379 lines
14 KiB
Python
379 lines
14 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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# 2011-2015 Nico Schottelius (nico-cdist at schottelius.org)
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# 2016-2017 Darko Poljak (darko.poljak at gmail.com)
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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 os
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import sys
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import re
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import subprocess
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import shutil
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import logging
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import tempfile
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import time
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import datetime
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import cdist
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import cdist.message
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from cdist import core
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import cdist.exec.util as exec_util
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CONF_SUBDIRS_LINKED = ["explorer", "files", "manifest", "type", ]
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class Local(object):
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"""Execute commands locally.
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All interaction with the local side should be done through this class.
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Directly accessing the local 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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target_host_tags,
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base_root_path,
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host_dir_name,
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exec_path=sys.argv[0],
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initial_manifest=None,
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add_conf_dirs=None,
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cache_path_pattern=None,
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quiet_mode=False):
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self.target_host = target_host
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if target_host_tags is None:
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self.target_host_tags = ""
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else:
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self.target_host_tags = ",".join(target_host_tags)
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self.hostdir = host_dir_name
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self.base_path = os.path.join(base_root_path, "data")
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self.exec_path = exec_path
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self.custom_initial_manifest = initial_manifest
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self._add_conf_dirs = add_conf_dirs
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self.cache_path_pattern = cache_path_pattern
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self.quiet_mode = quiet_mode
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self._init_log()
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self._init_permissions()
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self.mkdir(self.base_path)
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# FIXME: create dir that does not require moving later
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self._init_cache_dir(None)
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self._init_paths()
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self._init_object_marker()
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self._init_conf_dirs()
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@property
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def dist_conf_dir(self):
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return os.path.abspath(os.path.join(os.path.dirname(cdist.__file__),
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"conf"))
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@property
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def home_dir(self):
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return cdist.home_dir()
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def _init_log(self):
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self.log = logging.getLogger(self.target_host[0])
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# logger is not pickable, so remove it when we pickle
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def __getstate__(self):
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state = self.__dict__.copy()
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if 'log' in state:
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del state['log']
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return state
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# recreate logger when we unpickle
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def __setstate__(self, state):
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self.__dict__.update(state)
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self._init_log()
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def _init_permissions(self):
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# Setup file permissions using umask
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os.umask(0o077)
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def _init_paths(self):
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# Depending on out_path
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self.bin_path = os.path.join(self.base_path, "bin")
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self.conf_path = os.path.join(self.base_path, "conf")
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self.global_explorer_out_path = os.path.join(self.base_path,
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"explorer")
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self.object_path = os.path.join(self.base_path, "object")
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self.messages_path = os.path.join(self.base_path, "messages")
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self.files_path = os.path.join(self.conf_path, "files")
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# Depending on conf_path
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self.global_explorer_path = os.path.join(self.conf_path, "explorer")
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self.manifest_path = os.path.join(self.conf_path, "manifest")
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self.initial_manifest = (self.custom_initial_manifest or
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os.path.join(self.manifest_path, "init"))
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self.type_path = os.path.join(self.conf_path, "type")
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def _init_object_marker(self):
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self.object_marker_file = os.path.join(self.base_path, "object_marker")
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# Does not need to be secure - just randomly different from .cdist
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self.object_marker_name = tempfile.mktemp(prefix='.cdist-', dir='')
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def _init_conf_dirs(self):
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self.conf_dirs = []
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self.conf_dirs.append(self.dist_conf_dir)
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# Is the default place for user created explorer, type and manifest
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if self.home_dir:
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self.conf_dirs.append(self.home_dir)
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# Add directories defined in the CDIST_PATH environment variable
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if 'CDIST_PATH' in os.environ:
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cdist_path_dirs = re.split(r'(?<!\\):', os.environ['CDIST_PATH'])
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cdist_path_dirs.reverse()
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self.conf_dirs.extend(cdist_path_dirs)
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# Add command line supplied directories
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if self._add_conf_dirs:
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self.conf_dirs.extend(self._add_conf_dirs)
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def _init_directories(self):
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self.mkdir(self.conf_path)
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self.mkdir(self.global_explorer_out_path)
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self.mkdir(self.object_path)
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self.mkdir(self.bin_path)
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self.mkdir(self.cache_path)
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def create_files_dirs(self):
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self._init_directories()
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self._create_conf_path_and_link_conf_dirs()
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self._create_messages()
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self._link_types_for_emulator()
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self._setup_object_marker_file()
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def _setup_object_marker_file(self):
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with open(self.object_marker_file, 'w') as fd:
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fd.write("%s\n" % self.object_marker_name)
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self.log.trace("Object marker %s saved in %s" % (
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self.object_marker_name, self.object_marker_file))
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def _init_cache_dir(self, cache_dir):
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if cache_dir:
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self.cache_path = cache_dir
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else:
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if self.home_dir:
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self.cache_path = os.path.join(self.home_dir, "cache")
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else:
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raise cdist.Error(
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"No homedir setup and no cache dir location given")
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def rmdir(self, path):
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"""Remove directory on the local side."""
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self.log.trace("Local rmdir: %s", path)
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shutil.rmtree(path)
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def mkdir(self, path):
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"""Create directory on the local side."""
