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https://github.com/ansible-collections/community.general.git
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10a4a4e986
This is because we pass the whole dd command string into the shell that's running on the contained environment rather than running it directly from python via subprocess without a shell.
165 lines
6.7 KiB
Python
165 lines
6.7 KiB
Python
# Based on local.py (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
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# (c) 2013, Maykel Moya <mmoya@speedyrails.com>
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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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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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from __future__ import (absolute_import, division, print_function)
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__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 pipes
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import subprocess
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import traceback
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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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from ansible.module_utils.basic import is_executable
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BUFSIZE = 65536
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class Connection(ConnectionBase):
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''' Local chroot based connections '''
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transport = 'chroot'
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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.chroot = self._play_context.remote_addr
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if os.geteuid() != 0:
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raise AnsibleError("chroot connection requires running as root")
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# we're running as root on the local system so do some
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# trivial checks for ensuring 'host' is actually a chroot'able dir
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if not os.path.isdir(self.chroot):
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raise AnsibleError("%s is not a directory" % self.chroot)
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chrootsh = os.path.join(self.chroot, 'bin/sh')
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if not is_executable(chrootsh):
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raise AnsibleError("%s does not look like a chrootable dir (/bin/sh missing)" % self.chroot)
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self.chroot_cmd = distutils.spawn.find_executable('chroot')
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if not self.chroot_cmd:
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raise AnsibleError("chroot command not found in PATH")
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def _connect(self):
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''' connect to the chroot; 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 CHROOT DIR", host=self.chroot)
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self._connected = True
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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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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.chroot_cmd, self.chroot, executable, '-c', cmd]
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self._display.vvv("EXEC %s" % (local_cmd), host=self.chroot)
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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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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 _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 chroot '''
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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.chroot)
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out_path = pipes.quote(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 chroot 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.chroot)
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in_path = pipes.quote(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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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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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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super(Connection, self).close()
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self._connected = False
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