You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
454 lines
14 KiB
Python
454 lines
14 KiB
Python
# Copyright 2017, David Wilson
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions are met:
|
|
#
|
|
# 1. Redistributions of source code must retain the above copyright notice,
|
|
# this list of conditions and the following disclaimer.
|
|
#
|
|
# 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
# this list of conditions and the following disclaimer in the documentation
|
|
# and/or other materials provided with the distribution.
|
|
#
|
|
# 3. Neither the name of the copyright holder nor the names of its contributors
|
|
# may be used to endorse or promote products derived from this software without
|
|
# specific prior written permission.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
|
|
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
# POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
"""
|
|
Helper functions intended to be executed on the target. These are entrypoints
|
|
for file transfer, module execution and sundry bits like changing file modes.
|
|
"""
|
|
|
|
from __future__ import absolute_import
|
|
import cStringIO
|
|
import json
|
|
import logging
|
|
import operator
|
|
import os
|
|
import pwd
|
|
import random
|
|
import re
|
|
import stat
|
|
import subprocess
|
|
import tempfile
|
|
import traceback
|
|
import zlib
|
|
|
|
import ansible.module_utils.json_utils
|
|
import ansible_mitogen.runner
|
|
import ansible_mitogen.services
|
|
import mitogen.core
|
|
import mitogen.fork
|
|
import mitogen.parent
|
|
import mitogen.service
|
|
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
#: Caching of fetched file data.
|
|
_file_cache = {}
|
|
|
|
#: Initialized to an econtext.parent.Context pointing at a pristine fork of
|
|
#: the target Python interpreter before it executes any code or imports.
|
|
_fork_parent = None
|
|
|
|
|
|
def _get_file(context, path, out_fp):
|
|
"""
|
|
Streamily download a file from the connection multiplexer process in the
|
|
controller.
|
|
|
|
:param mitogen.core.Context context:
|
|
Reference to the context hosting the FileService that will be used to
|
|
fetch the file.
|
|
:param bytes in_path:
|
|
FileService registered name of the input file.
|
|
:param bytes out_path:
|
|
Name of the output path on the local disk.
|
|
:returns:
|
|
:data:`True` on success, or :data:`False` if the transfer was
|
|
interrupted and the output should be discarded.
|
|
"""
|
|
LOG.debug('_get_file(): fetching %r from %r', path, context)
|
|
recv = mitogen.core.Receiver(router=context.router)
|
|
size = mitogen.service.call(
|
|
context=context,
|
|
handle=ansible_mitogen.services.FileService.handle,
|
|
method='fetch',
|
|
kwargs={
|
|
'path': path,
|
|
'sender': recv.to_sender()
|
|
}
|
|
)
|
|
|
|
for chunk in recv:
|
|
s = chunk.unpickle()
|
|
LOG.debug('_get_file(%r): received %d bytes', path, len(s))
|
|
out_fp.write(s)
|
|
|
|
if out_fp.tell() != size:
|
|
LOG.error('get_file(%r): receiver was closed early, controller '
|
|
'is likely shutting down.', path)
|
|
|
|
LOG.debug('target.get_file(): fetched %d bytes of %r from %r',
|
|
size, path, context)
|
|
return out_fp.tell() == size
|
|
|
|
|
|
def get_file(context, path):
|
|
"""
|
|
Basic in-memory caching module fetcher. This generates an one roundtrip for
|
|
every previously unseen file, so it is only a temporary solution.
|
|
|
|
:param context:
|
|
Context we should direct FileService requests to. For now (and probably
|
|
forever) this is just the top-level Mitogen connection manager process.
|
|
:param path:
|
|
Path to fetch from FileService, must previously have been registered by
|
|
a privileged context using the `register` command.
|
|
:returns:
|
|
Bytestring file data.
|
|
"""
|
|
if path not in _file_cache:
|
|
io = cStringIO.StringIO()
|
|
if not _get_file(context, path, io):
|
|
raise IOError('transfer of %r was interrupted.' % (path,))
|
|
_file_cache[path] = io.getvalue()
|
|
return _file_cache[path]
|
|
|
|
|
|
def transfer_file(context, in_path, out_path):
|
|
"""
|
|
Streamily download a file from the connection multiplexer process in the
|
|
controller.
