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lxd.go
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lxd.go
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package spread
import (
"bytes"
"encoding/json"
"fmt"
"gopkg.in/yaml.v2"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"runtime"
"strconv"
"strings"
"syscall"
"time"
"golang.org/x/net/context"
)
func LXD(p *Project, b *Backend, o *Options) Provider {
return &lxdProvider{p, b, o}
}
type lxdProvider struct {
project *Project
backend *Backend
options *Options
}
type lxdServer struct {
p *lxdProvider
d lxdServerData
system *System
address string
}
type lxdServerData struct {
Name string
}
func (s *lxdServer) String() string {
return fmt.Sprintf("%s (%s)", s.system, s.d.Name)
}
func (s *lxdServer) Label() string {
return s.d.Name
}
func (s *lxdServer) Provider() Provider {
return s.p
}
func (s *lxdServer) Address() string {
return s.address
}
func (s *lxdServer) System() *System {
return s.system
}
func (s *lxdServer) ReuseData() interface{} {
return &s.d
}
func (s *lxdServer) Discard(ctx context.Context) error {
output, err := exec.Command("lxc", "delete", "--force", s.d.Name).CombinedOutput()
if err != nil {
return fmt.Errorf("cannot discard lxd container: %v", outputErr(output, err))
}
return nil
}
func (p *lxdProvider) Backend() *Backend {
return p.backend
}
func (p *lxdProvider) GarbageCollect() error {
return nil
}
func (p *lxdProvider) Reuse(ctx context.Context, rsystem *ReuseSystem, system *System) (Server, error) {
s := &lxdServer{
p: p,
system: system,
address: rsystem.Address,
}
err := rsystem.UnmarshalData(&s.d)
if err != nil {
return nil, fmt.Errorf("cannot unmarshal lxd reuse data: %v", err)
}
return s, nil
}
func (p *lxdProvider) Allocate(ctx context.Context, system *System) (Server, error) {
lxdimage, err := p.lxdImage(system)
if err != nil {
return nil, err
}
name, err := lxdName(system)
if err != nil {
return nil, err
}
if p.backend.Location != "" {
name = p.backend.Location + ":" + name
}
args := []string{"launch", lxdimage, name}
if !p.options.Reuse {
args = append(args, "--ephemeral")
}
output, err := exec.Command("lxc", args...).CombinedOutput()
if err != nil {
err = outputErr(output, err)
if bytes.Contains(output, []byte("error: not found")) {
err = fmt.Errorf("%s not found", lxdimage)
}
return nil, &FatalError{fmt.Errorf("cannot launch lxd container: %v", err)}
}
s := &lxdServer{
p: p,
d: lxdServerData{
Name: name,
},
system: system,
}
printf("Waiting for lxd container %s to have an address...", name)
timeout := time.After(30 * time.Second)
retry := time.NewTicker(1 * time.Second)
defer retry.Stop()
for {
addr, err := p.address(name)
if err == nil {
s.address = addr
break
}
if _, ok := err.(*lxdNoAddrError); !ok {
s.Discard(ctx)
return nil, err
}
select {
case <-retry.C:
case <-timeout:
s.Discard(ctx)
return nil, err
}
}
err = p.tuneSSH(name)
if err != nil {
s.Discard(ctx)
return nil, err
}
printf("Allocated %s.", s)
return s, nil
}
func isDebArch(s string) bool {
switch s {
case "amd64", "i386", "armel", "armhf", "arm64", "powerpc", "ppc64el", "s390x":
return true
}
return false
}
func debArch() string {
switch runtime.GOARCH {
case "386":
return "i386"
case "amd64":
return "amd64"
case "arm":
return "armhf"
case "arm64":
return "arm64"
case "ppc64le":
return "ppc64el"
case "s390x":
return "s390x"
case "ppc":
return "powerpc"
case "ppc64":
return "ppc64"
}
return "amd64"
}
func (p *lxdProvider) lxdImage(system *System) (string, error) {
// LXD loves the network. Force it to use a local image if available.
fingerprint, err := p.lxdLocalImage(system)
if err == nil {
return fingerprint, nil
}
if err != errNoImage {
return "", err
}
logf("Cannot find cached LXD image for %s.", system)
// If a remote was explicitly provided, use LXD image name as-is.
