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community.general/plugins/connection/chroot.py
patchback[bot] f3828ebdd7
[PR #6824/59479b4a backport][stable-6] chroot: added an example (#6898) 
chroot: added an example (#6824)

* chroot: added an example

Added a simple example of chroot connection plugin

Fixes: #6365

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

* Apply suggestions from code review

Co-authored-by: Felix Fontein <felix@fontein.de>

---------

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>
Co-authored-by: Felix Fontein <felix@fontein.de>
(cherry picked from commit 59479b4abd)

Co-authored-by: Abhijeet Kasurde <akasurde@redhat.com>
2023-07-08 18:09:04 +02:00

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# -*- coding: utf-8 -*-
# Based on local.py (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
#
# (c) 2013, Maykel Moya <mmoya@speedyrails.com>
# (c) 2015, Toshio Kuratomi <tkuratomi@ansible.com>
# Copyright (c) 2017 Ansible Project
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
DOCUMENTATION = '''
author: Maykel Moya (!UNKNOWN) <mmoya@speedyrails.com>
name: chroot
short_description: Interact with local chroot
description:
- Run commands or put/fetch files to an existing chroot on the Ansible controller.
options:
remote_addr:
description:
- The path of the chroot you want to access.
default: inventory_hostname
vars:
- name: inventory_hostname
- name: ansible_host
executable:
description:
- User specified executable shell
ini:
- section: defaults
key: executable
env:
- name: ANSIBLE_EXECUTABLE
vars:
- name: ansible_executable
default: /bin/sh
chroot_exe:
description:
- User specified chroot binary
ini:
- section: chroot_connection
key: exe
env:
- name: ANSIBLE_CHROOT_EXE
vars:
- name: ansible_chroot_exe
default: chroot
'''
EXAMPLES = r"""
# Static inventory file
#
# [chroots]
# /path/to/debootstrap
# /path/to/feboostrap
# /path/to/lxc-image
# /path/to/chroot
# playbook
---
- hosts: chroots
connection: community.general.chroot
tasks:
- debug:
msg: "This is coming from chroot environment"
"""
import os
import os.path
import subprocess
import traceback
from ansible.errors import AnsibleError
from ansible.module_utils.basic import is_executable
from ansible.module_utils.common.process import get_bin_path
from ansible.module_utils.six.moves import shlex_quote
from ansible.module_utils.common.text.converters import to_bytes, to_native
from ansible.plugins.connection import ConnectionBase, BUFSIZE
from ansible.utils.display import Display
display = Display()
class Connection(ConnectionBase):
""" Local chroot based connections """
transport = 'community.general.chroot'
has_pipelining = True
# su currently has an undiagnosed issue with calculating the file
# checksums (so copy, for instance, doesn't work right)
# Have to look into that before re-enabling this
has_tty = False
default_user = 'root'
def __init__(self, play_context, new_stdin, *args, **kwargs):
super(Connection, self).__init__(play_context, new_stdin, *args, **kwargs)
self.chroot = self._play_context.remote_addr
if os.geteuid() != 0:
raise AnsibleError("chroot connection requires running as root")
# we're running as root on the local system so do some
# trivial checks for ensuring 'host' is actually a chroot'able dir
if not os.path.isdir(self.chroot):
raise AnsibleError("%s is not a directory" % self.chroot)
chrootsh = os.path.join(self.chroot, 'bin/sh')
# Want to check for a usable bourne shell inside the chroot.
# is_executable() == True is sufficient. For symlinks it
# gets really complicated really fast. So we punt on finding that
# out. As long as it's a symlink we assume that it will work
if not (is_executable(chrootsh) or (os.path.lexists(chrootsh) and os.path.islink(chrootsh))):
raise AnsibleError("%s does not look like a chrootable dir (/bin/sh missing)" % self.chroot)
def _connect(self):
""" connect to the chroot """
