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root.go
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root.go
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// Copyright © 2017 The virtual-kubelet authors
//
// 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.
package cmd
import (
"fmt"
"log"
"os"
"path/filepath"
"strings"
homedir "github.com/mitchellh/go-homedir"
"github.com/spf13/cobra"
"github.com/spf13/viper"
"github.com/virtual-kubelet/virtual-kubelet/providers"
vkubelet "github.com/virtual-kubelet/virtual-kubelet/vkubelet"
corev1 "k8s.io/api/core/v1"
)
var kubeletConfig string
var kubeConfig string
var kubeNamespace string
var nodeName string
var operatingSystem string
var provider string
var providerConfig string
var taint string
// RootCmd represents the base command when called without any subcommands
var RootCmd = &cobra.Command{
Use: "virtual-kubelet",
Short: "virtual-kubelet provides a virtual kubelet interface for your kubernetes cluster.",
Long: `virtual-kubelet implements the Kubelet interface with a pluggable
backend implementation allowing users to create kubernetes nodes without running the kubelet.
This allows users to schedule kubernetes workloads on nodes that aren't running Kubernetes.`,
Run: func(cmd *cobra.Command, args []string) {
fmt.Println(kubeConfig)
f, err := vkubelet.New(nodeName, operatingSystem, kubeNamespace, kubeConfig, taint, provider, providerConfig)
if err != nil {
log.Fatal(err)
}
f.Run()
},
}
// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
if err := RootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
func init() {
cobra.OnInitialize(initConfig)
// Here you will define your flags and configuration settings.
// Cobra supports persistent flags, which, if defined here,
// will be global for your application.
//RootCmd.PersistentFlags().StringVar(&kubeletConfig, "config", "", "config file (default is $HOME/.virtual-kubelet.yaml)")
RootCmd.PersistentFlags().StringVar(&kubeConfig, "kubeconfig", "", "config file (default is $HOME/.kube/config)")
RootCmd.PersistentFlags().StringVar(&kubeNamespace, "namespace", "", "kubernetes namespace (default is 'all')")
RootCmd.PersistentFlags().StringVar(&nodeName, "nodename", "virtual-kubelet", "kubernetes node name")
RootCmd.PersistentFlags().StringVar(&operatingSystem, "os", "Linux", "Operating System (Linux/Windows)")
RootCmd.PersistentFlags().StringVar(&provider, "provider", "", "cloud provider")
RootCmd.PersistentFlags().StringVar(&taint, "taint", "", "apply taint to node, making scheduling explicit")
RootCmd.PersistentFlags().StringVar(&providerConfig, "provider-config", "", "cloud provider configuration file")
// Cobra also supports local flags, which will only run
// when this action is called directly.
// RootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
if provider == "" {
fmt.Println("You must supply a cloud provider option: use --provider")
os.Exit(1)
}
// Find home directory.
home, err := homedir.Dir()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
if kubeletConfig != "" {
// Use config file from the flag.
viper.SetConfigFile(kubeletConfig)
} else {
// Search config in home directory with name ".virtual-kubelet" (without extension).
viper.AddConfigPath(home)
viper.SetConfigName(".virtual-kubelet")
}
viper.AutomaticEnv() // read in environment variables that match
// If a config file is found, read it in.
if err := viper.ReadInConfig(); err == nil {
fmt.Println("Using config file:", viper.ConfigFileUsed())
}
if kubeConfig == "" {
kubeConfig = filepath.Join(home, ".kube", "config")
}
if kubeNamespace == "" {
kubeNamespace = corev1.NamespaceAll
}
// Validate operating system.
ok, _ := providers.ValidOperatingSystems[operatingSystem]
if !ok {
fmt.Printf("Operating system '%s' not supported. Valid options are %s\n", operatingSystem, strings.Join(providers.ValidOperatingSystems.Names(), " | "))
os.Exit(1)
}
}