|
|
|
|
:param mitogen.core.Context context:
|
|
Reference to the context hosting the FileService that will be used to
|
|
fetch the file.
|
|
:param bytes in_path:
|
|
FileService registered name of the input file.
|
|
:param bytes out_path:
|
|
Name of the output path on the local disk.
|
|
"""
|
|
fp = open(out_path+'.tmp', 'wb', mitogen.core.CHUNK_SIZE)
|
|
try:
|
|
try:
|
|
if not _get_file(context, in_path, fp):
|
|
raise IOError('transfer of %r was interrupted.' % (in_path,))
|
|
except Exception:
|
|
os.unlink(fp.name)
|
|
raise
|
|
finally:
|
|
fp.close()
|
|
|
|
os.rename(out_path + '.tmp', out_path)
|
|
|
|
|
|
@mitogen.core.takes_econtext
|
|
def start_fork_parent(econtext):
|
|
"""
|
|
Called by ContextService immediately after connection; arranges for the
|
|
(presently) spotless Python interpreter to be forked, where the newly
|
|
forked interpreter becomes the parent of any newly forked future
|
|
interpreters.
|
|
|
|
This is necessary to prevent modules that are executed in-process from
|
|
polluting the global interpreter state in a way that effects explicitly
|
|
isolated modules.
|
|
"""
|
|
global _fork_parent
|
|
mitogen.parent.upgrade_router(econtext)
|
|
_fork_parent = econtext.router.fork()
|
|
|
|
|
|
@mitogen.core.takes_econtext
|
|
def start_fork_child(wrap_async, kwargs, econtext):
|
|
mitogen.parent.upgrade_router(econtext)
|
|
context = econtext.router.fork()
|
|
if not wrap_async:
|
|
try:
|
|
return context.call(run_module, kwargs)
|
|
finally:
|
|
context.shutdown()
|
|
|
|
job_id = '%016x' % random.randint(0, 2**64)
|
|
context.call_async(run_module_async, job_id, kwargs)
|
|
return {
|
|
'stdout': json.dumps({
|
|
# modules/utilities/logic/async_wrapper.py::_run_module().
|
|
'changed': True,
|
|
'started': 1,
|
|
'finished': 0,
|
|
'ansible_job_id': job_id,
|
|
})
|
|
}
|
|
|
|
|
|
@mitogen.core.takes_econtext
|
|
def run_module(kwargs, econtext):
|
|
"""
|
|
Set up the process environment in preparation for running an Ansible
|
|
module. This monkey-patches the Ansible libraries in various places to
|
|
prevent it from trying to kill the process on completion, and to prevent it
|
|
from reading sys.stdin.
|
|
"""
|
|
should_fork = kwargs.pop('should_fork', False)
|
|
wrap_async = kwargs.pop('wrap_async', False)
|
|
if should_fork:
|
|
return _fork_parent.call(start_fork_child, wrap_async, kwargs)
|
|
|
|
runner_name = kwargs.pop('runner_name')
|
|
klass = getattr(ansible_mitogen.runner, runner_name)
|
|
impl = klass(**kwargs)
|
|
return impl.run()
|
|
|
|
|
|
def _get_async_dir():
|
|
return os.path.expanduser(
|
|
os.environ.get('ANSIBLE_ASYNC_DIR', '~/.ansible_async')
|
|
)
|
|
|
|
|
|
def _write_job_status(job_id, dct):
|
|
"""
|
|
Update an async job status file.
|
|
"""
|
|
LOG.info('_write_job_status(%r, %r)', job_id, dct)
|
|
dct.setdefault('ansible_job_id', job_id)
|
|
dct.setdefault('data', '')
|
|
|
|
async_dir = _get_async_dir()
|
|
if not os.path.exists(async_dir):
|
|
os.makedirs(async_dir)
|
|
|
|
path = os.path.join(async_dir, job_id)
|
|
with open(path + '.tmp', 'w') as fp:
|
|
fp.write(json.dumps(dct))
|
|
os.rename(path + '.tmp', path)
|
|
|
|
|
|
def _run_module_async(job_id, kwargs, econtext):
|
|
"""
|
|
Body on run_module_async().
