add modify command to modify hw specs

cmd/modify.go

@@ -0,0 +1,80 @@
+/*
+Copyright © 2020 NAME HERE <EMAIL ADDRESS>
+
+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 (
+	"errors"
+	"fmt"
+	"github.com/mhewedy/vermin/vms"
+	"github.com/spf13/cobra"
+	"os"
+)
+
+// modifyCmd represents the modify command
+var modifyCmd = &cobra.Command{
+	Use:   "modify",
+	Short: "Modify a VM HW specs (cpu, memory)",
+	Long:  "Modify a VM HW specs (cpu, memory)",
+	Example: `
+
+To change the VM to use 2 cores and 512MB memory
+$ vermin modify vm_01 --cpus 2 --mem 512
+`,
+	Run: func(cmd *cobra.Command, args []string) {
+		vmName := args[0]
+		var script string
+		if len(args) > 1 {
+			script = args[1]
+			checkFilePath(script)
+		}
+		cpus, _ := cmd.Flags().GetInt("cpus")
+		mem, _ := cmd.Flags().GetInt("mem")
+
+		if err := vms.Modify(vmName, cpus, mem); err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+	},
+	Args: func(cmd *cobra.Command, args []string) error {
+		if len(args) < 1 {
+			return errors.New("vm required")
+		}
+
+		cpus, _ := cmd.Flags().GetInt("cpus")
+		mem, _ := cmd.Flags().GetInt("mem")
+
+		if cpus == 0 && mem == 0 {
+			return errors.New("should specify cpus and/or mem specs")
+		}
+		return nil
+	},
+	ValidArgsFunction: listImages,
+}
+
+func init() {
+	rootCmd.AddCommand(modifyCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// modifyCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	modifyCmd.Flags().IntP("cpus", "c", 0, "Number of cpu cores")
+	modifyCmd.Flags().IntP("mem", "m", 0, "Memory size in mega bytes")
+}

vms/vms.go

@@ -25,6 +25,10 @@ func Start(vmName string) error {
 		return err
 	}
 
+	if isRunningVM(vmName) {
+		return fmt.Errorf(`VM already running, use "vermin ssh %s" to ssh into the VM.`, vmName)
+	}
+
 	if err := start(vmName); err != nil {
 		return err
 	}
@@ -136,3 +140,20 @@ func IP(vmName string, purge bool, global bool) (string, error) {
 	}
 	return ip.Find(vmName, purge)
 }
+
+func Modify(vmName string, cpus int, mem int) error {
+	if isRunningVM(vmName) {
+		return fmt.Errorf(`Cannot Modify running VM, use "vermin stop %s" to stop the VM first.`, vmName)
+	}
+
+	var params = []string{"modifyvm", vmName}
+	if cpus > 0 {
+		params = append(params, "--cpus", fmt.Sprintf("%d", cpus))
+	}
+	if mem > 0 {
+		params = append(params, "--memory", fmt.Sprintf("%d", mem))
+	}
+
+	_, err := command.VBoxManage(params...).Call()
+	return err
+}