Bootstrap container for openstack provider (capo)

This patchset provides the Go code and scripts for the
Bootstrap container for Openstack.

The Bootstrap container for Openstack provider accepts
three commands: create, delete and help.
- create - creates an Ephemeral K8S cluster in Openstack
- delete - deletes the Ephemeral K8S cluster in Openstack
- help - Stdout the help text for usage of the bootstrap container.

Documentation is available at bootstrap_capo/README.md

Change-Id: Idd444834070b84170f18561626c487e23a3ca951

bootstrap_capo/main.go

@@ -0,0 +1,85 @@
+/*
+ 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
+
+     https://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.
+*/
+
+package main
+
+import (
+	"capo/config"
+	"log"
+	"os"
+
+	"flag"
+)
+
+const (
+	createCmd = "create"
+	deleteCmd = "delete"
+	helpCmd   = "help"
+)
+
+func main() {
+	var configPath string
+
+	flag.StringVar(&configPath, "c", "", "Path for the Openstack Cloud bootstrap configuration (yaml) file")
+	flag.Parse()
+
+	volMount := os.Getenv("BOOTSTRAP_VOLUME")
+
+	_, dstMount, err := config.GetVolumeMountPoints(volMount)
+
+	if err != nil {
+		log.Printf("Failed to get volume mount, please provide volume mount")
+		os.Exit(1)
+	}
+	openstackConfigPath := dstMount + "/" + os.Getenv("BOOTSTRAP_CONFIG")
+	if len(configPath) == 0 {
+		configPath = openstackConfigPath
+	}
+
+	configYAML := config.OpenstackConfig{}
+	err = config.ReadYAMLFile(configPath, &configYAML)
+	if err != nil {
+		log.Printf("Failed to load Openstack Cloud Bootstrap config file")
+		os.Exit(2)
+	}
+
+	err = config.SetOpenstackCloudEnvVars(&configYAML)
+	if err != nil {
+		log.Printf("Failed to set Openstack Cloud environment variables")
+		os.Exit(3)
+	}
+
+	command := os.Getenv("BOOTSTRAP_COMMAND")
+	switch {
+	case command == createCmd:
+		err = config.CreateOSCluster()
+		if err != nil {
+			os.Exit(4)
+		}
+	case command == deleteCmd:
+		err = config.DeleteOSCluster()
+		if err != nil {
+			os.Exit(5)
+		}
+	case command == helpCmd:
+		err = config.HelpOSCluster()
+		if err != nil {
+			os.Exit(6)
+		}
+	default:
+		log.Printf("The --command parameter value shall be 'create', 'delete' or 'help'")
+		os.Exit(7)
+	}
+	os.Exit(0)
+}