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package main
import (
"context"
"fmt"
"math/rand"
"net"
"net/http"
"os"
"os/exec"
"os/signal"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/pkg/browser"
"go.coder.com/flog"
"golang.org/x/xerrors"
)
const codeServerPath = "~/.cache/sshcode/sshcode-server"
type options struct {
skipSync bool
syncBack bool
localPort string
remotePort string
sshFlags string
}
func sshCode(host, dir string, o options) error {
flog.Info("ensuring code-server is updated...")
host, extraSSHFlags, err := parseIP(host)
if err != nil {
return xerrors.Errorf("failed to parse host IP: %w", err)
}
if extraSSHFlags != "" {
o.sshFlags = strings.Join([]string{extraSSHFlags, o.sshFlags}, " ")
}
dlScript := downloadScript(codeServerPath)
// Downloads the latest code-server and allows it to be executed.
sshCmdStr := fmt.Sprintf("ssh %v %v /bin/bash", o.sshFlags, host)
sshCmd := exec.Command("sh", "-c", sshCmdStr)
sshCmd.Stdout = os.Stdout
sshCmd.Stderr = os.Stderr
sshCmd.Stdin = strings.NewReader(dlScript)
err = sshCmd.Run()
if err != nil {
return xerrors.Errorf("failed to update code-server: \n---ssh cmd---\n%s\n---download script---\n%s: %w",
sshCmdStr,
dlScript,
err,
)
}
if !o.skipSync {
start := time.Now()
flog.Info("syncing settings")
err = syncUserSettings(o.sshFlags, host, false)
if err != nil {
return xerrors.Errorf("failed to sync settings: %w", err)
}
flog.Info("synced settings in %s", time.Since(start))
flog.Info("syncing extensions")
err = syncExtensions(o.sshFlags, host, false)
if err != nil {
return xerrors.Errorf("failed to sync extensions: %w", err)
}
flog.Info("synced extensions in %s", time.Since(start))
}
flog.Info("starting code-server...")
if o.localPort == "" {
o.localPort, err = randomPort()
}
if err != nil {
return xerrors.Errorf("failed to find available local port: %w", err)
}
if o.remotePort == "" {
o.remotePort, err = randomPort()
}
if err != nil {
return xerrors.Errorf("failed to find available remote port: %w", err)
}
flog.Info("Tunneling local port %v to remote port %v", o.localPort, o.remotePort)
sshCmdStr = fmt.Sprintf("ssh -tt -q -L %v %v %v 'cd %v; %v --host 127.0.0.1 --allow-http --no-auth --port=%v'",
o.localPort+":localhost:"+o.remotePort, o.sshFlags, host, dir, codeServerPath, o.remotePort,
)
// Starts code-server and forwards the remote port.
sshCmd = exec.Command("sh", "-c", sshCmdStr)
sshCmd.Stdin = os.Stdin
sshCmd.Stdout = os.Stdout
sshCmd.Stderr = os.Stderr
err = sshCmd.Start()
if err != nil {
return xerrors.Errorf("failed to start code-server: %w", err)
}
url := "http://127.0.0.1:" + o.localPort
ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
defer cancel()
client := http.Client{
Timeout: time.Second * 3,
}
for {
if ctx.Err() != nil {
return xerrors.Errorf("code-server didn't start in time: %w", ctx.Err())
}
// Waits for code-server to be available before opening the browser.
resp, err := client.Get(url)
if err != nil {
continue
}
resp.Body.Close()
break
}
ctx, cancel = context.WithCancel(context.Background())
if os.Getenv("DISPLAY") != "" {
openBrowser(url)
}
go func() {
defer cancel()
sshCmd.Wait()
}()
c := make(chan os.Signal)
signal.Notify(c, os.Interrupt)
select {
case <-ctx.Done():
case <-c:
}
if !o.syncBack || o.skipSync {
flog.Info("shutting down")
return nil
}
flog.Info("synchronizing VS Code back to local")
err = syncExtensions(o.sshFlags, host, true)
if err != nil {
return xerrors.Errorf("failed to sync extensions back: %w", err)
}
err = syncUserSettings(o.sshFlags, host, true)
if err != nil {
return xerrors.Errorf("failed to sync user settings settings back: %w", err)
}
return nil
}
func openBrowser(url string) {
var openCmd *exec.Cmd
const (
macPath = "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"
wslPath = "/mnt/c/Program Files (x86)/Google/Chrome/Application/chrome.exe"
)
switch {
case commandExists("google-chrome"):
openCmd = exec.Command("google-chrome", chromeOptions(url)...)
case commandExists("google-chrome-stable"):
openCmd = exec.Command("google-chrome-stable", chromeOptions(url)...)
case commandExists("chromium"):
openCmd = exec.Command("chromium", chromeOptions(url)...)
case commandExists("chromium-browser"):
openCmd = exec.Command("chromium-browser", chromeOptions(url)...)
case pathExists(macPath):
openCmd = exec.Command(macPath, chromeOptions(url)...)
case pathExists(wslPath):
openCmd = exec.Command(wslPath, chromeOptions(url)...)
default:
err := browser.OpenURL(url)
if err != nil {
flog.Error("failed to open browser: %v", err)
}
return
}
// We do not use CombinedOutput because if there is no chrome instance, this will block
// and become the parent process instead of using an existing chrome instance.
