mirror of
https://github.com/thegeeklab/ansible-later.git
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353 lines
13 KiB
Python
353 lines
13 KiB
Python
# Based on the docker connection plugin
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#
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# Connection plugin for configuring kubernetes containers with kubectl
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# (c) 2017, XuXinkun <xuxinkun@gmail.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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DOCUMENTATION = """
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author:
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- xuxinkun
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connection: kubectl
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short_description: Execute tasks in pods running on Kubernetes.
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description:
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- Use the kubectl exec command to run tasks in, or put/fetch files to, pods running on the Kubernetes
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container platform.
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version_added: "2.5"
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requirements:
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- kubectl (go binary)
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options:
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kubectl_pod:
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description:
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- Pod name. Required when the host name does not match pod name.
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default: ''
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vars:
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- name: ansible_kubectl_pod
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env:
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- name: K8S_AUTH_POD
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kubectl_container:
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description:
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- Container name. Required when a pod contains more than one container.
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default: ''
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vars:
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- name: ansible_kubectl_container
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env:
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- name: K8S_AUTH_CONTAINER
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kubectl_namespace:
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description:
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- The namespace of the pod
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default: ''
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vars:
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- name: ansible_kubectl_namespace
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env:
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- name: K8S_AUTH_NAMESPACE
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kubectl_extra_args:
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description:
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- Extra arguments to pass to the kubectl command line.
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default: ''
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vars:
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- name: ansible_kubectl_extra_args
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env:
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- name: K8S_AUTH_EXTRA_ARGS
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kubectl_kubeconfig:
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description:
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- Path to a kubectl config file. Defaults to I(~/.kube/conig)
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default: ''
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vars:
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- name: ansible_kubectl_kubeconfig
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- name: ansible_kubectl_config
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env:
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- name: K8S_AUTH_KUBECONFIG
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kubectl_context:
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description:
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- The name of a context found in the K8s config file.
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default: ''
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vars:
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- name: ansible_kubectl_context
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env:
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- name: k8S_AUTH_CONTEXT
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kubectl_host:
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description:
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- URL for accessing the API.
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default: ''
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vars:
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- name: ansible_kubectl_host
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- name: ansible_kubectl_server
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env:
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- name: K8S_AUTH_HOST
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- name: K8S_AUTH_SERVER
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kubectl_username:
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description:
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- Provide a username for authenticating with the API.
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default: ''
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vars:
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- name: ansible_kubectl_username
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env:
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- name: K8S_AUTH_USERNAME
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kubectl_password:
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description:
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- Provide a password for authenticating with the API.
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default: ''
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vars:
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- name: ansible_kubectl_password
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env:
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- name: K8S_AUTH_PASSWORD
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kubectl_token:
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description:
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- API authentication bearer token.
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vars:
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- name: ansible_kubectl_token
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- name: ansible_kubectl_api_key
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env:
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- name: K8S_AUTH_TOKEN
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- name: K8S_AUTH_API_KEY
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kubectl_cert_file:
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description:
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- Path to a certificate used to authenticate with the API.
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default: ''
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vars:
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- name: ansible_kubectl_cert_file
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env:
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- name: K8S_AUTH_CERT_FILE
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kubectl_key_file:
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description:
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- Path to a key file used to authenticate with the API.
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default: ''
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vars:
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- name: ansible_kubectl_key_file
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env:
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- name: K8S_AUTH_KEY_FILE
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kubectl_ssl_ca_cert:
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description:
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- Path to a CA certificate used to authenticate with the API.
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default: ''
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vars:
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- name: ansible_kubectl_cert_file
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env:
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- name: K8S_AUTH_SSL_CA_CERT
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kubectl_verify_ssl:
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description:
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- Whether or not to verify the API server's SSL certificate. Defaults to I(true).
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default: ''
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vars:
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- name: ansible_kubectl_verify_ssl
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env:
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- name: K8s_AUTH_VERIFY_SSL
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"""
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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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import ansible.constants as C
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from ansible.parsing.yaml.loader import AnsibleLoader
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from ansible.errors import AnsibleError, AnsibleFileNotFound
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from ansible.module_utils.six.moves import shlex_quote
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from ansible.module_utils._text import to_bytes
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from ansible.plugins.connection import ConnectionBase, BUFSIZE
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try:
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from __main__ import display
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except ImportError:
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from ansible.utils.display import Display
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display = Display()
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CONNECTION_TRANSPORT = 'kubectl'
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CONNECTION_OPTIONS = {
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'kubectl_container': '-c',
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'kubectl_namespace': '-n',
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'kubectl_kubeconfig': '--kubeconfig',
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'kubectl_context': '--context',
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'kubectl_host': '--server',
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'kubectl_username': '--username',
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'kubectl_password': '--password',
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'kubectl_cert_file': '--client-certificate',
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'kubectl_key_file': '--client-key',
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'kubectl_ssl_ca_cert': '--certificate-authority',
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'kubectl_verify_ssl': '--insecure-skip-tls-verify',
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'kubectl_token': '--token'
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}
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class Connection(ConnectionBase):
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''' Local kubectl based connections '''
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transport = CONNECTION_TRANSPORT
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connection_options = CONNECTION_OPTIONS
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documentation = DOCUMENTATION
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has_pipelining = True
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become_methods = frozenset(C.BECOME_METHODS)
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transport_cmd = None
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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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# Note: kubectl runs commands as the user that started the container.
