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community.general/plugins/modules/system/open_iscsi.py
patchback[bot] 4c100aef47
open_iscsi - minor refactoring () ()
* open_iscsi - minor refactoring

* added changelog fragment

(cherry picked from commit 1f5345881d)

Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>
2021-08-31 15:04:39 +02:00

407 lines
13 KiB
Python

#!/usr/bin/python
# -*- coding: utf-8 -*-
# Copyright: (c) 2013, Serge van Ginderachter <serge@vanginderachter.be>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import absolute_import, division, print_function
__metaclass__ = type
DOCUMENTATION = r'''
---
module: open_iscsi
author:
- Serge van Ginderachter (@srvg)
short_description: Manage iSCSI targets with Open-iSCSI
description:
- Discover targets on given portal, (dis)connect targets, mark targets to
manually or auto start, return device nodes of connected targets.
requirements:
- open_iscsi library and tools (iscsiadm)
options:
portal:
description:
- The domain name or IP address of the iSCSI target.
type: str
aliases: [ ip ]
port:
description:
- The port on which the iSCSI target process listens.
type: str
default: 3260
target:
description:
- The iSCSI target name.
type: str
aliases: [ name, targetname ]
login:
description:
- Whether the target node should be connected.
type: bool
aliases: [ state ]
node_auth:
description:
- The value for C(discovery.sendtargets.auth.authmethod).
type: str
default: CHAP
node_user:
description:
- The value for C(discovery.sendtargets.auth.username).
type: str
node_pass:
description:
- The value for C(discovery.sendtargets.auth.password).
type: str
auto_node_startup:
description:
- Whether the target node should be automatically connected at startup.
type: bool
aliases: [ automatic ]
auto_portal_startup:
description:
- Whether the target node portal should be automatically connected at startup.
type: bool
version_added: 3.2.0
discover:
description:
- Whether the list of target nodes on the portal should be
(re)discovered and added to the persistent iSCSI database.
- Keep in mind that C(iscsiadm) discovery resets configuration, like C(node.startup)
to manual, hence combined with C(auto_node_startup=yes) will always return
a changed state.
type: bool
default: false
show_nodes:
description:
- Whether the list of nodes in the persistent iSCSI database should be returned by the module.
type: bool
default: false
'''
EXAMPLES = r'''
- name: Perform a discovery on sun.com and show available target nodes
community.general.open_iscsi:
show_nodes: yes
discover: yes
portal: sun.com
- name: Perform a discovery on 10.1.2.3 and show available target nodes
community.general.open_iscsi:
show_nodes: yes
discover: yes
ip: 10.1.2.3
# NOTE: Only works if exactly one target is exported to the initiator
- name: Discover targets on portal and login to the one available
community.general.open_iscsi:
portal: '{{ iscsi_target }}'
login: yes
discover: yes
- name: Connect to the named target, after updating the local persistent database (cache)
community.general.open_iscsi:
login: yes
target: iqn.1986-03.com.sun:02:f8c1f9e0-c3ec-ec84-c9c9-8bfb0cd5de3d
- name: Disconnect from the cached named target
community.general.open_iscsi:
login: no
target: iqn.1986-03.com.sun:02:f8c1f9e0-c3ec-ec84-c9c9-8bfb0cd5de3d
- name: Override and disable automatic portal login on specific portal
community.general.open_iscsi:
login: false
portal: 10.1.1.250
auto_portal_startup: false
target: iqn.1986-03.com.sun:02:f8c1f9e0-c3ec-ec84-c9c9-8bfb0cd5de3d
'''
import glob
import os
import re
import socket
import time
from ansible.module_utils.basic import AnsibleModule
ISCSIADM = 'iscsiadm'
iscsiadm_cmd = None
def compare_nodelists(l1, l2):
l1.sort()
l2.sort()
return l1 == l2
def iscsi_get_cached_nodes(module, portal=None):
cmd = [iscsiadm_cmd, '--mode', 'node']
rc, out, err = module.run_command(cmd)
nodes = []
if rc == 0:
lines = out.splitlines()
for line in lines:
# line format is "ip:port,target_portal_group_tag targetname"
parts = line.split()
if len(parts) > 2:
module.fail_json(msg='error parsing output', cmd=cmd)
target = parts[1]
parts = parts[0].split(':')
target_portal = parts[0]
if portal is None or portal == target_portal:
nodes.append(target)
# older versions of scsiadm don't have nice return codes
# for newer versions see iscsiadm(8); also usr/iscsiadm.c for details
# err can contain [N|n]o records...
elif rc == 21 or (rc == 255 and "o records found" in err):
pass
else:
module.fail_json(cmd=cmd, rc=rc, msg=err)
return nodes
def iscsi_discover(module, portal, port):
cmd = [iscsiadm_cmd, '--mode', 'discovery', '--type', 'sendtargets', '--portal', '%s:%s' % (portal, port)]
module.run_command(cmd, check_rc=True)
def target_loggedon(module, target, portal=None, port=None):
cmd = [iscsiadm_cmd, '--mode', 'session']
rc, out, err = module.run_command(cmd)
if portal is None:
portal = ""
if port is None:
port = ""
if rc == 0:
search_re = "%s:%s.*%s" % (re.escape(portal), port, re.escape(target))
return re.search(search_re, out) is not None
elif rc == 21:
return False
else:
module.fail_json(cmd=cmd, rc=rc, msg=err)
def target_login(module, target, portal=None, port=None):
node_auth = module.params['node_auth']
node_user = module.params['node_user']
node_pass = module.params['node_pass']
if node_user:
params = [('node.session.auth.authmethod', node_auth),
('node.session.auth.username', node_user),
('node.session.auth.password', node_pass)]
for (name, value) in params:
