ansible/library/openbsd_pkg

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

# (c) 2013, Patrik Lundin <patrik.lundin.swe@gmail.com>
#
# 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/>.

import re

DOCUMENTATION = '''
---
module: openbsd_pkg
author: Patrik Lundin
version_added: 1.1
short_description: Manage packages on OpenBSD.
description:
    - Manage packages on OpenBSD using the pkg tools.
options:
    name:
        required: true
        description:
        - Name of the package.
    state:
        required: true
        choices: [ present, latest, absent ]
        description:
          - C(present) will make sure the package is installed.
            C(latest) will make sure the latest version of the package is installed.
            C(absent) will make sure the specified package is not installed.
examples:
    - description: Make sure nmap is installed
      code: "openbsd_pkg: name=nmap state=present"
    - description: Make sure nmap is the latest version
      code: "openbsd_pkg: name=nmap state=latest"
    - description: Make sure nmap is not installed
      code: "openbsd_pkg: name=nmap state=absent"
'''

# select whether we dump additional debug info through syslog
syslogging = False

# Function used for executing commands. 
def execute_command(cmd, syslogging):
    if syslogging:
        syslog.openlog('ansible-%s' % os.path.basename(__file__))
        syslog.syslog(syslog.LOG_NOTICE, 'Command %s' % '|'.join(cmd))

    p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    (out, err) = p.communicate()
    rc = p.returncode
    return (rc, out, err)

# Function used for getting the name of a currently installed package.
def get_current_name(name, specific_version):
    info_cmd = 'pkg_info'
    (rc, stdout, stderr) = execute_command("%s" % (info_cmd), syslogging)
    if rc != 0:
        return (rc, stdout, stderr)

    if specific_version:
        syntax = "%s"
    else:
        syntax = "%s-"

    for line in stdout.splitlines():
        if syntax % name in line:
           current_name = line.split()[0]

    return current_name

# Function used to find out if a package is currently installed.
def get_package_state(name, specific_version):
    info_cmd = 'pkg_info -e'

    if specific_version:
        syntax = "%s %s"
    else:
        syntax = "%s %s-*"

    rc, stdout, stderr = execute_command(syntax % (info_cmd, name), syslogging)

    if rc == 0:
        return True
    else:
        return False

# Function used to make sure a package is present.
def package_present(name, installed_state):
    install_cmd = 'pkg_add -I'
    if installed_state is False:
        rc, stdout, stderr = execute_command("%s %s" % (install_cmd, name), syslogging)
        # pkg_add returns 0 even if the package does not exist
        # so depend on stderr instead if something bad happened.
        if stderr:
            rc = 1
            changed=False
        else:
            changed=True
    else:
        rc = 0
        stdout = ''
        stderr = ''
        changed=False

    return (rc, stdout, stderr, changed)

# Function used to make sure a package is the latest available version.
def package_latest(name, installed_state, specific_version):

    upgrade_cmd = 'pkg_add -u'
    pre_upgrade_name = ''
    post_upgrade_name = ''
    if installed_state is True:

        # pkg_add -u exits 0 even if no update was needed, so compare the
        # installed package before and after to know if we changed anything.
        pre_upgrade_name = get_current_name(name, specific_version)

        (rc, stdout, stderr) = execute_command("%s %s" % (upgrade_cmd, name), syslogging)

        # 'pkg_add -u' returns 0 even when something strange happened, stdout
        # should be empty if everything went fine.
        if stdout:
            rc=1

        post_upgrade_name = get_current_name(name, specific_version)

        if pre_upgrade_name == post_upgrade_name:
            changed = False
        else:
            changed = True

        return (rc, stdout, stderr, changed)

    else:
        # If package was not installed at all just make it present.
        return package_present(name, installed_state)

# Function used to make sure a package is not installed.
def package_absent(name, installed_state):
    remove_cmd = 'pkg_delete -I'
    if installed_state is True:
        rc, stdout, stderr = execute_command("%s %s" % (remove_cmd, name), syslogging)

        if rc == 0:
            changed=True
        else:
            changed=False
    else:
        rc = 0
        stdout = ''
        stderr = ''
        changed=False

    return (rc, stdout, stderr, changed)

# ===========================================
# Main control flow

def main():
    module = AnsibleModule(
        argument_spec = dict(
            name = dict(required=True),
            state = dict(required=True, choices=['absent', 'installed', 'latest', 'present', 'removed']),
        )
    )

    name      = module.params['name']
    state     = module.params['state']

    rc = 0
    stdout = ''
    stderr = ''
    result = {}
    result['name'] = name
    result['state'] = state

    # Decide if the name contains a version number.
    # This regex is based on packages-specs(7).
    match = re.search("-[0-9]", name)
    if match:
        specific_version = True
    else:
        specific_version = False

    # Get package state
    installed_state = get_package_state(name, specific_version)

    # Perform requested action
    if state in ['installed', 'present']:
        (rc, stdout, stderr, changed) = package_present(name, installed_state)
    elif state in ['absent', 'removed']:
        (rc, stdout, stderr, changed) = package_absent(name, installed_state)
    elif state == 'latest':
        (rc, stdout, stderr, changed) = package_latest(name, installed_state, specific_version)

    if rc != 0:
        if stderr:
            module.fail_json(msg=stderr)
        else:
            module.fail_json(msg=stdout)

    result['changed'] = changed

    module.exit_json(**result)

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