ansible/pip

#!/usr/bin/python
# -*- coding: utf-8 -*-

# (c) 2012, Matt Wright <matt@nobien.net>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
#

DOCUMENTATION = '''
---
module: pip
short_description: Manages Python library dependencies.
description:
     - Manage Python library dependencies.
version_added: "0.7"
options:
  name:
    description:
      - The name of a Python library to install
    required: true
    default: null
  version:
    description:
      - The version number to install of the Python library specified in the I(name) parameter
    required: false
    default: null
  requirements:
    description:
      - The path to a pip requirements file
    required: false
    default: null
  virtualenv:
    description:
      - An optional path to a I(virtualenv) directory to install into
    required: false
    default: null
  use_mirrors:
    description:
      - Whether to use mirrors when installing python libraries.  If using
        an older version of pip (< 1.0), you should set this to no because
        older versions of pip do not support I(--use-mirrors).
    required: false
    default: yes
    choices: [ "yes", "no" ]
    version_added: "1.0"
  state:
    description:
      - The state of module
    required: false
    default: present
    choices: [ "present", "absent", "latest" ]
  extra_args:
    description:
      - Extra arguments passed to pip.
    required: false
    default: null
    version_added: "1.0"
examples:
   - code: "pip: name=flask"
     description: Install I(flask) python package.
   - code: "pip: name=flask version=0.8"
     description: Install I(flask) python package on version 0.8.
   - code: "pip: name=flask virtualenv=/my_app/venv"
     description: "Install I(Flask) (U(http://flask.pocoo.org/)) into the specified I(virtualenv)"
   - code: "pip: requirements=/my_app/requirements.txt"
     description: Install specified python requirements.
   - code: "pip: requirements=/my_app/requirements.txt virtualenv=/my_app/venv"
     description: Install specified python requirements in indicated I(virtualenv).
   - code: "pip: requirements=/my_app/requirements.txt extra_args='-i https://example.com/pypi/simple'"
     description: Install specified python requirements and custom Index URL.
notes:
   - Please note that U(http://www.virtualenv.org/, virtualenv) must be installed on the remote host if the virtualenv parameter is specified.
requirements: [ "virtualenv", "pip" ]
author: Matt Wright
'''


def _get_full_name(name, version=None):
    if version is None:
        resp = name
    else:
        resp = name + '==' + version
    return resp


def _get_pip(module, env):
    # On Debian and Ubuntu, pip is pip.
    # On Fedora18 and up, pip is python-pip.
    # On Fedora17 and below, CentOS and RedHat 6 and 5, pip is pip-python.
    # On Fedora, CentOS, and RedHat, the exception is in the virtualenv.
    # There, pip is just pip.
    # Try pip with the virtualenv directory first.
    pip = module.get_bin_path('pip', False, ['%s/bin' % env])
    for p in ['python-pip', 'pip-python']:
        if not pip:
            pip = module.get_bin_path(p, False, ['%s/bin' % env])
    # pip should have been found by now.  The final call to get_bin_path
    # will trigger fail_json.
    if not pip:
        pip = module.get_bin_path('pip', True, ['%s/bin' % env])
    return pip


def _run(cmd):
    # returns (rc, stdout, stderr) from shell command
    process = subprocess.Popen(cmd, stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE, shell=True)
    stdout, stderr = process.communicate()
    return (process.returncode, stdout, stderr)


def _fail(module, cmd, out, err):
    msg = ''
    if out:
        msg += "stdout: %s" % (out, )
    if err:
        msg += "\n:stderr: %s" % (err, )
    module.fail_json(cmd=cmd, msg=msg)


def main():
    state_map = dict(
        present='install',
        absent='uninstall -y',
        latest='install -U',
    )

    module = AnsibleModule(
        argument_spec=dict(
            state=dict(default='present', choices=state_map.keys()),
            name=dict(default=None, required=False),
            version=dict(default=None, required=False),
            requirements=dict(default=None, required=False),
            virtualenv=dict(default=None, required=False),
            use_mirrors=dict(default='yes', choices=BOOLEANS),
            extra_args=dict(default=None, required=False),
        ),
        required_one_of=[['name', 'requirements']],
        mutually_exclusive=[['name', 'requirements']],
    )

    state = module.params['state']
    name = module.params['name']
    version = module.params['version']
    requirements = module.params['requirements']
    use_mirrors = module.boolean(module.params['use_mirrors'])
    extra_args = module.params['extra_args']

    if state == 'latest' and version is not None:
        module.fail_json(msg='version is incompatible with state=latest')
    if name and '=' in name:
        module.fail_json(msg='version must be specified in the version parameter')

    err = ''
    out = ''

    env = module.params['virtualenv']

    if env:
        virtualenv = module.get_bin_path('virtualenv', True)
        if not os.path.exists(os.path.join(env, 'bin', 'activate')):
            cmd = '%s %s' % (virtualenv, env)
            rc, out_venv, err_venv = _run(cmd)
            out += out_venv
            err += err_venv
            if rc != 0:
                _fail(module, cmd, out, err)

    pip = _get_pip(module, env)

    cmd = '%s %s' % (pip, state_map[state])
    if state != 'absent' and use_mirrors:
        cmd += ' --use-mirrors'
    if extra_args:
        cmd += ' %s' % extra_args
    if name:
        cmd += ' %s' % _get_full_name(name, version)
    elif requirements:
        cmd += ' -r %s' % requirements

    rc, out_pip, err_pip = _run(cmd)
    out += out_pip
    err += err_pip
    if rc == 1 and state == 'absent' and 'not installed' in out_pip:
        pass  # rc is 1 when attempting to uninstall non-installed package
    elif rc != 0:
        _fail(module, cmd, out, err)

    if state == 'absent':
        changed = 'Successfully uninstalled' in out_pip
    else:
        changed = 'Successfully installed' in out_pip

    module.exit_json(changed=changed, cmd=cmd, name=name, version=version,
                     state=state, requirements=requirements, virtualenv=env)

# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>

main()