On 10/23/07, Adam R. Maxwell <[EMAIL PROTECTED]> wrote:
>
>
> On Tuesday, October 23, 2007, at 11:15AM, "Christiaan Hofman" <
> [EMAIL PROTECTED]> wrote:
> >I am confused about aliases to files that do not exist. This may give
> >problems for persistency of the new file objects.
> >
> >If a file does not exist, it seems that the data from the alias
> >becomes invalid. That is, if you save this data, and later try to
> >reopen it when the file has been restored on the proper path, it
> >won't be able to find this new file.
> >
> >Any idea why this would happen, and how to avoid this problem?
>
> So the file existed when the alias was created, and was then removed, and
> the alias data was saved? If the alias was created with a relative path (or
> the absolute path didn't change), my understanding is that the original
> alias data would be valid. Trying to resolve the alias and update it
> between the time when the file was removed and the point at which it was
> saved could probably mess it up, though.
I think that is indeed the problem: when the alias is resolved, the alias is
updated by FSResolveAlias. The bad thing is that it apparently updates when
resolving the alias fails. I do think that is a bug.
I think we need to look into unit tests or something similar for this, and
> add test scenarios as we think of them. The problems are complex with
> relative paths, and the existing alias documentation isn't as helpful as it
> could be.
>
> --
> adam
The docs are certainly lacking. Moreover there can always be bugs. I may
have found a fix for this problem, by not using FSResolveAlias but rather
FSMatchAlias, and update the alias ourselves when we are sure things are OK.
And we sure should do some unit testing for different scenarios.
Sorry for all the bugs I introduced recently. But it's almost impossible to
switch between different versions of the same project on a single computer.
Christiaan
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