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provisioner.go
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provisioner.go
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// This package implements a provisioner for Packer that executes
// Puppet on the remote machine connecting to a Puppet master.
package puppetserver
import (
"fmt"
"github.com/mitchellh/packer/common"
"github.com/mitchellh/packer/packer"
"os"
"strings"
)
type Config struct {
common.PackerConfig `mapstructure:",squash"`
tpl *packer.ConfigTemplate
// Additional facts to set when executing Puppet
Facter map[string]string
// A path to the client certificate
ClientCertPath string `mapstructure:"client_cert_path"`
// A path to a directory containing the client private keys
ClientPrivateKeyPath string `mapstructure:"client_private_key_path"`
// The hostname of the Puppet node.
PuppetNode string `mapstructure:"puppet_node"`
// The hostname of the Puppet server.
PuppetServer string `mapstructure:"puppet_server"`
// Additional options to be passed to `puppet agent`.
Options string `mapstructure:"options"`
// If true, `sudo` will NOT be used to execute Puppet.
PreventSudo bool `mapstructure:"prevent_sudo"`
// The directory where files will be uploaded. Packer requires write
// permissions in this directory.
StagingDir string `mapstructure:"staging_dir"`
}
type Provisioner struct {
config Config
}
type ExecuteTemplate struct {
FacterVars string
ClientCertPath string
ClientPrivateKeyPath string
PuppetNode string
PuppetServer string
Options string
Sudo bool
}
func (p *Provisioner) Prepare(raws ...interface{}) error {
md, err := common.DecodeConfig(&p.config, raws...)
if err != nil {
return err
}
p.config.tpl, err = packer.NewConfigTemplate()
if err != nil {
return err
}
p.config.tpl.UserVars = p.config.PackerUserVars
// Accumulate any errors
errs := common.CheckUnusedConfig(md)
if p.config.StagingDir == "" {
p.config.StagingDir = "/tmp/packer-puppet-server"
}
// Templates
templates := map[string]*string{
"client_cert_dir": &p.config.ClientCertPath,
"client_private_key_dir": &p.config.ClientPrivateKeyPath,
"puppet_server": &p.config.PuppetServer,
"puppet_node": &p.config.PuppetNode,
"options": &p.config.Options,
}
for n, ptr := range templates {
var err error
*ptr, err = p.config.tpl.Process(*ptr, nil)
if err != nil {
errs = packer.MultiErrorAppend(
errs, fmt.Errorf("Error processing %s: %s", n, err))
}
}
newFacts := make(map[string]string)
for k, v := range p.config.Facter {
k, err := p.config.tpl.Process(k, nil)
if err != nil {
errs = packer.MultiErrorAppend(errs,
fmt.Errorf("Error processing facter key %s: %s", k, err))
continue
}
v, err := p.config.tpl.Process(v, nil)
if err != nil {
errs = packer.MultiErrorAppend(errs,
fmt.Errorf("Error processing facter value '%s': %s", v, err))
continue
}
newFacts[k] = v
}
p.config.Facter = newFacts
if p.config.ClientCertPath != "" {
info, err := os.Stat(p.config.ClientCertPath)
if err != nil {
errs = packer.MultiErrorAppend(errs,
fmt.Errorf("client_cert_dir is invalid: %s", err))
} else if !info.IsDir() {
errs = packer.MultiErrorAppend(errs,
fmt.Errorf("client_cert_dir must point to a directory"))
}
}
if p.config.ClientPrivateKeyPath != "" {
info, err := os.Stat(p.config.ClientPrivateKeyPath)
if err != nil {
errs = packer.MultiErrorAppend(errs,
fmt.Errorf("client_private_key_dir is invalid: %s", err))
} else if !info.IsDir() {
errs = packer.MultiErrorAppend(errs,
fmt.Errorf("client_private_key_dir must point to a directory"))
}
}
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 Puppet...")
ui.Message("Creating Puppet staging directory...")
