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remote code execution and tests

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Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>
This commit is contained in:
Steven Armstrong 2011-10-12 14:30:10 +02:00
parent d85118c4c1
commit 7da3a3c305
4 changed files with 243 additions and 0 deletions
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lib/cdist/exec/__init__.py Normal file
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lib/cdist/exec/remote.py Normal file
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# -*- coding: utf-8 -*-
#
# 2011 Steven Armstrong (steven-cdist at armstrong.cc)
# 2011 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 <http://www.gnu.org/licenses/>.
#
#
import io
import os
import sys
import subprocess
import logging
import cdist
class RemoteScriptError(cdist.Error):
def __init__(self, script, command, script_content):
self.script = script
self.command = command
self.script_content = script_content
def __str__(self):
return "Remote script execution failed: %s %s" % (self.script, 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_base_path, remote_exec, remote_copy):
self.target_host = target_host
self.base_path = remote_base_path
self._exec = remote_exec
self._copy = remote_copy
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)
def create_directories(self):
self.rmdir(self.base_path)
self.mkdir(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)
command = self._copy.split()
command.extend(["-r", source, self.target_host + ":" + destination])
self.run_command(command)
def run(self, command, env=None):
"""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)
cmd.extend(command)
return self.run_command(cmd, env=None)
def run_command(self, command, env=None):
"""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
self.log.debug("Remote run: %s", command)
try:
return subprocess.check_output(command, env=env)
except subprocess.CalledProcessError:
raise cdist.Error("Command failed: " + " ".join(command))
except OSError as error:
raise cdist.Error(" ".join(*args) + ": " + error.args[1])
def run_script(self, script, env=None):
"""Run the given script with the given environment on the remote side.
Return the output as a string.
"""
command = self._exec.split()
command.append(self.target_host)
command.extend(["/bin/sh", "-e"])
command.append(script)
self.log.debug("Remote run script: %s", command)
if env:
self.log.debug("Remote run script env: %s", env)
try:
return subprocess.check_output(command, env=env)
except subprocess.CalledProcessError as error:
script_content = self.run(["cat", script])
self.log.error("Code that raised the error:\n%s", script_content)
raise RemoteScriptError(script, command, script_content)
except EnvironmentError as error:
raise cdist.Error(" ".join(command) + ": " + error.args[1])

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lib/cdist/test/exec/__init__.py Normal file
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lib/cdist/test/exec/test_remote.py Normal file
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# -*- coding: utf-8 -*-
#
# 2010-2011 Steven Armstrong (steven-cdist at armstrong.cc)
#
# 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 <http://www.gnu.org/licenses/>.
#
#
import unittest
import os
import tempfile
import getpass
import shutil
import string
import random
import cdist
from cdist.exec import remote
class RemoteTestCase(unittest.TestCase):
def mkdtemp(self, **kwargs):
return tempfile.mkdtemp(prefix='tmp.cdist.test.', **kwargs)
def mkstemp(self, **kwargs):
return tempfile.mkstemp(prefix='tmp.cdist.test.', **kwargs)
def setUp(self):
self.temp_dir = self.mkdtemp()
target_host = 'localhost'
remote_base_path = self.temp_dir
user = getpass.getuser()
remote_exec = "ssh -o User=%s -q" % user
remote_copy = "scp -o User=%s -q" % user
self.remote = remote.Remote(target_host, remote_base_path, remote_exec, remote_copy)
def tearDown(self):
shutil.rmtree(self.temp_dir)
def test_run_success(self):
self.remote.run(['/bin/true'])
def test_run_fail(self):
self.assertRaises(cdist.Error, self.remote.run, ['/bin/false'])
def test_run_script_success(self):
handle, script = self.mkstemp(dir=self.temp_dir)
fd = open(script, "w")
fd.writelines(["#!/bin/sh\n", "/bin/true"])
fd.close()
self.remote.run_script(script)
def test_run_script_fail(self):
handle, script = self.mkstemp(dir=self.temp_dir)
fd = open(script, "w")
fd.writelines(["#!/bin/sh\n", "/bin/false"])
fd.close()
self.assertRaises(remote.RemoteScriptError, self.remote.run_script, script)
def test_run_script_get_output(self):
handle, script = self.mkstemp(dir=self.temp_dir)
fd = open(script, "w")
fd.writelines(["#!/bin/sh\n", "echo foobar"])
fd.close()
self.assertEqual(self.remote.run_script(script), b"foobar\n")
def test_mkdir(self):
temp_dir = self.mkdtemp(dir=self.temp_dir)
os.rmdir(temp_dir)
self.remote.mkdir(temp_dir)
self.assertTrue(os.path.isdir(temp_dir))
def test_rmdir(self):
temp_dir = self.mkdtemp(dir=self.temp_dir)
self.remote.rmdir(temp_dir)
self.assertFalse(os.path.isdir(temp_dir))
def test_transfer_file(self):
handle, source = self.mkstemp(dir=self.temp_dir)
target = self.mkdtemp(dir=self.temp_dir)
self.remote.transfer(source, target)
self.assertTrue(os.path.isfile(target))
def test_transfer_dir(self):
source = self.mkdtemp(dir=self.temp_dir)
# put a file in the directory as payload
handle, source_file = self.mkstemp(dir=source)
source_file_name = os.path.split(source_file)[-1]
target = self.mkdtemp(dir=self.temp_dir)
self.remote.transfer(source, target)
# test if the payload file is in the target directory
self.assertTrue(os.path.isfile(os.path.join(target, source_file_name)))
def test_create_directories(self):
self.remote.create_directories()
self.assertTrue(os.path.isdir(self.remote.base_path))
self.assertTrue(os.path.isdir(self.remote.conf_path))