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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 a
// saltstack highstate within the remote machine
package saltmasterless
import (
"errors"
"fmt"
"os"
"path/filepath"
"github.com/mitchellh/packer/common"
"github.com/mitchellh/packer/helper/config"
"github.com/mitchellh/packer/packer"
"github.com/mitchellh/packer/template/interpolate"
)
const DefaultTempConfigDir = "/tmp/salt"
const DefaultStateTreeDir = "/srv/salt"
const DefaultPillarRootDir = "/srv/pillar"
type Config struct {
common.PackerConfig `mapstructure:",squash"`
// If true, run the salt-bootstrap script
SkipBootstrap bool `mapstructure:"skip_bootstrap"`
BootstrapArgs string `mapstructure:"bootstrap_args"`
DisableSudo bool `mapstructure:"disable_sudo"`
// Local path to the minion config
MinionConfig string `mapstructure:"minion_config"`
// Local path to the salt state tree
LocalStateTree string `mapstructure:"local_state_tree"`
// Local path to the salt pillar roots
LocalPillarRoots string `mapstructure:"local_pillar_roots"`
// Remote path to the salt state tree
RemoteStateTree string `mapstructure:"remote_state_tree"`
// Remote path to the salt pillar roots
RemotePillarRoots string `mapstructure:"remote_pillar_roots"`
// Where files will be copied before moving to the /srv/salt directory
TempConfigDir string `mapstructure:"temp_config_dir"`
ctx interpolate.Context
}
type Provisioner struct {
config Config
}
func (p *Provisioner) Prepare(raws ...interface{}) error {
err := config.Decode(&p.config, &config.DecodeOpts{
Interpolate: true,
InterpolateContext: &p.config.ctx,
InterpolateFilter: &interpolate.RenderFilter{
Exclude: []string{},
},
}, raws...)
if err != nil {
return err
}
if p.config.TempConfigDir == "" {
p.config.TempConfigDir = DefaultTempConfigDir
}
if p.config.RemoteStateTree == "" {
p.config.RemoteStateTree = DefaultStateTreeDir
}
if p.config.RemotePillarRoots == "" {
p.config.RemotePillarRoots = DefaultPillarRootDir
}
var errs *packer.MultiError
// require a salt state tree
if p.config.LocalStateTree == "" {
errs = packer.MultiErrorAppend(errs,
errors.New("local_state_tree must be supplied"))
} else {
if _, err := os.Stat(p.config.LocalStateTree); err != nil {
errs = packer.MultiErrorAppend(errs,
errors.New("local_state_tree must exist and be accessible"))
}
}
if p.config.LocalPillarRoots != "" {
if _, err := os.Stat(p.config.LocalPillarRoots); err != nil {
errs = packer.MultiErrorAppend(errs,
errors.New("local_pillar_roots must exist and be accessible"))
}
}
if p.config.MinionConfig != "" {
if _, err := os.Stat(p.config.MinionConfig); err != nil {
errs = packer.MultiErrorAppend(errs,
errors.New("minion_config must exist and be accessible"))
}
}
if errs != nil && len(errs.Errors) > 0 {
return errs
}
return nil
}
func (p *Provisioner) Provision(ui packer.Ui, comm packer.Communicator) error {
var err error
var src, dst string
ui.Say("Provisioning with Salt...")
if !p.config.SkipBootstrap {
cmd := &packer.RemoteCmd{
Command: fmt.Sprintf("curl -L https://bootstrap.saltstack.com -o /tmp/install_salt.sh"),
}
ui.Message(fmt.Sprintf("Downloading saltstack bootstrap to /tmp/install_salt.sh"))
if err = cmd.StartWithUi(comm, ui); err != nil {
return fmt.Errorf("Unable to download Salt: %s", err)
}
cmd = &packer.RemoteCmd{
Command: fmt.Sprintf("%s /tmp/install_salt.sh %s", p.sudo("sh"), p.config.BootstrapArgs),
}
ui.Message(fmt.Sprintf("Installing Salt with command %s", cmd.Command))
if err = cmd.StartWithUi(comm, ui); err != nil {
return fmt.Errorf("Unable to install Salt: %s", err)
}
}
ui.Message(fmt.Sprintf("Creating remote temporary directory: %s", p.config.TempConfigDir))
if err := p.createDir(ui, comm, p.config.TempConfigDir); err != nil {
return fmt.Errorf("Error creating remote temporary directory: %s", err)
}
if p.config.MinionConfig != "" {
ui.Message(fmt.Sprintf("Uploading minion config: %s", p.config.MinionConfig))
src = p.config.MinionConfig
dst = filepath.ToSlash(filepath.Join(p.config.TempConfigDir, "minion"))
if err = p.uploadFile(ui, comm, dst, src); err != nil {