if os.path.isabs(self.get_option('chroot_exe')):
self.chroot_cmd = self.get_option('chroot_exe')
else:
try:
self.chroot_cmd = get_bin_path(self.get_option('chroot_exe'))
except ValueError as e:
raise AnsibleError(to_native(e))
super(Connection, self)._connect()
if not self._connected:
display.vvv("THIS IS A LOCAL CHROOT DIR", host=self.chroot)
self._connected = True
def _buffered_exec_command(self, cmd, stdin=subprocess.PIPE):
""" run a command on the chroot. This is only needed for implementing
put_file() get_file() so that we don't have to read the whole file
into memory.
compared to exec_command() it looses some niceties like being able to
return the process's exit code immediately.
"""
executable = self.get_option('executable')
local_cmd = [self.chroot_cmd, self.chroot, executable, '-c', cmd]
display.vvv("EXEC %s" % local_cmd, host=self.chroot)
local_cmd = [to_bytes(i, errors='surrogate_or_strict') for i in local_cmd]
p = subprocess.Popen(local_cmd, shell=False, stdin=stdin,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
return p
def exec_command(self, cmd, in_data=None, sudoable=False):
""" run a command on the chroot """
super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
p = self._buffered_exec_command(cmd)
stdout, stderr = p.communicate(in_data)
return p.returncode, stdout, stderr
@staticmethod
def _prefix_login_path(remote_path):
""" Make sure that we put files into a standard path
If a path is relative, then we need to choose where to put it.
ssh chooses $HOME but we aren't guaranteed that a home dir will
exist in any given chroot. So for now we're choosing "/" instead.
This also happens to be the former default.
Can revisit using $HOME instead if it's a problem
"""
if not remote_path.startswith(os.path.sep):
remote_path = os.path.join(os.path.sep, remote_path)
return os.path.normpath(remote_path)
def put_file(self, in_path, out_path):
""" transfer a file from local to chroot """
super(Connection, self).put_file(in_path, out_path)
display.vvv("PUT %s TO %s" % (in_path, out_path), host=self.chroot)
out_path = shlex_quote(self._prefix_login_path(out_path))
try:
with open(to_bytes(in_path, errors='surrogate_or_strict'), 'rb') as in_file:
if not os.fstat(in_file.fileno()).st_size:
count = ' count=0'
else:
count = ''
try:
p = self._buffered_exec_command('dd of=%s bs=%s%s' % (out_path, BUFSIZE, count), stdin=in_file)
except OSError:
raise AnsibleError("chroot connection requires dd command in the chroot")
try:
stdout, stderr = p.communicate()
except Exception:
traceback.print_exc()
raise AnsibleError("failed to transfer file %s to %s" % (in_path, out_path))
if p.returncode != 0:
raise AnsibleError("failed to transfer file %s to %s:\n%s\n%s" % (in_path, out_path, stdout, stderr))
except IOError:
raise AnsibleError("file or module does not exist at: %s" % in_path)
def fetch_file(self, in_path, out_path):
""" fetch a file from chroot to local """
super(Connection, self).fetch_file(in_path, out_path)
display.vvv("FETCH %s TO %s" % (in_path, out_path), host=self.chroot)
in_path = shlex_quote(self._prefix_login_path(in_path))
try:
p = self._buffered_exec_command('dd if=%s bs=%s' % (in_path, BUFSIZE))
except OSError:
raise AnsibleError("chroot connection requires dd command in the chroot")
with open(to_bytes(out_path, errors='surrogate_or_strict'), 'wb+') as out_file:
try:
chunk = p.stdout.read(BUFSIZE)
while chunk:
out_file.write(chunk)
chunk = p.stdout.read(BUFSIZE)
except Exception:
traceback.print_exc()
raise AnsibleError("failed to transfer file %s to %s" % (in_path, out_path))
stdout, stderr = p.communicate()
if p.returncode != 0:
raise AnsibleError("failed to transfer file %s to %s:\n%s\n%s" % (in_path, out_path, stdout, stderr))
def close(self):
""" terminate the connection; nothing to do here """
super(Connection, self).close()
self._connected = False
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