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Signed-off-by: Thomas Hipp <thomas.hipp@canonical.com>
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Thomas Hipp 2018-02-02 17:36:48 +01:00
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5
AUTHORS Normal file
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Unless mentioned otherwise in a specific file's header, all code in this
project is released under the Apache 2.0 license.
The list of authors and contributors can be retrieved from the git
commit history and in some cases, the file headers.

202
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
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outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
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.PHONY: default check
default:
gofmt -s -w .
go get -t -v -d ./...
go install -v ./...
@echo "distrobuilder built successfully"
check: default
go get -v -x github.com/rogpeppe/godeps
go get -v -x github.com/remyoudompheng/go-misc/deadcode
go get -v -x github.com/golang/lint/golint
go test -v ./...
golint -set_exit_status ./...

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# distrobuilder
Custom image generator
## Example yaml file
```yaml
image:
distribution: ubuntu # required
release: artful # required
variant: default # optional
description: Ubuntu Artful # optional
expiry: 30d # optional: defaults to 30d
arch: x86_64 # optional: defaults to local architecture
source:
downloader: ubuntu-http
url: http://cdimage.ubuntu.com/ubuntu-base
targets:
lxc:
create-message: |
You just created an Ubuntu container (release=artful, arch=amd64, variant=default)
To enable sshd, run: apt-get install openssh-server
For security reason, container images ship without user accounts
and without a root password.
Use lxc-attach or chroot directly into the rootfs to set a root password
or create user accounts.
config: |
lxc.include = LXC_TEMPLATE_CONFIG/ubuntu.common.conf
lxc.arch = x86_64
config-user: |
lxc.include = LXC_TEMPLATE_CONFIG/ubuntu.common.conf
lxc.include = LXC_TEMPLATE_CONFIG/ubuntu.userns.conf
lxc.arch = x86_64
files:
# lxc: Puts the LXC_NAME placeholder in place
# lxd: Adds a template to generate the file on create and copy
- name: hostname
path: /etc/hostname
generator: hostname
# lxc: Puts the LXC_NAME placeholder in place
# lxd: Adds a template to generate the file on create
- name: hosts
path: /etc/hosts
generator: hosts
# all: Add the upstart job to deal with ttys
- name: /etc/init/lxc-tty.conf
generator: upstart-tty
releases:
- precise
- trusty
packages:
manager: apt
update: false
install:
- systemd
- nginx
- vim
remove:
- vim
```

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package main
import (
"fmt"
"os"
"path/filepath"
"syscall"
"github.com/lxc/distrobuilder/managers"
"github.com/lxc/distrobuilder/shared"
)
func prepareChroot(cacheDir string) ([]string, error) {
type Mount struct {
source string
target string
fstype string
flags uintptr
data string
}
var (
err error
unmounts []string
)
mounts := []Mount{
{filepath.Join(cacheDir, "rootfs"), "", "tmpfs", syscall.MS_BIND, ""},
{"proc", "proc", "proc", 0, ""},
{"sys", "sys", "sysfs", 0, ""},
{"udev", "dev", "devtmpfs", 0, ""},
{"shm", "/dev/shm", "tmpfs", 0, ""},
{"/dev/pts", "/dev/pts", "tmpfs", syscall.MS_BIND, ""},
{"run", "/run", "tmpfs", 0, ""},
{"tmp", "/tmp", "tmpfs", 0, ""},
}
os.MkdirAll(filepath.Join(cacheDir, "rootfs", "dev", "pts"), 0755)
for _, mount := range mounts {
err = syscall.Mount(mount.source, filepath.Join(cacheDir, "rootfs", mount.target),
mount.fstype, mount.flags, mount.data)
if err != nil {
return unmounts, err
}
unmounts = append(unmounts, filepath.Join(cacheDir, "rootfs", mount.target))
}
return unmounts, nil
}
func setupChroot(cacheDir string) (func() error, error) {
var err error
cwd, err := os.Getwd()
if err != nil {
return nil, err
}
err = shared.Copy("/etc/resolv.conf", filepath.Join(cacheDir, "rootfs", "etc", "resolv.conf"))
if err != nil {
return nil, err
}
unmounts, err := prepareChroot(cacheDir)
if err != nil {
for i := len(unmounts) - 1; i >= 0; i-- {
syscall.Unmount(unmounts[i], 0)
}
return nil, err
}
syscall.Mknod(filepath.Join(cacheDir, "rootfs", "dev", "null"), 1, 3)
root, err := os.Open("/")
if err != nil {
return nil, err
}
err = syscall.Chroot(filepath.Join(cacheDir, "rootfs"))
if err != nil {
root.Close()
return nil, err
}
err = syscall.Chdir("/")
if err != nil {
return nil, err
}
return func() error {
// unmount targets in reversed order
for i := len(unmounts) - 1; i >= 0; i-- {
syscall.Unmount(unmounts[i], 0)
}
defer root.Close()
err = root.Chdir()
if err != nil {
return err
}
err = syscall.Chroot(".")
if err != nil {
return err
}
err = syscall.Chdir(cwd)
if err != nil {
return err
}
return nil
}, nil
}
func manageChroot(def shared.DefinitionPackages) error {
var err error
manager := managers.Get(def.Manager)
if manager == nil {
return fmt.Errorf("Couldn't get manager")
}
err = manager.Refresh()
if err != nil {
return err
}
if def.Update {
err = manager.Update()
if err != nil {
return err
}
}
err = manager.Install(def.Install)
if err != nil {
return err
}
err = manager.Remove(def.Remove)
if err != nil {
return err
}
err = manager.Clean()
if err != nil {
return err
}
return nil
}

