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Re: [RFC 0/3] Reflogs for deleted refs: fix breakage and suggest namespace change

From
Michael Haggerty <mhagger@alum.mit.edu>
Date
Aug 19, 2012, 13:19 UTC
Message-ID
<5030E7D6.8020206@alum.mit.edu>
In-Reply-To
<7vboi8rl2q.fsf@alter.siamese.dyndns.org>
On 08/18/2012 10:39 PM, Junio C Hamano wrote:
Show 10 quoted lines
> mhagger@alum.mit.edu writes:
> 
>> Given that a flag day would anyway be required to add a d/f-tolerant
>> system, I could live with a separate "graveyard" namespace as
>> originally proposed by Jeff.
>>
>> However, I still think that as long as we are making a jump, we could
>> try to land closer to the ultimate destination.
> 
> Do we _know_ already what the "ultimate destination" looks like?

No; we can only guess. I just wanted to submit some code so that the existence/absence of code would not prejudice the decision.

Show 8 quoted lines
> If the answer is yes, then I agree, but otherwise, I doubt it is a
> good idea to introduce unnecessary complexity to the system that may
> have to be ripped out and redone.
> 
> I didn't get the impression that we know the "ultimate destination"
> from the previous discussion, especially if we discount the tangent
> around "having next and next/foo at the same time" which was on
> nobody's wish, but I may be misremembering things.

It's been a wish of mine, but it's pretty low priority. I've also brainstormed about some other changes that could be connected with a new repo format:

* Allow "deleted" loose references (for example denoted by value 0{40})
that override packed references with the same name.  This would remove
the need to rewrite the packed-refs file when a reference is deleted.
(A prerequisite for this change would be to allow next and next/foo at
the same time.)
* Push HEAD and its friends down out of $GIT_DIR into a
reference-specific directory.
* Rename lock files to look less like reference names (e.g., something
like "refs/foo~lock" instead of "refs/foo.lock").
* Somehow munge reference names in a way to avoid other filesystem
limitations -- e.g., case insensitivity, filenames like "com" and "prn"
or with multiple dots under Windows.
* ...or maybe a packed-refs file that can (usually) be updated in-place,
and get rid of loose references entirely.
Michael
-- 
Michael Haggerty
mhagger@alum.mit.edu
http://softwareswirl.blogspot.com/
Previous: Alexey MuranovNext: Junio C Hamano
Message 18 of 21 in “[RFC 0/3] Reflogs for deleted refs: fix breakage and suggest namespace change”
  1. mhagger@alum.mit.eduAug 18, 2012
  2. 1/3 t9300: format test in modern style prior to modifying itmhagger@alum.mit.edu, Aug 18, 2012
  3. 2/3 Delete reflogs for dead references to allow pruningmhagger@alum.mit.edu, Aug 18, 2012
  4. Jeff KingAug 21, 2012
  5. 3/3 Change naming convention for the reflog graveyardmhagger@alum.mit.edu, Aug 18, 2012
  6. Junio C HamanoAug 18, 2012
  7. Alexey MuranovAug 18, 2012
  8. Junio C HamanoAug 19, 2012
  9. Alexey MuranovAug 19, 2012
  10. Alexey MuranovAug 19, 2012
  11. Alexey MuranovAug 19, 2012
  12. Junio C HamanoAug 19, 2012
  13. Alexey MuranovAug 19, 2012
  14. Junio C HamanoAug 20, 2012
  15. Junio C HamanoAug 20, 2012
  16. Alexey MuranovAug 20, 2012
  17. Alexey MuranovAug 20, 2012
  18. Michael HaggertyAug 19, 2012
  19. Junio C HamanoAug 19, 2012
  20. Jeff KingAug 21, 2012
  21. Junio C HamanoAug 21, 2012

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