Pass ssh flags to rsync

Resolves #19

main.go

@@ -84,7 +84,7 @@ chmod +x `+codeServerPath+`
 		flog.Info("synced settings in %s", time.Since(start))
 
 		flog.Info("syncing extensions")
-		err = syncExtensions(host)
+		err = syncExtensions(host, *sshFlags)
 		if err != nil {
 			flog.Fatal("failed to sync extensions: %v", err)
 		}
@@ -208,24 +208,24 @@ func syncUserSettings(host string) error {
 	return rsync(localConfDir+"/", remoteSettingsDir, host, "workspaceStorage", "logs", "CachedData")
 }
 
-func syncExtensions(host string) error {
+func syncExtensions(host string, sshFlags string) error {
 	localExtensionsDir, err := extensionsDir()
 	if err != nil {
 		return err
 	}
 	const remoteExtensionsDir = ".local/share/code-server/extensions"
 
-	return rsync(localExtensionsDir+"/", remoteExtensionsDir, host)
+	return rsync(localExtensionsDir+"/", remoteExtensionsDir, sshFlags, host)
 }
 
-func rsync(src string, dest string, host string, excludePaths ...string) error {
+func rsync(src string, dest string, host string, sshFlags string, excludePaths ...string) error {
 	remoteDest := fmt.Sprintf("%s:%s", host, dest)
 	excludeFlags := make([]string, len(excludePaths))
 	for i, path := range excludePaths {
 		excludeFlags[i] = "--exclude=" + path
 	}
 
-	cmd := exec.Command("rsync", append(excludeFlags, "-azv", "--copy-unsafe-links", src, remoteDest)...)
+	cmd := exec.Command("rsync", append(excludeFlags, "-e", "ssh "+sshFlags, "-azv", "--copy-unsafe-links", src, remoteDest)...)
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
 	err := cmd.Run()