[bug#45146] [PATCH] scripts: substitute: Improve fetch-narinfos progress reporting.

[Christopher Baines <mail@cbaines.net>]

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Christopher Baines <mail@cbaines.net> writes:

> Ludovic Courtès <ludo@gnu.org> writes:
>
>> Christopher Baines <mail@cbaines.net> skribis:
>>
>>> At least in guix weather, these changes make the progress bar actually appear.
>>>
>>> * guix/scripts/substitute.scm (fetch-narinfos): Use (guix progress) for
>>> progress reporting.
>>
>> Cool.  I noticed that something was wrong with ‘guix weather’, but I
>> suspected it had to do with the order in which the erase-line sequence
>> and \r are sent.
>>
>>> -      (lambda ()
>>> -        (display "\r\x1b[K" (current-error-port)) ;erase current line
>>> -        (force-output (current-error-port))
>>> -        (format (current-error-port)
>>> -                (G_ "updating substitutes from '~a'... ~5,1f%")
>>> -                url (* 100. (/ done total)))
>>> -        (set! done (+ 1 done)))))
>>> +  (define fetch-narinfos-progress-reporter
>>> +    (progress-reporter/bar (length paths)))
>>
>> The problem here is that we’d see a progress bar without knowing what it
>> represents.
>>
>> Besides, currently output from ‘guix substitute’ is printed as is by
>> client commands, regardless of whether stdout is a tty.  The problem
>> already exists but it would become a bit more visible as logs get filled
>> with progress bars.
>
> Maybe it's best to circle back to fixing guix weather after trying to
> restructure some of the guix substitute code.
>
> I've made an initial attempt at moving things around in [1]. If the
> underlying code can live in a module, and then the substitute, weather
> and challenge scripts use that code with whatever UI stuff they want,
> maybe that will allow for better addressing this weather specific issue.
>
> 1: https://issues.guix.info/45409

I've sent a couple of updated patches for this. They're not particularly
dependent on the above work to create the (guix substitutes) module, but
I based the commits on that.

These commits make more careful changes, the substitute script behaviour
should remain the same.

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