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step_create_ssh_key.go
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step_create_ssh_key.go
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package digitalocean
import (
"cgl.tideland.biz/identifier"
"code.google.com/p/go.crypto/ssh"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/hex"
"encoding/pem"
"fmt"
"github.com/mitchellh/multistep"
"github.com/mitchellh/packer/packer"
"log"
)
type stepCreateSSHKey struct {
keyId uint
}
func (s *stepCreateSSHKey) Run(state multistep.StateBag) multistep.StepAction {
client := state.Get("client").(*DigitalOceanClient)
ui := state.Get("ui").(packer.Ui)
ui.Say("Creating temporary ssh key for droplet...")
priv, err := rsa.GenerateKey(rand.Reader, 2014)
// ASN.1 DER encoded form
priv_der := x509.MarshalPKCS1PrivateKey(priv)
priv_blk := pem.Block{
Type: "RSA PRIVATE KEY",
Headers: nil,
Bytes: priv_der,
}
// Set the private key in the statebag for later
state.Put("privateKey", string(pem.EncodeToMemory(&priv_blk)))
// Marshal the public key into SSH compatible format
// TODO properly handle the public key error
pub, _ := ssh.NewPublicKey(&priv.PublicKey)
pub_sshformat := string(ssh.MarshalAuthorizedKey(pub))
// The name of the public key on DO
name := fmt.Sprintf("packer-%s", hex.EncodeToString(identifier.NewUUID().Raw()))
// Create the key!
keyId, err := client.CreateKey(name, pub_sshformat)
if err != nil {
err := fmt.Errorf("Error creating temporary SSH key: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
// We use this to check cleanup
s.keyId = keyId
log.Printf("temporary ssh key name: %s", name)
// Remember some state for the future
state.Put("ssh_key_id", keyId)
return multistep.ActionContinue
}
func (s *stepCreateSSHKey) Cleanup(state multistep.StateBag) {
// If no key name is set, then we never created it, so just return
if s.keyId == 0 {
return
}
client := state.Get("client").(*DigitalOceanClient)
ui := state.Get("ui").(packer.Ui)
c := state.Get("config").(config)
ui.Say("Deleting temporary ssh key...")
err := client.DestroyKey(s.keyId)
curlstr := fmt.Sprintf("curl '%v/ssh_keys/%v/destroy?client_id=%v&api_key=%v'",
DIGITALOCEAN_API_URL, s.keyId, c.ClientID, c.APIKey)
if err != nil {
log.Printf("Error cleaning up ssh key: %v", err.Error())
ui.Error(fmt.Sprintf(
"Error cleaning up ssh key. Please delete the key manually: %v", curlstr))
}
}