# -*- 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 io
import os
import sys
import glob
import subprocess
import logging
import cdist.exec.util as exec_util
import cdist
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):
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.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.log = logging.getLogger(self.target_host)
self._init_env()
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 rmdir(self, path):
"""Remove directory on the remote side."""
self.log.debug("Remote rmdir: %s", path)
self.run(["rm", "-rf", path])
def mkdir(self, path):
"""Create directory on the remote side."""
self.log.debug("Remote mkdir: %s", path)
self.run(["mkdir", "-p", path])
def transfer(self, source, destination):
"""Transfer a file or directory to the remote side."""
self.log.debug("Remote transfer: %s -> %s", source, destination)
self.rmdir(destination)
if os.path.isdir(source):
self.mkdir(destination)
for f in glob.glob1(source, '*'):
command = self._copy.split()
path = os.path.join(source, f)
command.extend([path, '{0}:{1}'.format(self.target_host, destination)])
self._run_command(command)
else:
command = self._copy.split()
command.extend([source, '{0}:{1}'.format(self.target_host, destination)])
self._run_command(command)
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 = [ os.environ.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)
# FIXME: replace this by -o SendEnv name -o SendEnv name ... to ssh?
# 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 for use in __remote_{exec,copy} scripts
os_environ = os.environ.copy()
os_environ['__target_host'] = self.target_host
self.log.debug("Remote run: %s", command)
try:
output = exec_util.call_get_output(command, env=os_environ)
self.log.debug("Remote output: {}".format(output))
if return_output:
return output.decode()
except subprocess.CalledProcessError as e:
raise cdist.Error("Command failed: " + " ".join(command)
+ " with returncode: {} and output: {}".format(
e.returncode, e.output))
except OSError as error:
raise cdist.Error(" ".join(command) + ": " + error.args[1])
except UnicodeDecodeError:
raise DecodeError(command)