github.com/kaixiang/packer@v0.5.2-0.20140114230416-1f5786b0d7f1/builder/amazon/common/ssh.go (about)

     1  package common
     2  
     3  import (
     4  	gossh "code.google.com/p/go.crypto/ssh"
     5  	"errors"
     6  	"fmt"
     7  	"github.com/mitchellh/goamz/ec2"
     8  	"github.com/mitchellh/multistep"
     9  	"github.com/mitchellh/packer/communicator/ssh"
    10  	"time"
    11  )
    12  
    13  // SSHAddress returns a function that can be given to the SSH communicator
    14  // for determining the SSH address based on the instance DNS name.
    15  func SSHAddress(e *ec2.EC2, port int) func(multistep.StateBag) (string, error) {
    16  	return func(state multistep.StateBag) (string, error) {
    17  		for j := 0; j < 2; j++ {
    18  			var host string
    19  			i := state.Get("instance").(*ec2.Instance)
    20  			if i.DNSName != "" {
    21  				host = i.DNSName
    22  			} else if i.VpcId != "" {
    23  				if i.PublicIpAddress != "" {
    24  					host = i.PublicIpAddress
    25  				} else {
    26  					host = i.PrivateIpAddress
    27  				}
    28  			}
    29  
    30  			if host != "" {
    31  				return fmt.Sprintf("%s:%d", host, port), nil
    32  			}
    33  
    34  			r, err := e.Instances([]string{i.InstanceId}, ec2.NewFilter())
    35  			if err != nil {
    36  				return "", err
    37  			}
    38  
    39  			if len(r.Reservations) == 0 || len(r.Reservations[0].Instances) == 0 {
    40  				return "", fmt.Errorf("instance not found: %s", i.InstanceId)
    41  			}
    42  
    43  			state.Put("instance", &r.Reservations[0].Instances[0])
    44  			time.Sleep(1 * time.Second)
    45  		}
    46  
    47  		return "", errors.New("couldn't determine IP address for instance")
    48  	}
    49  }
    50  
    51  // SSHConfig returns a function that can be used for the SSH communicator
    52  // config for connecting to the instance created over SSH using the generated
    53  // private key.
    54  func SSHConfig(username string) func(multistep.StateBag) (*gossh.ClientConfig, error) {
    55  	return func(state multistep.StateBag) (*gossh.ClientConfig, error) {
    56  		privateKey := state.Get("privateKey").(string)
    57  
    58  		keyring := new(ssh.SimpleKeychain)
    59  		if err := keyring.AddPEMKey(privateKey); err != nil {
    60  			return nil, fmt.Errorf("Error setting up SSH config: %s", err)
    61  		}
    62  
    63  		return &gossh.ClientConfig{
    64  			User: username,
    65  			Auth: []gossh.ClientAuth{
    66  				gossh.ClientAuthKeyring(keyring),
    67  			},
    68  		}, nil
    69  	}
    70  }