Creating a 777 folder ended up with a 755 folder

[gwh-cpnet]

Operating System

• [x] Linux
• [ ] Windows 7
• [ ] Windows 10
• [ ] MacOS
• other:

NodeJS Version

• [ ] 0.x
• [ ] 4.x
• [ ] 6.x
• [ ] 7.x
• other: 12.16.1

Tmp Version

TBD: 0.1.0

Expected Behavior

TBD: Create a 777 folder

Experienced Behavior

TBD: Created a 755 folder

import fs from 'fs';
import tmp from 'tmp';
import assert from 'assert';
import tmpPromise from 'tmp-promise';

describe('tmp-promise', () => {
  it('should create a 0o777 tmp dir', async () => {
    const tmpDir = await tmpPromise.dir({ mode: 0o777 });
    const { mode } = await fs.promises.stat(tmpDir.path);
    assert.equal(mode & 0o777, 0o777); // eslint-disable-line no-bitwise
    tmpDir.cleanup();
  });
});

describe('tmp', () => {
  it('should create a 0o777 tmp dir', () => {
    const tmpDir = tmp.dirSync({ mode: 0o777 });
    const { mode } = fs.statSync(tmpDir.name);
    assert.equal(mode & 0o777, 0o777); // eslint-disable-line no-bitwise
    tmpDir.removeCallback();
  });
});

result:

1) tmp-promise
      AssertionError [ERR_ASSERTION]: 493 == 511

2) tmp
      AssertionError [ERR_ASSERTION]: 493 == 511

[gwh-cpnet]

okay, it turns out to be a node and linux issue.

https://github.com/nodejs/node/issues/15092#issuecomment-325994747