Function checkAndUpdateOldKeyPair

pkg/cmd/codespace/ssh.go:426–468

checkAndUpdateOldKeyPair handles backward compatibility with the old keypair names. If the old public and private keys both exist they are renamed to the new name. The return value is non-nil only if the rename happens.

(sshContext ssh.Context)

// If the old public and private keys both exist they are renamed to the new name.
// The return value is non-nil only if the rename happens.
func checkAndUpdateOldKeyPair(sshContext ssh.Context) *ssh.KeyPair {
	publicKeys, err := sshContext.LocalPublicKeys()
	if err != nil {
		return nil
	}

	for _, publicKey := range publicKeys {
		if filepath.Base(publicKey) != automaticPrivateKeyNameOld+".pub" {
			continue
		}

		privateKey := strings.TrimSuffix(publicKey, ".pub")
		_, err := os.Stat(privateKey)
		if err != nil {
			continue
		}

		// Both old public and private keys exist, rename them to the new name

		sshDir := filepath.Dir(publicKey)

		publicKeyNew := filepath.Join(sshDir, automaticPrivateKeyName+".pub")
		err = os.Rename(publicKey, publicKeyNew)
		if err != nil {
			return nil
		}

		privateKeyNew := filepath.Join(sshDir, automaticPrivateKeyName)
		err = os.Rename(privateKey, privateKeyNew)
		if err != nil {
			return nil
		}

		keyPair := &ssh.KeyPair{
			PublicKeyPath:  publicKeyNew,
			PrivateKeyPath: privateKeyNew,
		}

		return keyPair
	}

	return nil
}

// firstConfiguredKeyPair reads the effective configuration for a localhost
// connection and returns the first valid key pair which would be tried for authentication