# -*- coding: utf-8 -*-
#
# 2011 Steven Armstrong (steven-cdist at armstrong.cc)
# 2011-2013 Nico Schottelius (nico-cdist at schottelius.org)
#
# This file is part of cdist.
#
# cdist 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.
#
# cdist 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 cdist. If not, see .
#
#
import os
import glob
import subprocess
import logging
import multiprocessing
import cdist
import cdist.exec.util as exec_util
import cdist.util.ipaddr as ipaddr
from cdist.mputil import mp_pool_run
def _wrap_addr(addr):
"""If addr is IPv6 then return addr wrapped between '[' and ']',
otherwise return it intact."""
if ipaddr.is_ipv6(addr):
return "".join(("[", addr, "]", ))
else:
return addr
class DecodeError(cdist.Error):
def __init__(self, command):
self.command = command
def __str__(self):
return "Cannot decode output of " + " ".join(self.command)
class Remote(object):
"""Execute commands remotely.
All interaction with the remote side should be done through this class.
Directly accessing the remote side from python code is a bug.
"""
def __init__(self,
target_host,
remote_exec,
remote_copy,
base_path=None,
quiet_mode=None,
archiving_mode=None,
configuration=None):
self.target_host = target_host
self._exec = remote_exec
self._copy = remote_copy
if base_path:
self.base_path = base_path
else:
self.base_path = "/var/lib/cdist"
self.quiet_mode = quiet_mode
self.archiving_mode = archiving_mode
if configuration:
self.configuration = configuration
else:
self.configuration = {}
self.conf_path = os.path.join(self.base_path, "conf")
self.object_path = os.path.join(self.base_path, "object")
self.type_path = os.path.join(self.conf_path, "type")
self.global_explorer_path = os.path.join(self.conf_path, "explorer")
self._open_logger()
self._init_env()
def _open_logger(self):
self.log = logging.getLogger(self.target_host[0])
# logger is not pickable, so remove it when we pickle
def __getstate__(self):
state = self.__dict__.copy()
if 'log' in state:
del state['log']
return state
# recreate logger when we unpickle
def __setstate__(self, state):
self.__dict__.update(state)
self._open_logger()
def _init_env(self):
"""Setup environment for scripts - HERE????"""
# FIXME: better do so in exec functions that require it!
os.environ['__remote_copy'] = self._copy
os.environ['__remote_exec'] = self._exec
def create_files_dirs(self):
self.rmdir(self.base_path)
self.mkdir(self.base_path)
self.run(["chmod", "0700", self.base_path])
self.mkdir(self.conf_path)
def rmfile(self, path):
"""Remove file on the remote side."""
self.log.trace("Remote rm: %s", path)
self.run(["rm", "-f", path])
def rmdir(self, path):
"""Remove directory on the remote side."""
self.log.trace("Remote rmdir: %s", path)
self.run(["rm", "-rf", path])
def mkdir(self, path):
"""Create directory on the remote side."""
self.log.trace("Remote mkdir: %s", path)
self.run(["mkdir", "-p", path])
def extract_archive(self, path, mode):
"""Extract archive path on the remote side."""
import cdist.autil as autil
self.log.trace("Remote extract archive: %s", path)
command = ["tar", "-x", "-m", "-C", ]
directory = os.path.dirname(path)
command.append(directory)
xopt = autil.get_extract_option(mode)
if xopt:
command.append(xopt)
command.append("-f")
command.append(path)
self.run(command)
def _transfer_file(self, source, destination):
command = self._copy.split()
command.extend([source, '{0}:{1}'.format(
_wrap_addr(self.target_host[0]), destination)])
self._run_command(command)
def transfer(self, source, destination, jobs=None):
"""Transfer a file or directory to the remote side."""
