Progress on sandbox, drop node-pty dependency

README.md

@@ -67,4 +67,5 @@ Absolutely, please see [Contributing guide](CONTRIBUTING.md).
   [Monaco](https://github.com/microsoft/monaco-editor),
   [node-pty](https://github.com/microsoft/node-pty), and
   [Xterm.js](https://github.com/xtermjs/xterm.js/)! Without any one of
-  these open-source libraries, the core of Riju could not exist.
+  these open-source libraries, version 1.0 of Riju could not have come
+  to life!

backend/sandbox.js

@@ -2,8 +2,6 @@ import { spawn } from "child_process";
 import { promises as fs } from "fs";
 import process from "process";
 
-import pty from "node-pty";
-
 import { readLangConfig } from "../lib/yaml.js";
 import {
   bash,
@@ -34,15 +32,15 @@ async function main() {
   const uuid = getUUID();
   console.log(`Starting session with UUID ${uuid}`);
   const sessionArgs = privilegedSession({ uuid, lang });
-  const session = pty.spawn(sessionArgs[0], sessionArgs.slice(1), {
+  const session = spawn(sessionArgs[0], sessionArgs.slice(1), {
-    name: "xterm-color",
+    stdio: ["ignore", "pipe", "inherit"],
   });
   let buffer = "";
   await new Promise((resolve) => {
-    session.on("data", (data) => {
+    session.stdout.on("data", (data) => {
-      buffer += data;
+      buffer += data.toString();
       let idx;
-      while ((idx = buffer.indexOf("\r\n")) !== -1) {
+      while ((idx = buffer.indexOf("\n")) !== -1) {
         const line = buffer.slice(0, idx);
         buffer = buffer.slice(idx + 2);
         if (line === "riju: container ready") {

package.json

@@ -27,7 +27,6 @@
     "monaco-editor": "0.20.0",
     "monaco-editor-webpack-plugin": "1.9.0",
     "monaco-languageclient": "0.13.0",
-    "node-pty": "^0.9.0",
     "p-queue": "^6.6.2",
     "parse-passwd": "^1.0.0",
     "prettier": "^2.3.1",

system/src/riju-pty.c

@@ -22,7 +22,7 @@ void die_with_usage() { die("usage: riju-pty CMDLINE..."); }
 
 struct termios orig_termios;
 
-void cleanup()
+void restore_tty()
 {
   if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios) < 0)
     die("tcsetattr failed");
@@ -42,18 +42,23 @@ int main(int argc, char **argv)
   char *pty_slave_name = ptsname(pty_master_fd);
   if (pty_slave_name == NULL)
     die("ptsname failed");
-  if (tcgetattr(STDIN_FILENO, &orig_termios) < 0)
+  if (isatty(STDIN_FILENO)) {
-    die("tcgetattr failed");
+    if (tcgetattr(STDIN_FILENO, &orig_termios) < 0)
-  struct termios raw = orig_termios;
+      die("tcgetattr failed");
-  // https://viewsourcecode.org/snaptoken/kilo/02.enteringRawMode.html
+    struct termios raw = orig_termios;
-  raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
+    // https://viewsourcecode.org/snaptoken/kilo/02.enteringRawMode.html
-  raw.c_oflag &= ~(OPOST);
+    raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
-  raw.c_cflag |= (CS8);
+    raw.c_oflag &= ~(OPOST);
-  raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
+    raw.c_cflag |= (CS8);
-  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) < 0)
+    raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
-    die("tcsetattr failed");
+    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) < 0)
-  if (atexit(cleanup) < 0)
+      die("tcsetattr failed");
-    die("atexit failed");
+    if (atexit(restore_tty) < 0)
+      die("atexit failed");
+  } else {
+    if (errno != ENOTTY)
+      die("isatty failed");
+  }
   pid_t exec_pid = fork();
   if (exec_pid < 0)
     die("fork failed");

system/src/riju-system-privileged.c

@@ -134,6 +134,8 @@ void wait_alarm(int signum)
 
 void session(char *uuid, char *lang, char *imageHash)
 {
+  if (setvbuf(stdout, NULL, _IONBF, 0) != 0)
+    die("setvbuf failed");
   char *image, *container, *hostname, *share, *volume, *fifo, *rijuPtyPath;
   if ((imageHash != NULL ? asprintf(&image, "riju:lang-%s-%s", lang, imageHash)
                          : asprintf(&image, "riju:lang-%s", lang)) < 0)

yarn.lock

@@ -3105,7 +3105,7 @@ ms@2.1.2:
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.2.tgz#d09d1f357b443f493382a8eb3ccd183872ae6009"
   integrity sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==
 
-nan@^2.12.1, nan@^2.14.0:
+nan@^2.12.1:
   version "2.14.2"
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.14.2.tgz#f5376400695168f4cc694ac9393d0c9585eeea19"
   integrity sha512-M2ufzIiINKCuDfBSAUr1vWQ+vuVcA9kqx8JJUsbQi6yf1uGRyb7HfpdfUr5qLXf3B/t8dPvcjhKMmlfnP47EzQ==
@@ -3171,13 +3171,6 @@ node-libs-browser@^2.2.1:
     util "^0.11.0"
     vm-browserify "^1.0.1"
 
-node-pty@^0.9.0:
-  version "0.9.0"
-  resolved "https://registry.yarnpkg.com/node-pty/-/node-pty-0.9.0.tgz#8f9bcc0d1c5b970a3184ffd533d862c7eb6590a6"
-  integrity sha512-MBnCQl83FTYOu7B4xWw10AW77AAh7ThCE1VXEv+JeWj8mSpGo+0bwgsV+b23ljBFwEM9OmsOv3kM27iUPPm84g==
-  dependencies:
-    nan "^2.14.0"
-
 node-releases@^1.1.71:
   version "1.1.73"
   resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-1.1.73.tgz#dd4e81ddd5277ff846b80b52bb40c49edf7a7b20"