Solvedexeca Can't get stdout/stderr from a specific command (gcloud app deploy) on Windows.

Hello !

First, thanks a lot for your work on execa, it solves for me a big pain for some commands I wanted to spawn in my Electron application.

I have a strange issue trying to run gcloud app deploy with execa on Windows (it works perfectly on Mac OS X). I'm not sure if it's related to execa or directly Google Cloud Platform.
I can run all commands from gcloud with execa (gcloud -v, gcloud projects list etc...) but not gcloud app deploy (while it's working in cmd.exe). It sends me nothing - nothing on stdout - nothing on stderr - no promise resolved / rejected : Just nothing happens.

My current code looks something like this:

let bin = `gcloud${/^win/.test(process.platform) ? '.cmd' : ''}`
which(bin, (err, fullpath) => {
    let proc = execa(fullpath, ['app', 'deploy'], {
        cwd: appPath
    })
    proc.stdout.on('data', data => {
        parseDeploy(data.toString())
    })
    proc.stderr.on('data', data => {
        parseDeploy(data.toString())
    })
    proc.then(() => {
        ...
    }).catch(e => {
        ...
    })
})

I have tried lots of thing:

  • execa()
  • execa.shell()
  • options shell:true
  • I tried maxBuffer to 1GB (just in case as it was the reason why I chose execa with the 10Mo default cache as it was crashing with child_process.spawn() on Mac OS X)
  • It works with detached:true BUT I can't read stdout / stderr in realtime in the application

Does someone already got this issue ? I've searched around and found nothing promising.

4 Answers

✔️Accepted Answer

Wow, I finally found an easy solution ! (I'm so happy)

Behind the scene, gcloud.cmd is running a python script. After reading tons of Node.js issue with ChildProcess / Python and Windows, I fell on this thread: nodejs/node-v0.x-archive#8298

There is some known issue about running Python scripts from a Node.js Child Process.
They talk in this comment about an unbuffered option for python. After updating the shell script in gcloud.cmd by adding the -u option, I noticed everything was working as expected

This comment explains how to set this option as an environment variable (to not modify the windows shell script directly): https://docs.python.org/2/using/cmdline.html#envvar-PYTHONUNBUFFERED

So adding PYTHONUNBUFFERED to the environment variable fix this issue !

execa(fullpath, ['app', 'deploy'], {
  cwd: appPath,
  env: Object.assign({}, process.env, {
    PYTHONUNBUFFERED: true
  })
})

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