if strings.Contains(system.Image, ":") {
return system.Image, nil
}
// Translate spread-like name to LXD-like URL.
parts := strings.Split(system.Image, "-")
if !isDebArch(parts[len(parts)-1]) {
parts = append(parts, debArch())
}
if parts[0] == "ubuntu" {
return "ubuntu:" + strings.Join(parts[1:], "/"), nil
}
return "images:" + strings.Join(parts, "/"), nil
}
type lxdImageInfo struct {
Properties struct {
OS string
Label string
Release string
Version string
Aliases string
Architecture string
Remote string
} `yaml:"Properties"`
Source struct {
Server string `yaml:"Server"`
} `yaml:"Source"`
}
var errNoImage = fmt.Errorf("image not found")
var lxdRemoteServer = map[string]string{
"ubuntu": "https://cloud-images.ubuntu.com/releases",
"images": "https://images.linuxcontainers.org",
}
func (p *lxdProvider) lxdRemoteNames() (map[string]string, error) {
var stderr bytes.Buffer
cmd := exec.Command("lxc", "remote", "list")
cmd.Stderr = &stderr
output, err := cmd.Output()
if err != nil {
err = outputErr(stderr.Bytes(), err)
return nil, fmt.Errorf("cannot list lxd remotes: %v", err)
}
var names = make(map[string]string)
var lines = strings.Split(string(output), "\n")
for i := 3; i < len(lines); i += 2 {
fields := strings.Split(lines[i], "|")
if len(fields) < 3 {
break
}
names[strings.TrimSpace(fields[2])] = strings.TrimSpace(fields[1])
}
return names, nil
}
func (p *lxdProvider) lxdLocalImage(system *System) (string, error) {
parts := strings.Split(system.Image, "/")
remote := ""
if pair := strings.Split(parts[0], ":"); len(pair) > 1 {
parts[0] = pair[1]
remote = pair[0]
} else if len(parts) == 1 && !strings.Contains(parts[0], "/") {
// Translate spread-like name to LXD-like URL.
parts = strings.Split(parts[0], "-")
}
if remote == "" {
if parts[0] == "ubuntu" {
parts = parts[1:]
remote = "ubuntu"
} else {
remote = "images"
}
}
if !isDebArch(parts[len(parts)-1]) {
parts = append(parts, debArch())
}
remoteNames, err := p.lxdRemoteNames()
if err != nil {
return "", err
}
var stderr bytes.Buffer
cmd := exec.Command("lxc", "image", "list")
cmd.Stderr = &stderr
output, err := cmd.Output()
if err != nil {
err = outputErr(stderr.Bytes(), err)
return "", fmt.Errorf("cannot list lxd images: %v", err)
}
var fingerprints []string
var lines = strings.Split(string(output), "\n")
for i := 3; i < len(lines); i += 2 {
fields := strings.Split(lines[i], "|")
if len(fields) < 3 {
break
}
fingerprints = append(fingerprints, strings.TrimSpace(fields[2]))
}
NextImage:
for _, fingerprint := range fingerprints {
stderr.Truncate(0)
cmd := exec.Command("lxc", "image", "info", fingerprint)
cmd.Stderr = &stderr
output, err := cmd.Output()
if err != nil {
err = outputErr(stderr.Bytes(), err)
return "", fmt.Errorf("cannot obtain info about lxd image %s: %v", fingerprint, err)
}
var info lxdImageInfo
err = yaml.Unmarshal(output, &info)
if err != nil {
return "", fmt.Errorf("cannot obtain info about lxd image %s: %v", fingerprint, err)
}
props := info.Properties
aliases := strings.Split(props.Aliases, ",")
if info.Source.Server != "" && remoteNames[info.Source.Server] != remote {
continue
}
// This is a hack. Unfortunatley exported+imported images lose their remote.
