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package updates
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"os"
"path/filepath"
"runtime"
"github.com/kardianos/osext"
"github.com/Sirupsen/logrus"
getter "github.com/hashicorp/go-getter"
"github.com/jesseduffield/lazygit/pkg/commands"
"github.com/jesseduffield/lazygit/pkg/config"
)
// Update checks for updates and does updates
type Updater struct {
LastChecked string
Log *logrus.Logger
Config config.AppConfigurer
NewVersion string
OSCommand *commands.OSCommand
}
// Updater implements the check and update methods
type Updaterer interface {
CheckForNewUpdate()
Update()
}
var (
projectUrl = "https://github.com/jesseduffield/lazygit"
)
// NewUpdater creates a new updater
func NewUpdater(log *logrus.Logger, config config.AppConfigurer, osCommand *commands.OSCommand) (*Updater, error) {
updater := &Updater{
LastChecked: "today",
Log: log,
Config: config,
OSCommand: osCommand,
}
return updater, nil
}
func (u *Updater) getLatestVersionNumber() (string, error) {
req, err := http.NewRequest("GET", projectUrl+"/releases/latest", nil)
if err != nil {
return "", err
}
req.Header.Set("Accept", "application/json")
resp, err := http.DefaultClient.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
byt := []byte(body)
var dat map[string]interface{}
if err := json.Unmarshal(byt, &dat); err != nil {
return "", err
}
return dat["tag_name"].(string), nil
}
// CheckForNewUpdate checks if there is an available update
func (u *Updater) CheckForNewUpdate() (string, error) {
u.Log.Info("Checking for an updated version")
if u.Config.GetVersion() == "unversioned" {
u.Log.Info("Current version is not built from an official release so we won't check for an update")
return "", nil
}
newVersion, err := u.getLatestVersionNumber()
if err != nil {
return "", err
}
u.NewVersion = newVersion
u.Log.Info("Current version is " + u.Config.GetVersion())
u.Log.Info("New version is " + newVersion)
if newVersion == u.Config.GetVersion() {
return "", nil
}
// TODO: verify here that there is a binary available for this OS/arch
return newVersion, nil
}
func (u *Updater) mappedOs(os string) string {
osMap := map[string]string{
"darwin": "Darwin",
"linux": "Linux",
"windows": "Windows",
}
result, found := osMap[os]
if found {
return result
}
return os
}
func (u *Updater) mappedArch(arch string) string {
archMap := map[string]string{
"386": "32-bit",
"amd64": "x86_64",
}
result, found := archMap[arch]
if found {
return result
}
return arch
}
// example: https://github.com/jesseduffield/lazygit/releases/download/v0.1.73/lazygit_0.1.73_Darwin_x86_64.tar.gz
func (u *Updater) getBinaryUrl() (string, error) {
if u.NewVersion == "" {
return "", errors.New("Must run CheckForUpdate() before running getBinaryUrl() to get the new version number")
}
extension := "tar.gz"
if runtime.GOOS == "windows" {
extension = "zip"
}
url := fmt.Sprintf(
"%s/releases/download/%s/lazygit_%s_%s_%s.%s",
projectUrl,
u.NewVersion,
u.NewVersion[1:],
u.mappedOs(runtime.GOOS),
u.mappedArch(runtime.GOARCH),
extension,
)
u.Log.Info("url for latest release is " + url)
return url, nil
}
func (u *Updater) Update() error {
rawUrl, err := u.getBinaryUrl()
if err != nil {
return err
}
return u.downloadAndInstall(rawUrl)
}
func (u *Updater) downloadAndInstall(rawUrl string) error {
url, err := url.Parse(rawUrl)
if err != nil {
panic(err)
}
g := new(getter.HttpGetter)
tempDir, err := ioutil.TempDir("", "lazygit")
if err != nil {
panic(err)
}
defer os.RemoveAll(tempDir)
// Get it!
if err := g.Get(tempDir, url); err != nil {
panic(err)
}
extension := ""
if runtime.GOOS == "windows" {
extension = ".exe"
}
// Verify the main file exists
tempPath := filepath.Join(tempDir, "lazygit"+extension)
if _, err := os.Stat(tempPath); err != nil {
panic(err)
}
// get the path of the current binary
execPath, err := osext.Executable()
if err != nil {
panic(err)
}
// swap out the old binary for the new one
err = os.Rename(tempPath, execPath+"2")
if err != nil {
panic(err)
}
return nil
}
|
