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# Based on local.py (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
# Based on chroot.py (c) 2013, Maykel Moya <mmoya@speedyrails.com>
# (c) 2013, Michael Scherer <misc@zarb.org>
# (c) 2015, Toshio Kuratomi <tkuratomi@ansible.com>
# (c) 2017 Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
DOCUMENTATION = """
author: Michael Scherer <misc@zarb.org>
connection: libvirt_lxc
short_description: Run tasks in lxc containers via libvirt
description:
- Run commands or put/fetch files to an existing lxc container using libvirt
version_added: "2.0"
options:
remote_addr:
description:
- Container identifier
default: The set user as per docker's configuration
vars:
- name: ansible_host
- name: ansible_libvirt_lxc_host
"""
import distutils.spawn
import os
import os.path
import subprocess
import traceback
from ansible import constants as C
from ansible.errors import AnsibleError
from ansible.module_utils.six.moves import shlex_quote
from ansible.module_utils._text import to_bytes
from ansible.plugins.connection import ConnectionBase, BUFSIZE
try:
from __main__ import display
except ImportError:
from ansible.utils.display import Display
display = Display()
class Connection(ConnectionBase):
''' Local lxc based connections '''
transport = 'libvirt_lxc'
has_pipelining = True
# su currently has an undiagnosed issue with calculating the file
# checksums (so copy, for instance, doesn't work right)
# Have to look into that before re-enabling this
become_methods = frozenset(C.BECOME_METHODS).difference(('su',))
default_user = 'root'
def __init__(self, play_context, new_stdin, *args, **kwargs):
super(Connection, self).__init__(play_context, new_stdin, *args, **kwargs)
self.lxc = self._play_context.remote_addr
self.virsh = self._search_executable('virsh')
self._check_domain(self.lxc)
def _search_executable(self, executable):
cmd = distutils.spawn.find_executable(executable)
if not cmd:
raise AnsibleError("%s command not found in PATH") % executable
return cmd
def _check_domain(self, domain):
p = subprocess.Popen([self.virsh, '-q', '-c', 'lxc:///', 'dominfo', to_bytes(domain)],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
p.communicate()
if p.returncode:
raise AnsibleError("%s is not a lxc defined in libvirt" % domain)
def _connect(self):
''' connect to the lxc; nothing to do here '''
super(Connection, self)._connect()
if not self._connected:
display.vvv("THIS IS A LOCAL LXC DIR", host=self.lxc)
self._connected = True
def _buffered_exec_command(self, cmd, stdin=subprocess.PIPE):
''' run a command on the chroot. This is only needed for implementing
put_file() get_file() so that we don't have to read the whole file
into memory.
compared to exec_command() it looses some niceties like being able to
return the process's exit code immediately.
'''
executable = C.DEFAULT_EXECUTABLE.split()[0] if C.DEFAULT_EXECUTABLE else '/bin/sh'
local_cmd = [self.virsh, '-q', '-c', 'lxc:///', 'lxc-enter-namespace']
if C.DEFAULT_LIBVIRT_LXC_NOSECLABEL:
local_cmd += ['--noseclabel']
local_cmd += [self.lxc, '--', executable, '-c', cmd]
display.vvv("EXEC %s" % (local_cmd,), host=self.lxc)
local_cmd = [to_bytes(i, errors='surrogate_or_strict') for i in local_cmd]
p = subprocess.Popen(local_cmd, shell=False, stdin=stdin,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
return p
def exec_command(self, cmd, in_data=None, sudoable=False):
''' run a command on the chroot '''
super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
p = self._buffered_exec_command(cmd)
stdout, stderr = p.communicate(in_data)
return (p.returncode, stdout, stderr)
def _prefix_login_path(self, remote_path):
''' Make sure that we put files into a standard path
If a path is relative, then we need to choose where to put it.
ssh chooses $HOME but we aren't guaranteed that a home dir will
exist in any given chroot. So for now we're choosing "/" instead.
This also happens to be the former default.
Can revisit using $HOME instead if it's a problem
'''
if not remote_path.startswith(os.path.sep):
remote_path = os.path.join(os.path.sep, remote_path)
return os.path.normpath(remote_path)
def put_file(self, in_path, out_path):
''' transfer a file from local to lxc '''
super(Connection, self).put_file(in_path, out_path)
display.vvv("PUT %s TO %s" % (in_path, out_path), host=self.lxc)
out_path = shlex_quote(self._prefix_login_path(out_path))
try:
with open(to_bytes(in_path, errors='surrogate_or_strict'), 'rb') as in_file:
try:
p = self._buffered_exec_command('dd of=%s bs=%s' % (out_path, BUFSIZE), stdin=in_file)
except OSError:
raise AnsibleError("chroot connection requires dd command in the chroot")
try:
stdout, stderr = p.communicate()
except:
traceback.print_exc()
raise AnsibleError("failed to transfer file %s to %s" % (in_path, out_path))
if p.returncode != 0:
raise AnsibleError("failed to transfer file %s to %s:\n%s\n%s" % (in_path, out_path, stdout, stderr))
except IOError:
raise AnsibleError("file or module does not exist at: %s" % in_path)
def fetch_file(self, in_path, out_path):
''' fetch a file from lxc to local '''
super(Connection, self).fetch_file(in_path, out_path)
display.vvv("FETCH %s TO %s" % (in_path, out_path), host=self.lxc)
in_path = shlex_quote(self._prefix_login_path(in_path))
try:
p = self._buffered_exec_command('dd if=%s bs=%s' % (in_path, BUFSIZE))
except OSError:
raise AnsibleError("chroot connection requires dd command in the chroot")
with open(to_bytes(out_path, errors='surrogate_or_strict'), 'wb+') as out_file:
try:
chunk = p.stdout.read(BUFSIZE)
while chunk:
out_file.write(chunk)
chunk = p.stdout.read(BUFSIZE)
except:
traceback.print_exc()
raise AnsibleError("failed to transfer file %s to %s" % (in_path, out_path))
stdout, stderr = p.communicate()
if p.returncode != 0:
raise AnsibleError("failed to transfer file %s to %s:\n%s\n%s" % (in_path, out_path, stdout, stderr))
def close(self):
''' terminate the connection; nothing to do here '''
super(Connection, self).close()
self._connected = False
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