[Pharo-dev] #renameTo: and #moveTo:

Alistair Grant akgrant0710 at gmail.com
Thu Apr 20 03:53:47 EDT 2017


On Wed, Apr 19, 2017 at 09:57:41PM +0200, Nicolas Cellier wrote:
> 2017-04-19 21:41 GMT+02:00 Alistair Grant <akgrant0710 at gmail.com>:
> 
>     Hi All,
> 
>     While recently running the test suite I've been getting failures in
>     FileLocatorTest>>testMoveTo if the working directory when the test
>     is run is on a different unix file system to the user's home directory.
> 
>     The failing primitive is 'primitiveFileRename' in module 'FilePlugin',
>     which calls rename(), which is presumably part of libc - I didn't chase
>     it back through the C code.
> 
>     libc rename() requires the source and destination filenames to be on the
>     same file system.
> 
>     This has been discussed multiple times before:
> 
>     https://pharo.fogbugz.com/f/cases/13957/Add-exception-for-
>     cross-volume-folder-renames
>     https://pharo.fogbugz.com/f/cases/12992/Cannot-move-files-
>     to-another-volume-partition-under-linux
>     https://pharo.fogbugz.com/f/cases/12965/Cannot-moveTo-FileLocator
> 
>     Issue 12965 is even supposed to include a fix, although when I searched
>     through the slice I couldn't find anything that actually looked like a
>     fix.
> 
>     As Nicolai suggested in 12965, the obvious solution is to implement move
>     as copy+delete.  It looks like there isn't an easy way to check whether
>     the two files are on the same unix file system, so presumably it would
>     be implemented as try to rename, and if that fails, try to copy and
>     delete.
> 
> 
> What? Google this: man stat
> The first field of stat structure is a device ID, so deciding if two files are
> on same file system or not is doable by checking this field for the source file
> and destination file (if it exists) or directory - modulo the fact that you'd
> have to care of symbolic links with lstat.

I meant from within the image.  Also, while this is fine for Linux,
and probably for MacOS, what about Windows?

It would be great if this exists in the image.  Maybe it's time for me
to learn FFI.


>     Is there a reason not to propose this as a patch?

Cheers,
Alistair





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