Fix neo log rotation

See merge request nexedi/erp5!1786

product/ERP5/bin/zopewsgi.py

 import six
 import argparse
+import atexit
 from io import BytesIO
 import logging
 import os
@@ -176,6 +177,7 @@ def runwsgi():
     parser.add_argument('zope_conf', help='path to zope.conf')
     parser.add_argument('--timerserver-interval', help='Interval for timerserver', type=float)
     parser.add_argument('--threads', help='Number of threads', default=4, type=int)
+    parser.add_argument('--pidfile', help='Write process id in file')
     parser.add_argument(
       '--large-file-threshold',
       help='Requests bigger than this size in bytes get saved into a temporary file '
@@ -184,13 +186,6 @@ def runwsgi():
       default=type_registry.get('byte-size')("10MB"))
     args = parser.parse_args()
 
-    startup = os.path.dirname(Zope2.Startup.__file__)
-    if os.path.isfile(os.path.join(startup, 'wsgischema.xml')):
-      schema = ZConfig.loadSchema(os.path.join(startup, 'wsgischema.xml'))
-    else: # BBB Zope2
-      schema = ZConfig.loadSchema(os.path.join(startup, 'zopeschema.xml'))
-    conf, _ = ZConfig.loadConfig(schema, args.zope_conf)
-
     # Configure logging previously handled by ZConfig/ZServer
     logging.captureWarnings(True)
     root_logger = logging.getLogger()
@@ -221,6 +216,18 @@ def runwsgi():
       LongRequestLogger_dumper.logger.propagate = False
       LongRequestLogger_dumper.logger.addHandler(long_request_log_handler)
 
+    if args.pidfile:
+      with open(args.pidfile, 'w') as f:
+        f.write('%s\n' % os.getpid())
+      atexit.register(os.unlink, args.pidfile)
+
+    startup = os.path.dirname(Zope2.Startup.__file__)
+    if os.path.isfile(os.path.join(startup, 'wsgischema.xml')):
+      schema = ZConfig.loadSchema(os.path.join(startup, 'wsgischema.xml'))
+    else: # BBB Zope2
+      schema = ZConfig.loadSchema(os.path.join(startup, 'zopeschema.xml'))
+    conf, _ = ZConfig.loadConfig(schema, args.zope_conf)
+
     if conf.debug_mode:
       console_handler = logging.StreamHandler(sys.stderr)
       console_handler.setFormatter(logging.Formatter(