bpo-28009: Fix uuid SkipUnless logic to be based on platform programs capable of introspection (GH-12777)

uuid could try fallback methods that had no chance of working on a particular
platform, and this could cause spurious test failures, as well as degraded
performance as fallback options were tried and failed.

This fixes both the uuid module and its test's SkipUnless logic to use a
prefiltered list of techniques that may at least potentially work on that platform.

Patch by Michael Felt (aixtools).
This commit is contained in:
Michael Felt 2019-06-15 17:52:29 +02:00 committed by Nick Coghlan
parent 7a68f8c28b
commit 3a1d50e7e5
3 changed files with 47 additions and 19 deletions

View File

@ -462,8 +462,7 @@ class BaseTestUUID:
with unittest.mock.patch.multiple(
self.uuid,
_node=None, # Ignore any cached node value.
_NODE_GETTERS_WIN32=[too_large_getter],
_NODE_GETTERS_UNIX=[too_large_getter],
_GETTERS=[too_large_getter],
):
node = self.uuid.getnode()
self.assertTrue(0 < node < (1 << 48), '%012x' % node)
@ -673,7 +672,7 @@ class TestUUIDWithExtModule(BaseTestUUID, unittest.TestCase):
class BaseTestInternals:
uuid = None
_uuid = py_uuid
@unittest.skipUnless(os.name == 'posix', 'requires Posix')
def test_find_mac(self):
@ -708,27 +707,32 @@ eth0 Link encap:Ethernet HWaddr 12:34:56:78:90:ab
self.assertTrue(0 < node < (1 << 48),
"%s is not an RFC 4122 node ID" % hex)
@unittest.skipUnless(os.name == 'posix', 'requires Posix')
@unittest.skipUnless(_uuid._ifconfig_getnode in _uuid._GETTERS,
"ifconfig is not used for introspection on this platform")
def test_ifconfig_getnode(self):
node = self.uuid._ifconfig_getnode()
self.check_node(node, 'ifconfig')
@unittest.skipUnless(os.name == 'posix', 'requires Posix')
@unittest.skipUnless(_uuid._ip_getnode in _uuid._GETTERS,
"ip is not used for introspection on this platform")
def test_ip_getnode(self):
node = self.uuid._ip_getnode()
self.check_node(node, 'ip')
@unittest.skipUnless(os.name == 'posix', 'requires Posix')
@unittest.skipUnless(_uuid._arp_getnode in _uuid._GETTERS,
"arp is not used for introspection on this platform")
def test_arp_getnode(self):
node = self.uuid._arp_getnode()
self.check_node(node, 'arp')
@unittest.skipUnless(os.name == 'posix', 'requires Posix')
@unittest.skipUnless(_uuid._lanscan_getnode in _uuid._GETTERS,
"lanscan is not used for introspection on this platform")
def test_lanscan_getnode(self):
node = self.uuid._lanscan_getnode()
self.check_node(node, 'lanscan')
@unittest.skipUnless(os.name == 'posix', 'requires Posix')
@unittest.skipUnless(_uuid._netstat_getnode in _uuid._GETTERS,
"netstat is not used for introspection on this platform")
def test_netstat_getnode(self):
node = self.uuid._netstat_getnode()
self.check_node(node, 'netstat')

View File

@ -45,6 +45,7 @@ Typical usage:
"""
import os
import platform
import sys
from enum import Enum
@ -52,6 +53,12 @@ from enum import Enum
__author__ = 'Ka-Ping Yee <ping@zesty.ca>'
# The recognized platforms - known behaviors
_AIX = platform.system() == 'AIX'
_DARWIN = platform.system() == 'Darwin'
_LINUX = platform.system() == 'Linux'
_WINDOWS = platform.system() == 'Windows'
RESERVED_NCS, RFC_4122, RESERVED_MICROSOFT, RESERVED_FUTURE = [
'reserved for NCS compatibility', 'specified in RFC 4122',
'reserved for Microsoft compatibility', 'reserved for future definition']
@ -673,13 +680,32 @@ def _random_getnode():
return random.getrandbits(48) | (1 << 40)
# _OS_GETTERS, when known, are targetted for a specific OS or platform.
# The order is by 'common practice' on the specified platform.
# Note: 'posix' and 'windows' _OS_GETTERS are prefixed by a dll/dlload() method
# which, when successful, means none of these "external" methods are called.
# _GETTERS is (also) used by test_uuid.py to SkipUnless(), e.g.,
# @unittest.skipUnless(_uuid._ifconfig_getnode in _uuid._GETTERS, ...)
if _LINUX:
_OS_GETTERS = [_ip_getnode, _ifconfig_getnode]
elif _DARWIN:
_OS_GETTERS = [_ifconfig_getnode, _arp_getnode, _netstat_getnode]
elif _WINDOWS:
_OS_GETTERS = [_netbios_getnode, _ipconfig_getnode]
elif _AIX:
_OS_GETTERS = [_netstat_getnode]
else:
_OS_GETTERS = [_ifconfig_getnode, _ip_getnode, _arp_getnode,
_netstat_getnode, _lanscan_getnode]
if os.name == 'posix':
_GETTERS = [_unix_getnode] + _OS_GETTERS
elif os.name == 'nt':
_GETTERS = [_windll_getnode] + _OS_GETTERS
else:
_GETTERS = _OS_GETTERS
_node = None
_NODE_GETTERS_WIN32 = [_windll_getnode, _netbios_getnode, _ipconfig_getnode]
_NODE_GETTERS_UNIX = [_unix_getnode, _ifconfig_getnode, _ip_getnode,
_arp_getnode, _lanscan_getnode, _netstat_getnode]
def getnode(*, getters=None):
"""Get the hardware address as a 48-bit positive integer.
@ -692,12 +718,7 @@ def getnode(*, getters=None):
if _node is not None:
return _node
if sys.platform == 'win32':
getters = _NODE_GETTERS_WIN32
else:
getters = _NODE_GETTERS_UNIX
for getter in getters + [_random_getnode]:
for getter in _GETTERS + [_random_getnode]:
try:
_node = getter()
except:

View File

@ -0,0 +1,3 @@
Modify the test_uuid logic to test when a program is available
AND can be used to obtain a MACADDR as basis for an UUID.
Patch by M. Felt