cdist configuration management Latest manual: https://www.cdi.st/manual/latest/ Home page: https://www.cdi.st
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# 2010-2015 Nico Schottelius (nico-cdist at schottelius.org)
# 2016-2017 Darko Poljak (darko.poljak at gmail.com)
#
# 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 logging
import os
import sys
import time
import itertools
import tempfile
import socket
import multiprocessing
from cdist.mputil import mp_pool_run, mp_sig_handler
import atexit
import shutil
import cdist
import cdist.hostsource
import cdist.exec.local
import cdist.exec.remote
from cdist import inventory
import cdist.util.ipaddr as ipaddr
from cdist import core
from cdist.util.remoteutil import inspect_ssh_mux_opts
class Config(object):
"""Cdist main class to hold arbitrary data"""
def __init__(self, local, remote, dry_run=False, jobs=None):
self.local = local
self.remote = remote
self._open_logger()
self.dry_run = dry_run
self.jobs = jobs
self.explorer = core.Explorer(self.local.target_host, self.local,
self.remote, jobs=self.jobs)
self.manifest = core.Manifest(self.local.target_host, self.local)
self.code = core.Code(self.local.target_host, self.local, self.remote)
def _init_files_dirs(self):
"""Prepare files and directories for the run"""
self.local.create_files_dirs()
self.remote.create_files_dirs()
@staticmethod
def hosts(source):
try:
yield from cdist.hostsource.HostSource(source)()
except (IOError, OSError, UnicodeError) as e:
raise cdist.Error(
"Error reading hosts from \'{}\': {}".format(
source, e))
@staticmethod
def construct_remote_exec_copy_patterns(args):
# default remote cmd patterns
args.remote_exec_pattern = None
args.remote_copy_pattern = None
args_dict = vars(args)
# if remote-exec and/or remote-copy args are None then user
# didn't specify command line options nor env vars:
# inspect multiplexing options for default cdist.REMOTE_COPY/EXEC
if (args_dict['remote_copy'] is None or
args_dict['remote_exec'] is None):
mux_opts = inspect_ssh_mux_opts()
if args_dict['remote_exec'] is None:
args.remote_exec_pattern = cdist.REMOTE_EXEC + mux_opts
if args_dict['remote_copy'] is None:
args.remote_copy_pattern = cdist.REMOTE_COPY + mux_opts
@classmethod
def _check_and_prepare_args(cls, args):
if args.manifest == '-' and args.hostfile == '-':
raise cdist.Error(("Cannot read both, manifest and host file, "
"from stdin"))
# if no host source is specified then read hosts from stdin
if not (args.hostfile or args.host):
args.hostfile = '-'
initial_manifest_tempfile = None
if args.manifest == '-':
# read initial manifest from stdin
try:
handle, initial_manifest_temp_path = tempfile.mkstemp(
prefix='cdist.stdin.')
with os.fdopen(handle, 'w') as fd:
fd.write(sys.stdin.read())
except (IOError, OSError) as e:
raise cdist.Error(("Creating tempfile for stdin data "
"failed: %s" % e))
args.manifest = initial_manifest_temp_path
atexit.register(lambda: os.remove(initial_manifest_temp_path))
@classmethod
def commandline(cls, args):
"""Configure remote system"""