return fmt.Errorf("Error uploading local minion config file to remote: %s", err)
}
// move minion config into /etc/salt
ui.Message(fmt.Sprintf("Make sure directory %s exists", "/etc/salt"))
if err := p.createDir(ui, comm, "/etc/salt"); err != nil {
return fmt.Errorf("Error creating remote salt configuration directory: %s", err)
}
src = filepath.ToSlash(filepath.Join(p.config.TempConfigDir, "minion"))
dst = "/etc/salt/minion"
if err = p.moveFile(ui, comm, dst, src); err != nil {
return fmt.Errorf("Unable to move %s/minion to /etc/salt/minion: %s", p.config.TempConfigDir, err)
}
}
ui.Message(fmt.Sprintf("Uploading local state tree: %s", p.config.LocalStateTree))
src = p.config.LocalStateTree
dst = filepath.ToSlash(filepath.Join(p.config.TempConfigDir, "states"))
if err = p.uploadDir(ui, comm, dst, src, []string{".git"}); err != nil {
return fmt.Errorf("Error uploading local state tree to remote: %s", err)
}
// move state tree from temporary directory
src = filepath.ToSlash(filepath.Join(p.config.TempConfigDir, "states"))
dst = p.config.RemoteStateTree
if err = p.removeDir(ui, comm, dst); err != nil {
return fmt.Errorf("Unable to clear salt tree: %s", err)
}
if err = p.moveFile(ui, comm, dst, src); err != nil {
return fmt.Errorf("Unable to move %s/states to %s: %s", p.config.TempConfigDir, dst, err)
}
if p.config.LocalPillarRoots != "" {
ui.Message(fmt.Sprintf("Uploading local pillar roots: %s", p.config.LocalPillarRoots))
src = p.config.LocalPillarRoots
dst = filepath.ToSlash(filepath.Join(p.config.TempConfigDir, "pillar"))
if err = p.uploadDir(ui, comm, dst, src, []string{".git"}); err != nil {
return fmt.Errorf("Error uploading local pillar roots to remote: %s", err)
}
// move pillar root from temporary directory
src = filepath.ToSlash(filepath.Join(p.config.TempConfigDir, "pillar"))
dst = p.config.RemotePillarRoots
if err = p.removeDir(ui, comm, dst); err != nil {
return fmt.Errorf("Unable to clear pillat root: %s", err)
}
if err = p.moveFile(ui, comm, dst, src); err != nil {
return fmt.Errorf("Unable to move %s/pillar to %s: %s", p.config.TempConfigDir, dst, err)
}
}
ui.Message("Running highstate")
cmd := &packer.RemoteCmd{Command: fmt.Sprintf(p.sudo("salt-call --local state.highstate --file-root=%s --pillar-root=%s -l info --retcode-passthrough"),p.config.RemoteStateTree, p.config.RemotePillarRoots)}
if err = cmd.StartWithUi(comm, ui); err != nil || cmd.ExitStatus != 0 {
if err == nil {
err = fmt.Errorf("Bad exit status: %d", cmd.ExitStatus)
}
return fmt.Errorf("Error executing highstate: %s", err)
}
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)
}
// Prepends sudo to supplied command if config says to
func (p *Provisioner) sudo(cmd string) string {
if p.config.DisableSudo {
return cmd
}
return "sudo " + cmd
}
func (p *Provisioner) uploadFile(ui packer.Ui, comm packer.Communicator, dst, src string) error {
f, err := os.Open(src)
if err != nil {
return fmt.Errorf("Error opening: %s", err)
}
defer f.Close()
if err = comm.Upload(dst, f, nil); err != nil {
return fmt.Errorf("Error uploading %s: %s", src, err)
}
return nil
}
func (p *Provisioner) moveFile(ui packer.Ui, comm packer.Communicator, dst, src string) error {
ui.Message(fmt.Sprintf("Moving %s to %s", src, dst))
cmd := &packer.RemoteCmd{Command: fmt.Sprintf(p.sudo("mv %s %s"), src, dst)}
if err := cmd.StartWithUi(comm, ui); err != nil || cmd.ExitStatus != 0 {
if err == nil {
err = fmt.Errorf("Bad exit status: %d", cmd.ExitStatus)
}
return fmt.Errorf("Unable to move %s to %s: %s", src, dst, err)
}
return nil
}
func (p *Provisioner) createDir(ui packer.Ui, comm packer.Communicator, dir string) error {
ui.Message(fmt.Sprintf("Creating directory: %s", dir))
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) removeDir(ui packer.Ui, comm packer.Communicator, dir string) error {
ui.Message(fmt.Sprintf("Removing directory: %s", dir))
cmd := &packer.RemoteCmd{
Command: fmt.Sprintf("rm -rf '%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) uploadDir(ui packer.Ui, comm packer.Communicator, dst, src string, ignore []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, ignore)
}