update lxc plugin
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9bc1eb9898
commit
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@ -2,7 +2,6 @@ ansible-lxc
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===========
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Ansible Connection Plugin for lxc containers (https://linuxcontainers.org/)
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The plugin will use lxc-attach under the hood to connect to containers
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INSTALL
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=======
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@ -1,11 +1,10 @@
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from __future__ import absolute_import
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import distutils.spawn
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import os,sys
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import os, sys
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import subprocess
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import shutil
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import traceback
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import re
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import select
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from ansible import errors
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from ansible.callbacks import vvv
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@ -14,38 +13,15 @@ import lxc as _lxc
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class Connection(object):
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""" Local lxc based connections """
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def _search_executable(self, executable):
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cmd = distutils.spawn.find_executable(executable)
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if not cmd:
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raise errors.AnsibleError("%s command not found in PATH") % executable
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return cmd
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def _root_fs(self):
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rootfs = self.container.get_running_config_item("lxc.rootfs")
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# overlayfs use the scheme:
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# overlayfs:/var/lib/lxc/LXC-Template-1404/rootfs:/var/lib/lxc/lxc-demo/delta0
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match = re.match(r'^overlayfs:.+?rootfs:(.+)', rootfs)
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if match:
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rootfs = match.group(1)
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if not rootfs:
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raise errors.AnsibleError("rootfs not set in configuration for %s") % self.host
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return rootfs
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def __init__(self, runner, host, port, *args, **kwargs):
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self.has_pipelining = False
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self.host = host
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# port is unused, since this is local
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self.port = port
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self.runner = runner
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self.lxc_attach = self._search_executable("lxc-attach")
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self.container = _lxc.Container(host)
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if self.container.state == "STOPPED":
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raise errors.AnsibleError("%s is not running" % host)
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self.rootfs = self._root_fs()
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def connect(self, port=None):
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""" connect to the lxc; nothing to do here """
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@ -53,59 +29,86 @@ class Connection(object):
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return self
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def _generate_cmd(self, executable, cmd):
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if executable:
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return [self.lxc_attach, "--name", self.host, "--", executable, "-c", cmd]
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else:
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return "%s --name %s -- %s" % (self.lxc_attach, self.host, cmd)
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def exec_command(self, cmd, tmp_path, sudo_user=None, sudoable=False, executable="/bin/sh", in_data=None, su=None, su_user=None):
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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):
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""" run a command on the chroot """
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# We enter lxc as root so sudo stuff can be ignored
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local_cmd = self._generate_cmd(executable, cmd)
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local_cmd = [cmd]
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if executable:
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local_cmd = [executable, "-c"] + local_cmd
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if sudo_user:
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local_cmd = ["sudo", "-u", sudo_user, "--"] + local_cmd
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read_stdout, write_stdout = os.pipe()
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read_stderr, write_stderr = os.pipe()
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vvv("EXEC %s" % (local_cmd), host=self.host)
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p = subprocess.Popen(local_cmd, shell=isinstance(local_cmd, basestring),
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cwd=self.runner.basedir,
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stdin=subprocess.PIPE,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdout, stderr = p.communicate()
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return (p.returncode, "", stdout, stderr)
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def _normalize_path(self, path, prefix):
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if not path.startswith(os.path.sep):
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path = os.path.join(os.path.sep, path)
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normpath = os.path.normpath(path)
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return os.path.join(prefix, normpath[1:])
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pid = self.container.attach(_lxc.attach_run_command, local_cmd,
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stdout=write_stdout,
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stderr=write_stderr)
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os.close(write_stdout)
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os.close(write_stderr)
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fds = [read_stdout, read_stderr]
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def _copy(self, in_path, out_path):
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if not os.path.exists(in_path):
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raise errors.AnsibleFileNotFound("file or module does not exist: %s" % in_path)
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try:
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shutil.copyfile(in_path, out_path)
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except shutil.Error:
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traceback.print_exc()
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raise errors.AnsibleError("failed to copy: %s and %s are the same" % (in_path, out_path))
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except IOError:
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traceback.print_exc()
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raise errors.AnsibleError("failed to transfer file to %s" % out_path)
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buf = { read_stdout: [], read_stderr: [] }
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while len(fds) > 0:
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ready_fds, _, _ = select.select(fds, [], [])
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for fd in ready_fds:
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data = os.read(fd, 32768)
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if not data:
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fds.remove(fd)
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os.close(fd)
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buf[fd].append(data)
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(pid, returncode) = os.waitpid(pid, 0)
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stdout = b"".join(buf[read_stdout])
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stderr = b"".join(buf[read_stderr])
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return (returncode, "", stdout, stderr)
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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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out_path = self._normalize_path(out_path, self.rootfs)
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vvv("PUT %s TO %s" % (in_path, out_path), host=self.host)
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self._copy(in_path, out_path)
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if not os.path.exists(in_path):
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raise errors.AnsibleFileNotFound("file or module does not exist: %s" % in_path)
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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 file to %s" % in_path)
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def write_file(args):
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dst_file = open(out_path, 'wb')
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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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raise errors.AnsibleError("failed to transfer file to %s" % out_path)
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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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in_path = self._normalize_path(in_path, self.rootfs)
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vvv("FETCH %s TO %s" % (in_path, out_path), host=self.host)
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self._copy(in_path, out_path)
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if not os.path.exists(in_path):
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raise errors.AnsibleFileNotFound("file or module does not exist: %s" % in_path)
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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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raise errors.AnsibleError("failed to write to file %s" % out_path)
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def write_file(args):
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src_file = open(in_path, 'rb')
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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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raise errors.AnsibleError("failed to transfer file from %s to %s" % (in_path, out_path))
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def close(self):
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""" terminate the connection; nothing to do here """
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