# No new child process if only one host at a time.
if args.parallel == 1:
log.debug("Only 1 parallel process, doing it sequentially")
args.parallel = 0
if args.parallel or args.jobs:
# If parallel execution then also log process id
del logging.getLogger().handlers[:]
log_format = '%(levelname)s: [%(process)d]: %(message)s'
logging.basicConfig(format=log_format)
if args.parallel:
import signal
signal.signal(signal.SIGTERM, mp_sig_handler)
signal.signal(signal.SIGHUP, mp_sig_handler)
# FIXME: Refactor relict - remove later
log = logging.getLogger("cdist")
cls._check_and_prepare_args(args)
failed_hosts = []
time_start = time.time()
cls.construct_remote_exec_copy_patterns(args)
base_root_path = cls.create_base_root_path(args.out_path)
hostcnt = 0
if args.tag or args.all_tagged_hosts:
inventory.determine_default_inventory_dir(args)
if args.all_tagged_hosts:
inv_list = inventory.InventoryList(
hosts=None, istag=True, hostfile=None,
db_basedir=args.inventory_dir)
else:
inv_list = inventory.InventoryList(
hosts=args.host, istag=True, hostfile=args.hostfile,
db_basedir=args.inventory_dir,
has_all_tags=args.has_all_tags)
it = inv_list.entries()
else:
it = itertools.chain(cls.hosts(args.host),
cls.hosts(args.hostfile))
process_args = []
if args.parallel:
log.trace("Processing hosts in parallel")
else:
log.trace("Processing hosts sequentially")
for entry in it:
if isinstance(entry, tuple):
# if configuring by specified tags
host = entry[0]
host_tags = entry[1]
else:
# if configuring by host then check inventory for tags
host = entry
inventory.determine_default_inventory_dir(args)
inv_list = inventory.InventoryList(
hosts=(host,), db_basedir=args.inventory_dir)
inv = tuple(inv_list.entries())
if inv:
# host is present in inventory and has tags
host_tags = inv[0][1]
else:
# host is not present in inventory or has no tags
host_tags = None
host_base_path, hostdir = cls.create_host_base_dirs(
host, base_root_path)
log.debug("Base root path for target host \"{}\" is \"{}\"".format(
host, host_base_path))
hostcnt += 1
if args.parallel:
pargs = (host, host_tags, host_base_path, hostdir, args, True)
log.trace(("Args for multiprocessing operation "
"for host {}: {}".format(host, pargs)))
process_args.append(pargs)
else:
try:
cls.onehost(host, host_tags, host_base_path, hostdir,
args, parallel=False)
except cdist.Error as e:
failed_hosts.append(host)
if args.parallel and len(process_args) == 1:
log.debug("Only 1 host for parallel processing, doing it "
"sequentially")
try:
cls.onehost(*process_args[0])
except cdist.Error as e:
failed_hosts.append(host)
elif args.parallel:
log.trace("Multiprocessing start method is {}".format(
multiprocessing.get_start_method()))
log.trace(("Starting multiprocessing Pool for {} "
"parallel host operation".format(args.parallel)))
results = mp_pool_run(cls.onehost,
process_args,
jobs=args.parallel)
log.trace(("Multiprocessing for parallel host operation "
"finished"))
log.trace("Multiprocessing for parallel host operation "
"results: %s", results)
failed_hosts = [host for host, result in results if not result]
time_end = time.time()
log.verbose("Total processing time for %s host(s): %s", hostcnt,
(time_end - time_start))
if len(failed_hosts) > 0:
raise cdist.Error("Failed to configure the following hosts: " +
" ".join(failed_hosts))
@classmethod
def _resolve_ssh_control_path(cls):
base_path = tempfile.mkdtemp()
control_path = os.path.join(base_path, "s")
atexit.register(lambda: shutil.rmtree(base_path))
return control_path
@classmethod
def _resolve_remote_cmds(cls, args):
control_path = cls._resolve_ssh_control_path()
# If we constructed patterns for remote commands then there is
# placeholder for ssh ControlPath, format it and we have unique
# ControlPath for each host.
#
# If not then use args.remote_exec/copy that user specified.
if args.remote_exec_pattern:
remote_exec = args.remote_exec_pattern.format(control_path)
else:
remote_exec = args.remote_exec
if args.remote_copy_pattern:
remote_copy = args.remote_copy_pattern.format(control_path)
else:
remote_copy = args.remote_copy
return (remote_exec, remote_copy, )
@classmethod
def onehost(cls, host, host_tags, host_base_path, host_dir_name, args,
parallel):
"""Configure ONE system.
If operating in parallel then return tuple (host, True|False, )
so that main process knows for which host function was successful.
