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provisioner.go
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provisioner.go
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package ansible
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"net"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"sync"
"golang.org/x/crypto/ssh"
"github.com/mitchellh/packer/common"
"github.com/mitchellh/packer/helper/config"
"github.com/mitchellh/packer/packer"
"github.com/mitchellh/packer/template/interpolate"
)
type Config struct {
common.PackerConfig `mapstructure:",squash"`
ctx interpolate.Context
// The command to run ansible
Command string
// Extra options to pass to the ansible command
ExtraArguments []string `mapstructure:"extra_arguments"`
// The main playbook file to execute.
PlaybookFile string `mapstructure:"playbook_file"`
LocalPort string `mapstructure:"local_port"`
SSHHostKeyFile string `mapstructure:"ssh_host_key_file"`
SSHAuthorizedKeyFile string `mapstructure:"ssh_authorized_key_file"`
SFTPCmd string `mapstructure:"sftp_command"`
inventoryFile string
}
type Provisioner struct {
config Config
adapter *adapter
done chan struct{}
}
func (p *Provisioner) Prepare(raws ...interface{}) error {
p.done = make(chan struct{})
err := config.Decode(&p.config, &config.DecodeOpts{
Interpolate: true,
InterpolateContext: &p.config.ctx,
InterpolateFilter: &interpolate.RenderFilter{
Exclude: []string{},
},
}, raws...)
if err != nil {
return err
}
// Defaults
if p.config.Command == "" {
p.config.Command = "ansible-playbook"
}
var errs *packer.MultiError
err = validateFileConfig(p.config.PlaybookFile, "playbook_file", true)
if err != nil {
errs = packer.MultiErrorAppend(errs, err)
}
err = validateFileConfig(p.config.SSHAuthorizedKeyFile, "ssh_authorized_key_file", true)
if err != nil {
errs = packer.MultiErrorAppend(errs, err)
}
// Check that the host key file exists, if configured
if len(p.config.SSHHostKeyFile) > 0 {
err = validateFileConfig(p.config.SSHHostKeyFile, "ssh_host_key_file", true)
if err != nil {
log.Println(p.config.SSHHostKeyFile, "does not exist")
errs = packer.MultiErrorAppend(errs, err)
}
}
if len(p.config.LocalPort) > 0 {
if _, err := strconv.ParseUint(p.config.LocalPort, 10, 16); err != nil {
errs = packer.MultiErrorAppend(errs, fmt.Errorf("local_port: %s must be a valid port", p.config.LocalPort))
}
} else {
p.config.LocalPort = "0"
}
if errs != nil && len(errs.Errors) > 0 {
return errs
}
return nil
}
func (p *Provisioner) Provision(ui packer.Ui, comm packer.Communicator) error {
ui.Say("Provisioning with Ansible...")
pubKeyBytes, err := ioutil.ReadFile(p.config.SSHAuthorizedKeyFile)
if err != nil {
return errors.New("Failed to load authorized key file")
}
public, _, _, _, err := ssh.ParseAuthorizedKey(pubKeyBytes)
if err != nil {
return errors.New("Failed to parse authorized key")
}
keyChecker := ssh.CertChecker{
UserKeyFallback: func(conn ssh.ConnMetadata, pubKey ssh.PublicKey) (*ssh.Permissions, error) {
if user := conn.User(); user != "packer-ansible" {
ui.Say(fmt.Sprintf("%s is not a valid user", user))
return nil, errors.New("authentication failed")
}
if !bytes.Equal(public.Marshal(), pubKey.Marshal()) {
ui.Say("unauthorized key")
return nil, errors.New("authentication failed")
}
return nil, nil
},
}
config := &ssh.ServerConfig{
AuthLogCallback: func(conn ssh.ConnMetadata, method string, err error) {
ui.Say(fmt.Sprintf("authentication attempt from %s to %s as %s using %s", conn.RemoteAddr(), conn.LocalAddr(), conn.User(), method))
},
PublicKeyCallback: keyChecker.Authenticate,
//NoClientAuth: true,
}
privateBytes, err := ioutil.ReadFile(p.config.SSHHostKeyFile)
