CSIT-687: Directory structure reorganization

[csit.git] / resources / tools / scripts / topo_reservation.py

diff --git a/resources/tools/scripts/topo_reservation.py b/resources/tools/scripts/topo_reservation.py
new file mode 100755 (executable)
index 0000000..4b5ed24
--- /dev/null
+++ b/resources/tools/scripts/topo_reservation.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2016 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""This script provides simple reservation mechanism to avoid
+   simultaneous use of nodes listed in topology file.
+   As source of truth is used DUT1 node from the topology file."""
+
+import sys
+import argparse
+from resources.libraries.python.ssh import SSH
+from yaml import load
+
+RESERVATION_DIR = "/tmp/reservation_dir"
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("-t", "--topo", required=True,
+                        help="Topology file")
+    parser.add_argument("-c", "--cancel", help="Cancel reservation",
+                        action="store_true")
+    args = parser.parse_args()
+    topology_file = args.topo
+    cancel_reservation = args.cancel
+
+    work_file = open(topology_file)
+    topology = load(work_file.read())['nodes']
+
+    #we are using DUT1 node because we expect DUT1 to be a linux host
+    #we don't use TG because we don't expect TG to be linux only host
+    try:
+        tg_node = topology["DUT1"]
+    except KeyError:
+        print "Topology file does not contain 'DUT1' node"
+        return 1
+
+    ssh = SSH()
+    ssh.connect(tg_node)
+
+    #For system reservation we use mkdir it is an atomic operation and we can
+    #store additional data (time, client_ID, ..) within reservation directory
+    if cancel_reservation:
+        ret, _, err = ssh.exec_command("rm -r {}".format(RESERVATION_DIR))
+    else:
+        ret, _, err = ssh.exec_command("mkdir {}".format(RESERVATION_DIR))
+
+    if ret != 0:
+        print("{} unsuccessful:\n{}".
+              format(("Cancellation " if cancel_reservation else "Reservation"),
+                     err))
+    return ret
+
+if __name__ == "__main__":
+    sys.exit(main())