test_file_copyTo_permissions.js

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/* Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

add_task(async function test_copyTo_honors_umask() {

  const umask = Services.sysinfo.getProperty("umask");

  const base = do_get_tempdir();

  for (const perms of [0o755, 0o555]) {

    const src = base.clone();

    src.append(`src_${perms.toString(8)}`);

    const srcSub = src.clone();

    srcSub.append("subdir");

    srcSub.create(Ci.nsIFile.DIRECTORY_TYPE, 0o700);

    await IOUtils.writeUTF8(PathUtils.join(src.path, "file.txt"), "foo");

    await IOUtils.writeUTF8(PathUtils.join(srcSub.path, "file.txt"), "bar");

    srcSub.permissions = perms;

    src.permissions = perms;

    if (perms == 0o555) {

      const probe = src.clone();

      probe.append("probe");

      try {

        probe.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600);

        info("Read-only directories are writable when running as root");

        continue;

      } catch (e) {}

    const destName = `dest_${perms.toString(8)}`;

    src.copyTo(base, destName);

    const dest = base.clone();

    dest.append(destName);

    const destSub = dest.clone();

    destSub.append("subdir");

    Assert.equal(

      await IOUtils.readUTF8(PathUtils.join(dest.path, "file.txt")),

      "foo"

);

    Assert.equal(

      await IOUtils.readUTF8(PathUtils.join(destSub.path, "file.txt")),

      "bar"

);

    // The common 022 and 002 umasks leave 0o555 unchanged, so these checks only

    // catch a regression when running with a stricter umask such as 027.

    Assert.equal(dest.permissions, perms & ~umask);

    Assert.equal(destSub.permissions, perms & ~umask);

});