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package main
/*
#define _GNU_SOURCE
#include <errno.h>
#include <sched.h>
#include <stdio.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
__attribute__((constructor)) void init(void) {
pid_t pid;
int ret;
if (geteuid() != 0) {
fprintf(stderr, "Need to run as root\n");
_exit(1);
}
// Unshare a new mntns so our mounts don't leak
if (unshare(CLONE_NEWNS | CLONE_NEWPID) < 0) {
fprintf(stderr, "Failed to unshare namespaces: %s\n", strerror(errno));
_exit(1);
}
// Prevent mount propagation back to initial namespace
if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL) < 0) {
fprintf(stderr, "Failed to mark / private: %s\n", strerror(errno));
_exit(1);
}
pid = fork();
if (pid < 0) {
fprintf(stderr, "Failed to fork: %s\n", strerror(errno));
_exit(1);
} else if (pid > 0) {
// parent
waitpid(pid, &ret, 0);
_exit(WEXITSTATUS(ret));
}
// We're done, jump back to Go
}
*/
import "C"
import (
"bufio"
"bytes"
"fmt"
"io"
"os"
"github.com/lxc/distrobuilder/shared"
"github.com/lxc/distrobuilder/sources"
cli "gopkg.in/urfave/cli.v1"
yaml "gopkg.in/yaml.v2"
)
func init() {
os.Setenv("PATH", "/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin")
os.Setenv("SHELL", "/bin/sh")
os.Setenv("TERM", "xterm")
}
func main() {
app := cli.NewApp()
app.Usage = "image generator"
// INPUT can either be a file or '-' which reads from stdin
app.ArgsUsage = "[file|-]"
app.HideHelp = true
app.Action = run
app.Flags = []cli.Flag{
cli.BoolFlag{
Name: "lxc",
Usage: "generate LXC image files",
},
cli.BoolFlag{
Name: "lxd",
Usage: "generate LXD image files",
},
cli.BoolFlag{
Name: "plain",
Usage: "generate plain chroot",
},
cli.BoolTFlag{
Name: "unified",
Usage: "output unified tarball for LXD images",
},
cli.BoolTFlag{
Name: "cleanup",
Usage: "clean up build directory",
},
cli.StringFlag{
Name: "template-dir",
Usage: "template directory",
},
cli.StringFlag{
Name: "cache-dir",
Usage: "cache directory",
Value: "/var/cache/distrobuilder",
},
cli.StringFlag{
Name: "compression",
Usage: "compression algorithm",
},
cli.BoolFlag{
Name: "help, h",
Usage: "show help",
},
}
err := app.Run(os.Args)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
func run(c *cli.Context) error {
var (
def shared.Definition
// distro distributions.Distribution
downloader sources.Downloader
)
os.RemoveAll(c.GlobalString("cache-dir"))
os.MkdirAll(c.GlobalString("cache-dir"), 0755)
def, err := getDefinition(c.Args().Get(0))
if err != nil {
return fmt.Errorf("Error getting definition: %s", err)
}
downloader = sources.Get(def.Source.Downloader)
if downloader == nil {
return fmt.Errorf("Unsupported source downloader: %s", def.Source.Downloader)
}
err = downloader.Run(def.Source.URL, def.Image.Release, def.Image.Variant,
def.Image.Arch, c.GlobalString("cache-dir"))
if err != nil {
return fmt.Errorf("Error while downloading source: %s", err)
}
if c.GlobalBoolT("cleanup") {
defer os.RemoveAll(c.GlobalString("cache-dir"))
}
exitFunc, err := setupChroot(c.GlobalString("cache-dir"))
if err != nil {
return fmt.Errorf("Failed to chroot: %s", err)
}
defer exitFunc()
err = manageChroot(def.Packages)
if err != nil {
return fmt.Errorf("Failed to run setup: %s", err)
}
return nil
}
func getDefinition(fname string) (shared.Definition, error) {
var (
err error
buf bytes.Buffer
def shared.Definition
)
if fname == "" || fname == "-" {
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
buf.WriteString(scanner.Text())
}
} else {
f, err := os.Open(fname)
if err != nil {
return def, err
}
defer f.Close()
_, err = io.Copy(&buf, f)
if err != nil {
return def, err
}
}
err = yaml.Unmarshal(buf.Bytes(), &def)
if err != nil {
return def, err
}
return def, err
}

