173 lines
6 KiB
Python
173 lines
6 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 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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# FIXME: common base class with Local?
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import io
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import os
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import sys
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import subprocess
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import logging
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import cdist
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class RemoteScriptError(cdist.Error):
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def __init__(self, script, command, script_content):
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self.script = script
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self.command = command
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self.script_content = script_content
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def __str__(self):
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plain_command = " ".join(self.command)
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return "Remote script execution failed: %s" % plain_command
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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, target_host, remote_base_path, remote_exec, remote_copy):
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self.target_host = target_host
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self.base_path = remote_base_path
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self._exec = remote_exec
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self._copy = remote_copy
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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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def create_directories(self):
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self.rmdir(self.base_path)
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self.mkdir(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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command = self._copy.split()
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command.extend(["-r", source, self.target_host + ":" + destination])
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self._run_command(command)
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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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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)), "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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# can't pass environment to remote side, so prepend command with
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# variable declarations
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if env:
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cmd = ["%s=%s" % item for item in env.items()]
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cmd.extend(command)
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else:
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cmd = command
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self.log.debug("Remote run: %s", command)
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try:
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if return_output:
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return subprocess.check_output(command, env=os_environ).decode()
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else:
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subprocess.check_call(command, env=os_environ)
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except subprocess.CalledProcessError:
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raise cdist.Error("Command failed: " + " ".join(command))
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except OSError as error:
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raise cdist.Error(" ".join(*args) + ": " + error.args[1])
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except UnicodeDecodeError:
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raise DecodeError(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 = self._exec.split()
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command.append(self.target_host)
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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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# can't pass environment to remote side, so prepend command with
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# variable declarations
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if env:
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command.extend(["%s=%s" % item for item in env.items()])
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command.extend(["/bin/sh", "-e"])
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command.append(script)
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self.log.debug("Remote run script: %s", command)
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if env:
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self.log.debug("Remote run script env: %s", env)
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try:
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if return_output:
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return subprocess.check_output(command, env=os_environ).decode()
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else:
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subprocess.check_call(command, env=os_environ)
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except subprocess.CalledProcessError as error:
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script_content = self.run(["cat", script], return_output=True)
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self.log.error("Code that raised the error:\n%s", script_content)
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raise RemoteScriptError(script, command, script_content)
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except EnvironmentError as error:
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raise cdist.Error(" ".join(command) + ": " + error.args[1])
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