cmd = [iscsiadm_cmd, '--mode', 'node', '--targetname', target, '--op=update', '--name', name, '--value', value]
module.run_command(cmd, check_rc=True)
cmd = [iscsiadm_cmd, '--mode', 'node', '--targetname', target, '--login']
if portal is not None and port is not None:
cmd.append('--portal')
cmd.append('%s:%s' % (portal, port))
module.run_command(cmd, check_rc=True)
def target_logout(module, target):
cmd = [iscsiadm_cmd, '--mode', 'node', '--targetname', target, '--logout']
module.run_command(cmd, check_rc=True)
def target_device_node(target):
# if anyone know a better way to find out which devicenodes get created for
# a given target...
devices = glob.glob('/dev/disk/by-path/*%s*' % target)
devdisks = []
for dev in devices:
# exclude partitions
if "-part" not in dev:
devdisk = os.path.realpath(dev)
# only add once (multi-path?)
if devdisk not in devdisks:
devdisks.append(devdisk)
return devdisks
def target_isauto(module, target, portal=None, port=None):
cmd = [iscsiadm_cmd, '--mode', 'node', '--targetname', target]
if portal is not None and port is not None:
cmd.append('--portal')
cmd.append('%s:%s' % (portal, port))
dummy, out, dummy = module.run_command(cmd, check_rc=True)
lines = out.splitlines()
for line in lines:
if 'node.startup' in line:
return 'automatic' in line
return False
def target_setauto(module, target, portal=None, port=None):
cmd = [iscsiadm_cmd, '--mode', 'node', '--targetname', target, '--op=update', '--name', 'node.startup', '--value', 'automatic']
if portal is not None and port is not None:
cmd.append('--portal')
cmd.append('%s:%s' % (portal, port))
module.run_command(cmd, check_rc=True)
def target_setmanual(module, target, portal=None, port=None):
cmd = [iscsiadm_cmd, '--mode', 'node', '--targetname', target, '--op=update', '--name', 'node.startup', '--value', 'manual']
if portal is not None and port is not None:
cmd.append('--portal')
cmd.append('%s:%s' % (portal, port))
module.run_command(cmd, check_rc=True)
def main():
# load ansible module object
module = AnsibleModule(
argument_spec=dict(
# target
portal=dict(type='str', aliases=['ip']),
port=dict(type='str', default='3260'),
target=dict(type='str', aliases=['name', 'targetname']),
node_auth=dict(type='str', default='CHAP'),
node_user=dict(type='str'),
node_pass=dict(type='str', no_log=True),
# actions
login=dict(type='bool', aliases=['state']),
auto_node_startup=dict(type='bool', aliases=['automatic']),
auto_portal_startup=dict(type='bool'),
discover=dict(type='bool', default=False),
show_nodes=dict(type='bool', default=False),
),
required_together=[['node_user', 'node_pass']],
required_if=[('discover', True, ['portal'])],
supports_check_mode=True,
)
global iscsiadm_cmd
iscsiadm_cmd = module.get_bin_path('iscsiadm', required=True)
# parameters
portal = module.params['portal']
if portal:
try:
portal = socket.getaddrinfo(portal, None)[0][4][0]
except socket.gaierror:
module.fail_json(msg="Portal address is incorrect")
target = module.params['target']
port = module.params['port']
login = module.params['login']
automatic = module.params['auto_node_startup']
automatic_portal = module.params['auto_portal_startup']
discover = module.params['discover']
show_nodes = module.params['show_nodes']
check = module.check_mode
cached = iscsi_get_cached_nodes(module, portal)
# return json dict
result = {'changed': False}
if discover:
if check:
nodes = cached
else:
iscsi_discover(module, portal, port)
nodes = iscsi_get_cached_nodes(module, portal)
if not compare_nodelists(cached, nodes):
result['changed'] |= True
result['cache_updated'] = True
else:
nodes = cached
if login is not None or automatic is not None:
if target is None:
if len(nodes) > 1:
module.fail_json(msg="Need to specify a target")
else:
target = nodes[0]
else:
# check given target is in cache
check_target = False
for node in nodes:
if node == target:
check_target = True
break
if not check_target:
module.fail_json(msg="Specified target not found")
if show_nodes:
result['nodes'] = nodes
if login is not None:
loggedon = target_loggedon(module, target, portal, port)
if (login and loggedon) or (not login and not loggedon):
result['changed'] |= False
if login:
result['devicenodes'] = target_device_node(target)
elif not check:
if login:
target_login(module, target, portal, port)
# give udev some time
time.sleep(1)
result['devicenodes'] = target_device_node(target)
else:
target_logout(module, target)
result['changed'] |= True
result['connection_changed'] = True
else:
result['changed'] |= True
result['connection_changed'] = True
if automatic is not None:
isauto = target_isauto(module, target)
if (automatic and isauto) or (not automatic and not isauto):
result['changed'] |= False
result['automatic_changed'] = False
elif not check:
if automatic:
target_setauto(module, target)
else:
target_setmanual(module, target)
result['changed'] |= True
result['automatic_changed'] = True
else:
result['changed'] |= True
result['automatic_changed'] = True
if automatic_portal is not None:
isauto = target_isauto(module, target, portal, port)
if (automatic_portal and isauto) or (not automatic_portal and not isauto):
result['changed'] |= False
result['automatic_portal_changed'] = False
elif not check:
if automatic_portal:
target_setauto(module, target, portal, port)
else:
target_setmanual(module, target, portal, port)
result['changed'] |= True
result['automatic_portal_changed'] = True
else:
result['changed'] |= True
result['automatic_portal_changed'] = True
module.exit_json(**result)
if __name__ == '__main__':
main()