Re: behaviour change in getDirectoryContents in GHC 7.2?

On Thu, Nov 03, 2011 at 09:41:32AM +0000, Max Bolingbroke wrote:

On 2 November 2011 21:46, Ganesh Sittampalam wrote:

...

The workaround you propose seems a little complex and it might be a bit problematic that 100% roundtripping can't be guaranteed even once your fix is applied.

I can understand this perspective, although the roundtripping as implemented will only fail in certain very obscure cases.

Depending on the software one is writing, any failure, no matter how obscure, would not be acceptable. Think of a file browser, or backup software. So, yes, a non-destructive way of reading directories is important. At least one Linux distribution (I think Gentoo) actually has invalid pathnames in the filesystem in order to make sure that software that is part of the system will be able to handle them. For 'harchive' (which I am still gradually working on), I had to write my own version of readDirStream out of Posix that returns both the path and the inode number (FileID). Most filesystems on Linux are vastly faster if you 'stat' the entires of a directory in inode order rather than the order they were returned by readdir. In this sense, I'm not all that concerned if the regular getDirectoryContents isn't round trippable. David