file permissions and copying files
lemming at henning-thielemann.de
Sun Feb 22 18:46:50 EST 2009
On Fri, 20 Feb 2009, Duncan Coutts wrote:
> I have complained before about the System.Directory file permissions
> API, and how it relates to copyFile.
> Let me give an example of where the existing copyFile API is too
> limited. Perhaps this will help us think about what an improved API
> might be.
> So for Unix the mapping is:
> setUserReadable True/False chmod u+r / u-r
> setUserWritable True/False chmod u+w / u-w
> setOtherReadable True/False chmod go+r / go-r
> setOtherWritable True/False chmod go+w / go-w
It's not hard to predict that 'Other' will be too coarse for some
applications, although I haven't an example. However, maybe we should have
a new package which provides common functions for Unix and Windows as
needed by Cabal. I expect that the 3 cases of permission transfer that you
described for Cabal will also occur in other applications. From this
package a general API for System.Directory may evolve.
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