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package managers
// NewApk creates a new Manager instance.
func NewApk() *Manager {
return &Manager{
command: "apk",
flags: ManagerFlags{
global: []string{
"--no-cache",
},
install: []string{
"add",
},
remove: []string{
"del", "--rdepends",
},
refresh: []string{
"update",
},
update: []string{
"upgrade",
},
},
}
}

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managers/apt.go Normal file
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package managers
// NewApt creates a new Manager instance.
func NewApt() *Manager {
return &Manager{
command: "apt-get",
flags: ManagerFlags{
clean: []string{
"clean",
},
global: []string{
"-y",
},
install: []string{
"install", "--no-install-recommends",
},
remove: []string{
"remove", "--auto-remove",
},
refresh: []string{
"update",
},
update: []string{
"upgrade",
},
},
}
}

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managers/manager.go Normal file
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package managers
import "github.com/lxc/distrobuilder/shared"
// ManagerFlags represents flags for all subcommands of a package manager.
type ManagerFlags struct {
global []string
install []string
remove []string
clean []string
update []string
refresh []string
}
// ManagerHooks represents custom hooks.
type ManagerHooks struct {
clean func() error
}
// A Manager represents a package manager.
type Manager struct {
command string
flags ManagerFlags
hooks ManagerHooks
}
// Get returns a Manager specified by name.
func Get(name string) *Manager {
switch name {
case "apt":
return NewApt()
case "pacman":
return NewPacman()
case "yum":
return NewYum()
case "apk":
return NewApk()
}
return nil
}
// Install installs packages to the rootfs.
func (m Manager) Install(pkgs []string) error {
if len(m.flags.install) == 0 || pkgs == nil || len(pkgs) == 0 {
return nil
}
args := append(m.flags.global, m.flags.install...)
args = append(args, pkgs...)
return shared.RunCommand(m.command, args...)
}
// Remove removes packages from the rootfs.
func (m Manager) Remove(pkgs []string) error {
if len(m.flags.remove) == 0 || pkgs == nil || len(pkgs) == 0 {
return nil
}
args := append(m.flags.global, m.flags.remove...)
args = append(args, pkgs...)
return shared.RunCommand(m.command, args...)
}
// Clean cleans up cached files used by the package managers.
func (m Manager) Clean() error {
var err error
if len(m.flags.clean) == 0 {
return nil
}
args := append(m.flags.global, m.flags.clean...)
err = shared.RunCommand(m.command, args...)
if err != nil {
return err
}
if m.hooks.clean != nil {
err = m.hooks.clean()
}
return err
}
// Refresh refreshes the local package database.
func (m Manager) Refresh() error {
if len(m.flags.refresh) == 0 {
return nil
}
args := append(m.flags.global, m.flags.refresh...)
return shared.RunCommand(m.command, args...)
}
// Update updates all packages.
func (m Manager) Update() error {
if len(m.flags.update) == 0 {
return nil
}
args := append(m.flags.global, m.flags.update...)
return shared.RunCommand(m.command, args...)
}

