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Port libvirt_lxc connection plugin to v2
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parent
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commit
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1 changed files with 104 additions and 72 deletions
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@ -1,6 +1,7 @@
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# Based on local.py (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
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# Based on chroot.py (c) 2013, Maykel Moya <mmoya@speedyrails.com>
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# (c) 2013, Michael Scherer <misc@zarb.org>
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# (c) 2015, Toshio Kuratomi <tkuratomi@ansible.com>
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#
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# This file is part of Ansible
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#
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@ -21,111 +22,142 @@ __metaclass__ = type
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import distutils.spawn
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import os
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import os.path
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import subprocess
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from ansible import errors
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from ansible.callbacks import vvv
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import ansible.constants as C
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class Connection(object):
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from ansible import constants as C
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from ansible.errors import AnsibleError
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from ansible.plugins.connection import ConnectionBase
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BUFSIZE = 65536
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class Connection(ConnectionBase):
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''' Local lxc based connections '''
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transport = 'libvirt_lxc'
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has_pipelining = True
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# su currently has an undiagnosed issue with calculating the file
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# checksums (so copy, for instance, doesn't work right)
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# Have to look into that before re-enabling this
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become_methods = frozenset(C.BECOME_METHODS).difference(('su',))
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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.lxc = self._play_context.remote_addr
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self.virsh = self._search_executable('virsh')
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self._check_domain(self.lxc)
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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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raise AnsibleError("%s command not found in PATH") % executable
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return cmd
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def _check_domain(self, domain):
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p = subprocess.Popen([self.cmd, '-q', '-c', 'lxc:///', 'dominfo', domain],
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p = subprocess.Popen([self.virsh, '-q', '-c', 'lxc:///', 'dominfo', domain],
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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p.communicate()
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if p.returncode:
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raise errors.AnsibleError("%s is not a lxc defined in libvirt" % domain)
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raise AnsibleError("%s is not a lxc defined in libvirt" % domain)
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def __init__(self, runner, host, port, *args, **kwargs):
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self.lxc = host
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self.cmd = self._search_executable('virsh')
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self._check_domain(host)
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self.runner = runner
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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.become_methods_supported=C.BECOME_METHODS
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def connect(self, port=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 self._connected:
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self._display.vvv("THIS IS A LOCAL LXC DIR", host=self.lxc)
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self._connected = True
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vvv("THIS IS A LOCAL LXC DIR", host=self.lxc)
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def _buffered_exec_command(self, cmd, stdin=subprocess.PIPE):
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''' run a command on the chroot. This is only needed for implementing
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put_file() get_file() so that we don't have to read the whole file
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into memory.
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return self
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compared to exec_command() it looses some niceties like being able to
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return the process's exit code immediately.
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'''
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executable = C.DEFAULT_EXECUTABLE.split()[0] if C.DEFAULT_EXECUTABLE else '/bin/sh'
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local_cmd = [self.virsh, '-q', '-c', 'lxc:///', 'lxc-enter-namespace', self.lxc, '--', executable , '-c', cmd]
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def _generate_cmd(self, executable, cmd):
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if executable:
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local_cmd = [self.cmd, '-q', '-c', 'lxc:///', 'lxc-enter-namespace', self.lxc, '--', executable , '-c', cmd]
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else:
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local_cmd = '%s -q -c lxc:/// lxc-enter-namespace %s -- %s' % (self.cmd, self.lxc, cmd)
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return local_cmd
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def exec_command(self, cmd, become_user, sudoable=False, executable='/bin/sh', in_data=None):
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''' run a command on the chroot '''
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if sudoable and self.runner.become and self.runner.become_method not in self.become_methods_supported:
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raise errors.AnsibleError("Internal Error: this module does not support running commands via %s" % self.runner.become_method)
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if in_data:
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raise errors.AnsibleError("Internal Error: this module does not support optimized module pipelining")
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# We ignore privilege escalation!
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local_cmd = self._generate_cmd(executable, cmd)
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vvv("EXEC %s" % (local_cmd), host=self.lxc)
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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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self._display.vvv("EXEC %s" % (local_cmd), host=self.lxc)
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p = subprocess.Popen(local_cmd, shell=False, stdin=stdin,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdout, stderr = p.communicate()
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return p
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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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p = self._buffered_exec_command(cmd)
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stdout, stderr = p.communicate(in_data)
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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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def _prefix_login_path(self, remote_path):
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''' Make sure that we put files into a standard path
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If a path is relative, then we need to choose where to put it.
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ssh chooses $HOME but we aren't guaranteed that a home dir will
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exist in any given chroot. So for now we're choosing "/" instead.
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This also happens to be the former default.
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Can revisit using $HOME instead if it's a problem
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'''
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if not remote_path.startswith(os.path.sep):
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remote_path = os.path.join(os.path.sep, remote_path)
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return os.path.normpath(remote_path)
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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.lxc)
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out_path = self._normalize_path(out_path, '/')
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vvv("PUT %s TO %s" % (in_path, out_path), host=self.lxc)
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local_cmd = [self.cmd, '-q', '-c', 'lxc:///', 'lxc-enter-namespace', self.lxc, '--', '/bin/tee', out_path]
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vvv("EXEC %s" % (local_cmd), host=self.lxc)
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p = subprocess.Popen(local_cmd, 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(open(in_path,'rb').read())
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out_path = self._prefix_login_path(out_path)
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try:
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with open(in_path, 'rb') as in_file:
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try:
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p = self._buffered_exec_command('dd of=%s bs=%s' % (out_path, BUFSIZE), stdin=in_file)
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except OSError:
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raise AnsibleError("chroot connection requires dd command in the chroot")
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try:
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stdout, stderr = p.communicate()
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except:
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traceback.print_exc()
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raise AnsibleError("failed to transfer file %s to %s" % (in_path, out_path))
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if p.returncode != 0:
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raise AnsibleError("failed to transfer file %s to %s:\n%s\n%s" % (in_path, out_path, stdout, stderr))
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except IOError:
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raise AnsibleError("file or module does not exist at: %s" % in_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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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.lxc)
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in_path = self._normalize_path(in_path, '/')
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vvv("FETCH %s TO %s" % (in_path, out_path), host=self.lxc)
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in_path = self._prefix_login_path(in_path)
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try:
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p = self._buffered_exec_command('dd if=%s bs=%s' % (in_path, BUFSIZE))
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except OSError:
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raise AnsibleError("chroot connection requires dd command in the chroot")
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local_cmd = [self.cmd, '-q', '-c', 'lxc:///', 'lxc-enter-namespace', self.lxc, '--', '/bin/cat', in_path]
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vvv("EXEC %s" % (local_cmd), host=self.lxc)
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p = subprocess.Popen(local_cmd, 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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with open(out_path, 'wb+') as out_file:
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try:
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chunk = p.stdout.read(BUFSIZE)
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while chunk:
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out_file.write(chunk)
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chunk = p.stdout.read(BUFSIZE)
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except:
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traceback.print_exc()
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raise AnsibleError("failed to transfer file %s to %s" % (in_path, out_path))
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stdout, stderr = p.communicate()
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open(out_path,'wb').write(stdout)
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if p.returncode != 0:
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raise AnsibleError("failed to transfer file %s to %s:\n%s\n%s" % (in_path, out_path, stdout, stderr))
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def close(self):
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''' terminate the connection; nothing to do here '''
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pass
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super(Connection, self).close()
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self._connected = False
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