/
main.go
215 lines (191 loc) · 4.59 KB
/
main.go
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// Copyright 2013-2014 Canonical Ltd.
// godeb dynamically translates stock upstream Go tarballs to deb packages.
//
// For details of how this tool works and context for why it was built,
// please refer to the following blog post:
//
// http://blog.labix.org/2013/06/15/in-flight-deb-packages-of-go
//
package main
import (
"encoding/json"
"fmt"
"go/build"
"net/http"
"os"
"os/exec"
"sort"
"strings"
)
var usage = `Usage: godeb <command> [<options> ...]
Available commands:
list
install [<version>]
download [<version>]
remove
`
func main() {
if err := run(); err != nil {
fmt.Fprintln(os.Stderr, "error:", err)
os.Exit(1)
}
}
func run() error {
if len(os.Args) == 2 && (os.Args[1] == "-h" || os.Args[1] == "--help") {
fmt.Println(usage)
return nil
}
if len(os.Args) < 2 {
fmt.Println(usage)
return fmt.Errorf("command missing")
}
if strings.HasPrefix(os.Args[1], "-") {
return fmt.Errorf("unknown option: %s", os.Args[1])
}
switch command := os.Args[1]; command {
case "list":
if len(os.Args) > 2 {
return fmt.Errorf("list command takes no arguments")
}
return listCommand()
case "download", "install":
version := ""
if len(os.Args) == 3 {
version = os.Args[2]
} else if len(os.Args) > 3 {
return fmt.Errorf("too many arguments to %s command", command)
}
return actionCommand(version, command == "install")
case "remove":
return removeCommand()
default:
return fmt.Errorf("unknown command: %s", os.Args[1])
}
return nil
}
func listCommand() error {
tbs, err := tarballs()
if err != nil {
return err
}
for _, tb := range tbs {
fmt.Println(tb.Version)
}
return nil
}
func removeCommand() error {
args := []string{"dpkg", "--purge", "go"}
if os.Getuid() != 0 {
args = append([]string{"sudo"}, args...)
}
cmd := exec.Command(args[0], args[1:]...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
return fmt.Errorf("while removing go package: %v", err)
}
return nil
}
func actionCommand(version string, install bool) error {
tbs, err := tarballs()
if err != nil {
return err
}
var url string
if version == "" {
version = tbs[0].Version
url = tbs[0].URL
} else {
for _, tb := range tbs {
if version == tb.Version {
url = tb.URL
break
}
}
}
installed, err := installedDebVersion()
if err == errNotInstalled {
// that's okay
} else if err != nil {
return err
} else if install && debVersion(version) == installed {
return fmt.Errorf("go version %s is already installed", version)
}
fmt.Println("processing", url)
resp, err := http.Get(url)
if err != nil {
return fmt.Errorf("failed to download %s: %v", url, err)
}
if resp.StatusCode != 200 {
return fmt.Errorf("got status code %d", resp.StatusCode)
}
defer resp.Body.Close()
debName := fmt.Sprintf("go_%s_%s.deb", debVersion(version), debArch())
deb, err := os.Create(debName + ".inprogress")
if err != nil {
return fmt.Errorf("cannot create deb: %v", err)
}
defer deb.Close()
if err := createDeb(version, resp.Body, deb); err != nil {
return err
}
if err := os.Rename(debName+".inprogress", debName); err != nil {
return err
}
fmt.Println("package", debName, "ready")
if install {
args := []string{"dpkg", "-i", debName}
if os.Getuid() != 0 {
args = append([]string{"sudo"}, args...)
}
cmd := exec.Command(args[0], args[1:]...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
return fmt.Errorf("while installing go package: %v", err)
}
}
return nil
}
type Tarball struct {
URL string
Version string
}
type GolangDlFile struct {
Arch string `json:"arch"`
Filename string `json:"filename"`
Os string `json:"os"`
Version string `json:"version"`
}
type GolangDlVersion struct {
Version string `json:"version"`
Files []GolangDlFile `json:"files"`
}
// REST API described in https://github.com/golang/website/blob/master/internal/dl/dl.go
func tarballs() ([]*Tarball, error) {
url := "https://golang.org/dl/?mode=json&include=all"
downloadBaseURL := "https://dl.google.com/go/"
resp, err := http.Get(url)
if err != nil {
return nil, err
}
var versions []GolangDlVersion
err = json.NewDecoder(resp.Body).Decode(&versions)
if err != nil {
return nil, err
}
var tbs []*Tarball
for _, v := range versions {
for _, f := range v.Files {
if f.Os == build.Default.GOOS && f.Arch == build.Default.GOARCH {
t := Tarball{
Version: strings.TrimPrefix(f.Version, "go"),
URL: downloadBaseURL + f.Filename}
tbs = append(tbs, &t)
break
}
}
}
sort.Sort(sort.Reverse(tarballSlice(tbs)))
return tbs, nil
}