diff options
Diffstat (limited to 'inventory/libvirt/hosts/libvirt_generic.py')
| -rwxr-xr-x | inventory/libvirt/hosts/libvirt_generic.py | 95 |
1 files changed, 53 insertions, 42 deletions
diff --git a/inventory/libvirt/hosts/libvirt_generic.py b/inventory/libvirt/hosts/libvirt_generic.py index 4652f112e..1c9c17308 100755 --- a/inventory/libvirt/hosts/libvirt_generic.py +++ b/inventory/libvirt/hosts/libvirt_generic.py @@ -1,6 +1,6 @@ #!/usr/bin/env python2 -""" +''' libvirt external inventory script ================================= @@ -12,7 +12,7 @@ To use this, copy this file over /etc/ansible/hosts and chmod +x the file. This, more or less, allows you to keep one central database containing info about all of your managed instances. -""" +''' # (c) 2015, Jason DeTiberus <jdetiber@redhat.com> # @@ -36,9 +36,7 @@ info about all of your managed instances. import argparse import ConfigParser import os -import re import sys -from time import time import libvirt import xml.etree.ElementTree as ET @@ -49,8 +47,11 @@ except ImportError: class LibvirtInventory(object): + ''' libvirt dynamic inventory ''' def __init__(self): + ''' Main execution path ''' + self.inventory = dict() # A list of groups and the hosts in that group self.cache = dict() # Details about hosts in the inventory @@ -59,13 +60,15 @@ class LibvirtInventory(object): self.parse_cli_args() if self.args.host: - print self.json_format_dict(self.get_host_info(), self.args.pretty) + print _json_format_dict(self.get_host_info(), self.args.pretty) elif self.args.list: - print self.json_format_dict(self.get_inventory(), self.args.pretty) + print _json_format_dict(self.get_inventory(), self.args.pretty) else: # default action with no options - print self.json_format_dict(self.get_inventory(), self.args.pretty) + print _json_format_dict(self.get_inventory(), self.args.pretty) def read_settings(self): + ''' Reads the settings from the libvirt.ini file ''' + config = ConfigParser.SafeConfigParser() config.read( os.path.dirname(os.path.realpath(__file__)) + '/libvirt.ini' @@ -73,6 +76,8 @@ class LibvirtInventory(object): self.libvirt_uri = config.get('libvirt', 'uri') def parse_cli_args(self): + ''' Command line argument processing ''' + parser = argparse.ArgumentParser( description='Produce an Ansible Inventory file based on libvirt' ) @@ -96,25 +101,27 @@ class LibvirtInventory(object): self.args = parser.parse_args() def get_host_info(self): + ''' Get variables about a specific host ''' + inventory = self.get_inventory() if self.args.host in inventory['_meta']['hostvars']: return inventory['_meta']['hostvars'][self.args.host] def get_inventory(self): + ''' Construct the inventory ''' + inventory = dict(_meta=dict(hostvars=dict())) conn = libvirt.openReadOnly(self.libvirt_uri) if conn is None: - print "Failed to open connection to %s" % libvirt_uri + print "Failed to open connection to %s" % self.libvirt_uri sys.exit(1) domains = conn.listAllDomains() if domains is None: - print "Failed to list domains for connection %s" % libvirt_uri + print "Failed to list domains for connection %s" % self.libvirt_uri sys.exit(1) - arp_entries = self.parse_arp_entries() - for domain in domains: hostvars = dict(libvirt_name=domain.name(), libvirt_id=domain.ID(), @@ -130,21 +137,30 @@ class LibvirtInventory(object): hostvars['libvirt_status'] = 'running' root = ET.fromstring(domain.XMLDesc()) - ns = {'ansible': 'https://github.com/ansible/ansible'} - for tag_elem in root.findall('./metadata/ansible:tags/ansible:tag', ns): + ansible_ns = {'ansible': 'https://github.com/ansible/ansible'} + for tag_elem in root.findall('./metadata/ansible:tags/ansible:tag', ansible_ns): tag = tag_elem.text - self.push(inventory, "tag_%s" % tag, domain_name) - self.push(hostvars, 'libvirt_tags', tag) + _push(inventory, "tag_%s" % tag, domain_name) + _push(hostvars, 'libvirt_tags', tag) # TODO: support more than one network interface, also support # interface types other than 'network' interface = root.find("./devices/interface[@type='network']") if interface is not None: + source_elem = interface.find('source') mac_elem = interface.find('mac') - if mac_elem is not None: - mac = mac_elem.get('address') - if mac in arp_entries: - ip_address = arp_entries[mac]['ip_address'] + if source_elem is not None and \ + mac_elem is not None: + # Adding this to disable pylint check specifically + # ignoring libvirt-python versions that + # do not include DHCPLeases + # This is needed until we upgrade the build bot to + # RHEL7 (>= 1.2.6 libvirt) + # pylint: disable=no-member + dhcp_leases = conn.networkLookupByName(source_elem.get('network')) \ + .DHCPLeases(mac_elem.get('address')) + if len(dhcp_leases) > 0: + ip_address = dhcp_leases[0]['ipaddr'] hostvars['ansible_ssh_host'] = ip_address hostvars['libvirt_ip_address'] = ip_address @@ -152,28 +168,23 @@ class LibvirtInventory(object): return inventory - def parse_arp_entries(self): - arp_entries = dict() - with open('/proc/net/arp', 'r') as f: - # throw away the header - f.readline() - - for line in f: - ip_address, _, _, mac, _, device = line.strip().split() - arp_entries[mac] = dict(ip_address=ip_address, device=device) - - return arp_entries - - def push(self, my_dict, key, element): - if key in my_dict: - my_dict[key].append(element) - else: - my_dict[key] = [element] - - def json_format_dict(self, data, pretty=False): - if pretty: - return json.dumps(data, sort_keys=True, indent=2) - else: - return json.dumps(data) +def _push(my_dict, key, element): + ''' + Push element to the my_dict[key] list. + After having initialized my_dict[key] if it dosn't exist. + ''' + + if key in my_dict: + my_dict[key].append(element) + else: + my_dict[key] = [element] + +def _json_format_dict(data, pretty=False): + ''' Serialize data to a JSON formated str ''' + + if pretty: + return json.dumps(data, sort_keys=True, indent=2) + else: + return json.dumps(data) LibvirtInventory() |