Re: [BUG] git submodule update is not fail safe

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Il 05/01/2013 15:01, Jens Lehmann ha scritto:

[...]

quoted

quoted

$ git submodule update --init
fatal: Needed a single revision
Unable to find current revision in submodule path 'pixman'

The problem is easy to solve: manually remove the pixman directory;
however IMHO git submodule update should not fail this way since it may
confuse the user.

Sounds like a reasonable observation.  Jens, Heiko, comments?

The reason seems to be that clone leaves a partial initialized .git
directory in case of connection problems. The next time submodule
update runs it tries to revive the submodule from .git/modules/<name>
but fails as there are no objects in it.

[...]

If this isn't seen as a bug in clone, we could also remove the
.git/modules/<name> directory in module_clone() of git-submodule.s
h when the clone fails. Manilo,

Its Manlio, not Manilo ;-).

does the following patch remove the
problems you are seeing (after removing .git/modules/pixman manually)?

I don't think I can test it right now, since the problem can only be
reproduced when git clone fails due to network problems.

Without the patch, if I remove the .git/modules/pixman directory,
`git submodule update --init pixamp` fails:

  Unable to find current revision in submodule path 'pixman'
  fatal: Not a git repository: pixman/../.git/modules/pixman


To reproduce the problem, however, it seems all you need to do is to
send SIGINT signal during `git submodule update` :

  $ git submodule update --init pixman
  Cloning into 'pixman'...
  remote: Counting objects: 10137, done.
  ^C

  $ git submodule update pixman
  remote: Counting objects: 10137, done.
  ^C

  $ git submodule update pixman
  fatal: Needed a single revision
  Unable to find current revision in submodule path 'pixman'


Note that I had to send SIGINT two times, in order to corrupt the module.

I suspect your patch does not fix this (since I don't get the "Clone
failed" error message).


I also noted that If I send SIGINT before git starts counting remote
objects, I get a different count number:


  $ git submodule update pixman
  Cloning into 'pixman'...
  ^C

  $ git submodule update pixman
  remote: Counting objects: 9757, done.
  ^C

  $ git submodule update pixman
  fatal: Needed a single revision
  Unable to find current revision in submodule path 'pixman'


Note that git is reporting 9757 remote objects, instead of 10137.


P.S.:
sorry for the mail I sent today.
It reported the exact same problem I reported yesterday: this morning I
was rather sure that I got a different error message from submodule
update...



Regards   Manlio
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