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Re: [PATCH 06/19] git_remote_helpers: push all refs during a non-local export

From
Jonathan Nieder <jrnieder@gmail.com>
Date
Jun 9, 2011, 08:09 UTC
Message-ID
<20110609080912.GB4885@elie>
In-Reply-To
<20110608221908.GB15530@sigill.intra.peff.net>
Jeff King wrote:
Show 8 quoted lines
> If we do a fix that allows "refs/heads/foo:refs/heads/bar", then it
> should also properly allow "+refs/heads/foo:refs/heads/bar".  Which I
> think means changing the single "export" command in the ref-helper to
> something like:
>
>   export refs/heads/foo
>   export refs/heads/foo:refs/heads/bar
>   export +refs/heads/force

Thanks for explaining. The spirit of what you're saying seems right, so I'd like to spell it out a little to make sure.

If we imagine that the remote helper author wants to write as little code as possible (which seems reasonable), then probably their "export" command will simply feed its input to a vcs-fast-import program. git fast-export doesn't know how to do ref mapping and neither would vcs-fast-import. So one is led to wonder which stage in the pipeline can make the adaptations to make "git push hgrepo HEAD:refs/heads/bar" work.

To be friendly to remote helper authors, it would be nice to take care of the ref mapping somewhere on the transport-helper side, unless fast-import learns a new mode that does not label its result with refs. In the latter case, the "export" command could look like[*]

	export :1 refs/heads/foo
	export :2 refs/heads/bar
	export :3 +refs/heads/force
with :1, :2, and :3 being marks in the fast-import stream.

In the former case, the transport-helper could arrange for a stream that sets up refs/heads/foo, refs/heads/bar, and refs/heads/force to be written to stdout, but there would need to be a way to mention in the stream that the update to refs/heads/force is allowed to be non fast-forward. fast-import has a --force option for that, which unfortunately can't be controlled ref by ref.

Which is all a long way to say, I think you're right and that something like the syntax marked with [*] would be nice.

Previous: Sverre RabbelierNext: Sverre Rabbelier
Message 24 of 54 in “remote-helper improvements”
  1. 00/19 remote-helper improvementsSverre Rabbelier, Jun 8, 2011
  2. 01/19 transport-helper: fix minor leak in push_refs_with_exportSverre Rabbelier, Jun 8, 2011
  3. Jeff KingJun 8, 2011
  4. Sverre RabbelierJun 8, 2011
  5. 02/19 t5800: factor out some ref testsSverre Rabbelier, Jun 8, 2011
  6. 03/19 t5800: document some non-functional parts of remote helpersSverre Rabbelier, Jun 8, 2011
  7. Jonathan NiederJun 8, 2011
  8. Jonathan NiederJun 8, 2011
  9. Sverre RabbelierJun 8, 2011
  10. Sverre RabbelierJun 8, 2011
  11. Sverre RabbelierJun 9, 2011
  12. Jeff KingJun 10, 2011
  13. 04/19 teach remote-testgit to import non-HEAD refsSverre Rabbelier, Jun 8, 2011
  14. Jonathan NiederJun 8, 2011
  15. Sverre RabbelierJun 8, 2011
  16. Jeff KingJun 8, 2011
  17. Junio C HamanoJun 8, 2011
  18. Sverre RabbelierJun 9, 2011
  19. 05/19 transport-helper: don't feed bogus refs to export pushSverre Rabbelier, Jun 8, 2011
  20. 06/19 git_remote_helpers: push all refs during a non-local exportSverre Rabbelier, Jun 8, 2011
  21. Jonathan NiederJun 8, 2011
  22. Jeff KingJun 8, 2011
  23. Sverre RabbelierJun 8, 2011
  24. Jonathan NiederJun 9, 2011
  25. Sverre RabbelierJun 9, 2011
  26. Jonathan NiederJun 9, 2011
  27. Sverre RabbelierJun 9, 2011
  28. Jeff KingJun 10, 2011
  29. 07/19 remote-curl: accept empty line as terminatorSverre Rabbelier, Jun 8, 2011
  30. 08/19 git-remote-testgit: only push for non-local repositoriesSverre Rabbelier, Jun 8, 2011
  31. 09/19 git-remote-testgit: fix error handlingSverre Rabbelier, Jun 8, 2011
  32. 10/19 fast-import: introduce 'done' commandSverre Rabbelier, Jun 8, 2011
  33. Jonathan NiederJun 8, 2011
  34. Sverre RabbelierJun 8, 2011
  35. 11/19 fast-export: support done featureSverre Rabbelier, Jun 8, 2011
  36. 12/19 transport-helper: factor out push_update_refs_statusSverre Rabbelier, Jun 8, 2011
  37. 13/19 transport-helper: check status code of finish_commandSverre Rabbelier, Jun 8, 2011
  38. 14/19 transport-helper: use the new done feature where possibleSverre Rabbelier, Jun 8, 2011
  39. 15/19 transport-helper: update ref status after push with exportSverre Rabbelier, Jun 8, 2011
  40. Jonathan NiederJun 9, 2011
  41. Sverre RabbelierJun 9, 2011
  42. 16/19 transport-helper: change import semanticsSverre Rabbelier, Jun 8, 2011
  43. Jonathan NiederJun 8, 2011
  44. Sverre RabbelierJun 8, 2011
  45. 17/19 transport-helper: export is no longer always the last commandSverre Rabbelier, Jun 8, 2011
  46. Junio C HamanoJun 9, 2011
  47. Sverre RabbelierJun 9, 2011
  48. Jonathan NiederJun 9, 2011
  49. Sverre RabbelierJun 9, 2011
  50. Junio C HamanoJun 13, 2011
  51. 18/19 transport-helper: Use capname for gitdir capability tooSverre Rabbelier, Jun 8, 2011
  52. Jonathan NiederJun 8, 2011
  53. Sverre RabbelierJun 8, 2011
  54. 19/19 transport-helper: implement marks location as capabilitySverre Rabbelier, Jun 8, 2011

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