|
|
|
|
1. Immediately updates the status file to mark the job as started.
|
|
2. Installs a timer/signal handler to implement the time limit.
|
|
3. Runs as with run_module(), writing the result to the status file.
|
|
"""
|
|
_write_job_status(job_id, {
|
|
'started': 1,
|
|
'finished': 0
|
|
})
|
|
|
|
kwargs['emulate_tty'] = False
|
|
dct = run_module(kwargs, econtext)
|
|
if mitogen.core.PY3:
|
|
for key in 'stdout', 'stderr':
|
|
dct[key] = dct[key].decode('utf-8', 'surrogateescape')
|
|
|
|
try:
|
|
filtered, warnings = (
|
|
ansible.module_utils.json_utils.
|
|
_filter_non_json_lines(dct['stdout'])
|
|
)
|
|
result = json.loads(filtered)
|
|
result.setdefault('warnings', []).extend(warnings)
|
|
result['stderr'] = dct['stderr']
|
|
_write_job_status(job_id, result)
|
|
except Exception:
|
|
_write_job_status(job_id, {
|
|
"failed": 1,
|
|
"msg": traceback.format_exc(),
|
|
"data": dct['stdout'], # temporary notice only
|
|
"stderr": dct['stderr']
|
|
})
|
|
|
|
|
|
@mitogen.core.takes_econtext
|
|
def run_module_async(job_id, kwargs, econtext):
|
|
"""
|
|
Since run_module_async() is invoked with .call_async(), with nothing to
|
|
read the result from the corresponding Receiver, wrap the body in an
|
|
exception logger, and wrap that in something that tears down the context on
|
|
completion.
|
|
"""
|
|
try:
|
|
try:
|
|
_run_module_async(job_id, kwargs, econtext)
|
|
except Exception:
|
|
LOG.exception('_run_module_async crashed')
|
|
finally:
|
|
econtext.broker.shutdown()
|
|
|
|
|
|
def make_temp_directory(base_dir):
|
|
"""
|
|
Handle creation of `base_dir` if it is absent, in addition to a unique
|
|
temporary directory within `base_dir`.
|
|
|
|
:returns:
|
|
Newly created temporary directory.
|
|
"""
|
|
if not os.path.exists(base_dir):
|
|
os.makedirs(base_dir, mode=int('0700', 8))
|
|
return tempfile.mkdtemp(
|
|
dir=base_dir,
|
|
prefix='ansible-mitogen-tmp-',
|
|
)
|
|
|
|
|
|
def get_user_shell():
|
|
"""
|
|
For commands executed directly via an SSH command-line, SSH looks up the
|
|
user's shell via getpwuid() and only defaults to /bin/sh if that field is
|
|
missing or empty.
|
|
"""
|
|
try:
|
|
pw_shell = pwd.getpwuid(os.geteuid()).pw_shell
|
|
except KeyError:
|
|
pw_shell = None
|
|
|
|
return pw_shell or '/bin/sh'
|
|
|
|
|
|
def exec_args(args, in_data='', chdir=None, shell=None, emulate_tty=False):
|
|
"""
|
|
Run a command in a subprocess, emulating the argument handling behaviour of
|
|
SSH.
|
|
|
|
:param list[str]:
|
|
Argument vector.
|
|
:param bytes in_data:
|
|
Optional standard input for the command.
|
|
:param bool emulate_tty:
|
|
If :data:`True`, arrange for stdout and stderr to be merged into the
|
|
stdout pipe and for LF to be translated into CRLF, emulating the
|
|
behaviour of a TTY.
