packer-cn/builder/amazon/common/ssh.go

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package common
import (
gossh "code.google.com/p/go.crypto/ssh"
"errors"
"fmt"
"github.com/mitchellh/goamz/ec2"
"github.com/mitchellh/packer/communicator/ssh"
"time"
)
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// SSHAddress returns a function that can be given to the SSH communicator
// for determining the SSH address based on the instance DNS name.
func SSHAddress(e *ec2.EC2, port int) func(map[string]interface{}) (string, error) {
return func(state map[string]interface{}) (string, error) {
for j := 0; j < 2; j++ {
var host string
i := state["instance"].(*ec2.Instance)
if i.DNSName != "" {
host = i.DNSName
} else if i.VpcId != "" {
host = i.PrivateIpAddress
}
if host != "" {
return fmt.Sprintf("%s:%d", host, port), nil
}
r, err := e.Instances([]string{i.InstanceId}, ec2.NewFilter())
if err != nil {
return "", err
}
if len(r.Reservations) == 0 || len(r.Reservations[0].Instances) == 0 {
return "", fmt.Errorf("instance not found: %s", i.InstanceId)
}
state["instance"] = &r.Reservations[0].Instances[0]
time.Sleep(1 * time.Second)
}
return "", errors.New("couldn't determine IP address for instance")
}
}
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// SSHConfig returns a function that can be used for the SSH communicator
// config for connecting to the instance created over SSH using the generated
// private key.
func SSHConfig(username string) func(map[string]interface{}) (*gossh.ClientConfig, error) {
return func(state map[string]interface{}) (*gossh.ClientConfig, error) {
privateKey := state["privateKey"].(string)
keyring := new(ssh.SimpleKeychain)
if err := keyring.AddPEMKey(privateKey); err != nil {
return nil, fmt.Errorf("Error setting up SSH config: %s", err)
}
return &gossh.ClientConfig{
User: username,
Auth: []gossh.ClientAuth{
gossh.ClientAuthKeyring(keyring),
},
}, nil
}
}