Remote extract archive: %s", path)
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command = ["tar", "-x", "-m", "-C", ]
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directory = os.path.dirname(path)
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command.append(directory)
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xopt = autil.get_extract_option(mode)
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if xopt:
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command.append(xopt)
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command.append("-f")
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command.append(path)
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self.run(command)
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def _transfer_file(self, source, destination):
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command = self._copy.split()
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command.extend([source, '{0}:{1}'.format(
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_wrap_addr(self.target_host[0]), destination)])
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self._run_command(command)
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def transfer(self, source, destination, jobs=None):
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"""Transfer a file or directory to the remote side."""
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self.log.trace("Remote transfer: %s -> %s", source, destination)
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# self.rmdir(destination)
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if os.path.isdir(source):
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self.mkdir(destination)
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used_archiving = False
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if self.archiving_mode:
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self.log.trace("Remote transfer in archiving mode")
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import cdist.autil as autil
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# create archive
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tarpath, fcnt = autil.tar(source, self.archiving_mode)
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if tarpath is None:
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self.log.trace(("Files count {} is lower than {} limit, "
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"skipping archiving").format(
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fcnt, autil.FILES_LIMIT))
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else:
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self.log.trace(("Archiving mode, tarpath: %s, file count: "
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"%s"), tarpath, fcnt)
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# get archive name
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tarname = os.path.basename(tarpath)
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self.log.trace("Archiving mode tarname: %s", tarname)
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# archive path at the remote
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desttarpath = os.path.join(destination, tarname)
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self.log.trace(
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"Archiving mode desttarpath: %s", desttarpath)
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# transfer archive to the remote side
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self.log.trace("Archiving mode: transfering")
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self._transfer_file(tarpath, desttarpath)
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# extract archive at the remote
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self.log.trace("Archiving mode: extracting")
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self.extract_archive(desttarpath, self.archiving_mode)
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# remove remote archive
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self.log.trace("Archiving mode: removing remote archive")
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self.rmfile(desttarpath)
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# remove local archive
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self.log.trace("Archiving mode: removing local archive")
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os.remove(tarpath)
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used_archiving = True
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if not used_archiving:
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if jobs:
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self._transfer_dir_parallel(source, destination, jobs)
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else:
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self._transfer_dir_sequential(source, destination)
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elif jobs:
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raise cdist.Error("Source {} is not a directory".format(source))
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else:
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self._transfer_file(source, destination)
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def _transfer_dir_commands(self, source, destination):
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for f in glob.glob1(source, '*'):
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command = self._copy.split()
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path = os.path.join(source, f)
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command.extend([path, '{0}:{1}'.format(
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_wrap_addr(self.target_host[0]), destination)])
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yield command
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def _transfer_dir_sequential(self, source, destination):
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for command in self._transfer_dir_commands(source, destination):
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self._run_command(command)
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def _transfer_dir_parallel(self, source, destination, jobs):
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"""Transfer a directory to the remote side in parallel mode."""
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self.log.debug("Remote transfer in {} parallel jobs".format(
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jobs))
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self.log.trace("Multiprocessing start method is {}".format(
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multiprocessing.get_start_method()))
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self.log.trace(("Starting multiprocessing Pool for parallel "
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"remote transfer"))
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args = [
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(command, )
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for command in self._transfer_dir_commands(source, destination)
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]
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if len(args) == 1:
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self.log.debug("Only one dir entry, transfering sequentially")
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self._run_command(args[0])
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else:
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mp_pool_run(self._run_command, args, jobs=jobs)
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self.log.trace(("Multiprocessing for parallel transfer "
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"finished"))
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def run_script(self, script, env=None, return_output=False, stdout=None,
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stderr=None):
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"""Run the given script with the given environment on the remote side.
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Return the output as a string.
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"""
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command = [
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self.configuration.get('remote_shell', "/bin/sh"),
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"-e"
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]
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command.append(script)
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return self.run(command, env=env, return_output=return_output,
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stdout=stdout, stderr=stderr)
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def run(self, command, env=None, return_output=False, stdout=None,
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stderr=None):
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"""Run the given command with the given environment on the remote side.
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Return the output as a string.
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"""
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# prefix given command with remote_exec
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cmd = self._exec.split()
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cmd.append(self.target_host[0])
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# can't pass environment to remote side, so prepend command with
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# variable declarations
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# cdist command prepended with variable assignments expects
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# posix shell (bourne, bash) at the remote as user default shell.
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# If remote user shell isn't poxis shell, but for e.g. csh/tcsh
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# then these var assignments are not var assignments for this
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# remote shell, it tries to execute it as a command and fails.
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# So really do this by default:
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# /bin/sh -c 'export <var assignments>; command'
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# so that constructed remote command isn't dependent on remote
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# shell. Do this only if env is not None. env breaks this.
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# Explicitly use /bin/sh, because var assignments assume poxis
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# shell already.
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# This leaves the posibility to write script that needs to be run
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# remotely in e.g. csh and setting up CDIST_REMOTE_SHELL to e.g.
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# /bin/csh will execute this script in the right way.
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if env:
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remote_env = [" export %s=%s;" % item for item in env.items()]
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string_cmd = ("/bin/sh -c '" + " ".join(remote_env) +
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" ".join(command) + "'")
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cmd.append(string_cmd)
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else:
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cmd.extend(command)
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return self._run_command(cmd, env=env, return_output=return_output,
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stdout=stdout, stderr=stderr)
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def _run_command(self, command, env=None, return_output=False, stdout=None,
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stderr=None):
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"""Run the given command with the given environment.
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Return the output as a string.
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"""
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assert isinstance(command, (list, tuple)), (
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"list or tuple argument expected, got: %s" % command)
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if return_output and stdout is not subprocess.PIPE:
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self.log.debug("return_output is True, ignoring stdout")
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close_stdout = False
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close_stderr = False
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if not return_output and stdout is None:
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stdout = util.get_std_fd(self.stdout_base_path, 'remote')
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close_stdout = True
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if stderr is None:
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stderr = util.get_std_fd(self.stderr_base_path, 'remote')
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close_stderr = True
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# export target_host, target_hostname, target_fqdn
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# for use in __remote_{exec,copy} scripts
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os_environ = os.environ.copy()
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os_environ['__target_host'] = self.target_host[0]
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os_environ['__target_hostname'] = self.target_host[1]
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os_environ['__target_fqdn'] = self.target_host[2]
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self.log.trace("Remote run: %s", command)
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try:
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if self.quiet_mode:
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stderr = subprocess.DEVNULL
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if return_output:
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output = subprocess.check_output(command, env=os_environ,
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stderr=stderr).decode()
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else:
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subprocess.check_call(command, env=os_environ, stdout=stdout,
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stderr=stderr)
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output = None
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util.log_std_fd(self.log, command, stderr, 'Remote stderr')
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util.log_std_fd(self.log, command, stdout, 'Remote stdout')
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return output
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except subprocess.CalledProcessError as e:
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util.handle_called_process_error(e, command)
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except OSError as error:
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raise cdist.Error(" ".join(command) + ": " + error.args[1])
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except UnicodeDecodeError:
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raise DecodeError(command)
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finally:
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if close_stdout:
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stdout.close()
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if close_stderr:
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stderr.close()
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