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package managers
import (
"fmt"
"os"
"path/filepath"
"github.com/monstermunchkin/distrobuilder/shared"
)
// NewPacman creates a new Manager instance.
func NewPacman() *Manager {
err := setMirrorlist()
if err != nil {
return nil
}
// shared.RunCommand("pacman", "-Syy")
err = setupTrustedKeys()
if err != nil {
return nil
}
return &Manager{
command: "pacman",
flags: ManagerFlags{
clean: []string{
"-Sc",
},
global: []string{
"--noconfirm",
},
install: []string{
"-S", "--needed",
},
remove: []string{
"-Rcs",
},
refresh: []string{
"-Syy",
},
update: []string{
"-Su",
},
},
hooks: ManagerHooks{
clean: func() error {
return os.RemoveAll("/var/cache/pacman/pkg")
},
},
}
}
func setupTrustedKeys() error {
var err error
_, err = os.Stat("/etc/pacman.d/gnupg")
if err == nil {
return nil
}
err = shared.RunCommand("pacman-key", "--init")
if err != nil {
return fmt.Errorf("Error initializing with pacman-key: %s", err)
}
err = shared.RunCommand("pacman-key", "--populate", "archlinux")
if err != nil {
return fmt.Errorf("Error populating with pacman-key: %s", err)
}
return nil
}
func setMirrorlist() error {
f, err := os.Create(filepath.Join("etc", "pacman.d", "mirrorlist"))
if err != nil {
return err
}
defer f.Close()
_, err = f.WriteString("Server = http://mirrors.kernel.org/archlinux/$repo/os/$arch")
if err != nil {
return err
}
return nil
}

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managers/yum.go Normal file
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package managers
// NewYum creates a new Manager instance.
func NewYum() *Manager {
return &Manager{
command: "yum",
flags: ManagerFlags{
clean: []string{
"clean",
},
global: []string{
"-y",
},
install: []string{
"install",
},
remove: []string{
"remove",
},
refresh: []string{
"update",
},
update: []string{
"upgrade",
},
},
}
}

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shared/definition.go Normal file
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package shared
// A DefinitionPackages list packages which are to be either installed or
// removed.
type DefinitionPackages struct {
Manager string `yaml:"manager"`
Install []string `yaml:"install,omitempty"`
Remove []string `yaml:"remove,omitempty"`
Update bool `yaml:"update,omitempty"`
}
// A DefinitionImage represents the image.
type DefinitionImage struct {
Description string `yaml:"description"`
Distribution string `yaml:"distribution"`
Release string `yaml:"release"`
Arch string `yaml:"arch,omitempty"`
Expiry string `yaml:"expiry,omitempty"`
Variant string `yaml:"variant,omitempty"`
}
// A DefinitionSource specifies the download type and location
type DefinitionSource struct {
Downloader string `yaml:"downloader"`
URL string `yaml:"url"`
}
// A DefinitionTargetLXC represents LXC specific files as part of the metadata.
type DefinitionTargetLXC struct {
CreateMessage string `yaml:"create-message,omitempty"`
Config string `yaml:"config,omitempty"`
ConfigUser string `yaml:"config-user,omitempty"`
}
// A DefinitionTarget specifies target dependent files.
type DefinitionTarget struct {
LXC DefinitionTargetLXC `yaml:"lxc,omitempty"`
}
// A DefinitionFile represents a file which is to be created inside to chroot.
type DefinitionFile struct {
Name string `yaml:"name"`
Generator string `yaml:"generator"`
Path string `yaml:"path,omitempty"`
Releases []string `yaml:"releases,omitempty"`
}
// A Definition a definition.
type Definition struct {
Image DefinitionImage `yaml:"image"`
Source DefinitionSource `yaml:"source"`
Targets DefinitionTarget `yaml:"targets,omitempty"`
Files []DefinitionFile `yaml:"files,omitempty"`
Packages DefinitionPackages `yaml:"packages,omitempty"`
}

