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# Based on the docker connection plugin
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#
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# Connection plugin for building container images using buildah tool
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# https://github.com/projectatomic/buildah
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#
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# Written by: Tomas Tomecek (https://github.com/TomasTomecek)
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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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"""
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DOCUMENTATION:
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connection: buildah
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short_description: interact with an existing buildah container
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description:
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- Run commands or put/fetch files to an existing container using buildah tool.
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author: Tomas Tomecek (ttomecek@redhat.com)
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version_added: 2.4
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options:
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remote_user:
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description:
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- User specified via name or ID which is used to execute commands inside the container.
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config:
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- section: defaults
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key: remote_user
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env_vars:
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- ANSIBLE_REMOTE_USER
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host_vars:
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- ansible_user
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"""
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from __future__ import (absolute_import, division, print_function)
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import shlex
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import shutil
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import subprocess
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import ansible.constants as C
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from ansible.module_utils._text import to_bytes
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from ansible.plugins.connection import ConnectionBase, ensure_connect
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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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__metaclass__ = type
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# this _has to be_ named Connection
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class Connection(ConnectionBase):
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"""
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This is a connection plugin for buildah: it uses buildah binary to interact with the containers
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"""
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# String used to identify this Connection class from other classes
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transport = 'buildah'
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has_pipelining = True
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become_methods = frozenset(C.BECOME_METHODS)
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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._container_id = self._play_context.remote_addr
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self._connected = False
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# container filesystem will be mounted here on host
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self._mount_point = None
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# `buildah inspect` doesn't contain info about what the default user is -- if it's not
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# set, it's empty
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self.user = self._play_context.remote_user
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def _set_user(self):
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self._buildah(b"config", [b"--user=" + to_bytes(self.user, errors='surrogate_or_strict')])
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def _buildah(self, cmd, cmd_args=None, in_data=None):
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"""
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run buildah executable
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:param cmd: buildah's command to execute (str)
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:param cmd_args: list of arguments to pass to the command (list of str/bytes)
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:param in_data: data passed to buildah's stdin
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:return: return code, stdout, stderr
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"""
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local_cmd = ['buildah', cmd, '--', self._container_id]
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if cmd_args:
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local_cmd += cmd_args
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local_cmd = [to_bytes(i, errors='surrogate_or_strict') for i in local_cmd]
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display.vvv("RUN %s" % (local_cmd,), host=self._container_id)
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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(input=in_data)
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stdout = to_bytes(stdout, errors='surrogate_or_strict')
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stderr = to_bytes(stderr, errors='surrogate_or_strict')
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return p.returncode, stdout, stderr
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def _connect(self):
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"""
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no persistent connection is being maintained, mount container's filesystem
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so we can easily access it
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"""
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super(Connection, self)._connect()
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rc, self._mount_point, stderr = self._buildah("mount")
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self._mount_point = self._mount_point.strip()
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display.vvvvv("MOUNTPOINT %s RC %s STDERR %r" % (self._mount_point, rc, stderr))
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self._connected = True
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@ensure_connect
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def exec_command(self, cmd, in_data=None, sudoable=False):
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""" run specified command in a running OCI container using buildah """
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super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
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cmd_bytes = to_bytes(cmd, errors='surrogate_or_strict')
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cmd_args_list = shlex.split(cmd_bytes)
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rc, stdout, stderr = self._buildah("run", cmd_args_list)
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display.vvvvv("STDOUT %r STDERR %r" % (stderr, stderr))
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return rc, stdout, stderr
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def put_file(self, in_path, out_path):
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""" Place a local file located in 'in_path' inside container at 'out_path' """
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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._container_id)
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real_out_path = self._mount_point + to_bytes(out_path, errors='surrogate_or_strict')
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shutil.copyfile(
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to_bytes(in_path, errors='surrogate_or_strict'),
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to_bytes(real_out_path, errors='surrogate_or_strict')
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)
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# alternatively, this can be implemented using `buildah copy`:
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# rc, stdout, stderr = self._buildah(
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# "copy",
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# [to_bytes(in_path, errors='surrogate_or_strict'),
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# to_bytes(out_path, errors='surrogate_or_strict')]
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# )
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def fetch_file(self, in_path, out_path):
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""" obtain file specified via 'in_path' from the container and place it at 'out_path' """
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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._container_id)
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real_in_path = self._mount_point + to_bytes(in_path, errors='surrogate_or_strict')
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shutil.copyfile(
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to_bytes(real_in_path, errors='surrogate_or_strict'),
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to_bytes(out_path, errors='surrogate_or_strict')
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)
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def close(self):
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""" unmount container's filesystem """
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super(Connection, self).close()
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rc, stdout, stderr = self._buildah("umount")
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display.vvvvv("RC %s STDOUT %r STDERR %r" % (rc, stdout, stderr))
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self._connected = False
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Tomas Tomecek
7 years ago
committed by