if err != nil {
return errors.New("Failed to load private host key")
}
private, err := ssh.ParsePrivateKey(privateBytes)
if err != nil {
return errors.New("Failed to parse private host key")
}
config.AddHostKey(private)
localListener, err := func() (net.Listener, error) {
port, err := strconv.ParseUint(p.config.LocalPort, 10, 16)
if err != nil {
return nil, err
}
tries := 1
if port != 0 {
tries = 10
}
for i := 0; i < tries; i++ {
l, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%d", port))
port++
if err != nil {
ui.Say(err.Error())
continue
}
_, p.config.LocalPort, err = net.SplitHostPort(l.Addr().String())
if err != nil {
ui.Say(err.Error())
continue
}
return l, nil
}
return nil, errors.New("Error setting up SSH proxy connection")
}()
if err != nil {
return err
}
ui = newUi(ui)
p.adapter = newAdapter(p.done, localListener, config, p.config.SFTPCmd, ui, comm)
defer func() {
ui.Say("shutting down the SSH proxy")
close(p.done)
p.adapter.Shutdown()
}()
go p.adapter.Serve()
if len(p.config.inventoryFile) == 0 {
tf, err := ioutil.TempFile("", "packer-provisioner-ansible")
if err != nil {
return fmt.Errorf("Error preparing inventory file: %s", err)
}
defer os.Remove(tf.Name())
inv := fmt.Sprintf("default ansible_ssh_host=127.0.0.1 ansible_ssh_user=packer-ansible ansible_ssh_port=%s", p.config.LocalPort)
_, err = tf.Write([]byte(inv))
if err != nil {
tf.Close()
return fmt.Errorf("Error preparing inventory file: %s", err)
}
tf.Close()
p.config.inventoryFile = tf.Name()
defer func() {
p.config.inventoryFile = ""
}()
}
if err := p.executeAnsible(ui); err != nil {
return fmt.Errorf("Error executing Ansible: %s", err)
}
return nil
}
func (p *Provisioner) Cancel() {
if p.done != nil {
close(p.done)
}
if p.adapter != nil {
p.adapter.Shutdown()
}
os.Exit(0)
}
func (p *Provisioner) executeAnsible(ui packer.Ui) error {
playbook, _ := filepath.Abs(p.config.PlaybookFile)
inventory := p.config.inventoryFile
args := []string{playbook, "-i", inventory}
args = append(args, p.config.ExtraArguments...)
cmd := exec.Command(p.config.Command, args...)
stdout, err := cmd.StdoutPipe()
if err != nil {
return err
}
stderr, err := cmd.StderrPipe()
if err != nil {
return err
}
wg := sync.WaitGroup{}
repeat := func(r io.ReadCloser) {
scanner := bufio.NewScanner(r)
for scanner.Scan() {
ui.Message(scanner.Text())
}
if err := scanner.Err(); err != nil {
ui.Error(err.Error())
}
wg.Done()
}
wg.Add(2)
go repeat(stdout)
go repeat(stderr)
ui.Say(fmt.Sprintf("Executing Ansible: %s", strings.Join(cmd.Args, " ")))
cmd.Start()
wg.Wait()
err = cmd.Wait()
if err != nil {
return fmt.Errorf("Non-zero exit status: %s", err)
}
return nil
}
func validateFileConfig(name string, config string, req bool) error {
if req {
if name == "" {
return fmt.Errorf("%s must be specified.", config)
}
}
info, err := os.Stat(name)
if err != nil {
return fmt.Errorf("%s: %s is invalid: %s", config, name, err)
} else if info.IsDir() {
return fmt.Errorf("%s: %s must point to a file", config, name)
}
return nil
}
// Ui provides concurrency-safe access to packer.Ui.
type Ui struct {
sem chan int
ui packer.Ui
}
func newUi(ui packer.Ui) packer.Ui {
return &Ui{sem: make(chan int, 1), ui: ui}
}
func (ui *Ui) Ask(s string) (string, error) {
ui.sem <- 1
ret, err := ui.ui.Ask(s)
<-ui.sem
return ret, err
}
func (ui *Ui) Say(s string) {
ui.sem <- 1
ui.ui.Say(s)
<-ui.sem
}
func (ui *Ui) Message(s string) {
ui.sem <- 1
ui.ui.Message(s)
<-ui.sem
}
func (ui *Ui) Error(s string) {
ui.sem <- 1
ui.ui.Error(s)
<-ui.sem
}
func (ui *Ui) Machine(t string, args ...string) {
ui.sem <- 1
ui.ui.Machine(t, args...)
<-ui.sem
}