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self.log.trace("Local mkdir: %s", path)
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os.makedirs(path, exist_ok=True)
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def run(self, command, env=None, return_output=False, message_prefix=None,
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save_output=True):
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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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if env is None:
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env = os.environ.copy()
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# Export __target_host, __target_hostname, __target_fqdn
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# for use in __remote_{copy,exec} scripts
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env['__target_host'] = self.target_host[0]
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env['__target_hostname'] = self.target_host[1]
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env['__target_fqdn'] = self.target_host[2]
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# Export for emulator
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env['__cdist_object_marker'] = self.object_marker_name
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if message_prefix:
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message = cdist.message.Message(message_prefix, self.messages_path)
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env.update(message.env)
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self.log.trace("Local run: %s", command)
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try:
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if self.quiet_mode:
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stderr = subprocess.DEVNULL
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else:
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stderr = None
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if save_output:
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output, errout = exec_util.call_get_output(
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command, env=env, stderr=stderr)
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self.log.trace("Local stdout: {}".format(output))
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# Currently, stderr is not captured.
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# self.log.trace("Local stderr: {}".format(errout))
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if return_output:
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return output.decode()
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else:
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# In some cases no output is saved.
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# This is used for shell command, stdout and stderr
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# must not be catched.
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if self.quiet_mode:
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stdout = subprocess.DEVNULL
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else:
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stdout = None
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subprocess.check_call(command, env=env, stderr=stderr,
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stdout=stdout)
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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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finally:
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if message_prefix:
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message.merge_messages()
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def run_script(self, script, env=None, return_output=False,
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message_prefix=None, save_output=True):
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"""Run the given script with the given environment.
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Return the output as a string.
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"""
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if os.access(script, os.X_OK):
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self.log.debug('%s is executable, running it', script)
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command = [script]
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else:
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command = [os.environ.get('CDIST_LOCAL_SHELL', "/bin/sh"), "-e"]
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self.log.debug('%s is NOT executable, running it with %s',
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script, " ".join(command))
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command.append(script)
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return self.run(command=command, env=env, return_output=return_output,
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message_prefix=message_prefix, save_output=save_output)
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def _cache_subpath_repl(self, matchobj):
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if matchobj.group(2) == '%P':
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repl = str(os.getpid())
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elif matchobj.group(2) == '%h':
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repl = self.hostdir
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elif matchobj.group(2) == '%N':
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repl = self.target_host[0]
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return matchobj.group(1) + repl
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def _cache_subpath(self, start_time=time.time(), path_format=None):
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if path_format:
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repl_func = self._cache_subpath_repl
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cache_subpath = re.sub(r'([^%]|^)(%h|%P|%N)', repl_func,
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path_format)
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dt = datetime.datetime.fromtimestamp(start_time)
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cache_subpath = dt.strftime(cache_subpath)
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else:
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cache_subpath = self.hostdir
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i = 0
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while i < len(cache_subpath) and cache_subpath[i] == os.sep:
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i += 1
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cache_subpath = cache_subpath[i:]
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if not cache_subpath:
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cache_subpath = self.hostdir
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return cache_subpath
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def save_cache(self, start_time=time.time()):
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self.log.trace("cache subpath pattern: {}".format(
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self.cache_path_pattern))
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cache_subpath = self._cache_subpath(start_time,
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self.cache_path_pattern)
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self.log.debug("cache subpath: {}".format(cache_subpath))
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destination = os.path.join(self.cache_path, cache_subpath)
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self.log.trace(("Saving cache: " + self.base_path + " to " +
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destination))
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if not os.path.exists(destination):
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shutil.move(self.base_path, destination)
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else:
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for direntry in os.listdir(self.base_path):
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srcentry = os.path.join(self.base_path, direntry)
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destentry = os.path.join(destination, direntry)
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try:
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if os.path.isdir(destentry):
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shutil.rmtree(destentry)
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elif os.path.exists(destentry):
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os.remove(destentry)
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except (PermissionError, OSError) as e:
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raise cdist.Error(
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"Cannot delete old cache entry {}: {}".format(
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destentry, e))
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shutil.move(srcentry, destentry)
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# add target_host since cache dir can be hash-ed target_host
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host_cache_path = os.path.join(destination, "target_host")
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with open(host_cache_path, 'w') as hostf:
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print(self.target_host[0], file=hostf)
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def _create_messages(self):
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"""Create empty messages"""
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with open(self.messages_path, "w"):
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pass
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def _create_conf_path_and_link_conf_dirs(self):
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# Create destination directories
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for sub_dir in CONF_SUBDIRS_LINKED:
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self.mkdir(os.path.join(self.conf_path, sub_dir))
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# Iterate over all directories and link the to the output dir
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for conf_dir in self.conf_dirs:
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self.log.debug("Checking conf_dir %s ..." % (conf_dir))
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for sub_dir in CONF_SUBDIRS_LINKED:
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current_dir = os.path.join(conf_dir, sub_dir)
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# Allow conf dirs to contain only partial content
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if not os.path.exists(current_dir):
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continue
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for entry in os.listdir(current_dir):
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src = os.path.abspath(os.path.join(conf_dir,
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sub_dir,
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entry))
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dst = os.path.join(self.conf_path, sub_dir, entry)
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# Already exists? remove and link
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if os.path.exists(dst):
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os.unlink(dst)
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self.log.trace("Linking %s to %s ..." % (src, dst))
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try:
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os.symlink(src, dst)
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except OSError as e:
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raise cdist.Error("Linking %s %s to %s failed: %s" % (
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sub_dir, src, dst, e.__str__()))
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def _link_types_for_emulator(self):
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"""Link emulator to types"""
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src = os.path.abspath(self.exec_path)
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for cdist_type in core.CdistType.list_types(self.type_path):
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dst = os.path.join(self.bin_path, cdist_type.name)
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self.log.trace("Linking emulator: %s to %s", src, dst)
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try:
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os.symlink(src, dst)
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except OSError as e:
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raise cdist.Error(
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"Linking emulator from %s to %s failed: %s" % (
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src, dst, e.__str__()))
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