err := openCmd.Start()
if err != nil {
flog.Error("failed to open browser: %v", err)
}
}
func chromeOptions(url string) []string {
return []string{"--app=" + url, "--disable-extensions", "--disable-plugins", "--incognito"}
}
// Checks if a command exists locally.
func commandExists(name string) bool {
_, err := exec.LookPath(name)
return err == nil
}
func pathExists(name string) bool {
_, err := os.Stat(name)
return err == nil
}
// randomPort picks a random port to start code-server on.
func randomPort() (string, error) {
const (
minPort = 1024
maxPort = 65535
maxTries = 10
)
for i := 0; i < maxTries; i++ {
port := rand.Intn(maxPort-minPort+1) + minPort
l, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
if err == nil {
_ = l.Close()
return strconv.Itoa(port), nil
}
flog.Info("port taken: %d", port)
}
return "", xerrors.Errorf("max number of tries exceeded: %d", maxTries)
}
func syncUserSettings(sshFlags string, host string, back bool) error {
localConfDir, err := configDir()
if err != nil {
return err
}
err = ensureDir(localConfDir)
if err != nil {
return err
}
const remoteSettingsDir = "~/.local/share/code-server/User/"
var (
src = localConfDir + "/"
dest = host + ":" + remoteSettingsDir
)
if back {
dest, src = src, dest
}
// Append "/" to have rsync copy the contents of the dir.
return rsync(src, dest, sshFlags, "workspaceStorage", "logs", "CachedData")
}
func syncExtensions(sshFlags string, host string, back bool) error {
localExtensionsDir, err := extensionsDir()
if err != nil {
return err
}
err = ensureDir(localExtensionsDir)
if err != nil {
return err
}
const remoteExtensionsDir = "~/.local/share/code-server/extensions/"
var (
src = localExtensionsDir + "/"
dest = host + ":" + remoteExtensionsDir
)
if back {
dest, src = src, dest
}
return rsync(src, dest, sshFlags)
}
func rsync(src string, dest string, sshFlags string, excludePaths ...string) error {
excludeFlags := make([]string, len(excludePaths))
for i, path := range excludePaths {
excludeFlags[i] = "--exclude=" + path
}
cmd := exec.Command("rsync", append(excludeFlags, "-azvr",
"-e", "ssh "+sshFlags,
// Only update newer directories, and sync times
// to keep things simple.
"-u", "--times",
// This is more unsafe, but it's obnoxious having to enter VS Code
// locally in order to properly delete an extension.
"--delete",
"--copy-unsafe-links",
src, dest,
)...,
)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Run()
if err != nil {
return xerrors.Errorf("failed to rsync '%s' to '%s': %w", src, dest, err)
}
return nil
}
func downloadScript(codeServerPath string) string {
return fmt.Sprintf(
`set -euxo pipefail || exit 1
mkdir -p ~/.local/share/code-server %v
cd %v
wget -N https://codesrv-ci.cdr.sh/latest-linux
[ -f %v ] && rm %v
ln latest-linux %v
chmod +x %v`,
filepath.Dir(codeServerPath),
filepath.Dir(codeServerPath),
codeServerPath,
codeServerPath,
codeServerPath,
codeServerPath,
)
}
// ensureDir creates a directory if it does not exist.
func ensureDir(path string) error {
_, err := os.Stat(path)
if os.IsNotExist(err) {
err = os.MkdirAll(path, 0750)
}
if err != nil {
return err
}
return nil
}
// parseIP parses the host to a valid IP address. If 'gcp:' is prefixed to the
// host then a lookup is done using gcloud to determine the external IP and any
// additional SSH arguments that should be used for ssh commands.
func parseIP(host string) (ip string, additionalFlags string, err error) {
host = strings.TrimSpace(host)
switch {
case strings.HasPrefix(host, "gcp:"):
instance := strings.TrimPrefix(host, "gcp:")
return parseGCPSSHCmd(instance)
default:
if net.ParseIP(host) == nil {
return "", "", xerrors.New("host argument is not a valid IP address")
}
return host, "", nil
}
}
// parseGCPSSHCmd parses the IP address and flags used by 'gcloud' when
// ssh'ing to an instance.
func parseGCPSSHCmd(instance string) (ip, sshFlags string, err error) {
dryRunCmd := fmt.Sprintf("gcloud compute ssh --dry-run %v", instance)
out, err := exec.Command("sh", "-c", dryRunCmd).CombinedOutput()
if err != nil {
return "", "", xerrors.Errorf("%s: %w", out, err)
}
toks := strings.Split(string(out), " ")
if len(toks) < 2 {
return "", "", xerrors.Errorf("unexpected output for '%v' command, %s", dryRunCmd, out)
}
// Slice off the '/usr/bin/ssh' prefix and the '<user>@<ip>' suffix.
sshFlags = strings.Join(toks[1:len(toks)-1], " ")
// E.g. [email protected].
userIP := toks[len(toks)-1]
toks = strings.Split(userIP, "@")
// Assume the '<user>@' is missing.
if len(toks) < 2 {
ip = strings.TrimSpace(toks[0])
} else {
ip = strings.TrimSpace(toks[1])
}
if net.ParseIP(ip) == nil {
return "", "", xerrors.Errorf("parsed invalid ip address %v", ip)
}
return ip, sshFlags, nil
}