"""
log = logging.getLogger(host)
try:
remote_exec, remote_copy = cls._resolve_remote_cmds(args)
log.debug("remote_exec for host \"{}\": {}".format(
host, remote_exec))
log.debug("remote_copy for host \"{}\": {}".format(
host, remote_copy))
target_host = ipaddr.resolve_target_addresses(host)
log.debug("target_host: {}".format(target_host))
local = cdist.exec.local.Local(
target_host=target_host,
target_host_tags=host_tags,
base_root_path=host_base_path,
host_dir_name=host_dir_name,
initial_manifest=args.manifest,
add_conf_dirs=args.conf_dir,
cache_path_pattern=args.cache_path_pattern,
quiet_mode=args.quiet)
remote = cdist.exec.remote.Remote(
target_host=target_host,
remote_exec=remote_exec,
remote_copy=remote_copy,
base_path=args.remote_out_path,
quiet_mode=args.quiet)
c = cls(local, remote, dry_run=args.dry_run, jobs=args.jobs)
c.run()
except cdist.Error as e:
log.error(e)
if parallel:
return (host, False, )
else:
raise
if parallel:
return (host, True, )
@staticmethod
def create_base_root_path(out_path=None):
if out_path:
base_root_path = out_path
else:
base_root_path = tempfile.mkdtemp()
return base_root_path
@staticmethod
def create_host_base_dirs(host, base_root_path):
hostdir = cdist.str_hash(host)
host_base_path = os.path.join(base_root_path, hostdir)
return (host_base_path, hostdir)
def run(self):
"""Do what is most often done: deploy & cleanup"""
start_time = time.time()
self.log.info("Starting configuration run")
self._init_files_dirs()
self.explorer.run_global_explorers(self.local.global_explorer_out_path)
self.manifest.run_initial_manifest(self.local.initial_manifest)
self.iterate_until_finished()
self.local.save_cache(start_time)
self.log.info("Finished successful run in {:.2f} seconds".format(
time.time() - start_time))
def object_list(self):
"""Short name for object list retrieval"""
for cdist_object in core.CdistObject.list_objects(
self.local.object_path, self.local.type_path,
self.local.object_marker_name):
if cdist_object.cdist_type.is_install:
self.log.debug(("Running in config mode, ignoring install "
"object: {0}").format(cdist_object))
else:
yield cdist_object
def iterate_once(self):
"""
Iterate over the objects once - helper method for
iterate_until_finished
"""
if self.jobs:
objects_changed = self._iterate_once_parallel()
else:
objects_changed = self._iterate_once_sequential()
return objects_changed
def _iterate_once_sequential(self):
self.log.debug("Iteration in sequential mode")
objects_changed = False
for cdist_object in self.object_list():
if cdist_object.requirements_unfinished(cdist_object.requirements):
"""We cannot do anything for this poor object"""
continue
if cdist_object.state == core.CdistObject.STATE_UNDEF:
"""Prepare the virgin object"""
self.object_prepare(cdist_object)
objects_changed = True
if cdist_object.requirements_unfinished(cdist_object.autorequire):
"""The previous step created objects we depend on -
wait for them
"""
continue
if cdist_object.state == core.CdistObject.STATE_PREPARED:
self.object_run(cdist_object)
objects_changed = True
return objects_changed
def _iterate_once_parallel(self):
self.log.debug("Iteration in parallel mode in {} jobs".format(
self.jobs))
objects_changed = False
cargo = []
for cdist_object in self.object_list():
if cdist_object.requirements_unfinished(cdist_object.requirements):
"""We cannot do anything for this poor object"""
continue
if cdist_object.state == core.CdistObject.STATE_UNDEF:
"""Prepare the virgin object"""
# self.object_prepare(cdist_object)
# objects_changed = True
cargo.append(cdist_object)
n = len(cargo)
if n == 1:
self.log.debug("Only one object, preparing sequentially")
self.object_prepare(cargo[0])
objects_changed = True
elif cargo:
self.log.trace("Multiprocessing start method is {}".format(
multiprocessing.get_start_method()))
self.log.trace("Multiprocessing cargo: %s", cargo)
cargo_types = set()
for c in cargo:
cargo_types.add(c.cdist_type)
self.log.trace("Multiprocessing cargo_types: %s", cargo_types)
nt = len(cargo_types)
if nt == 1:
self.log.debug(("Only one type, transfering explorers "
"sequentially"))
self.explorer.transfer_type_explorers(cargo_types.pop())
else:
self.log.trace(("Starting multiprocessing Pool for {} "
"parallel transfering types' explorers".format(
nt)))
args = [
(ct, ) for ct in cargo_types
]
mp_pool_run(self.explorer.transfer_type_explorers, args,
jobs=self.jobs)
self.log.trace(("Multiprocessing for parallel transfering "
"types' explorers finished"))
self.log.trace(("Starting multiprocessing Pool for {} parallel "
"objects preparation".format(n)))
args = [
(c, False, ) for c in cargo
]
mp_pool_run(self.object_prepare, args, jobs=self.jobs)
self.log.trace(("Multiprocessing for parallel object "
"preparation finished"))
objects_changed = True