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package shared
import (
"bufio"
"crypto/sha256"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"regexp"
"strings"
lxd "github.com/lxc/lxd/shared"
"github.com/lxc/lxd/shared/ioprogress"
)
// Download downloads a file. If a checksum file is provided will try and match
// the hash.
func Download(file, checksum string) error {
var (
client http.Client
hash string
err error
)
if checksum != "" {
hash, err = downloadChecksum(checksum, file)
if err != nil {
return fmt.Errorf("Error while downloading checksum: %s", err)
}
}
imagePath := filepath.Join(os.TempDir(), filepath.Base(file))
stat, err := os.Stat(imagePath)
if err == nil && stat.Size() > 0 {
image, err := os.Open(imagePath)
if err != nil {
return err
}
defer image.Close()
if checksum != "" {
sha256 := sha256.New()
_, err = io.Copy(sha256, image)
if err != nil {
return err
}
result := fmt.Sprintf("%x", sha256.Sum(nil))
if result != hash {
return fmt.Errorf("Hash mismatch for %s: %s != %s", imagePath, result, hash)
}
}
return nil
}
image, err := os.Create(imagePath)
if err != nil {
return err
}
defer image.Close()
progress := func(progress ioprogress.ProgressData) {
fmt.Printf("%s\r", progress.Text)
}
_, err = lxd.DownloadFileSha256(&client, "", progress, nil, imagePath,
file, hash, image)
if err != nil {
if checksum == "" && strings.HasPrefix(err.Error(), "Hash mismatch") {
return nil
}
return err
}
fmt.Println("")
return nil
}
func downloadChecksum(URL string, fname string) (string, error) {
var client http.Client
tempFile, err := ioutil.TempFile(os.TempDir(), "sha256.")
if err != nil {
return "", err
}
defer os.Remove(tempFile.Name())
_, err = lxd.DownloadFileSha256(&client, "", nil, nil, "", URL, "", tempFile)
// ignore hash mismatch
if err != nil && !strings.HasPrefix(err.Error(), "Hash mismatch") {
return "", err
}
tempFile.Seek(0, 0)
scanner := bufio.NewScanner(tempFile)
for scanner.Scan() {
s := strings.Split(scanner.Text(), " ")
//if len(s) == 2 && s[1] == fmt.Sprintf("*%s", filepath.Base(fname)) {
matched, _ := regexp.MatchString(fmt.Sprintf(".*%s", filepath.Base(fname)), s[len(s)-1])
if matched {
return s[0], nil
}
}
return "", fmt.Errorf("Could not find checksum")
}

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shared/util.go Normal file
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package shared
import (
"io"
"os"
"os/exec"
)
// Copy copies a file.
func Copy(src, dest string) error {
var err error
srcFile, err := os.Open(src)
if err != nil {
return err
}
defer srcFile.Close()
destFile, err := os.Create(dest)
if err != nil {
return err
}
defer destFile.Close()
_, err = io.Copy(destFile, srcFile)
if err != nil {
return err
}
return destFile.Sync()
}
// RunCommand runs a command hereby setting the SHELL and PATH env variables,
// and redirecting the process's stdout and stderr to the real stdout and stderr
// respectively.
func RunCommand(name string, arg ...string) error {
cmd := exec.Command(name, arg...)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}

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package sources
import (
"fmt"
"os"
"path"
"path/filepath"
"strings"
"github.com/lxc/distrobuilder/shared"
lxd "github.com/lxc/lxd/shared"
)
// AlpineLinuxHTTP represents the debootstrap downloader.
type AlpineLinuxHTTP struct{}
// NewAlpineLinuxHTTP creates a new AlpineLinuxHTTP instance.
func NewAlpineLinuxHTTP() *AlpineLinuxHTTP {
return &AlpineLinuxHTTP{}
}
// Run runs debootstrap.
func (s *AlpineLinuxHTTP) Run(URL, release, variant, arch, cacheDir string) error {
realArch := arch
if arch == "amd64" {
realArch = "x86_64"
}
fname := fmt.Sprintf("alpine-minirootfs-%s-%s.tar.gz", release, arch)
// Download
parts := strings.Split("3.7.0", ".")
strings.Join(parts[0:2], ".")
err := shared.Download(URL+path.Join("/",
fmt.Sprintf("v%s", strings.Join(strings.Split(release, ".")[0:2], ".")),
"releases", realArch, fname), "")
if err != nil {
return err
}
err = os.MkdirAll(filepath.Join(cacheDir, "rootfs"), 0755)
if err != nil {
return err
}
// Unpack
err = lxd.Unpack(filepath.Join(os.TempDir(), fname), filepath.Join(cacheDir, "rootfs"), false, false)
if err != nil {
return err
}
return nil
}