|
|
:return:
|
|
(return code, stdout bytes, stderr bytes)
|
|
"""
|
|
LOG.debug('exec_args(%r, ..., chdir=%r)', args, chdir)
|
|
assert isinstance(args, list)
|
|
|
|
if emulate_tty:
|
|
stderr = subprocess.STDOUT
|
|
else:
|
|
stderr = subprocess.PIPE
|
|
|
|
proc = subprocess.Popen(
|
|
args=args,
|
|
stdout=subprocess.PIPE,
|
|
stderr=stderr,
|
|
stdin=subprocess.PIPE,
|
|
cwd=chdir,
|
|
)
|
|
stdout, stderr = proc.communicate(in_data)
|
|
|
|
if emulate_tty:
|
|
stdout = stdout.replace('\n', '\r\n')
|
|
return proc.returncode, stdout, stderr or ''
|
|
|
|
|
|
def exec_command(cmd, in_data='', chdir=None, shell=None, emulate_tty=False):
|
|
"""
|
|
Run a command in a subprocess, emulating the argument handling behaviour of
|
|
SSH.
|
|
|
|
:param bytes cmd:
|
|
String command line, passed to user's shell.
|
|
:param bytes in_data:
|
|
Optional standard input for the command.
|
|
:return:
|
|
(return code, stdout bytes, stderr bytes)
|
|
"""
|
|
assert isinstance(cmd, basestring)
|
|
return exec_args(
|
|
args=[get_user_shell(), '-c', cmd],
|
|
in_data=in_data,
|
|
chdir=chdir,
|
|
shell=shell,
|
|
emulate_tty=emulate_tty,
|
|
)
|
|
|
|
|
|
def read_path(path):
|
|
"""
|
|
Fetch the contents of a filesystem `path` as bytes.
|
|
"""
|
|
return open(path, 'rb').read()
|
|
|
|
|
|
def write_path(path, s):
|
|
"""
|
|
Writes bytes `s` to a filesystem `path`.
|
|
"""
|
|
open(path, 'wb').write(s)
|
|
|
|
|
|
CHMOD_CLAUSE_PAT = re.compile(r'([uoga]*)([+\-=])([ugo]|[rwx]*)')
|
|
CHMOD_MASKS = {
|
|
'u': stat.S_IRWXU,
|
|
'g': stat.S_IRWXG,
|
|
'o': stat.S_IRWXO,
|
|
'a': (stat.S_IRWXU | stat.S_IRWXG | stat.S_IRWXO),
|
|
}
|
|
CHMOD_BITS = {
|
|
'u': {'r': stat.S_IRUSR, 'w': stat.S_IWUSR, 'x': stat.S_IXUSR},
|
|
'g': {'r': stat.S_IRGRP, 'w': stat.S_IWGRP, 'x': stat.S_IXGRP},
|
|
'o': {'r': stat.S_IROTH, 'w': stat.S_IWOTH, 'x': stat.S_IXOTH},
|
|
'a': {
|
|
'r': (stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH),
|
|
'w': (stat.S_IWUSR | stat.S_IWGRP | stat.S_IWOTH),
|
|
'x': (stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)
|
|
}
|
|
}
|
|
|
|
|
|
def apply_mode_spec(spec, mode):
|
|
"""
|
|
Given a symbolic file mode change specification in the style of chmod(1)
|
|
`spec`, apply changes in the specification to the numeric file mode `mode`.
|
|
"""
|
|
for clause in spec.split(','):
|
|
match = CHMOD_CLAUSE_PAT.match(clause)
|
|
who, op, perms = match.groups()
|
|
for ch in who or 'a':
|
|
mask = CHMOD_MASKS[ch]
|
|
bits = CHMOD_BITS[ch]
|
|
cur_perm_bits = mode & mask
|
|
new_perm_bits = reduce(operator.or_, (bits[p] for p in perms), 0)
|
|
mode &= ~mask
|
|
if op == '=':
|
|
mode |= new_perm_bits
|
|
elif op == '+':
|
|
mode |= new_perm_bits | cur_perm_bits
|
|
else:
|
|
mode |= cur_perm_bits & ~new_perm_bits
|
|
return mode
|
|
|
|
|
|
def set_file_mode(path, spec):
|
|
"""
|
|
Update the permissions of a file using the same syntax as chmod(1).
|
|
"""
|
|
mode = os.stat(path).st_mode
|
|
|
|
if spec.isdigit():
|
|
new_mode = int(spec, 8)
|
|
else:
|
|
new_mode = apply_mode_spec(spec, mode)
|
|
|
|
os.chmod(path, new_mode)
|