[Haskell-cafe] Re: Darcs and NFS Resolution

[Brandon S. Allbery KF8NH]

On Sep 12, 2009, at 11:22 , Trent W. Buck wrote:
> Jason Dagit <dagit at codersbase.com> writes:
>>> which ensures that when the operating system is not WIN32, that
>>> renaming of files will be performed by the OS shell.
>
> I'm also puzzled as to why this works -- surely mv(1) assumes POSIX
> semantics, too?  I would be interested in seeing the exact error
> transcript, preferably as an issue on bugs.d.n.  I'm not sure the
> problem has been diagnosed correctly.

In order to handle the case where you're moving across filesystems,  
mv(1) gracefully degrades to cp + rm.  rename(2) does not.  This also  
happens to work around compatibility issues with native CIFS (and  
possibly older HP/UX, not that anyone likely cares).

>> Yes, and in the meantime we can implement something like this in
>> workaround.hs.
>
> I definitely think this SHOULD NOT be enabled by default, unless  
> you're
> going to ONLY enable it in the specific scenario of CIFS on Linux.


I definitely think you've made incorrect assumptions; the proposed  
workaround is reasonable even if not ideal.  (I would fall back to the  
mv(1) method only if rename(2) fails.)

-- 
brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university    KF8NH


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