Allow passing XVFB parameters via env variable

[bahmutov]

Similar to #804 (same pull request should close both this and #804)

In the line below we explicitly initialize Xvfb screen. We should allow overwriting these values with user values from an environment variable, for example

XVFB_ARGS=-screen 0 1280x1024x24

cypress/cli/lib/exec/xvfb.js

Line 14 in c29f383

xvfb_args: ['-screen', '0', '1280x1024x24'],

The XVFB_ARGS would be parsed from a single string into an array of strings using spaces as separators and passed into Xvfb object. Might be a good idea to print parsed values to STDOUT to let the user know that non-default values are used.

[rsudarson]

Any update on this. In my usecase I've a restriction to use the Xvfb display between 1 to 10.

Unhandled rejection Error: Xvfb exited with a non zero exit code.
There was a problem spawning Xvfb.
This is likely a problem with your system, permissions, or installation of Xvfb.
----------
Error: ERROR: Please use display number in the range of 1-10.

Is there a way to restrict the display number to use from a particular range?

[observant2]

Don't know if this helps, but I wrote a Dockerfile using cypress/included and there I've overriden its entrypoint with a shellscript doing xvfb-run -a cypress run, where I pass my parameters to.
I'm not sure if that breaks something, but at least this allows us to run multiple cypress runners in the same host network without colliding xvfb instances. Maybe you can use this to pass your parameters to xvfb-run.

[rsudarson]

Any update on this?

[mkonev-casafari]

Any update on this?