I'm building an Electron application (Node.js) which needs to spawn gcloud app deploy
from the application with realtime feedback (stdin/stdout/stderr).
I rapidly switched from child_process
to execa because I had some issues on Mac OS X with the child_process buffer which is limited to 200kb (and gcloud app deploy
sends some big chunk of string > 200kb which crash the command).
Now, with execa
everything seems to work normally on OSX but not on Windows.
The code looks something like this:
let bin = `gcloud${/^win/.test(process.platform) ? '.cmd' : ''}`
//which: https://github.com/npm/node-which
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 => {
...
})
})
This code works perfectly on Mac OS X while I haven't the same result on Windows
I have tried lots of thing:
I have made a GIST to show the responses I get for some tests I have done on Windows with basic Child Process scripts: https://gist.github.com/thyb/9b53b65c25cd964bbe962d8a9754e31f
I also opened an issue on execa
repository: https://github.com/sindresorhus/execa/issues/97
Does someone already got this issue ? I've searched around and found nothing promising except this reddit thread which doesn't solve this issue.
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: https://github.com/nodejs/node-v0.x-archive/issues/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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