152 lines
3.4 KiB
Go
152 lines
3.4 KiB
Go
package amazonebs
|
|
|
|
import (
|
|
gossh "code.google.com/p/go.crypto/ssh"
|
|
"errors"
|
|
"fmt"
|
|
"github.com/mitchellh/goamz/ec2"
|
|
"github.com/mitchellh/multistep"
|
|
"github.com/mitchellh/packer/communicator/ssh"
|
|
"github.com/mitchellh/packer/packer"
|
|
"log"
|
|
"net"
|
|
"time"
|
|
)
|
|
|
|
type stepConnectSSH struct {
|
|
cancel bool
|
|
conn net.Conn
|
|
}
|
|
|
|
func (s *stepConnectSSH) Run(state map[string]interface{}) multistep.StepAction {
|
|
config := state["config"].(config)
|
|
ui := state["ui"].(packer.Ui)
|
|
|
|
var comm packer.Communicator
|
|
var err error
|
|
|
|
waitDone := make(chan bool, 1)
|
|
go func() {
|
|
comm, err = s.waitForSSH(state)
|
|
waitDone <- true
|
|
}()
|
|
|
|
log.Printf("Waiting for SSH, up to timeout: %s", config.SSHTimeout.String())
|
|
|
|
timeout := time.After(config.SSHTimeout)
|
|
WaitLoop:
|
|
for {
|
|
// Wait for either SSH to become available, a timeout to occur,
|
|
// or an interrupt to come through.
|
|
select {
|
|
case <-waitDone:
|
|
if err != nil {
|
|
ui.Error(fmt.Sprintf("Error waiting for SSH: %s", err))
|
|
return multistep.ActionHalt
|
|
}
|
|
|
|
state["communicator"] = comm
|
|
break WaitLoop
|
|
case <-timeout:
|
|
ui.Error("Timeout waiting for SSH.")
|
|
s.cancel = true
|
|
return multistep.ActionHalt
|
|
case <-time.After(1 * time.Second):
|
|
if _, ok := state[multistep.StateCancelled]; ok {
|
|
log.Println("Interrupt detected, quitting waiting for SSH.")
|
|
return multistep.ActionHalt
|
|
}
|
|
}
|
|
}
|
|
|
|
return multistep.ActionContinue
|
|
}
|
|
|
|
func (s *stepConnectSSH) Cleanup(map[string]interface{}) {
|
|
if s.conn != nil {
|
|
s.conn.Close()
|
|
s.conn = nil
|
|
}
|
|
}
|
|
|
|
// This blocks until SSH becomes available, and sends the communicator
|
|
// on the given channel.
|
|
func (s *stepConnectSSH) waitForSSH(state map[string]interface{}) (packer.Communicator, error) {
|
|
config := state["config"].(config)
|
|
instance := state["instance"].(*ec2.Instance)
|
|
privateKey := state["privateKey"].(string)
|
|
ui := state["ui"].(packer.Ui)
|
|
|
|
// Build the keyring for authentication. This stores the private key
|
|
// we'll use to authenticate.
|
|
keyring := &ssh.SimpleKeychain{}
|
|
err := keyring.AddPEMKey(privateKey)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Error setting up SSH config: %s", err)
|
|
}
|
|
|
|
ui.Say("Waiting for SSH to become available...")
|
|
var comm packer.Communicator
|
|
var nc net.Conn
|
|
for {
|
|
if nc != nil {
|
|
nc.Close()
|
|
}
|
|
|
|
time.Sleep(5 * time.Second)
|
|
|
|
if s.cancel {
|
|
log.Println("SSH wait cancelled. Exiting loop.")
|
|
return nil, errors.New("SSH wait cancelled")
|
|
}
|
|
|
|
// Attempt to connect to SSH port
|
|
log.Printf(
|
|
"Opening TCP conn for SSH to %s:%d",
|
|
instance.DNSName, config.SSHPort)
|
|
nc, err := net.Dial("tcp",
|
|
fmt.Sprintf("%s:%d", instance.DNSName, config.SSHPort))
|
|
if err != nil {
|
|
log.Printf("TCP connection to SSH ip/port failed: %s", err)
|
|
continue
|
|
}
|
|
|
|
// Build the actual SSH client configuration
|
|
sshConfig := &gossh.ClientConfig{
|
|
User: config.SSHUsername,
|
|
Auth: []gossh.ClientAuth{
|
|
gossh.ClientAuthKeyring(keyring),
|
|
},
|
|
}
|
|
|
|
sshConnectSuccess := make(chan bool, 1)
|
|
go func() {
|
|
comm, err = ssh.New(nc, sshConfig)
|
|
if err != nil {
|
|
log.Printf("SSH connection fail: %s", err)
|
|
sshConnectSuccess <- false
|
|
return
|
|
}
|
|
|
|
sshConnectSuccess <- true
|
|
}()
|
|
|
|
select {
|
|
case success := <-sshConnectSuccess:
|
|
if !success {
|
|
continue
|
|
}
|
|
case <-time.After(5 * time.Second):
|
|
log.Printf("SSH handshake timeout. Trying again.")
|
|
continue
|
|
}
|
|
|
|
ui.Say("Connected via SSH!")
|
|
break
|
|
}
|
|
|
|
// Store the connection so we can close it later
|
|
s.conn = nc
|
|
return comm, nil
|
|
}
|