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# It is impossible to set the remote user for a kubectl connection.
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cmd_arg = '{0}_command'.format(self.transport)
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if cmd_arg in kwargs:
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self.transport_cmd = kwargs[cmd_arg]
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else:
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self.transport_cmd = distutils.spawn.find_executable(self.transport)
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if not self.transport_cmd:
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raise AnsibleError("{0} command not found in PATH".format(self.transport))
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def _build_exec_cmd(self, cmd):
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""" Build the local kubectl exec command to run cmd on remote_host
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"""
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local_cmd = [self.transport_cmd]
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# Build command options based on doc string
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doc_yaml = AnsibleLoader(self.documentation).get_single_data()
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for key in doc_yaml.get('options'):
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if key.endswith('verify_ssl') and self.get_option(key) != '':
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# Translate verify_ssl to skip_verify_ssl, and output as string
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skip_verify_ssl = not self.get_option(key)
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local_cmd.append(u'{0}={1}'.format(self.connection_options[key], str(skip_verify_ssl).lower()))
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elif not key.endswith('container') and self.get_option(key) and self.connection_options.get(key):
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cmd_arg = self.connection_options[key]
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local_cmd += [cmd_arg, self.get_option(key)]
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extra_args_name = u'{0}_extra_args'.format(self.transport)
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if self.get_option(extra_args_name):
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local_cmd += self.get_option(extra_args_name).split(' ')
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pod = self.get_option(u'{0}_pod'.format(self.transport))
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if not pod:
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pod = self._play_context.remote_addr
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# -i is needed to keep stdin open which allows pipelining to work
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local_cmd += ['exec', '-i', pod]
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# if the pod has more than one container, then container is required
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container_arg_name = u'{0}_container'.format(self.transport)
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if self.get_option(container_arg_name):
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local_cmd += ['-c', self.get_option(container_arg_name)]
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local_cmd += ['--'] + cmd
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return local_cmd
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def _connect(self, port=None):
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""" Connect to the container. Nothing to do """
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super(Connection, self)._connect()
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if not self._connected:
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display.vvv(u"ESTABLISH {0} CONNECTION".format(self.transport), host=self._play_context.remote_addr)
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self._connected = True
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def exec_command(self, cmd, in_data=None, sudoable=False):
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""" Run a command in the container """
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super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
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local_cmd = self._build_exec_cmd([self._play_context.executable, '-c', cmd])
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display.vvv("EXEC %s" % (local_cmd,), host=self._play_context.remote_addr)
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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=subprocess.PIPE,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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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 the container """
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super(Connection, self).put_file(in_path, out_path)
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display.vvv("PUT %s TO %s" % (in_path, out_path), host=self._play_context.remote_addr)
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out_path = self._prefix_login_path(out_path)
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if not os.path.exists(to_bytes(in_path, errors='surrogate_or_strict')):
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raise AnsibleFileNotFound(
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"file or module does not exist: %s" % in_path)
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out_path = shlex_quote(out_path)
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# kubectl doesn't have native support for copying files into
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# running containers, so we use kubectl exec to implement this
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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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args = self._build_exec_cmd([self._play_context.executable, "-c", "dd of=%s bs=%s%s" % (out_path, BUFSIZE, count)])
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args = [to_bytes(i, errors='surrogate_or_strict') for i in args]
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try:
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p = subprocess.Popen(args, stdin=in_file,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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except OSError:
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raise AnsibleError("kubectl connection requires dd command in the container to put files")
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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 fetch_file(self, in_path, out_path):
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""" Fetch a file from container to local. """
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super(Connection, self).fetch_file(in_path, out_path)
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display.vvv("FETCH %s TO %s" % (in_path, out_path), host=self._play_context.remote_addr)
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in_path = self._prefix_login_path(in_path)
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out_dir = os.path.dirname(out_path)
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# kubectl doesn't have native support for fetching files from
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# running containers, so we use kubectl exec to implement this
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args = self._build_exec_cmd([self._play_context.executable, "-c", "dd if=%s bs=%s" % (in_path, BUFSIZE)])
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args = [to_bytes(i, errors='surrogate_or_strict') for i in args]
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actual_out_path = os.path.join(out_dir, os.path.basename(in_path))
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with open(to_bytes(actual_out_path, errors='surrogate_or_strict'), 'wb') as out_file:
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try:
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p = subprocess.Popen(args, stdin=subprocess.PIPE,
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stdout=out_file, stderr=subprocess.PIPE)
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except OSError:
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raise AnsibleError(
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"{0} connection requires dd command in the container to fetch files".format(self.transport)
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)
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stdout, stderr = p.communicate()
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if p.returncode != 0:
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raise AnsibleError("failed to fetch file %s to %s:\n%s\n%s" % (in_path, out_path, stdout, stderr))
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if actual_out_path != out_path:
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os.rename(to_bytes(actual_out_path, errors='strict'), to_bytes(out_path, errors='strict'))
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def close(self):
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""" Terminate the connection. Nothing to do for kubectl"""
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super(Connection, self).close()
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self._connected = False
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