185 lines
6.7 KiB
Python
185 lines
6.7 KiB
Python
# -*- coding: utf-8 -*-
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#
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# 2011 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 io
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import os
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import sys
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import glob
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import subprocess
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import logging
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import cdist.exec.util as exec_util
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import cdist
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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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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.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.log = logging.getLogger(self.target_host)
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self._init_env()
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def _init_env(self):
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"""Setup environment for scripts - HERE????"""
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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 rmdir(self, path):
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"""Remove directory on the remote side."""
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self.log.debug("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.debug("Remote mkdir: %s", path)
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self.run(["mkdir", "-p", path])
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def transfer(self, source, destination):
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"""Transfer a file or directory to the remote side."""
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self.log.debug("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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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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self.target_host, destination)])
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self._run_command(command)
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else:
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command = self._copy.split()
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command.extend([source, '{0}:{1}'.format(
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self.target_host, destination)])
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self._run_command(command)
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def run_script(self, script, env=None, return_output=False):
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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 = [os.environ.get('CDIST_REMOTE_SHELL', "/bin/sh"), "-e"]
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command.append(script)
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return self.run(command, env, return_output)
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def run(self, command, env=None, return_output=False):
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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)
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# FIXME: replace this by -o SendEnv name -o SendEnv name ... to ssh?
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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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def _run_command(self, command, env=None, return_output=False):
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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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# export target_host 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
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self.log.debug("Remote run: %s", command)
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try:
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output, errout = exec_util.call_get_output(command, env=os_environ)
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self.log.debug("Remote stdout: {}".format(output))
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# Currently, stderr is not captured.
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# self.log.debug("Remote stderr: {}".format(errout))
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if return_output:
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return output.decode()
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except subprocess.CalledProcessError as e:
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exec_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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