bpo-11192: Skip unsupported cases in test_socket on AIX (GH-8954)

* use platform.system() as runtime test, rather than sys.platform() build-time test
* IPv6 zone id support on AIX is limited to inet_pton6_zone(), so skip related
  getaddrinfo() and getnameinfo() tests as not supported

Lib/test/test_socket.py

@@ -12,6 +12,7 @@ import traceback
 import queue
 import sys
 import os
+import platform
 import array
 import contextlib
 from weakref import proxy
@@ -39,6 +40,7 @@ MSG = 'Michael Gilfix was here\u1234\r\n'.encode('utf-8')
 MAIN_TIMEOUT = 60.0
 
 VSOCKPORT = 1234
+AIX = platform.system() == "AIX"
 
 try:
     import _socket
@@ -1116,7 +1118,7 @@ class GeneralModuleTests(unittest.TestCase):
         self.assertEqual(b'\x01\x02\x03\x04', f('1.2.3.4'))
         self.assertEqual(b'\xff\xff\xff\xff', f('255.255.255.255'))
         # bpo-29972: inet_pton() doesn't fail on AIX
-        if not sys.platform.startswith('aix'):
+        if not AIX:
             assertInvalid(f, '0.0.0.')
         assertInvalid(f, '300.0.0.0')
         assertInvalid(f, 'a.0.0.0')
@@ -1173,10 +1175,10 @@ class GeneralModuleTests(unittest.TestCase):
         assertInvalid('1::abc::')
         assertInvalid('1::abc::def')
         assertInvalid('1:2:3:4:5:6')
+        assertInvalid('1:2:3:4:5:6:')
         assertInvalid('1:2:3:4:5:6:7:8:0')
         # bpo-29972: inet_pton() doesn't fail on AIX
-        if not sys.platform.startswith('aix'):
-            assertInvalid('1:2:3:4:5:6:')
+        if not AIX:
             assertInvalid('1:2:3:4:5:6:7:8:')
 
         self.assertEqual(b'\x00' * 12 + b'\xfe\x2a\x17\x40',
@@ -1625,6 +1627,7 @@ class GeneralModuleTests(unittest.TestCase):
     @unittest.skipUnless(
         hasattr(socket, 'if_nameindex'),
         'if_nameindex is not supported')
+    @unittest.skipIf(AIX, 'Symbolic scope id does not work')
     def test_getaddrinfo_ipv6_scopeid_symbolic(self):
         # Just pick up any network interface (Linux, Mac OS X)
         (ifindex, test_interface) = socket.if_nameindex()[0]
@@ -1658,6 +1661,7 @@ class GeneralModuleTests(unittest.TestCase):
     @unittest.skipUnless(
         hasattr(socket, 'if_nameindex'),
         'if_nameindex is not supported')
+    @unittest.skipIf(AIX, 'Symbolic scope id does not work')
     def test_getnameinfo_ipv6_scopeid_symbolic(self):
         # Just pick up any network interface.
         (ifindex, test_interface) = socket.if_nameindex()[0]
@@ -1666,8 +1670,7 @@ class GeneralModuleTests(unittest.TestCase):
         self.assertEqual(nameinfo, ('ff02::1de:c0:face:8d%' + test_interface, '1234'))
 
     @unittest.skipUnless(support.IPV6_ENABLED, 'IPv6 required for this test.')
-    @unittest.skipUnless(
-        sys.platform == 'win32',
+    @unittest.skipUnless( sys.platform == 'win32',
         'Numeric scope id does not work or undocumented')
     def test_getnameinfo_ipv6_scopeid_numeric(self):
         # Also works on Linux (undocumented), but does not work on Mac OS X
@@ -3238,7 +3241,7 @@ class SCMRightsTest(SendrecvmsgServerTimeoutBase):
         self.createAndSendFDs(1)
 
