ansible/library/zfs

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

# (c) 2013, Johan Wiren <johan.wiren.se@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/>.
#

DOCUMENTATION = '''
---
module: zfs
short_description: Manage zfs
description:
    - Manages ZFS file systems on Solaris and FreeBSD. Can manage file systems, volumes
      and snapshots. Supports the following options from zfs(1M) (See the man page for 
      more information):
      aclinherit
      aclmode
      atime
      canmount
      casesensitivity
      checksum
      compression
      copies
      dedup
      devices
      exec
      jailed
      logbias
      mountpoint
      nbmand
      normalization
      primarycache
      quota
      readonly
      recordsize
      refquota
      refreservation
      reservation
      secondarycache
      setuid
      shareiscsi
      sharenfs
      sharesmb
      snapdir
      sync
      utf8only
      volsize
      volblocksize
      vscan
      xattr
      zoned
options:
  name:
    description:
      - File system, snapshot or volume name e.g. C(rpool/myfs)
    required: true
  state:
    description:
      - Whether to create (C(present)), or remove (C(absent)) a file system, snapshot or volume.
    required: true
    choices: [present, absent]
examples:
  - code: zfs name=rpool/myfs state=present
    description: Create a new file system called myfs in pool rpool
  - code: zfs name=rpool/myvol state=present volsize=10M
    description: Create a new volume called myvol in pool rpool. 
  - code: zfs name=rpool/myfs@mysnapshot state=present
    description: Create a snapshot of rpool/myfs file system.
  - code: zfs name=rpool/myfs2 state=present snapdir=enabled
    description: Create a new file system called myfs2 whith snapdir enabled
author: Johan Wiren
'''
import os

class Zfs(object):
    def __init__(self, module, name, properties):
        self.module = module
        self.name = name
        self.properties = properties
        self.changed = False

        self.immutable_properties = [ 'casesensitivity', 'normalization', 'utf8only' ]

    def exists(self):
        cmd = [self.module.get_bin_path('zfs', True)]
        cmd.append('list')
        cmd.append('-t all')
        cmd.append(self.name)
        (rc, out, err) = self.module.run_command(' '.join(cmd))
        if rc == 0:
            return True
        else:
            return False

    def create(self):
        properties=self.properties
        volsize = properties.pop('volsize', None)
        volblocksize = properties.pop('volblocksize', None)
        if "@" in self.name:
            action = 'snapshot'
        else:
            action = 'create'

        cmd = [self.module.get_bin_path('zfs', True)]
        cmd.append(action)
        if volblocksize:
            cmd.append('-b %s' % volblocksize)
        if properties:
            for prop, value in properties.iteritems():
                cmd.append('-o %s=%s' % (prop, value))
        if volsize:
            cmd.append('-V')
            cmd.append(volsize)
        cmd.append(self.name)
        (rc, err, out) = self.module.run_command(' '.join(cmd))
        if rc == 0:
            self.changed=True
        else:
            self.module.fail_json(msg=out)

    def destroy(self):
        cmd = [self.module.get_bin_path('zfs', True)]
        cmd.append('destroy')
        cmd.append(self.name)
        (rc, err, out) = self.module.run_command(' '.join(cmd))
        if rc == 0:
            self.changed = True
        else:
            self.module.fail_json(msg=out)

    def set_property(self, prop, value):
        cmd = [self.module.get_bin_path('zfs', True)]
        cmd.append('set')
        cmd.append(prop + '=' + value)
        cmd.append(self.name)
        (rc, err, out) = self.module.run_command(' '.join(cmd))
        if rc == 0:
            self.changed = True
        else:
            self.module.fail_json(msg=out)

    def set_properties_if_changed(self):
        current_properties = self.get_current_properties()
        for prop, value in self.properties.iteritems():
            if current_properties[prop] != value:
                if prop in self.immutable_properties:
                    self.module.fail_json(msg='Cannot change property %s after creation.' % prop)
                else:
                    self.set_property(prop, value) 

