pungi-koji: add option for not creating latest symbol link

Fixes: #53
Signed-off-by: Qixiang Wan <qwan@redhat.com>

bin/pungi-koji

@@ -119,6 +119,13 @@ def main():
         "--notification-script",
         help="script for sending progress notification messages"
     )
+    parser.add_option(
+        "--no-latest-link",
+        action="store_true",
+        default=False,
+        dest="no_latest_link",
+        help="don't create latest symbol link to this compose"
+    )
 
     opts, args = parser.parse_args()
     import pungi.notifier
@@ -160,6 +167,8 @@ def main():
         abort("please specify a config")
     opts.config = os.path.abspath(opts.config)
 
+    create_latest_link = not opts.no_latest_link
+
     import kobo.conf
     import kobo.log
     import productmd.composeinfo
@@ -210,13 +219,13 @@ def main():
     notifier.compose = compose
     COMPOSE = compose
     try:
-        run_compose(compose)
+        run_compose(compose, create_latest_link)
     except Exception, ex:
         compose.log_error("Compose run failed: %s" % ex)
         raise
 
 
-def run_compose(compose):
+def run_compose(compose, create_latest_link=True):
     import pungi.phases
     import pungi.metadata
 
@@ -390,6 +399,7 @@ def run_compose(compose):
     test_phase.start()
     test_phase.stop()
 
+    if create_latest_link:
         # create a latest symlink
         compose_dir = os.path.basename(compose.topdir)
         if len(compose.conf["release_version"].split(".")) == 1: