AdGuardHome/control_update.go

372 lines
9.7 KiB
Go

package main
import (
"archive/zip"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"syscall"
"time"
"github.com/AdguardTeam/golibs/log"
)
// Convert version.json data to our JSON response
func getVersionResp(data []byte) []byte {
versionJSON := make(map[string]interface{})
err := json.Unmarshal(data, &versionJSON)
if err != nil {
log.Error("version.json: %s", err)
return []byte{}
}
ret := make(map[string]interface{})
ret["can_autoupdate"] = false
var ok1, ok2, ok3 bool
ret["new_version"], ok1 = versionJSON["version"].(string)
ret["announcement"], ok2 = versionJSON["announcement"].(string)
ret["announcement_url"], ok3 = versionJSON["announcement_url"].(string)
if !ok1 || !ok2 || !ok3 {
log.Error("version.json: invalid data")
return []byte{}
}
_, ok := versionJSON[fmt.Sprintf("download_%s_%s", runtime.GOOS, runtime.GOARCH)]
if ok && ret["new_version"] != VersionString {
ret["can_autoupdate"] = true
}
d, _ := json.Marshal(ret)
return d
}
// Get the latest available version from the Internet
func handleGetVersionJSON(w http.ResponseWriter, r *http.Request) {
log.Tracef("%s %v", r.Method, r.URL)
now := time.Now()
controlLock.Lock()
cached := now.Sub(versionCheckLastTime) <= versionCheckPeriod && len(versionCheckJSON) != 0
data := versionCheckJSON
controlLock.Unlock()
if cached {
// return cached copy
w.Header().Set("Content-Type", "application/json")
w.Write(getVersionResp(data))
return
}
resp, err := client.Get(versionCheckURL)
if err != nil {
httpError(w, http.StatusBadGateway, "Couldn't get version check json from %s: %T %s\n", versionCheckURL, err, err)
return
}
if resp != nil && resp.Body != nil {
defer resp.Body.Close()
}
// read the body entirely
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
httpError(w, http.StatusBadGateway, "Couldn't read response body from %s: %s", versionCheckURL, err)
return
}
controlLock.Lock()
versionCheckLastTime = now
versionCheckJSON = body
controlLock.Unlock()
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(getVersionResp(body))
if err != nil {
httpError(w, http.StatusInternalServerError, "Couldn't write body: %s", err)
}
}
// Copy file on disk
func copyFile(src, dst string) error {
d, e := ioutil.ReadFile(src)
if e != nil {
return e
}
e = ioutil.WriteFile(dst, d, 0644)
if e != nil {
return e
}
return nil
}
type updateInfo struct {
pkgURL string // URL for the new package
pkgName string // Full path to package file
newVer string // New version string
updateDir string // Full path to the directory containing unpacked files from the new package
backupDir string // Full path to backup directory
configName string // Full path to the current configuration file
updateConfigName string // Full path to the configuration file to check by the new binary
curBinName string // Full path to the current executable file
bkpBinName string // Full path to the current executable file in backup directory
newBinName string // Full path to the new executable file
}
// Fill in updateInfo object
func getUpdateInfo(jsonData []byte) (*updateInfo, error) {
var u updateInfo
workDir := config.ourWorkingDir
versionJSON := make(map[string]interface{})
err := json.Unmarshal(jsonData, &versionJSON)
if err != nil {
return nil, fmt.Errorf("JSON parse: %s", err)
}
u.pkgURL = versionJSON[fmt.Sprintf("download_%s_%s", runtime.GOOS, runtime.GOARCH)].(string)
u.newVer = versionJSON["version"].(string)
if len(u.pkgURL) == 0 || len(u.newVer) == 0 {
return nil, fmt.Errorf("Invalid JSON")
}
if u.newVer == VersionString {
return nil, fmt.Errorf("No need to update")
}
_, pkgFileName := filepath.Split(u.pkgURL)
if len(pkgFileName) == 0 {
return nil, fmt.Errorf("Invalid JSON")
}
u.pkgName = filepath.Join(workDir, pkgFileName)
u.updateDir = filepath.Join(workDir, fmt.Sprintf("update-%s", u.newVer))
u.backupDir = filepath.Join(workDir, fmt.Sprintf("backup-%s", VersionString))
u.configName = config.getConfigFilename()
u.updateConfigName = filepath.Join(u.updateDir, "AdGuardHome", "AdGuardHome.yaml")
if strings.HasSuffix(pkgFileName, ".zip") {
u.updateConfigName = filepath.Join(u.updateDir, "AdGuardHome.yaml")
}
binName := "AdGuardHome"
if runtime.GOOS == "windows" {
binName = "AdGuardHome.exe"
}
u.curBinName = filepath.Join(workDir, binName)
u.bkpBinName = filepath.Join(u.backupDir, binName)
u.newBinName = filepath.Join(u.updateDir, "AdGuardHome", binName)
if strings.HasSuffix(pkgFileName, ".zip") {
u.newBinName = filepath.Join(u.updateDir, binName)
}
return &u, nil
}
// Unpack all files from .zip file to the specified directory
func zipFileUnpack(zipfile, outdir string) error {
r, err := zip.OpenReader(zipfile)
if err != nil {
return fmt.Errorf("zip.OpenReader(): %s", err)
}
defer r.Close()
for _, zf := range r.File {
zr, err := zf.Open()
if err != nil {
return fmt.Errorf("zip file Open(): %s", err)
}
fi := zf.FileInfo()
fn := filepath.Join(outdir, fi.Name())
if fi.IsDir() {
err = os.Mkdir(fn, fi.Mode())
if err != nil {
return fmt.Errorf("zip file Read(): %s", err)
}
continue
}
f, err := os.OpenFile(fn, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, fi.Mode())
if err != nil {
zr.Close()
return fmt.Errorf("os.OpenFile(): %s", err)
}
_, err = io.Copy(f, zr)
if err != nil {
zr.Close()
return fmt.Errorf("io.Copy(): %s", err)
}
zr.Close()
}
return nil
}
// Unpack all files from .tar.gz file to the specified directory
func targzFileUnpack(tarfile, outdir string) error {
cmd := exec.Command("tar", "zxf", tarfile, "-C", outdir)
log.Tracef("Unpacking: %v", cmd.Args)
_, err := cmd.Output()
if err != nil || cmd.ProcessState.ExitCode() != 0 {
return fmt.Errorf("exec.Command() failed: %s", err)
}
return nil
}
// Perform an update procedure
func doUpdate(u *updateInfo) error {
log.Info("Updating from %s to %s. URL:%s Package:%s",
VersionString, u.newVer, u.pkgURL, u.pkgName)
resp, err := client.Get(u.pkgURL)
if err != nil {
return fmt.Errorf("HTTP request failed: %s", err)
}
if resp != nil && resp.Body != nil {
defer resp.Body.Close()
}
log.Tracef("Reading HTTP body")
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("ioutil.ReadAll() failed: %s", err)
}
log.Tracef("Saving package to file")
err = ioutil.WriteFile(u.pkgName, body, 0644)
if err != nil {
return fmt.Errorf("ioutil.WriteFile() failed: %s", err)
}
log.Tracef("Unpacking the package")
_ = os.Mkdir(u.updateDir, 0755)
_, file := filepath.Split(u.pkgName)
if strings.HasSuffix(file, ".zip") {
err = zipFileUnpack(u.pkgName, u.updateDir)
if err != nil {
return fmt.Errorf("zipFileUnpack() failed: %s", err)
}
} else if strings.HasSuffix(file, ".tar.gz") {
err = targzFileUnpack(u.pkgName, u.updateDir)
if err != nil {
return fmt.Errorf("zipFileUnpack() failed: %s", err)
}
} else {
return fmt.Errorf("Unknown package extension")
}
log.Tracef("Checking configuration")
err = copyFile(u.configName, u.updateConfigName)
if err != nil {
return fmt.Errorf("copyFile() failed: %s", err)
}
cmd := exec.Command(u.newBinName, "--check-config")
err = cmd.Run()
if err != nil || cmd.ProcessState.ExitCode() != 0 {
return fmt.Errorf("exec.Command(): %s %d", err, cmd.ProcessState.ExitCode())
}
log.Tracef("Backing up the current configuration")
_ = os.Mkdir(u.backupDir, 0755)
err = copyFile(u.configName, filepath.Join(u.backupDir, "AdGuardHome.yaml"))
if err != nil {
return fmt.Errorf("copyFile() failed: %s", err)
}
log.Tracef("Renaming: %s -> %s", u.curBinName, u.bkpBinName)
err = os.Rename(u.curBinName, u.bkpBinName)
if err != nil {
return err
}
if runtime.GOOS == "windows" {
// rename fails with "File in use" error
err = copyFile(u.newBinName, u.curBinName)
} else {
err = os.Rename(u.newBinName, u.curBinName)
}
if err != nil {
return err
}
log.Tracef("Renamed: %s -> %s", u.newBinName, u.curBinName)
_ = os.Remove(u.pkgName)
// _ = os.RemoveAll(u.updateDir)
return nil
}
// Complete an update procedure
func finishUpdate(u *updateInfo) {
log.Info("Stopping all tasks")
cleanup()
stopHTTPServer()
cleanupAlways()
if runtime.GOOS == "windows" {
if config.runningAsService {
// Note:
// we can't restart the service via "kardianos/service" package - it kills the process first
// we can't start a new instance - Windows doesn't allow it
cmd := exec.Command("cmd", "/c", "net stop AdGuardHome & net start AdGuardHome")
err := cmd.Start()
if err != nil {
log.Fatalf("exec.Command() failed: %s", err)
}
os.Exit(0)
}
cmd := exec.Command(u.curBinName, os.Args[1:]...)
log.Info("Restarting: %v", cmd.Args)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Start()
if err != nil {
log.Fatalf("exec.Command() failed: %s", err)
}
os.Exit(0)
} else {
log.Info("Restarting: %v", os.Args)
err := syscall.Exec(u.curBinName, os.Args, os.Environ())
if err != nil {
log.Fatalf("syscall.Exec() failed: %s", err)
}
// Unreachable code
}
}
// Perform an update procedure to the latest available version
func handleUpdate(w http.ResponseWriter, r *http.Request) {
log.Tracef("%s %v", r.Method, r.URL)
if len(versionCheckJSON) == 0 {
httpError(w, http.StatusBadRequest, "/update request isn't allowed now")
return
}
u, err := getUpdateInfo(versionCheckJSON)
if err != nil {
httpError(w, http.StatusInternalServerError, "%s", err)
return
}
err = doUpdate(u)
if err != nil {
httpError(w, http.StatusInternalServerError, "%s", err)
return
}
returnOK(w)
time.Sleep(time.Second) // wait (hopefully) until response is sent (not sure whether it's really necessary)
go finishUpdate(u)
}