if err := p.createDir(ui, comm, p.config.StagingDir); err != nil {
return fmt.Errorf("Error creating staging directory: %s", err)
}
// Upload client cert dir if set
remoteClientCertPath := ""
if p.config.ClientCertPath != "" {
ui.Message(fmt.Sprintf(
"Uploading client cert from: %s", p.config.ClientCertPath))
remoteClientCertPath = fmt.Sprintf("%s/certs", p.config.StagingDir)
err := p.uploadDirectory(ui, comm, remoteClientCertPath, p.config.ClientCertPath)
if err != nil {
return fmt.Errorf("Error uploading client cert: %s", err)
}
}
// Upload client cert dir if set
remoteClientPrivateKeyPath := ""
if p.config.ClientPrivateKeyPath != "" {
ui.Message(fmt.Sprintf(
"Uploading client private keys from: %s", p.config.ClientPrivateKeyPath))
remoteClientPrivateKeyPath = fmt.Sprintf("%s/private_keys", p.config.StagingDir)
err := p.uploadDirectory(ui, comm, remoteClientPrivateKeyPath, p.config.ClientPrivateKeyPath)
if err != nil {
return fmt.Errorf("Error uploading client private keys: %s", err)
}
}
// Compile the facter variables
facterVars := make([]string, 0, len(p.config.Facter))
for k, v := range p.config.Facter {
facterVars = append(facterVars, fmt.Sprintf("FACTER_%s='%s'", k, v))
}
// Execute Puppet
command, err := p.config.tpl.Process(p.commandTemplate(), &ExecuteTemplate{
FacterVars: strings.Join(facterVars, " "),
ClientCertPath: remoteClientCertPath,
ClientPrivateKeyPath: remoteClientPrivateKeyPath,
PuppetNode: p.config.PuppetNode,
PuppetServer: p.config.PuppetServer,
Options: p.config.Options,
Sudo: !p.config.PreventSudo,
})
if err != nil {
return err
}
cmd := &packer.RemoteCmd{
Command: command,
}
ui.Message(fmt.Sprintf("Running Puppet: %s", command))
if err := cmd.StartWithUi(comm, ui); err != nil {
return err
}
if cmd.ExitStatus != 0 && cmd.ExitStatus != 2 {
return fmt.Errorf("Puppet exited with a non-zero exit status: %d", cmd.ExitStatus)
}
return nil
}
func (p *Provisioner) Cancel() {
// Just hard quit. It isn't a big deal if what we're doing keeps
// running on the other side.
os.Exit(0)
}
func (p *Provisioner) createDir(ui packer.Ui, comm packer.Communicator, dir string) error {
cmd := &packer.RemoteCmd{
Command: fmt.Sprintf("mkdir -p '%s'", dir),
}
if err := cmd.StartWithUi(comm, ui); err != nil {
return err
}
if cmd.ExitStatus != 0 {
return fmt.Errorf("Non-zero exit status.")
}
return nil
}
func (p *Provisioner) uploadDirectory(ui packer.Ui, comm packer.Communicator, dst string, src string) error {
if err := p.createDir(ui, comm, dst); err != nil {
return err
}
// Make sure there is a trailing "/" so that the directory isn't
// created on the other side.
if src[len(src)-1] != '/' {
src = src + "/"
}
return comm.UploadDir(dst, src, nil)
}
func (p *Provisioner) commandTemplate() string {
return "{{.FacterVars}} {{if .Sudo}} sudo -E {{end}}" +
"puppet agent --onetime --no-daemonize " +
"{{if ne .PuppetServer \"\"}}--server='{{.PuppetServer}}' {{end}}" +
"{{if ne .Options \"\"}}{{.Options}} {{end}}" +
"{{if ne .PuppetNode \"\"}}--certname={{.PuppetNode}} {{end}}" +
"{{if ne .ClientCertPath \"\"}}--certdir='{{.ClientCertPath}}' {{end}}" +
"{{if ne .ClientPrivateKeyPath \"\"}}--privatekeydir='{{.ClientPrivateKeyPath}}' {{end}}" +
"--detailed-exitcodes"
}