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Re: [PATCH 1/4] packed-backend: skip checking consistency of empty packed-refs file

From
shejialuo <shejialuo@gmail.com>
Date
May 7, 2025, 12:10 UTC
Message-ID
<aBtNtHni7uT70_Nu@ArchLinux>
In-Reply-To
<xmqqzffpima4.fsf@gitster.g>
On Tue, May 06, 2025 at 12:14:59PM -0700, Junio C Hamano wrote:
Show 11 quoted lines
> shejialuo <shejialuo@gmail.com> writes:
> 
> > In "load_contents", when the "packed-refs" is empty, we will just return
> > the snapshot. However, we would report an error to the user when
> > checking the consistency of the empty "packed-refs".
> 
> Neither the commit title nor the above paragraph hints that this is
> talking about "fsck" part of the packed-refs subsystem.  That leaves
> the readers confused when they read "with the runtime behavior"
> below.
> 
That's right. My message is vague.
Show 20 quoted lines
> > We should align with the runtime behavior. As what "load_contents" does,
> > let's check whether the file size is zero and if so, we will skip
> > checking the consistency and simply return.
> 
> How about
> 
> 	During fsck, an empty "packed-refs" file gives an error;
> 	this is unwarranted.  We should instead just return an empty
> 	"snapshot" and let the caller happily declare success, just
> 	like the code paths that implement the runtime use of the
> 	file do.
> 
> or something?
> 
> As to the title
> 
> 	packed-backend: fsck should allow an empty packed-refs file
> 
> is shorter and clearer, I would think.
> 
Thanks, I will improve this in the next version.
> The code change is trivially correct, I think.  Nicely found.
Previous: Junio C HamanoNext: shejialuo
Message 6 of 67 in “align the behavior when opening "packed-refs"”
  1. 0/4 align the behavior when opening "packed-refs"shejialuo, May 6, 2025
  2. 1/4 packed-backend: skip checking consistency of empty packed-refs fileshejialuo, May 6, 2025
  3. Junio C HamanoMay 6, 2025
  4. shejialuoMay 7, 2025
  5. Junio C HamanoMay 6, 2025
  6. shejialuoMay 7, 2025
  7. 2/4 packed-backend: extract snapshot allocation in `load_contents`shejialuo, May 6, 2025
  8. Junio C HamanoMay 6, 2025
  9. 3/4 packed-backend: extract munmap operation for `MMAP_TEMPORARY`shejialuo, May 6, 2025
  10. Junio C HamanoMay 6, 2025
  11. Junio C HamanoMay 6, 2025
  12. shejialuoMay 7, 2025
  13. 4/4 packed-backend: use mmap when opening large "packed-refs" fileshejialuo, May 6, 2025
  14. Junio C HamanoMay 6, 2025
  15. Junio C HamanoMay 6, 2025
  16. shejialuoMay 7, 2025
  17. 0/4 align the behavior when opening "packed-refs"shejialuo, May 7, 2025
  18. 1/4 packed-backend: fsck should allow an empty "packed-refs" fileshejialuo, May 7, 2025
  19. 2/4 packed-backend: extract snapshot allocation in `load_contents`shejialuo, May 7, 2025
  20. 3/4 packed-backend: extract munmap operation for `MMAP_TEMPORARY`shejialuo, May 7, 2025
  21. Jeff KingMay 8, 2025
  22. Junio C HamanoMay 8, 2025
  23. shejialuoMay 9, 2025
  24. 4/4 packed-backend: mmap large "packed-refs" file during fsckshejialuo, May 7, 2025
  25. Jeff KingMay 8, 2025
  26. shejialuoMay 9, 2025
  27. Jeff KingMay 9, 2025
  28. shejialuoMay 9, 2025
  29. Junio C HamanoMay 7, 2025
  30. Jeff KingMay 8, 2025
  31. Junio C HamanoMay 8, 2025
  32. Jeff KingMay 8, 2025
  33. shejialuoMay 9, 2025
  34. 0/3 align the behavior when opening "packed-refs"shejialuo, May 11, 2025
  35. 1/3 packed-backend: fsck should allow an empty "packed-refs" fileshejialuo, May 11, 2025
  36. Patrick SteinhardtMay 12, 2025
  37. shejialuoMay 12, 2025
  38. Patrick SteinhardtMay 12, 2025
  39. Jeff KingMay 12, 2025
  40. Junio C HamanoMay 12, 2025
  41. Patrick SteinhardtMay 13, 2025
  42. shejialuoMay 13, 2025
  43. 2/3 packed-backend: extract snapshot allocation in `load_contents`shejialuo, May 11, 2025
  44. Patrick SteinhardtMay 12, 2025
  45. shejialuoMay 12, 2025
  46. Patrick SteinhardtMay 12, 2025
  47. Jeff KingMay 12, 2025
  48. shejialuoMay 13, 2025
  49. 3/3 packed-backend: mmap large "packed-refs" file during fsckshejialuo, May 11, 2025
  50. Jeff KingMay 12, 2025
  51. 0/3 align the behavior when opening "packed-refs"shejialuo, May 13, 2025
  52. 1/3 packed-backend: fsck should warn when "packed-refs" file is emptyshejialuo, May 13, 2025
  53. Junio C HamanoMay 13, 2025
  54. shejialuoMay 14, 2025
  55. 3/3 packed-backend: mmap large "packed-refs" file during fsckshejialuo, May 13, 2025
  56. Junio C HamanoMay 13, 2025
  57. shejialuoMay 14, 2025
  58. 2/3 packed-backend: extract snapshot allocation in `load_contents`shejialuo, May 13, 2025
  59. 0/3 align the behavior when opening "packed-refs"shejialuo, May 14, 2025
  60. 2/3 packed-backend: extract snapshot allocation in `load_contents`shejialuo, May 14, 2025
  61. 1/3 packed-backend: fsck should warn when "packed-refs" file is emptyshejialuo, May 14, 2025
  62. 3/3 packed-backend: mmap large "packed-refs" file during fsckshejialuo, May 14, 2025
  63. Junio C HamanoMay 15, 2025
  64. Junio C HamanoMay 21, 2025
  65. Jeff KingMay 22, 2025
  66. Patrick SteinhardtMay 23, 2025
  67. Junio C HamanoMay 23, 2025

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