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package sources
import (
"fmt"
"os"
"path"
"path/filepath"
"github.com/lxc/distrobuilder/shared"
lxd "github.com/lxc/lxd/shared"
)
// ArchLinuxHTTP represents the debootstrap downloader.
type ArchLinuxHTTP struct{}
// NewArchLinuxHTTP creates a new ArchLinuxHTTP instance.
func NewArchLinuxHTTP() *ArchLinuxHTTP {
return &ArchLinuxHTTP{}
}
// Run runs debootstrap.
func (s *ArchLinuxHTTP) Run(URL, release, variant, arch, cacheDir string) error {
fname := fmt.Sprintf("archlinux-bootstrap-%s-x86_64.tar.gz", release)
// Download
err := shared.Download(URL+path.Join("/", release, fname), "")
if err != nil {
return err
}
err = os.MkdirAll(cacheDir, 0755)
if err != nil {
return err
}
// Unpack
err = lxd.Unpack(filepath.Join(os.TempDir(), fname), cacheDir, false, false)
if err != nil {
return err
}
os.RemoveAll(filepath.Join(cacheDir, "rootfs"))
err = os.Rename(filepath.Join(cacheDir, "root.x86_64"), filepath.Join(cacheDir, "rootfs"))
if err != nil {
return err
}
return nil
}

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package sources
import (
"fmt"
"io/ioutil"
"net/http"
"os"
"path"
"path/filepath"
"regexp"
"strings"
"syscall"
"github.com/lxc/distrobuilder/shared"
)
// CentOSHTTP represents the CentOS HTTP downloader.
type CentOSHTTP struct {
fname string
cacheDir string
}
// NewCentOSHTTP creates a new CentOSHTTP instance.
func NewCentOSHTTP() *CentOSHTTP {
return &CentOSHTTP{}
}
// Run downloads the tarball and unpacks it.
func (s *CentOSHTTP) Run(URL, release, variant, arch, cacheDir string) error {
s.cacheDir = cacheDir
realArch := arch
if realArch == "amd64" {
realArch = "x86_64"
}
s.fname = getRelease(URL, release, variant, arch)
if s.fname == "" {
return fmt.Errorf("Couldn't get name of iso")
}
err := shared.Download(
URL+path.Join("/", strings.Split(release, ".")[0], "isos", arch, s.fname),
URL+path.Join("/", strings.Split(release, ".")[0], "isos", arch, "sha256sum.txt"))
if err != nil {
return fmt.Errorf("Error downloading CentOS image: %s", err)
}
return s.unpack(filepath.Join(os.TempDir(), s.fname), cacheDir)
}
func (s CentOSHTTP) unpack(filePath, cacheDir string) error {
isoDir := filepath.Join(os.TempDir(), "distrobuilder", "iso")
squashfsDir := filepath.Join(os.TempDir(), "distrobuilder", "squashfs")
tempRootDir := filepath.Join(os.TempDir(), "distrobuilder", "rootfs")
os.RemoveAll(filepath.Join(cacheDir, "rootfs"))
os.MkdirAll(isoDir, 0755)
os.MkdirAll(tempRootDir, 0755)
defer os.RemoveAll(filepath.Join(os.TempDir(), "distrobuilder"))
// this is easier than doing the whole loop thing ourselves
err := shared.RunCommand("mount", filePath, isoDir)
if err != nil {
return err
}
defer syscall.Unmount(isoDir, 0)
err = shared.RunCommand("unsquashfs", "-d", squashfsDir,
filepath.Join(isoDir, "LiveOS/squashfs.img"))
if err != nil {
return err
}
err = shared.RunCommand("mount", filepath.Join(squashfsDir, "LiveOS", "rootfs.img"), tempRootDir)
if err != nil {
return err
}
defer syscall.Unmount(tempRootDir, 0)
err = shared.RunCommand("rsync", "-qa", tempRootDir, cacheDir)
if err != nil {
return err
}
return nil
}
func getRelease(URL, release, variant, arch string) string {
resp, err := http.Get(URL + path.Join("/", strings.Split(release, ".")[0], "isos", arch))
if err != nil {
fmt.Fprintln(os.Stderr, err)
return ""
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
regex := regexp.MustCompile(fmt.Sprintf("CentOS-%s-%s-(?i:%s)(-\\d+)?.iso", release, arch, variant))
return regex.FindString(string(body))
}