     @unittest.skipIf(sys.platform == "darwin", "skipping, see issue #12958")
-    @unittest.skipIf(sys.platform.startswith("aix"), "skipping, see issue #22397")
+    @unittest.skipIf(AIX, "skipping, see issue #22397")
     @requireAttrs(socket, "CMSG_SPACE")
     def testFDPassSeparate(self):
         # Pass two FDs in two separate arrays.  Arrays may be combined
@@ -3249,7 +3252,7 @@ class SCMRightsTest(SendrecvmsgServerTimeoutBase):
 
     @testFDPassSeparate.client_skip
     @unittest.skipIf(sys.platform == "darwin", "skipping, see issue #12958")
-    @unittest.skipIf(sys.platform.startswith("aix"), "skipping, see issue #22397")
+    @unittest.skipIf(AIX, "skipping, see issue #22397")
     def _testFDPassSeparate(self):
         fd0, fd1 = self.newFDs(2)
         self.assertEqual(
@@ -3262,7 +3265,7 @@ class SCMRightsTest(SendrecvmsgServerTimeoutBase):
             len(MSG))
 
     @unittest.skipIf(sys.platform == "darwin", "skipping, see issue #12958")
-    @unittest.skipIf(sys.platform.startswith("aix"), "skipping, see issue #22397")
+    @unittest.skipIf(AIX, "skipping, see issue #22397")
     @requireAttrs(socket, "CMSG_SPACE")
     def testFDPassSeparateMinSpace(self):
         # Pass two FDs in two separate arrays, receiving them into the
@@ -3276,7 +3279,7 @@ class SCMRightsTest(SendrecvmsgServerTimeoutBase):
 
     @testFDPassSeparateMinSpace.client_skip
     @unittest.skipIf(sys.platform == "darwin", "skipping, see issue #12958")
-    @unittest.skipIf(sys.platform.startswith("aix"), "skipping, see issue #22397")
+    @unittest.skipIf(AIX, "skipping, see issue #22397")
     def _testFDPassSeparateMinSpace(self):
         fd0, fd1 = self.newFDs(2)
         self.assertEqual(
@@ -3997,11 +4000,13 @@ class SendrecvmsgSCTPStreamTestBase(SendrecvmsgSCTPFlagsBase,
     pass
 
 @requireAttrs(socket.socket, "sendmsg")
+@unittest.skipIf(AIX, "IPPROTO_SCTP: [Errno 62] Protocol not supported on AIX")
 @requireSocket("AF_INET", "SOCK_STREAM", "IPPROTO_SCTP")
 class SendmsgSCTPStreamTest(SendmsgStreamTests, SendrecvmsgSCTPStreamTestBase):
     pass
 
 @requireAttrs(socket.socket, "recvmsg")
+@unittest.skipIf(AIX, "IPPROTO_SCTP: [Errno 62] Protocol not supported on AIX")
 @requireSocket("AF_INET", "SOCK_STREAM", "IPPROTO_SCTP")
 class RecvmsgSCTPStreamTest(RecvmsgTests, RecvmsgGenericStreamTests,
                             SendrecvmsgSCTPStreamTestBase):
@@ -4015,6 +4020,7 @@ class RecvmsgSCTPStreamTest(RecvmsgTests, RecvmsgGenericStreamTests,
             self.skipTest("sporadic ENOTCONN (kernel issue?) - see issue #13876")
 
 @requireAttrs(socket.socket, "recvmsg_into")
+@unittest.skipIf(AIX, "IPPROTO_SCTP: [Errno 62] Protocol not supported on AIX")
 @requireSocket("AF_INET", "SOCK_STREAM", "IPPROTO_SCTP")
 class RecvmsgIntoSCTPStreamTest(RecvmsgIntoTests, RecvmsgGenericStreamTests,
                                 SendrecvmsgSCTPStreamTestBase):

Misc/NEWS.d/next/Tests/2018-08-14-20-50-07.bpo-11192.g7TwYm.rst

+Fix `test_socket` on AIX
+AIX 6.1 and later IPv6 zone id supports only supported by inet_pton6_zone()
+Switch to runtime-based platform.system() to establish current platform
+ rather than build-time based sys.platform()