Re: [PATCH 4/3] t3700: avoid racy git situation

> Hi,
> 
> On Thu, 8 Nov 2007, Johannes Sixt wrote:
> 
> > Johannes Schindelin schrieb:
> > > Wow, the builtin commit is fast.  It sometimes triggers a racy
> > > situation in the test case for "git add --refresh -- foo".
> > > 
> > > So when that test fails, simply sleep one second and try again.
> > 
> > [/me looks at the calender - no, it's not April Fool's day]
> 
> No. The builtin commit is really that fast.
> 
> > Wouldn't it be better to fix git-commit (or git-add)? I would like to 
> > help, but you already seem to have done the analysis, so...
> 
> The problem is that the index has the same timestamp as the file "foo".
> 
> Therefore, git cannot tell if "foo" is up-to-date in the index, since it 
> could have been modified (and indeed is) just a fraction of a second later 
> than the index was last updated.
> 
> And since diff-index, as called from the test script, does not generate a 
> diff, but really only determines if the index information suggests that 
> the files are up-to-date, there is not really much you can do.
> 
> This is our good old friend, the racy git problem.
> 
> NOTE: other scms do not have this problem, mostly because they are too 
> slow to trigger it.