Do you want to render ANSI in Zuul console?

Clark Boylan cboylan at
Thu Aug 27 21:01:01 UTC 2020

On Thu, Aug 27, 2020, at 1:56 PM, Sorin Sbarnea wrote:
> This does not make much sense to me as it sounds as: Lets convert all 
> the images to B&W because it takes less space on disk and tell user to 
> use JS based AI to recolor to them. 
> Displaying ANSI does not mean colorize my logs, has nothing to do with it.
> Displaying ANSI is about respecting the output produced by the executed tools.
> Zuul should respect the output received on stderr/stdout and display it 
> like a console/ terminal.  If the job author decides to use ANSI or not 
> is up to them. 

You asked if OpenStack would use/like to use such a feature. I'm suggesting a better option for OpenStack is to avoid adding a bunch of control codes to logs.

> Still, Zuul itself as product should just render ANSI content, mainly 
> because I do not see any use-case where someone would want to render 
> that text as RAW, as we all know ANSI escapes do not add any value to 
> the user.
> Still, if  the ability to display raw text, without ansi conversion is 
> a real need, I could spend few more hours to implement it and add a 
> preference option. Still,  think twice before asking for a feature that 
> adds some code complexity and may not prove to be of real practical 
> use. We all know that the raw text is still available inside the big 
> json file in case someone has doubs regarding what was rendered may be 
> wrong.
> > On 27 Aug 2020, at 17:24, Sean Mooney <smooney at> wrote:
> > 
> > On Thu, 2020-08-27 at 08:37 -0700, Clark Boylan wrote:
> >> On Thu, Aug 27, 2020, at 1:11 AM, Sorin Sbarnea wrote:
> >>> At this moment Zuul web interfaces displays output of commands as raw, 
> >>> so any ANSI terminal output will display ugly artifacts.
> >>> 
> >>> I tried enabling ANSI about half a year ago but even after providing 
> >>> two different implementations, I was not able to popularize it enough.
> >>> 
> >>> 
> >>> As this is a UX related feature, I think would like more appropriate to 
> >>> ask for feedback from openstack-discuss, likely the biggest consumer of 
> >>> zuul web interface. 
> >>> 
> >>> Please comment/+/- on review below even if you are not a zuul core. At 
> >>> least it should show if this is a desired feature to have or not:
> >> 
> >> Without my Zuul hat on but with my "I debug a lot of openstack jobs" hat I would prefer we remove ansi color controls
> >> from our log files entirely. They make using grep and other machine processing tools more difficult. I find the
> >> utility of grep, ^F, elasticsearch, and the log level severity filtering far more useful than scrolling and looking
> >> for colors that may be arbitrarily applied by the source.
> > if we can remove them form the logs but use a javascpit lib in the viewer to still highlight thing that might be the
> > best of both worlds
> > i do fine the syntax hyilighign nice but we dont need color codes to do that.
> >> 
> >>> 
> >>>> >>> 
> >>> This review also includes a screenshot that shows how the rendering 
> >>> looks (an alternative for using the sitepreview)
> >>> 
> >>> Thanks
> >>> Sorin Sbarnea

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