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Re: [RFC PATCH v3 8/8] --sparse for porcelains

From
Jakub Narebski <jnareb@gmail.com>
Date
Aug 18, 2009, 00:17 UTC
Message-ID
<200908180217.35963.jnareb@gmail.com>
In-Reply-To
<alpine.DEB.1.00.0908180111340.8306@pacific.mpi-cbg.de>
Johannes Schindelin wrote:
> The thing is: we need a way to determine quickly and without any 
> ambiguity whether a file is tracked, assumed unchanged, or sparse'd-out 
> (which Nguyễn calls no-checkout).

Let's reiterate: "assume-unchanged" is about telling git that it should assume for performance reasons that state of file in working directory is the same as state of file in the index. But, from what was said in this thread, there are situations where git for correctness reasons ignores performance hack.

"no-checkout" bit is about telling git that the file is not present in working directory, and it has to use version from the index. Then there is a question if there is file in working area (e.g. from applying patch) which corresponds to a "no-checkout" file in index (corresponds because of rename detection).

> And if we change .git/info/sparse, that state _must not_ change.  We did 
> not touch the file by editing .git/info/sparse, so the state must be 
> unchanged.

I think this situation (and the issue of correctness vs "assume-unchanged" mentioned above) hints that "no-checkout" and "assume-unchanged" should be separate bits, even if both tell git to use version from index.

There is e.g. question if "git grep" should search "no-checkout" files; in the "assume-unchanged" case it should, I think, search index version.

P.S. I wonder if it would be worth resurrecting series adding support for directories in index (which can help performance and 'empty directories' issue)... It would help, I think, with sparse checkout.

-- 
Jakub Narebski
Poland
Previous: Johannes SchindelinNext: skillzero@gmail.com
Message 32 of 53 in “Sparse checkout”
  1. 0/8 Sparse checkoutNguyễn Thái Ngọc Duy, Aug 11, 2009
  2. 1/8 Prevent diff machinery from examining assume-unchanged entries on worktreeNguyễn Thái Ngọc Duy, Aug 11, 2009
  3. 2/8 Avoid writing to buffer in add_excludes_from_file_1()Nguyễn Thái Ngọc Duy, Aug 11, 2009
  4. 3/8 Read .gitignore from index if it is assume-unchangedNguyễn Thái Ngọc Duy, Aug 11, 2009
  5. 4/8 excluded_1(): support exclude "directories" in indexNguyễn Thái Ngọc Duy, Aug 11, 2009
  6. 5/8 dir.c: export excluded_1() and add_excludes_from_file_1()Nguyễn Thái Ngọc Duy, Aug 11, 2009
  7. 6/8 unpack-trees.c: generalize verify_* functionsNguyễn Thái Ngọc Duy, Aug 11, 2009
  8. 7/8 Support sparse checkout in unpack_trees() and read-treeNguyễn Thái Ngọc Duy, Aug 11, 2009
  9. 8/8 --sparse for porcelainsNguyễn Thái Ngọc Duy, Aug 11, 2009
  10. Junio C HamanoAug 12, 2009
  11. Nguyen Thai Ngoc DuyAug 12, 2009
  12. Nguyen Thai Ngoc DuyAug 13, 2009
  13. Jakub NarebskiAug 13, 2009
  14. Nguyen Thai Ngoc DuyAug 13, 2009
  15. Jakub NarebskiAug 14, 2009
  16. Junio C HamanoAug 15, 2009
  17. Jakub NarebskiAug 15, 2009
  18. Johannes SchindelinAug 16, 2009
  19. Johannes SchindelinAug 17, 2009
  20. Nguyen Thai Ngoc DuyAug 17, 2009
  21. Johannes SchindelinAug 17, 2009
  22. Nguyen Thai Ngoc DuyAug 17, 2009
  23. Johannes SchindelinAug 17, 2009
  24. Nguyen Thai Ngoc DuyAug 17, 2009
  25. Junio C HamanoAug 17, 2009
  26. Nguyen Thai Ngoc DuyAug 17, 2009
  27. Johannes SchindelinAug 17, 2009
  28. Junio C HamanoAug 17, 2009
  29. Johannes SchindelinAug 17, 2009
  30. skillzero@gmail.comAug 17, 2009
  31. Johannes SchindelinAug 17, 2009
  32. Jakub NarebskiAug 18, 2009
  33. skillzero@gmail.comAug 18, 2009
  34. Nguyen Thai Ngoc DuyAug 18, 2009
  35. git find (was: [RFC PATCH v3 8/8] --sparse for porcelains)Jakub Narebski, Aug 18, 2009
  36. Nguyen Thai Ngoc DuyAug 18, 2009
  37. Jakub NarebskiAug 18, 2009
  38. Jakub NarebskiAug 18, 2009
  39. skillzero@gmail.comAug 18, 2009
  40. Junio C HamanoAug 17, 2009
  41. Johannes SchindelinAug 17, 2009
  42. Jakub NarebskiAug 17, 2009
  43. Johannes SixtAug 12, 2009
  44. Nguyen Thai Ngoc DuyAug 12, 2009
  45. Raja R HarinathAug 12, 2009
  46. Johannes SixtAug 13, 2009
  47. skillzero@gmail.comAug 11, 2009
  48. Jakub NarebskiAug 11, 2009
  49. skillzero@gmail.comAug 11, 2009
  50. Nguyen Thai Ngoc DuyAug 12, 2009
  51. skillzero@gmail.comAug 12, 2009
  52. Junio C HamanoAug 12, 2009
  53. Nguyen Thai Ngoc DuyAug 13, 2009

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