if info.Source.Server == "" && props.Remote != remote {
continue
}
for _, part := range parts {
switch part {
case props.OS, props.Label, props.Release, props.Version, props.Architecture:
continue
}
if contains(aliases, part) {
continue
}
continue NextImage
}
logf("Using cached LXD image for %s: %s", system, fingerprint)
return fingerprint, nil
}
return "", errNoImage
}
func lxdName(system *System) (string, error) {
filename := os.ExpandEnv("$HOME/.spread/lxd-count")
file, err := os.OpenFile(filename, os.O_RDWR, 0644)
if os.IsNotExist(err) {
err = os.Mkdir(filepath.Dir(filename), 0755)
if err != nil && !os.IsExist(err) {
return "", fmt.Errorf("cannot create ~/.spread/: %v", err)
}
file, err = os.OpenFile(filename, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0644)
if err != nil {
return "", fmt.Errorf("cannot create ~/.spread/lxd-count: %v", err)
}
} else if err != nil {
return "", fmt.Errorf("cannot open ~/.spread/lxd-count: %v", err)
}
defer file.Close()
const LOCK_EX = 2
err = syscall.Flock(int(file.Fd()), LOCK_EX)
if err != nil {
return "", fmt.Errorf("cannot obtain lock on ~/.spread/lxd-count: %v", err)
}
data, err := ioutil.ReadAll(file)
if err != nil {
return "", fmt.Errorf("cannot read ~/.spread/lxd-count: %v", err)
}
n := 0
nstr := strings.TrimSpace(string(data))
if nstr != "" {
n, err = strconv.Atoi(nstr)
if err != nil {
return "", fmt.Errorf("expected integer in ~/.spread/lxd-count, got %q", nstr)
}
}
n++
_, err = file.WriteAt([]byte(strconv.Itoa(n)), 0)
if err != nil {
return "", fmt.Errorf("cannot write to ~/.spread/lxd-count: %v", err)
}
return fmt.Sprintf("spread-%d-%s", n, strings.Replace(system.Name, ".", "-", -1)), nil
}
type lxdServerJSON struct {
Name string `json:"name"`
State struct {
Network map[string]lxdDeviceJSON `json:"network"`
} `json:"state"`
}
type lxdDeviceJSON struct {
State string `json:"state"`
Addresses []lxdAddressJSON `json:"addresses"`
}
type lxdAddressJSON struct {
Family string `json:"family"`
Address string `json:"address"`
}
type lxdNoServerError struct {
name string
}
func (e *lxdNoServerError) Error() string {
return fmt.Sprintf("cannot find lxd server %q", e.name)
}
type lxdNoAddrError struct {
name string
}
func (e *lxdNoAddrError) Error() string {
return fmt.Sprintf("lxd server %s has no address available", e.name)
}
func (p *lxdProvider) address(name string) (string, error) {
sjson, err := p.serverJSON(name)
if err != nil {
return "", err
}
for _, addr := range sjson.State.Network["eth0"].Addresses {
if addr.Family == "inet" && addr.Address != "" {
return addr.Address, nil
}
}
return "", &lxdNoAddrError{name}
}
func (p *lxdProvider) serverJSON(name string) (*lxdServerJSON, error) {
var stderr bytes.Buffer
cmd := exec.Command("lxc", "list", "--format=json", name)
cmd.Stderr = &stderr
output, err := cmd.Output()
if err != nil {
err = outputErr(stderr.Bytes(), err)
return nil, fmt.Errorf("cannot list lxd container: %v", err)
}
var sjsons []*lxdServerJSON
err = json.Unmarshal(output, &sjsons)
if err != nil {
return nil, fmt.Errorf("cannot unmarshal lxd list output: %v", err)
}
debugf("lxd list output: %# v\n", sjsons)
if len(sjsons) == 0 {
return nil, &lxdNoServerError{name}
}
if sjsons[0].Name != name {
return nil, fmt.Errorf("lxd returned invalid JSON listing for %q: %s", name, outputErr(output, nil))
}
return sjsons[0], nil
}
func (p *lxdProvider) tuneSSH(name string) error {
cmds := [][]string{
{"sed", "-i", `s/^\s*#\?\s*\(PermitRootLogin\|PasswordAuthentication\)\>.*/\1 yes/`, "/etc/ssh/sshd_config"},
{"/bin/bash", "-c", fmt.Sprintf("echo root:'%s' | chpasswd", p.options.Password)},
{"killall", "-HUP", "sshd"},
}
for _, args := range cmds {
output, err := exec.Command("lxc", append([]string{"exec", name, "--"}, args...)...).CombinedOutput()
if err != nil && args[0] != "killall" {
return fmt.Errorf("cannot prepare sshd in lxd container %q: %v", name, outputErr(output, err))
}
}
return nil
}
func contains(strs []string, s string) bool {
for _, si := range strs {
if si == s {
return true
}
}
return false
}