better behavior when one of the pipeline commands crashes about gasket

[fgrehm]

Not sure if I should create a separate issue for what I am facing but we are looking into using gasket extensively at the company I'm working for and while doing some spikes I noticed some "weird behavior" during crashes which I don't know if it is the intended Gasket's behavior or not.

To give you some background, we are planning to use gasket from a Jenkins job and one of the things we noticed on initial testing is that Gasket does not return an exit code != 0 when a pipeline crashes.

The simplest example I can put together is:

$ cat gasket.json
{ "test": [ "curl waaaat.com", "cat" ] }

$ gasket run test; echo $?
0

I even tried using gasket as a module but I got the same behavior:

$ cat foo.js
var gasket    = require('gasket');
var pipelines = gasket({ example: [ "curl waaaat.com", "cat" ] });

pipelines.run('example').pipe(process.stdout);
console.log('Things did not break :(');

$ node foo.js
Things did not break :(

Why the exit code is important for us? The data generated by our pipeline will end up being pushed into rabbitmq so that other process can kick in and continue some additional processing. If we can't detect automatically that the gasket side of things had an issue from the Jenkins job we will never know if things are working as expected.

Hopefully that's clear enough. Please LMK if you need any additional information! :-)