libvirt: Add configuration files for mad and default

yaml files for mad and default

Test plan:
    PASS: Create configuration files with all needed data
    PASS: Ensure all data is usable
    PASS: No Pylint/Bashate errors
    PASS: Regression test succeeded

Story: 2010816
Task: 48350

Change-Id: Id7a380a64348501396b139ebb57ff0f42825ffce
Signed-off-by: Bailey Henry <Henry.Bailey@windriver.com>

libvirt/README.rst

@@ -28,8 +28,9 @@ an interactive shell that configures everything.  Here's an example::
 	export EXTERNAL_NETWORK=172.30.20.0/24
 	export EXTERNAL_IP=172.30.20.1/24
 
-There is also a script ``cleanup_network.sh`` that will remove networking
-configuration from libvirt.
+Using ``./readconfig.sh madcloud.yaml`` also sets the madcloud
+environment variables. Use ``default.yaml`` or ``madcloud.yaml`` as
+templates to make custom configurations.
 
 Networking
 ----------
@@ -40,7 +41,11 @@ Set the BRIDGE_INTERFACE environment variable if you need to change stxbr to
 something unique.
 
 The ``destroy_network.sh`` script does the reverse, and should not be used lightly.
-It should also only be used after all of the VMs created below have been destroyed.
+It should also only be used after all of the VMs created below have been
+destroyed.
+
+There is also a script ``cleanup_network.sh`` that will remove networking
+configuration from libvirt.
 
 Controllers
 -----------

libvirt/config.py

@@ -0,0 +1,46 @@
+#!/usr/bin/python3
+
+import sys
+import yaml
+
+def print_help():
+    print("./config.py <config_file> <key>",
+        file=sys.stderr)
+
+def readvalue(config_file, key):
+
+    try:
+        with open(config_file, 'r', encoding="utf-8") as f:
+            data = yaml.load(f, Loader=yaml.Loader)
+
+        value = data[key]
+        print(value)
+
+    except yaml.YAMLError as e:
+        print('YAMLError: %s' % e, file=sys.stderr)
+    except KeyError as e:
+        print('KeyError: %s' % e, file=sys.stderr)
+
+if __name__ == "__main__":
+    args = sys.argv[1:]
+
+    if '--help' in args:
+        print_help()
+        sys.exit(1)
+
+    if len(args) == 2:
+        input_file = args[0]
+        input_key = args[1]
+        readvalue(input_file, input_key)
+
+    elif len(args) < 2:
+        print("Error: missing required arguments.",
+              file=sys.stderr)
+        print_help()
+        sys.exit(1)
+
+    else:
+        print("Error: too many arguments.",
+              file=sys.stderr)
+        print_help()
+        sys.exit(1)

libvirt/default.yaml

@@ -0,0 +1,10 @@
+---
+bridge_interface: stxbr
+ext_network: 10.10.10.0/24
+ext_IP: 10.10.10.1/24
+controller: controller
+worker: worker
+storage: storage
+worker_nodes_num: '1'
+storage_nodes_num: '1'
+domain_dir: 'vms'

libvirt/madcloud.yaml

@@ -0,0 +1,10 @@
+---
+bridge_interface: madbr
+ext_network: 172.30.20.0/24
+ext_IP: 172.30.20.1/24
+controller: madcloud
+worker: madnode
+storage: storage
+worker_nodes_num: '1'
+storage_nodes_num: '1'
+domain_dir: 'vms'

libvirt/readconfig.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+GET_CFG="./config.py $1"
+
+export BRIDGE_INTERFACE="$( ${GET_CFG} bridge_interface )"
+export EXTERNAL_NETWORK="$( ${GET_CFG} ext_network )"
+export EXTERNAL_IP="$( ${GET_CFG} ext_IP )"
+export CONTROLLER="$( ${GET_CFG} controller )"
+export WORKER="$( ${GET_CFG} worker )"
+export STORAGE="$( ${GET_CFG} storage )"
+export WORKER_NODES_NUMBER="$( ${GET_CFG} worker_nodes_num )"
+export STORAGE_NODES_NUMBER="$( ${GET_CFG} storage_nodes_num )"
+export DOMAIN_DIRECTORY="$( ${GET_CFG} domain_dir )"