zdtm.py: Add inhfd tests for --inherit-fd option

This option cannot be tested using classic zdtm tests as it implies
some data created before restore and passed through criu restore down
to the restored process (descriptor in our case).

So add inhfd_test class that creates such.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/inhfd.desc

+{ 'dir': 'inhfd/', 'exclude': [ ] }

test/inhfd/pipe.py

+import os
+
+class pipef:
+	def __init__(self, fd):
+		self.__fd = fd
+
+	def read(self, blen):
+		return os.read(self.__fd, blen)
+
+	def write(self, msg):
+		return os.write(self.__fd, msg)
+
+	def flush(self):
+		pass
+
+	def close(self):
+		os.close(self.__fd)
+		self.__fd = -1
+
+	def fileno(self):
+		return self.__fd
+
+def create_fds():
+	(fd1, fd2) = os.pipe()
+	return (pipef(fd2), pipef(fd1))
+
+def filename(pipef):
+	return 'pipe:[%d]' % os.fstat(pipef.fileno()).st_ino
+
+def dump_opts(sockf):
+	return [ ]

test/inhfd/pipe.py.desc

+{ 'flavor': 'h' }

test/inhfd/socket.py

+import socket
+import os
+
+def create_fds():
+	(sk1, sk2) = socket.socketpair(socket.AF_UNIX, socket.SOCK_STREAM)
+	return (sk1.makefile("w"), sk2.makefile("r"))
+
+def __sock_ino(sockf):
+	return os.fstat(sockf.fileno()).st_ino
+
+def filename(sockf):
+	return 'socket:[%d]' % __sock_ino(sockf)
+
+def dump_opts(sockf):
+	return ['--ext-unix-sk=%d' % __sock_ino(sockf)]

test/inhfd/socket.py.desc

+{ 'flavor': 'h' }

test/zdtm.py

@@ -12,6 +12,10 @@ import signal
 import atexit
 import sys
 import linecache
+import random
+import string
+import imp
+import socket
 
 prev_line = None
 def traceit(f, e, a):
@@ -279,7 +283,86 @@ class zdtm_test:
 			print " <<< " + "=" * 32
 
 
-test_classes = { 'zdtm': zdtm_test }
+class inhfd_test:
+	def __init__(self, name, desc, flavor):
+		self.__name = os.path.basename(name)
+		print "Load %s" % name
+		self.__fdtyp = imp.load_source(self.__name, name)
+		self.__my_file = None
+		self.__peer_pid = 0
+		self.__peer_file = None
+		self.__peer_file_name = None
+		self.__dump_opts = None
+
+	def start(self):
+		self.__message = "".join([random.choice(string.ascii_letters) for _ in range(16)])
+		(self.__my_file, peer_file) = self.__fdtyp.create_fds()
+
+		# Check FDs returned for inter-connection
+		self.__my_file.write(self.__message)
+		self.__my_file.flush()
+		if peer_file.read(16) != self.__message:
+			raise test_fail_exc("FDs screwup")
+
+		start_pipe = os.pipe()
+		self.__peer_pid = os.fork()
+		if self.__peer_pid == 0:
+			os.setsid()
+			os.close(0)
+			os.close(1)
+			os.close(2)
+		 	self.__my_file.close()
+			os.close(start_pipe[0])
+			os.close(start_pipe[1])
+			try:
+				data = peer_file.read(16)
+			except:
+				sys.exit(1)
+
+			sys.exit(data == self.__message and 42 or 2)
+
+		os.close(start_pipe[1])
+		os.read(start_pipe[0], 12)
+		os.close(start_pipe[0])
+
+		self.__peer_file_name = self.__fdtyp.filename(peer_file)
+		self.__dump_opts = self.__fdtyp.dump_opts(peer_file)
+
+	def stop(self):
+		self.__my_file.write(self.__message)
+		self.__my_file.flush()
+		pid, status = os.waitpid(self.__peer_pid, 0)
+		if not os.WIFEXITED(status) or os.WEXITSTATUS(status) != 42:
+			raise test_fail_exc("test failed with %d" % status)
+
+	def kill(self):
+		if self.__peer_pid:
+			os.kill(self.__peer_pid, signal.SIGKILL)
+
+	def getname(self):
+		return self.__name
+
+	def getpid(self):
+		return "%s" % self.__peer_pid
+
+	def gone(self, force = True):
+		os.waitpid(self.__peer_pid, 0)
+		wait_pid_die(self.__peer_pid, self.__name)
+		self.__my_file = None
+		self.__peer_file = None
+
+	def getdopts(self):
+		return self.__dump_opts
+
+	def getropts(self):
+		(self.__my_file, self.__peer_file) = self.__fdtyp.create_fds()
+		return ["--restore-sibling", "--inherit-fd", "fd[%d]:%s" % (self.__peer_file.fileno(), self.__peer_file_name)]
+
+	def print_output(self):
+		pass
+
+
+test_classes = { 'zdtm': zdtm_test, 'inhfd': inhfd_test }
 
 #
 # CRIU when launched using CLI