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sources/debootstrap.go Normal file
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package sources
import (
"os"
"path/filepath"
"github.com/lxc/distrobuilder/shared"
)
// Debootstrap represents the debootstrap downloader.
type Debootstrap struct{}
// NewDebootstrap creates a new Debootstrap instance.
func NewDebootstrap() *Debootstrap {
return &Debootstrap{}
}
// Run runs debootstrap.
func (s *Debootstrap) Run(URL, release, variant, arch, cacheDir string) error {
var args []string
os.RemoveAll(filepath.Join(cacheDir, "rootfs"))
if variant != "" {
args = append(args, "--variant", variant)
}
if arch != arch {
args = append(args, "--arch", arch)
}
args = append(args, release, filepath.Join(cacheDir, "rootfs"))
if URL != "" {
args = append(args, URL)
}
return shared.RunCommand("debootstrap", args...)
}

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sources/source.go Normal file
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package sources
// A Downloader represents a source downloader.
type Downloader interface {
Run(string, string, string, string, string) error
}
// Get returns a Downloader.
func Get(name string) Downloader {
switch name {
case "ubuntu-http":
return NewUbuntuHTTP()
case "debootstrap":
return NewDebootstrap()
case "archlinux-http":
return NewArchLinuxHTTP()
case "centos-http":
return NewCentOSHTTP()
case "alpinelinux-http":
return NewAlpineLinuxHTTP()
}
return nil
}

83
sources/ubuntu-http.go Normal file
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package sources
import (
"fmt"
"io/ioutil"
"net/http"
"os"
"path"
"path/filepath"
"regexp"
"strings"
"github.com/lxc/distrobuilder/shared"
lxd "github.com/lxc/lxd/shared"
)
// UbuntuHTTP represents the Ubuntu HTTP downloader.
type UbuntuHTTP struct {
fname string
}
// NewUbuntuHTTP creates a new UbuntuHTTP instance.
func NewUbuntuHTTP() *UbuntuHTTP {
return &UbuntuHTTP{}
}
// Run downloads the tarball and unpacks it.
func (s *UbuntuHTTP) Run(URL, release, variant, arch, cacheDir string) error {
realArch := arch
if realArch == "x86_64" {
realArch = "amd64"
}
if strings.ContainsAny(release, "0123456789") {
s.fname = fmt.Sprintf("ubuntu-base-%s-base-%s.tar.gz", release, realArch)
} else {
// if release is non-numerical, find the latest release
s.fname = getLatestRelease(URL, release, realArch)
if s.fname == "" {
return fmt.Errorf("Couldn't find latest release")
}
}
err := shared.Download(
URL+path.Join("/", "releases", release, "release", s.fname),
URL+path.Join("/", "releases", release, "release", "SHA256SUMS"))
if err != nil {
return fmt.Errorf("Error downloading Ubuntu image: %s", err)
}
return s.unpack(filepath.Join(os.TempDir(), s.fname), filepath.Join(cacheDir, "rootfs"))
}
func (s UbuntuHTTP) unpack(filePath, rootDir string) error {
os.RemoveAll(rootDir)
os.MkdirAll(rootDir, 0755)
err := lxd.Unpack(filePath, rootDir, false, false)
if err != nil {
return fmt.Errorf("Failed to unpack tarball: %s", err)
}
return nil
}
func getLatestRelease(URL, release, arch string) string {
resp, err := http.Get(URL + path.Join("/", "releases", release, "release"))
if err != nil {
fmt.Fprintln(os.Stderr, err)
return ""
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
regex := regexp.MustCompile(fmt.Sprintf("ubuntu-base-\\d{2}\\.\\d{2}(\\.\\d+)?-base-%s.tar.gz", arch))
releases := regex.FindAllString(string(body), -1)
if len(releases) > 1 {
return string(releases[len(releases)-1])
}
return ""
}