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228
plugins/connection/lxc.py
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228
plugins/connection/lxc.py
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# (c) 2015, Joerg Thalheim <joerg@higgsboson.tk>
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# Copyright (c) 2017 Ansible Project
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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DOCUMENTATION = '''
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author: Joerg Thalheim <joerg@higgsboson.tk>
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connection: lxc
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short_description: Run tasks in lxc containers via lxc python library
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description:
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- Run commands or put/fetch files to an existing lxc container using lxc python library
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options:
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remote_addr:
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description:
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- Container identifier
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default: inventory_hostname
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vars:
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- name: ansible_host
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- name: ansible_lxc_host
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executable:
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default: /bin/sh
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description:
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- Shell executable
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vars:
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- name: ansible_executable
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- name: ansible_lxc_executable
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'''
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import os
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import shutil
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import traceback
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import select
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import fcntl
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import errno
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HAS_LIBLXC = False
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try:
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import lxc as _lxc
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HAS_LIBLXC = True
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except ImportError:
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pass
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from ansible import constants as C
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from ansible import errors
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from ansible.module_utils._text import to_bytes, to_native
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from ansible.plugins.connection import ConnectionBase
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class Connection(ConnectionBase):
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''' Local lxc based connections '''
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transport = 'community.general.lxc'
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has_pipelining = True
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default_user = 'root'
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def __init__(self, play_context, new_stdin, *args, **kwargs):
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super(Connection, self).__init__(play_context, new_stdin, *args, **kwargs)
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self.container_name = self._play_context.remote_addr
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self.container = None
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def _connect(self):
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''' connect to the lxc; nothing to do here '''
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super(Connection, self)._connect()
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if not HAS_LIBLXC:
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msg = "lxc bindings for python2 are not installed"
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raise errors.AnsibleError(msg)
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if self.container:
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return
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self._display.vvv("THIS IS A LOCAL LXC DIR", host=self.container_name)
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self.container = _lxc.Container(self.container_name)
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if self.container.state == "STOPPED":
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raise errors.AnsibleError("%s is not running" % self.container_name)
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def _communicate(self, pid, in_data, stdin, stdout, stderr):
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buf = {stdout: [], stderr: []}
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read_fds = [stdout, stderr]
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if in_data:
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write_fds = [stdin]
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else:
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write_fds = []
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while len(read_fds) > 0 or len(write_fds) > 0:
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try:
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ready_reads, ready_writes, _ = select.select(read_fds, write_fds, [])
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except select.error as e:
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if e.args[0] == errno.EINTR:
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continue
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raise
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for fd in ready_writes:
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in_data = in_data[os.write(fd, in_data):]
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if len(in_data) == 0:
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write_fds.remove(fd)
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for fd in ready_reads:
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data = os.read(fd, 32768)
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if not data:
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read_fds.remove(fd)
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buf[fd].append(data)
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(pid, returncode) = os.waitpid(pid, 0)
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return returncode, b"".join(buf[stdout]), b"".join(buf[stderr])
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def _set_nonblocking(self, fd):
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flags = fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK
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fcntl.fcntl(fd, fcntl.F_SETFL, flags)
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return fd
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def exec_command(self, cmd, in_data=None, sudoable=False):
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''' run a command on the chroot '''
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super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
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# python2-lxc needs bytes. python3-lxc needs text.
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executable = to_native(self._play_context.executable, errors='surrogate_or_strict')
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local_cmd = [executable, '-c', to_native(cmd, errors='surrogate_or_strict')]
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read_stdout, write_stdout = None, None
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read_stderr, write_stderr = None, None
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read_stdin, write_stdin = None, None
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try:
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read_stdout, write_stdout = os.pipe()
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read_stderr, write_stderr = os.pipe()
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kwargs = {
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'stdout': self._set_nonblocking(write_stdout),
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'stderr': self._set_nonblocking(write_stderr),
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'env_policy': _lxc.LXC_ATTACH_CLEAR_ENV
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}
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if in_data:
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read_stdin, write_stdin = os.pipe()
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kwargs['stdin'] = self._set_nonblocking(read_stdin)
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self._display.vvv("EXEC %s" % (local_cmd), host=self.container_name)
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pid = self.container.attach(_lxc.attach_run_command, local_cmd, **kwargs)
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if pid == -1:
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msg = "failed to attach to container %s" % self.container_name
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raise errors.AnsibleError(msg)
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write_stdout = os.close(write_stdout)
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write_stderr = os.close(write_stderr)
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if read_stdin:
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read_stdin = os.close(read_stdin)
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return self._communicate(pid,
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in_data,
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write_stdin,
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read_stdout,
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read_stderr)
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finally:
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fds = [read_stdout,
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write_stdout,
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read_stderr,
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write_stderr,
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read_stdin,
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write_stdin]
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for fd in fds:
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if fd:
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os.close(fd)
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def put_file(self, in_path, out_path):
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''' transfer a file from local to lxc '''
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super(Connection, self).put_file(in_path, out_path)
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self._display.vvv("PUT %s TO %s" % (in_path, out_path), host=self.container_name)
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in_path = to_bytes(in_path, errors='surrogate_or_strict')
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out_path = to_bytes(out_path, errors='surrogate_or_strict')
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if not os.path.exists(in_path):
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msg = "file or module does not exist: %s" % in_path
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raise errors.AnsibleFileNotFound(msg)
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try:
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src_file = open(in_path, "rb")
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except IOError:
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traceback.print_exc()
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raise errors.AnsibleError("failed to open input file to %s" % in_path)
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try:
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def write_file(args):
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with open(out_path, 'wb+') as dst_file:
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shutil.copyfileobj(src_file, dst_file)
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try:
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self.container.attach_wait(write_file, None)
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except IOError:
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traceback.print_exc()
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msg = "failed to transfer file to %s" % out_path
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raise errors.AnsibleError(msg)
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finally:
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src_file.close()
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def fetch_file(self, in_path, out_path):
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''' fetch a file from lxc to local '''
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super(Connection, self).fetch_file(in_path, out_path)
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self._display.vvv("FETCH %s TO %s" % (in_path, out_path), host=self.container_name)
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in_path = to_bytes(in_path, errors='surrogate_or_strict')
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out_path = to_bytes(out_path, errors='surrogate_or_strict')
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try:
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dst_file = open(out_path, "wb")
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except IOError:
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traceback.print_exc()
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msg = "failed to open output file %s" % out_path
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raise errors.AnsibleError(msg)
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try:
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def write_file(args):
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try:
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with open(in_path, 'rb') as src_file:
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shutil.copyfileobj(src_file, dst_file)
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finally:
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# this is needed in the lxc child process
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# to flush internal python buffers
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dst_file.close()
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try:
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self.container.attach_wait(write_file, None)
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except IOError:
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traceback.print_exc()
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msg = "failed to transfer file from %s to %s" % (in_path, out_path)
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raise errors.AnsibleError(msg)
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finally:
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dst_file.close()
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def close(self):
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''' terminate the connection; nothing to do here '''
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super(Connection, self).close()
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self._connected = False
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