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//go:build amd64 || arm64
// +build amd64 arm64
package machine
import (
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/sirupsen/logrus"
)
var sshCommand = []string{"ssh-keygen", "-N", "", "-t", "ed25519", "-f"}
// CreateSSHKeys makes a priv and pub ssh key for interacting
// the a VM.
func CreateSSHKeys(writeLocation string) (string, error) {
if err := os.MkdirAll(filepath.Dir(writeLocation), 0700); err != nil {
return "", err
}
if err := generatekeys(writeLocation); err != nil {
return "", err
}
b, err := ioutil.ReadFile(writeLocation + ".pub")
if err != nil {
return "", err
}
return strings.TrimSuffix(string(b), "\n"), nil
}
func CreateSSHKeysPrefix(dir string, file string, passThru bool, skipExisting bool, prefix ...string) (string, error) {
location := filepath.Join(dir, file)
_, e := os.Stat(location)
if !skipExisting || errors.Is(e, os.ErrNotExist) {
if err := generatekeysPrefix(dir, file, passThru, prefix...); err != nil {
return "", err
}
} else {
fmt.Println("Keys already exist, reusing")
}
b, err := ioutil.ReadFile(filepath.Join(dir, file) + ".pub")
if err != nil {
return "", err
}
return strings.TrimSuffix(string(b), "\n"), nil
}
// generatekeys creates an ed25519 set of keys
func generatekeys(writeLocation string) error {
args := append(append([]string{}, sshCommand[1:]...), writeLocation)
cmd := exec.Command(sshCommand[0], args...)
stdErr, err := cmd.StderrPipe()
if err != nil {
return err
}
if err := cmd.Start(); err != nil {
return err
}
waitErr := cmd.Wait()
if waitErr == nil {
return nil
}
errMsg, err := io.ReadAll(stdErr)
if err != nil {
return fmt.Errorf("key generation failed, unable to read from stderr: %w", waitErr)
}
return fmt.Errorf("failed to generate keys: %s: %w", string(errMsg), waitErr)
}
// generatekeys creates an ed25519 set of keys
func generatekeysPrefix(dir string, file string, passThru bool, prefix ...string) error {
args := append([]string{}, prefix[1:]...)
args = append(args, sshCommand...)
args = append(args, file)
binary, err := exec.LookPath(prefix[0])
if err != nil {
return err
}
binary, err = filepath.Abs(binary)
if err != nil {
return err
}
cmd := exec.Command(binary, args...)
cmd.Dir = dir
if passThru {
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
}
logrus.Debugf("Running wsl cmd %v in dir: %s", args, dir)
return cmd.Run()
}
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