gsyncd: python3 compat fixes

Also add __codecheck script which can verify if source is OK at the
syntactical level with a given Python interpreter.

Change-Id: Ieff34bcd3efd1cdc0e8f9a510c05488f35897bbe
BUG: 1570
Reviewed-on: http://review.gluster.com/320
Reviewed-by: Kaushik BV <kaushikbv@gluster.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>

xlators/features/marker/utils/syncdaemon/__codecheck.py

@@ -0,0 +1,27 @@
+import os
+import os.path
+import sys
+
+fl = os.listdir(os.path.dirname(sys.argv[0]) or '.')
+fl.sort()
+for f in fl:
+    if f[-3:] != '.py' or f[0] == '_':
+        continue
+    m = f[:-3]
+    sys.stdout.write('importing %s ...' %  m)
+    __import__(m)
+    print(' OK.')
+
+def sys_argv_set(a):
+    sys.argv = sys.argv[:1] + a
+
+gsyncd = sys.modules['gsyncd']
+for a in [['--help'], ['--version'], ['--canonicalize-escape-url', '/foo']]:
+    print('>>> invoking program with args: %s' % ' '.join(a))
+    pid = os.fork()
+    if not pid:
+        sys_argv_set(a)
+        gsyncd.main()
+    _, r = os.waitpid(pid, 0)
+    if r:
+        raise RuntimeError('invocation failed')

xlators/features/marker/utils/syncdaemon/configinterface.py

@@ -173,7 +173,7 @@ class GConffile(object):
             opt = norm(opt)
             v = d.get(opt)
             if v:
-                print v
+                print(v)
         else:
             for k, v in d.iteritems():
                 if k == '__name__':

xlators/features/marker/utils/syncdaemon/master.py

@@ -110,7 +110,7 @@ class GMaster(object):
         self.volinfo_state = (uuid_preset and {'uuid': uuid_preset}, None)
         # the actual volinfo we make use of
         self.volinfo = None
-	self.terminate = False
+        self.terminate = False
 
     def crawl_loop(self):
         """start the keep-alive thread and iterate .crawl"""

xlators/features/marker/utils/syncdaemon/syncdutils.py

@@ -8,7 +8,11 @@ from threading import Lock, Thread as baseThread
 from errno import EACCES, EAGAIN, EPIPE, ENOTCONN
 from signal import SIGTERM, SIGKILL
 from time import sleep
-from cPickle import PickleError
+try:
+    from cPickle import PickleError
+except ImportError:
+    # py 3
+    from pickle import PickleError
 
 from gconf import gconf
 
@@ -184,7 +188,7 @@ class FreeObject(object):
     """wildcard class for which any attribute can be set"""
 
     def __init__(self, **kw):
-        for k,v in kw.iteritems():
+        for k,v in kw.items():
             setattr(self, k, v)
 
 class Thread(baseThread):
@@ -210,5 +214,5 @@ class Thread(baseThread):
         baseThread.__init__(self, *a, **kw)
         self.setDaemon(True)
 
-class GsyncdError(StandardError):
+class GsyncdError(Exception):
     pass