self.log.trace("Remote transfer: %s -> %s", source, destination)
# self.rmdir(destination)
if os.path.isdir(source):
self.mkdir(destination)
used_archiving = False
if self.archiving_mode:
self.log.trace("Remote transfer in archiving mode")
import cdist.autil as autil
# create archive
tarpath, fcnt = autil.tar(source, self.archiving_mode)
if tarpath is None:
self.log.trace(("Files count {} is lower than {} limit, "
"skipping archiving").format(
fcnt, autil.FILES_LIMIT))
else:
self.log.trace(("Archiving mode, tarpath: %s, file count: "
"%s"), tarpath, fcnt)
# get archive name
tarname = os.path.basename(tarpath)
self.log.trace("Archiving mode tarname: %s", tarname)
# archive path at the remote
desttarpath = os.path.join(destination, tarname)
self.log.trace(
"Archiving mode desttarpath: %s", desttarpath)
# transfer archive to the remote side
self.log.trace("Archiving mode: transfering")
self._transfer_file(tarpath, desttarpath)
# extract archive at the remote
self.log.trace("Archiving mode: extracting")
self.extract_archive(desttarpath, self.archiving_mode)
# remove remote archive
self.log.trace("Archiving mode: removing remote archive")
self.rmfile(desttarpath)
# remove local archive
self.log.trace("Archiving mode: removing local archive")
os.remove(tarpath)
used_archiving = True
if not used_archiving:
if jobs:
self._transfer_dir_parallel(source, destination, jobs)
else:
self._transfer_dir_sequential(source, destination)
elif jobs:
raise cdist.Error("Source {} is not a directory".format(source))
else:
self._transfer_file(source, destination)
def _transfer_dir_commands(self, source, destination):
for f in glob.glob1(source, '*'):
command = self._copy.split()
path = os.path.join(source, f)
command.extend([path, '{0}:{1}'.format(
_wrap_addr(self.target_host[0]), destination)])
yield command
def _transfer_dir_sequential(self, source, destination):
for command in self._transfer_dir_commands(source, destination):
self._run_command(command)
def _transfer_dir_parallel(self, source, destination, jobs):
"""Transfer a directory to the remote side in parallel mode."""
self.log.debug("Remote transfer in {} parallel jobs".format(
jobs))
self.log.trace("Multiprocessing start method is {}".format(
multiprocessing.get_start_method()))
self.log.trace(("Starting multiprocessing Pool for parallel "
"remote transfer"))
args = [
(command, )
for command in self._transfer_dir_commands(source, destination)
]
if len(args) == 1:
self.log.debug("Only one dir entry, transfering sequentially")
self._run_command(args[0])
else:
mp_pool_run(self._run_command, args, jobs=jobs)
self.log.trace(("Multiprocessing for parallel transfer "
"finished"))
def run_script(self, script, env=None, return_output=False):
"""Run the given script with the given environment on the remote side.
Return the output as a string.
"""
command = [
self.configuration.get('CDIST_REMOTE_SHELL', "/bin/sh"),
"-e"
]
command.append(script)
return self.run(command, env, return_output)
def run(self, command, env=None, return_output=False):
"""Run the given command with the given environment on the remote side.
Return the output as a string.
"""
# prefix given command with remote_exec
cmd = self._exec.split()
cmd.append(self.target_host[0])
# can't pass environment to remote side, so prepend command with
# variable declarations
# cdist command prepended with variable assignments expects
# posix shell (bourne, bash) at the remote as user default shell.
# If remote user shell isn't poxis shell, but for e.g. csh/tcsh
# then these var assignments are not var assignments for this
# remote shell, it tries to execute it as a command and fails.
# So really do this by default:
# /bin/sh -c 'export ; command'
# so that constructed remote command isn't dependent on remote
# shell. Do this only if env is not None. env breaks this.
# Explicitly use /bin/sh, because var assignments assume poxis
# shell already.
# This leaves the posibility to write script that needs to be run
# remotely in e.g. csh and setting up CDIST_REMOTE_SHELL to e.g.
# /bin/csh will execute this script in the right way.
if env:
remote_env = [" export %s=%s;" % item for item in env.items()]
string_cmd = ("/bin/sh -c '" + " ".join(remote_env) +
" ".join(command) + "'")
cmd.append(string_cmd)
else:
cmd.extend(command)
return self._run_command(cmd, env=env, return_output=return_output)
def _run_command(self, command, env=None, return_output=False):
"""Run the given command with the given environment.
Return the output as a string.
"""
assert isinstance(command, (list, tuple)), (
"list or tuple argument expected, got: %s" % command)
# export target_host, target_hostname, target_fqdn
# for use in __remote_{exec,copy} scripts
os_environ = os.environ.copy()
os_environ['__target_host'] = self.target_host[0]
os_environ['__target_hostname'] = self.target_host[1]
os_environ['__target_fqdn'] = self.target_host[2]
self.log.trace("Remote run: %s", command)
try:
if self.quiet_mode:
stderr = subprocess.DEVNULL
else:
stderr = None
output, errout = exec_util.call_get_output(
command, env=os_environ, stderr=stderr)
self.log.trace("Remote stdout: {}".format(output))
# Currently, stderr is not captured.
# self.log.trace("Remote stderr: {}".format(errout))
if return_output:
return output.decode()
except subprocess.CalledProcessError as e:
exec_util.handle_called_process_error(e, command)
except OSError as error:
raise cdist.Error(" ".join(command) + ": " + error.args[1])
except UnicodeDecodeError:
raise DecodeError(command)