Troubles with ch-15 \ lab 1

hey @kellv can you make sure to modify child.js so line two is exactly:

return console.log(process.env)

and then run the command

I want to exit early (return) and log out the env

Hey, got the same thing. Works on mac , not on windows. Error received: "child process should only have one env var".

Hello @davidmarkclements,

I'm struggling to get it on Windows too, BTW I edited child.js

'use strict'
const assert = require('assert')
const clean = (env) => Object.fromEntries(
  Object.entries(env).filter(([k]) => !/^(_.*|pwd|shlvl)/i.test(k))
)
const env = clean(process.env)

console.log(env)

assert.strictEqual(env.MY_ENV_VAR, 'is set')
assert.strictEqual(
  Object.keys(env).length,
  1,
  'child process should have only one env var'
)
console.log('passed!')

Adding the console.log(env) tried running it via the command

MINGW64 ~/Desktop/applications/certification/labs/ch-15/labs-1
$ node -e "child_process.spawn(process.execPath, ['child.js'], {stdio: 'inherit', env: { MY_ENV_VAR: 'is set' }})"
{
  HOMEDRIVE: 'C:',
  HOMEPATH: '\\Users\\elaconico',
  LOGONSERVER: '...',
  MY_ENV_VAR: 'is set',
  PATH: 'C:\\Program Files\\Git\\mingw64\\bin;C:\\Program Files\\Git\\usr\\bin;C:\\Users\\elaconico\\bin;C:\\Program Files (x86)\\Common Files\\Oracle\\Java\\javapath;C:\\Python27\\;C:\\Python27\\Scripts;C:\\ProgramData\\DockerDesktop\\version-bin;C:\\Program Files\\Docker\\Docker\\Resources\\bin;C:\\WINDOWS\\system32;C:\\WINDOWS;C:\\WINDOWS\\System32\\Wbem;C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0\\;C:\\Program Files\\Microsoft VS Code\\bin;C:\\Program Files\\PuTTY\\;C:\\xampp\\php;C:\\composer;C:\\Program Files\\TortoiseSVN\\bin;C:\\Program Files\\Redis\\;C:\\Users\\elaconico\\AppData\\Roaming\\nvm;C:\\nodejs;C:\\Program Files (x86)\\GnuWin32\\bin;C:\\Program Files\\Git\\cmd;C:\\Program Files\\heroku\\bin;C:\\Ruby26-x64\\bin;C:\\Users\\elaconico\\AppData\\Local\\Microsoft\\WindowsApps;C:\\Program Files\\OpenVPN\\bin;C:\\Users\\elaconico\\AppData\\Roaming\\Composer\\vendor\\bin;C:\\Program Files\\MongoDB\\Server\\4.2\\bin;C:\\ffmpeg\\bin;C:\\Program Files\\WhoLockMe',
  SYSTEMDRIVE: 'C:',
  SYSTEMROOT: 'C:\\WINDOWS',
  TEMP: 'C:\\Users\\ELACON~1\\AppData\\Local\\Temp',
  USERDOMAIN: '...',
  USERNAME: 'elaconico',
  USERPROFILE: 'C:\\Users\\elaconico',
  WINDIR: 'C:\\WINDOWS'
}
assert.js:118
  throw new AssertionError(obj);
  ^

AssertionError [ERR_ASSERTION]: child process should have only one env var
    at Object.<anonymous> (C:\Users\elaconico\Desktop\applications\certification\labs\ch-15\labs-1\child.js:11:8)
    at Module._compile (internal/modules/cjs/loader.js:1085:14)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
    at Module.load (internal/modules/cjs/loader.js:950:32)
    at Function.Module._load (internal/modules/cjs/loader.js:790:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:76:12)
    at internal/main/run_main_module.js:17:47 {
  generatedMessage: false,
  code: 'ERR_ASSERTION',
  actual: 12,
  expected: 1,
  operator: 'strictEqual'
}

blurred some of the value with ...
and yes, it seems it is injecting unwanted env vars, should we modify this then? Object.entries(env).filter(([k]) => !/^(_.*|pwd|shlvl)/i.test(k))

Thank you for your support!

I had the same issue, switched to Ubuntu WSL to pass

I almost managed to ovewrite the environment variables but on the assertion i get another one variable, apart from the one that we need.

I create an options object, where i add the env variable that we need:

excersice(myEnvVar){
    const exec_options = {
       cwd: null, 
       env: { MY_ENV_VAR: myEnvVar },
       encoding: 'utf8',
       timeout: 0,
       maxBuffer: 200 * 1024
    }

  const childprocess = spawn(process.execPath, ['-p', 'process.env'], exec_options)
  return childprocess
  }

But the output that i get on the node test has one more env variable. Can someone give me a clue why this __CF_USER_TEXT_ENCODING: is added on its own ?

I run all labs code based on Docker without issues and my host machine is Windows too.

Aha, really love to write code based on docker now. Thanks to WSL2 and VScode remote extensions.

Since child process inherits parent process.env by default, I just did process.env = { ... } before spawn().