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vm.go
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vm.go
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package cmd
import (
"bytes"
"compress/gzip"
"encoding/base64"
"errors"
"fmt"
"io/ioutil"
"log"
"os"
"path"
"github.com/exoscale/egoscale"
"github.com/spf13/cobra"
)
const (
defaultServiceOffering = "medium"
maxUserDataLength = 32768
)
var vmCmd = &cobra.Command{
Use: "vm",
Short: "Compute instances management",
}
func getVirtualMachineByNameOrID(name string) (*egoscale.VirtualMachine, error) {
vmQuery := egoscale.VirtualMachine{}
id, err := egoscale.ParseUUID(name)
if err != nil {
vmQuery.Name = name
} else {
vmQuery.ID = id
}
vms, err := cs.ListWithContext(gContext, vmQuery)
if err != nil {
return nil, err
}
var vm *egoscale.VirtualMachine
switch len(vms) {
case 0:
return nil, fmt.Errorf("Compute instance %q not found", name) // nolint
case 1:
vm = vms[0].(*egoscale.VirtualMachine)
default:
names := []string{}
for _, i := range vms {
v := i.(*egoscale.VirtualMachine)
if v.Name != vmQuery.Name {
continue
}
vm = v
names = append(names, fmt.Sprintf("\t%s\t%s\t%s", v.ID.String(), v.ZoneName, v.IP()))
}
if len(names) == 1 {
break
}
return nil, errors.New("multiple Compute instances found, specify an ID instead")
}
return vm, nil
}
func getKeyPairPath(vmID string) string {
return path.Join(gConfigFolder, "instances", vmID, "id_rsa")
}
func saveKeyPair(keyPairs *egoscale.SSHKeyPair, vmID egoscale.UUID) {
filePath := getKeyPairPath(vmID.String())
folder := path.Dir(filePath)
if _, err := os.Stat(folder); os.IsNotExist(err) {
if err := os.MkdirAll(folder, os.ModePerm); err != nil {
log.Fatal(err)
}
}
if _, err := os.Stat(filePath); os.IsNotExist(err) {
if err := ioutil.WriteFile(filePath, []byte(keyPairs.PrivateKey), 0o600); err != nil {
log.Fatalf("SSH private key could not be written: %s", err)
}
}
}
func getUserDataFromFile(path string) (string, error) {
data, err := ioutil.ReadFile(path)
if err != nil {
return "", err
}
userData, err := encodeUserData(data)
if err != nil {
return "", err
}
if len(userData) >= maxUserDataLength {
return "", fmt.Errorf("user-data maximum allowed length is %d bytes", maxUserDataLength)
}
return userData, nil
}
func encodeUserData(data []byte) (string, error) {
b := new(bytes.Buffer)
gz := gzip.NewWriter(b)
if _, err := gz.Write(data); err != nil {
return "", err
}
if err := gz.Flush(); err != nil {
return "", err
}
if err := gz.Close(); err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(b.Bytes()), nil
}
func decodeUserData(data string) (string, error) {
base64Decoded, err := base64.StdEncoding.DecodeString(data)
if err != nil {
return "", err
}
gz, err := gzip.NewReader(bytes.NewReader(base64Decoded))
if err != nil {
// User data are not compressed, returning as-is.
if errors.Is(err, gzip.ErrHeader) {
return string(base64Decoded), nil
}
return "", err
}
defer gz.Close()
userData, err := ioutil.ReadAll(gz)
if err != nil {
return "", err
}
return string(userData), nil
}
func init() {
RootCmd.AddCommand(vmCmd)
}