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Re: [FEATURE REQUEST] Filter-branch extend progress with a simple estimated time remaning

From
Eric Sunshine <sunshine@sunshineco.com>
Date
Aug 30, 2015, 19:40 UTC
Message-ID
<CAPig+cTf2YLWGi2swmMxdx_XpEU=GkAx11ng6VVACMX9NpA_SQ@mail.gmail.com>
In-Reply-To
<xmqqd1y4zpjx.fsf@gitster.mtv.corp.google.com>
On Sun, Aug 30, 2015 at 12:52 PM, Junio C Hamano <gitster@pobox.com> wrote:
Show 23 quoted lines
>>> http://stackoverflow.com/questions/2445198/get-seconds-since-epoch-in-any-posix-compliant-shell
>>> Found this,
>>>
>>> awk 'BEGIN{srand();print srand()}'
>>>
>>> srand() in awk returns the previous seed value, and calling it without
>>> an argument sets it to time of day, so the above sequence should
>>> return seconds since the epoch, or at least something in seconds that
>>> is relative to a fixed point which is all that's needed in this
>>> thread.
>
> In practice this should work, but it makes me feel somewhat uneasy.
>
> POSIX says "Set the seed value for rand to expr or use the time of
> day if expr is omitted. The previous seed value shall be returned."
> but I do not see anything that says that "the time of day" is
> counted in seconds around there (which is the crucial bit for this
> application).
>
> http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html
> (4.15 Seconds since the Epoch) says "The relationship between the
> actual time of day and the current value for seconds since the Epoch
> is unspecified."

I suppose a viable approach might be to test once outside the loop if "date +%s" is supported and print the "(%d elapsed / %d estimated remaining)" annotation within the loop if it is, else not. The test might look something like this:

echo $(date +%s) | grep -q '^[0-9][0-9]*$' 2>/dev/null && show_eta=t

Platforms, such as Linux, Mac OS X, and FreeBSD, which support "date +%s" would get the annotated output, whereas it would fall back gracefully to the non-annotated output on platforms such as Solaris (and perhaps AIX) which lack it.

Previous: Eric SunshineNext: Eric Sunshine
Message 22 of 24 in “[FEATURE REQUEST] Filter-branch extend progress with a simple estimated time remaning”
  1. Gabor BernatAug 25, 2015
  2. Jeff KingAug 25, 2015
  3. Junio C HamanoAug 25, 2015
  4. Jeff KingAug 25, 2015
  5. Jeff KingAug 25, 2015
  6. Gabor BernatAug 25, 2015
  7. Eric SunshineAug 25, 2015
  8. Jeff KingAug 26, 2015
  9. Gabor BernatAug 29, 2015
  10. Gabor BernatAug 29, 2015
  11. Eric SunshineAug 30, 2015
  12. Gabor BernatAug 30, 2015
  13. Eric SunshineAug 30, 2015
  14. Mikael MagnussonAug 30, 2015
  15. Gabor BernatAug 30, 2015
  16. Mikael MagnussonAug 30, 2015
  17. Eric SunshineAug 30, 2015
  18. Junio C HamanoAug 30, 2015
  19. Gabor BernatAug 30, 2015
  20. Mikael MagnussonAug 30, 2015
  21. Eric SunshineAug 30, 2015
  22. Eric SunshineAug 30, 2015
  23. Eric SunshineAug 30, 2015
  24. Junio C HamanoAug 31, 2015

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