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Re: Bug: "git checkout -b" should be allowed in empty repo

From
Junio C Hamano <gitster@pobox.com>
Date
Feb 6, 2012, 05:30 UTC
Message-ID
<7vk440a5qw.fsf@alter.siamese.dyndns.org>
In-Reply-To
<20120206051834.GA5062@sigill.intra.peff.net>
Jeff King <peff@peff.net> writes:
Show 5 quoted lines
> Sure, that's one way to do it. But I don't see any point in not allowing
> "git checkout -b" to be another way of doing it. Is there some other use
> case for "git checkout -b" from an unborn branch? Or is there some
> harmful outcome that can come from doing so that we need to be
> protecting against? Am I missing something?
Mostly because it is wrong at the conceptual level to do so.
	git checkout -b foo
is a short-hand for
	git checkout -b foo HEAD
which is a short-hand for
	git branch foo HEAD &&
        git checkout foo

But the last one has no chance of working if you think about it, because "git branch foo $start" is a way to start a branch at $start and you need to have something to point at with refs/heads/foo.

So we are breaking the equivalence between these three only when HEAD points at an unborn branch.

Previous: Jeff KingNext: Junio C Hamano
Message 21 of 34 in “Bug: "git checkout -b" should be allowed in empty repo”
  1. Michael HaggertyJan 29, 2012
  2. Junio C HamanoJan 29, 2012
  3. Junio C HamanoJan 29, 2012
  4. Michael HaggertyJan 30, 2012
  5. Junio C HamanoJan 30, 2012
  6. Junio C HamanoJan 30, 2012
  7. Jeff KingJan 30, 2012
  8. Junio C HamanoFeb 6, 2012
  9. Junio C HamanoFeb 6, 2012
  10. Jeff KingFeb 6, 2012
  11. Andrew ArdillFeb 6, 2012
  12. Jeff KingFeb 6, 2012
  13. Michael HaggertyFeb 6, 2012
  14. Jeff KingFeb 6, 2012
  15. Junio C HamanoFeb 6, 2012
  16. Jeff KingFeb 6, 2012
  17. Michael HaggertyFeb 7, 2012
  18. demerphqFeb 6, 2012
  19. Junio C HamanoFeb 6, 2012
  20. Jeff KingFeb 6, 2012
  21. Junio C HamanoFeb 6, 2012
  22. Junio C HamanoFeb 6, 2012
  23. Jeff KingFeb 6, 2012
  24. Michael HaggertyFeb 6, 2012
  25. Junio C HamanoFeb 6, 2012
  26. Jeff KingJan 30, 2012
  27. branch --edit-description: protect against mistyped branch nameJunio C Hamano, Feb 6, 2012
  28. Junio C HamanoFeb 6, 2012
  29. Jeff KingFeb 6, 2012
  30. Michael HaggertyJan 31, 2012
  31. Johannes SixtJan 31, 2012
  32. demerphqJan 31, 2012
  33. Jakub NarebskiJan 31, 2012
  34. Michael HaggertyJan 31, 2012

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