diff options
Diffstat (limited to 'cloudinit/net/__init__.py')
| -rw-r--r-- | cloudinit/net/__init__.py | 42 |
1 files changed, 38 insertions, 4 deletions
diff --git a/cloudinit/net/__init__.py b/cloudinit/net/__init__.py index f83d3681..3642fb1f 100644 --- a/cloudinit/net/__init__.py +++ b/cloudinit/net/__init__.py @@ -12,6 +12,7 @@ import re from cloudinit.net.network_state import mask_to_net_prefix from cloudinit import util +from cloudinit.url_helper import UrlError, readurl LOG = logging.getLogger(__name__) SYS_CLASS_NET = "/sys/class/net/" @@ -612,7 +613,8 @@ def get_interfaces(): Bridges and any devices that have a 'stolen' mac are excluded.""" ret = [] devs = get_devicelist() - empty_mac = '00:00:00:00:00:00' + # 16 somewhat arbitrarily chosen. Normally a mac is 6 '00:' tokens. + zero_mac = ':'.join(('00',) * 16) for name in devs: if not interface_has_own_mac(name): continue @@ -624,7 +626,8 @@ def get_interfaces(): # some devices may not have a mac (tun0) if not mac: continue - if mac == empty_mac and name != 'lo': + # skip nics that have no mac (00:00....) + if name != 'lo' and mac == zero_mac[:len(mac)]: continue ret.append((name, mac, device_driver(name), device_devid(name))) return ret @@ -645,16 +648,36 @@ def get_ib_hwaddrs_by_interface(): return ret +def has_url_connectivity(url): + """Return true when the instance has access to the provided URL + + Logs a warning if url is not the expected format. + """ + if not any([url.startswith('http://'), url.startswith('https://')]): + LOG.warning( + "Ignoring connectivity check. Expected URL beginning with http*://" + " received '%s'", url) + return False + try: + readurl(url, timeout=5) + except UrlError: + return False + return True + + class EphemeralIPv4Network(object): """Context manager which sets up temporary static network configuration. - No operations are performed if the provided interface is already connected. + No operations are performed if the provided interface already has the + specified configuration. + This can be verified with the connectivity_url. If unconnected, bring up the interface with valid ip, prefix and broadcast. If router is provided setup a default route for that interface. Upon context exit, clean up the interface leaving no configuration behind. """ - def __init__(self, interface, ip, prefix_or_mask, broadcast, router=None): + def __init__(self, interface, ip, prefix_or_mask, broadcast, router=None, + connectivity_url=None): """Setup context manager and validate call signature. @param interface: Name of the network interface to bring up. @@ -663,6 +686,8 @@ class EphemeralIPv4Network(object): prefix. @param broadcast: Broadcast address for the IPv4 network. @param router: Optionally the default gateway IP. + @param connectivity_url: Optionally, a URL to verify if a usable + connection already exists. """ if not all([interface, ip, prefix_or_mask, broadcast]): raise ValueError( @@ -673,6 +698,8 @@ class EphemeralIPv4Network(object): except ValueError as e: raise ValueError( 'Cannot setup network: {0}'.format(e)) + + self.connectivity_url = connectivity_url self.interface = interface self.ip = ip self.broadcast = broadcast @@ -681,6 +708,13 @@ class EphemeralIPv4Network(object): def __enter__(self): """Perform ephemeral network setup if interface is not connected.""" + if self.connectivity_url: + if has_url_connectivity(self.connectivity_url): + LOG.debug( + 'Skip ephemeral network setup, instance has connectivity' + ' to %s', self.connectivity_url) + return + self._bringup_device() if self.router: self._bringup_router() |