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update lxc plugin

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This commit is contained in:
Jörg Thalheim 2015-04-09 10:30:08 +00:00
parent 9bc1eb9898
commit 5f32464f71
2 changed files with 66 additions and 64 deletions
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1
connection_plugins/lxc/README.md
View File

@ -2,7 +2,6 @@ ansible-lxc
===========
Ansible Connection Plugin for lxc containers (https://linuxcontainers.org/)
The plugin will use lxc-attach under the hood to connect to containers
INSTALL
=======

127
connection_plugins/lxc/lxc.py
View File

@ -1,11 +1,10 @@
from __future__ import absolute_import
import distutils.spawn
import os, sys
import subprocess
import shutil
import traceback
import re
import select
from ansible import errors
from ansible.callbacks import vvv
@ -14,38 +13,15 @@ import lxc as _lxc
class Connection(object):
""" Local lxc based connections """
def _search_executable(self, executable):
cmd = distutils.spawn.find_executable(executable)
if not cmd:
raise errors.AnsibleError("%s command not found in PATH") % executable
return cmd
def _root_fs(self):
rootfs = self.container.get_running_config_item("lxc.rootfs")
# overlayfs use the scheme:
# overlayfs:/var/lib/lxc/LXC-Template-1404/rootfs:/var/lib/lxc/lxc-demo/delta0
match = re.match(r'^overlayfs:.+?rootfs:(.+)', rootfs)
if match:
rootfs = match.group(1)
if not rootfs:
raise errors.AnsibleError("rootfs not set in configuration for %s") % self.host
return rootfs
def __init__(self, runner, host, port, *args, **kwargs):
self.has_pipelining = False
self.host = host
# port is unused, since this is local
self.port = port
self.runner = runner
self.lxc_attach = self._search_executable("lxc-attach")
self.container = _lxc.Container(host)
if self.container.state == "STOPPED":
raise errors.AnsibleError("%s is not running" % host)
self.rootfs = self._root_fs()
def connect(self, port=None):
""" connect to the lxc; nothing to do here """
@ -53,59 +29,86 @@ class Connection(object):
return self
def _generate_cmd(self, executable, cmd):
if executable:
return [self.lxc_attach, "--name", self.host, "--", executable, "-c", cmd]
else:
return "%s --name %s -- %s" % (self.lxc_attach, self.host, cmd)
def exec_command(self, cmd, tmp_path, sudo_user=None, sudoable=False, executable="/bin/sh", in_data=None, su=None, su_user=None):
def exec_command(self, cmd, tmp_path, sudo_user=None, become_user=None, sudoable=False, executable="/bin/sh", in_data=None, su=None, su_user=None):
""" run a command on the chroot """
# We enter lxc as root so sudo stuff can be ignored
local_cmd = self._generate_cmd(executable, cmd)
local_cmd = [cmd]
if executable:
local_cmd = [executable, "-c"] + local_cmd
if sudo_user:
local_cmd = ["sudo", "-u", sudo_user, "--"] + local_cmd
read_stdout, write_stdout = os.pipe()
read_stderr, write_stderr = os.pipe()
vvv("EXEC %s" % (local_cmd), host=self.host)
p = subprocess.Popen(local_cmd, shell=isinstance(local_cmd, basestring),
cwd=self.runner.basedir,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = p.communicate()
return (p.returncode, "", stdout, stderr)
def _normalize_path(self, path, prefix):
if not path.startswith(os.path.sep):
path = os.path.join(os.path.sep, path)
normpath = os.path.normpath(path)
return os.path.join(prefix, normpath[1:])
pid = self.container.attach(_lxc.attach_run_command, local_cmd,
stdout=write_stdout,
stderr=write_stderr)
os.close(write_stdout)
os.close(write_stderr)
fds = [read_stdout, read_stderr]
def _copy(self, in_path, out_path):
if not os.path.exists(in_path):
raise errors.AnsibleFileNotFound("file or module does not exist: %s" % in_path)
try:
shutil.copyfile(in_path, out_path)
except shutil.Error:
traceback.print_exc()
raise errors.AnsibleError("failed to copy: %s and %s are the same" % (in_path, out_path))
except IOError:
traceback.print_exc()
raise errors.AnsibleError("failed to transfer file to %s" % out_path)
buf = { read_stdout: [], read_stderr: [] }
while len(fds) > 0:
ready_fds, _, _ = select.select(fds, [], [])
for fd in ready_fds:
data = os.read(fd, 32768)
if not data:
fds.remove(fd)
os.close(fd)
buf[fd].append(data)
(pid, returncode) = os.waitpid(pid, 0)
stdout = b"".join(buf[read_stdout])
stderr = b"".join(buf[read_stderr])
return (returncode, "", stdout, stderr)
def put_file(self, in_path, out_path):
""" transfer a file from local to lxc """
out_path = self._normalize_path(out_path, self.rootfs)
vvv("PUT %s TO %s" % (in_path, out_path), host=self.host)
self._copy(in_path, out_path)
if not os.path.exists(in_path):
raise errors.AnsibleFileNotFound("file or module does not exist: %s" % in_path)
try:
src_file = open(in_path, "rb")
except IOError:
traceback.print_exc()
raise errors.AnsibleError("failed to open file to %s" % in_path)
def write_file(args):
dst_file = open(out_path, 'wb')
shutil.copyfileobj(src_file, dst_file)
try:
self.container.attach_wait(write_file, None)
except IOError:
traceback.print_exc()
raise errors.AnsibleError("failed to transfer file to %s" % out_path)
def fetch_file(self, in_path, out_path):
""" fetch a file from lxc to local """
in_path = self._normalize_path(in_path, self.rootfs)
vvv("FETCH %s TO %s" % (in_path, out_path), host=self.host)
self._copy(in_path, out_path)
if not os.path.exists(in_path):
raise errors.AnsibleFileNotFound("file or module does not exist: %s" % in_path)
try:
dst_file = open(out_path, "wb")
except IOError:
traceback.print_exc()
raise errors.AnsibleError("failed to write to file %s" % out_path)
def write_file(args):
src_file = open(in_path, 'rb')
shutil.copyfileobj(src_file, dst_file)
try:
self.container.attach_wait(write_file, None)
except IOError:
traceback.print_exc()
raise errors.AnsibleError("failed to transfer file from %s to %s" % (in_path, out_path))
def close(self):
""" terminate the connection; nothing to do here """