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236 lines
8.7 KiB
236 lines
8.7 KiB
# -*- coding: utf-8 -*-
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# Based on local.py (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
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#
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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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# Copyright (c) 2017 Ansible Project
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# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
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# SPDX-License-Identifier: GPL-3.0-or-later
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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DOCUMENTATION = r"""
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author: Maykel Moya (!UNKNOWN) <mmoya@speedyrails.com>
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name: chroot
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short_description: Interact with local chroot
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description:
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- Run commands or put/fetch files to an existing chroot on the Ansible controller.
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options:
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remote_addr:
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description:
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- The path of the chroot you want to access.
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type: string
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default: inventory_hostname
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vars:
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- name: inventory_hostname
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- name: ansible_host
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executable:
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description:
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- User specified executable shell.
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type: string
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ini:
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- section: defaults
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key: executable
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env:
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- name: ANSIBLE_EXECUTABLE
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vars:
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- name: ansible_executable
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default: /bin/sh
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chroot_exe:
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description:
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- User specified chroot binary.
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type: string
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ini:
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- section: chroot_connection
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key: exe
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env:
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- name: ANSIBLE_CHROOT_EXE
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vars:
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- name: ansible_chroot_exe
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default: chroot
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disable_root_check:
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description:
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- Do not check that the user is not root.
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ini:
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- section: chroot_connection
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key: disable_root_check
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env:
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- name: ANSIBLE_CHROOT_DISABLE_ROOT_CHECK
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vars:
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- name: ansible_chroot_disable_root_check
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default: false
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type: bool
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version_added: 7.3.0
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"""
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EXAMPLES = r"""
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- hosts: chroots
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connection: community.general.chroot
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tasks:
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- debug:
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msg: "This is coming from chroot environment"
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"""
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import os
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import os.path
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import subprocess
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import traceback
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from ansible.errors import AnsibleError
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from ansible.module_utils.basic import is_executable
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from ansible.module_utils.common.process import get_bin_path
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from ansible.module_utils.six.moves import shlex_quote
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from ansible.module_utils.common.text.converters import to_bytes
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from ansible.plugins.connection import ConnectionBase, BUFSIZE
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from ansible.utils.display import Display
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display = Display()
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class Connection(ConnectionBase):
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""" Local chroot based connections """
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transport = 'community.general.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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has_tty = False
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default_user = 'root'
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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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# do some 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(f"{self.chroot} is not a directory")
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chrootsh = os.path.join(self.chroot, 'bin/sh')
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# Want to check for a usable bourne shell inside the chroot.
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# is_executable() == True is sufficient. For symlinks it
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# gets really complicated really fast. So we punt on finding that
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# out. As long as it is a symlink we assume that it will work
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if not (is_executable(chrootsh) or (os.path.lexists(chrootsh) and os.path.islink(chrootsh))):
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raise AnsibleError(f"{self.chroot} does not look like a chrootable dir (/bin/sh missing)")
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def _connect(self):
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""" connect to the chroot """
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if not self.get_option('disable_root_check') and os.geteuid() != 0:
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raise AnsibleError(
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"chroot connection requires running as root. "
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"You can override this check with the `disable_root_check` option.")
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if os.path.isabs(self.get_option('chroot_exe')):
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self.chroot_cmd = self.get_option('chroot_exe')
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else:
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try:
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self.chroot_cmd = get_bin_path(self.get_option('chroot_exe'))
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except ValueError as e:
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raise AnsibleError(str(e))
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super(Connection, self)._connect()
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if not self._connected:
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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 = self.get_option('executable')
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local_cmd = [self.chroot_cmd, self.chroot, executable, '-c', cmd]
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display.vvv(f"EXEC {local_cmd}", host=self.chroot)
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local_cmd = [to_bytes(i, errors='surrogate_or_strict') for i in local_cmd]
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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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@staticmethod
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def _prefix_login_path(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 is 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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display.vvv(f"PUT {in_path} TO {out_path}", host=self.chroot)
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out_path = shlex_quote(self._prefix_login_path(out_path))
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try:
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with open(to_bytes(in_path, errors='surrogate_or_strict'), 'rb') as in_file:
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if not os.fstat(in_file.fileno()).st_size:
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count = ' count=0'
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else:
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count = ''
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try:
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p = self._buffered_exec_command(f'dd of={out_path} bs={BUFSIZE}{count}', 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 Exception:
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traceback.print_exc()
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raise AnsibleError(f"failed to transfer file {in_path} to {out_path}")
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if p.returncode != 0:
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raise AnsibleError(f"failed to transfer file {in_path} to {out_path}:\n{stdout}\n{stderr}")
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except IOError:
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raise AnsibleError(f"file or module does not exist at: {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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display.vvv(f"FETCH {in_path} TO {out_path}", host=self.chroot)
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in_path = shlex_quote(self._prefix_login_path(in_path))
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try:
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p = self._buffered_exec_command(f'dd if={in_path} bs={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(to_bytes(out_path, errors='surrogate_or_strict'), '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 Exception:
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traceback.print_exc()
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raise AnsibleError(f"failed to transfer file {in_path} to {out_path}")
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stdout, stderr = p.communicate()
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if p.returncode != 0:
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raise AnsibleError(f"failed to transfer file {in_path} to {out_path}:\n{stdout}\n{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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