del cargo[:]
for cdist_object in self.object_list():
if cdist_object.requirements_unfinished(cdist_object.requirements):
"""We cannot do anything for this poor object"""
continue
if cdist_object.state == core.CdistObject.STATE_PREPARED:
if cdist_object.requirements_unfinished(
cdist_object.autorequire):
"""The previous step created objects we depend on -
wait for them
"""
continue
# self.object_run(cdist_object)
# objects_changed = True
# put objects in chuncks of distinct types
# so that there is no more than one object
# of the same type in one chunk because there is a
# possibility of object's process locking which
# prevents parallel execution at remote
# and do this only for nonparallel marked types
for chunk in cargo:
for obj in chunk:
if (obj.cdist_type == cdist_object.cdist_type and
cdist_object.cdist_type.is_nonparallel):
break
else:
chunk.append(cdist_object)
break
else:
chunk = [cdist_object, ]
cargo.append(chunk)
for chunk in cargo:
self.log.trace("Running chunk: %s", chunk)
n = len(chunk)
if n == 1:
self.log.debug("Only one object, running sequentially")
self.object_run(chunk[0])
objects_changed = True
elif chunk:
self.log.trace("Multiprocessing start method is {}".format(
multiprocessing.get_start_method()))
self.log.trace(("Starting multiprocessing Pool for {} "
"parallel object run".format(n)))
args = [
(c, ) for c in chunk
]
mp_pool_run(self.object_run, args, jobs=self.jobs)
self.log.trace(("Multiprocessing for parallel object "
"run finished"))
objects_changed = True
return objects_changed
def _open_logger(self):
self.log = logging.getLogger(self.local.target_host[0])
# logger is not pickable, so remove it when we pickle
def __getstate__(self):
state = self.__dict__.copy()
if 'log' in state:
del state['log']
return state
# recreate logger when we unpickle
def __setstate__(self, state):
self.__dict__.update(state)
self._open_logger()
def iterate_until_finished(self):
"""
Go through all objects and solve them
one after another
"""
objects_changed = True
while objects_changed:
objects_changed = self.iterate_once()
# Check whether all objects have been finished
unfinished_objects = []
for cdist_object in self.object_list():
if not cdist_object.state == cdist_object.STATE_DONE:
unfinished_objects.append(cdist_object)
if unfinished_objects:
info_string = []
for cdist_object in unfinished_objects:
requirement_names = []
autorequire_names = []
for requirement in cdist_object.requirements_unfinished(
cdist_object.requirements):
requirement_names.append(requirement.name)
for requirement in cdist_object.requirements_unfinished(
cdist_object.autorequire):
autorequire_names.append(requirement.name)
requirements = "\n ".join(requirement_names)
autorequire = "\n ".join(autorequire_names)
info_string.append(("%s requires:\n"
" %s\n"
"%s ""autorequires:\n"
" %s" % (
cdist_object.name,
requirements, cdist_object.name,
autorequire)))
raise cdist.UnresolvableRequirementsError(
("The requirements of the following objects could not be "
"resolved:\n%s") % ("\n".join(info_string)))
def object_prepare(self, cdist_object, transfer_type_explorers=True):
"""Prepare object: Run type explorer + manifest"""
self.log.verbose("Preparing object {}".format(cdist_object.name))
self.log.verbose(
"Running manifest and explorers for " + cdist_object.name)
self.explorer.run_type_explorers(cdist_object, transfer_type_explorers)
self.manifest.run_type_manifest(cdist_object)
cdist_object.state = core.CdistObject.STATE_PREPARED
def object_run(self, cdist_object):
"""Run gencode and code for an object"""
self.log.verbose("Running object " + cdist_object.name)
if cdist_object.state == core.CdistObject.STATE_DONE:
raise cdist.Error(("Attempting to run an already finished "
"object: %s"), cdist_object)
cdist_type = cdist_object.cdist_type
# Generate
self.log.debug("Generating code for %s" % (cdist_object.name))
cdist_object.code_local = self.code.run_gencode_local(cdist_object)
cdist_object.code_remote = self.code.run_gencode_remote(cdist_object)
if cdist_object.code_local or cdist_object.code_remote:
cdist_object.changed = True
# Execute
if not self.dry_run:
if cdist_object.code_local or cdist_object.code_remote:
self.log.info("Processing %s" % (cdist_object.name))
if cdist_object.code_local:
self.log.trace("Executing local code for %s"
% (cdist_object.name))
self.code.run_code_local(cdist_object)
if cdist_object.code_remote:
self.log.trace("Executing remote code for %s"
% (cdist_object.name))
self.code.transfer_code_remote(cdist_object)
self.code.run_code_remote(cdist_object)
else:
self.log.verbose("Skipping code execution due to DRY RUN")
# Mark this object as done
self.log.trace("Finishing run of " + cdist_object.name)
cdist_object.state = core.CdistObject.STATE_DONE