    def get_current_properties(self):
        cmd = [self.module.get_bin_path('zfs', True)]
        cmd.append('get -H all')
        cmd.append(self.name)
        rc, out, err = self.module.run_command(' '.join(cmd))
        properties=dict()
        for l in out.splitlines():
            p, v = l.split()[1:3]
            properties[p] = v
        return properties

    def run_command(self, cmd):
        progname = cmd[0]
        cmd[0] = module.get_bin_path(progname, True)
        return module.run_command(cmd)

def main():
    module = AnsibleModule(
        argument_spec = {
            'name':            {'required': True},
            'state':           {'required': True,  'choices':['present', 'absent']},
            'aclinherit':      {'required': False, 'choices':['discard', 'noallow', 'restricted', 'passthrough', 'passthrough-x']},
            'aclmode':         {'required': False, 'choices':['discard', 'groupmask', 'passthrough']},
            'atime':           {'required': False, 'choices':['on', 'off']},
            'canmount':        {'required': False, 'choices':['on', 'off', 'noauto']},
            'casesensitivity': {'required': False, 'choices':['sensitive', 'insensitive', 'mixed']},
            'checksum':        {'required': False, 'choices':['on', 'off', 'fletcher2', 'fletcher4', 'sha256']},
            'compression':     {'required': False, 'choices':['on', 'off', 'lzjb', 'gzip', 'gzip-1', 'gzip-2', 'gzip-3', 'gzip-4', 'gzip-5', 'gzip-6', 'gzip-7', 'gzip-8', 'gzip-9']},
            'copies':          {'required': False, 'choices':['1', '2', '3']},
            'dedup':           {'required': False, 'choices':['on', 'off']},
            'devices':         {'required': False, 'choices':['on', 'off']},
            'exec':            {'required': False, 'choices':['on', 'off']},
            # Not supported
            #'groupquota':      {'required': False},
            'jailed':          {'required': False, 'choices':['on', 'off']},
            'logbias':         {'required': False, 'choices':['latency', 'throughput']},
            'mountpoint':      {'required': False},
            'nbmand':          {'required': False, 'choices':['on', 'off']},
            'normalization':   {'required': False, 'choices':['none', 'formC', 'formD', 'formKC', 'formKD']},
            'primarycache':    {'required': False, 'choices':['all', 'none', 'metadata']},
            'quota':           {'required': False},
            'readonly':        {'required': False, 'choices':['on', 'off']},
            'recordsize':      {'required': False},
            'refquota':        {'required': False},
            'refreservation':  {'required': False},
            'reservation':     {'required': False},
            'secondarycache':  {'required': False, 'choices':['all', 'none', 'metadata']},
            'setuid':          {'required': False, 'choices':['on', 'off']},
            'shareiscsi':      {'required': False, 'choices':['on', 'off']},
            'sharenfs':        {'required': False},
            'sharesmb':        {'required': False},
            'snapdir':         {'required': False, 'choices':['hidden', 'visible']},
            'sync':            {'required': False, 'choices':['on', 'off']},
            # Not supported
            #'userquota':       {'required': False},
            'utf8only':        {'required': False, 'choices':['on', 'off']},
            'volsize':         {'required': False},
            'volblocksize':    {'required': False},
            'vscan':           {'required': False, 'choices':['on', 'off']},
            'xattr':           {'required': False, 'choices':['on', 'off']},
            'zoned':           {'required': False, 'choices':['on', 'off']},
            }
        )
    state = module.params.pop('state')
    name = module.params.pop('name')
    # Remaining items in module.params are zfs properties

    # Remove 'null' value properties
    properties = dict()
    for prop, value in module.params.iteritems():
        if value:
            properties[prop] = value
    
    result = {}
    result['name'] = name
    result['state'] = state

    zfs=Zfs(module, name, properties)

    if state == 'present':
        if zfs.exists():
            zfs.set_properties_if_changed()
        else:
            zfs.create()

    elif state == 'absent':
        if zfs.exists():
            zfs.destroy()

    result.update(zfs.properties)
    result['changed'] = zfs.changed
    module.exit_json(**result)

# include magic from lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()