BackgroundTask_unique_profile.sys.mjs

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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*-

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

import { Subprocess } from "resource://gre/modules/Subprocess.sys.mjs";

export async function runBackgroundTask(commandLine) {

  let sentinel = commandLine.getArgument(0);

  let count =

    commandLine.length > 1

      ? Number.parseInt(commandLine.getArgument(1), 10)

      : 1;

  let main = await ChromeUtils.requestProcInfo();

  let info = [main.pid, Services.dirsvc.get("ProfD", Ci.nsIFile).path];

  // `dump` prints to the console without formatting.

  dump(`${count}: ${sentinel}${JSON.stringify(info)}${sentinel}\n`);

  // Maybe launch a child.

  if (count <= 1) {

    return 0;

  let command = Services.dirsvc.get("XREExeF", Ci.nsIFile).path;

  let args = [

    "--backgroundtask",

    "unique_profile",

    sentinel,

    (count - 1).toString(),

];

  // We must assemble all of the string fragments from stdout.

  let stdoutChunks = [];

  let proc = await Subprocess.call({

    command,

    arguments: args,

    stderr: "stdout",

    // Don't inherit this task's profile path.

    environmentAppend: true,

    environment: { XRE_PROFILE_PATH: null },

  }).then(p => {

    p.stdin.close();

    const dumpPipe = async pipe => {

      let data = await pipe.readString();

      while (data) {

        data = await pipe.readString();

        stdoutChunks.push(data);

};

    dumpPipe(p.stdout);

    return p;

});

  let { exitCode } = await proc.wait();

  let stdout = stdoutChunks.join("");

  for (let line of stdout.split(/\r\n|\r|\n/).slice(0, -1)) {

    dump(`${count}> ${line}\n`);

  return exitCode;