Message 260068 - Python tracker

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Author	eryksun
Recipients	Aaron.Meurer, Voo, eryksun, ezio.melotti, jens, loewis, pitrou, santoso.wijaya, serhiy.storchaka, steve.dower, vstinner, zach.ware
Date	2016-02-11.03:02:36
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1455159757.02.0.743086101475.issue18199@psf.upfronthosting.co.za>
In-reply-to

Content
> There is a problem with os.chdir(): It doesn't work with > \\?\ notation. The process current directory is part of the Windows API, so it's subject to the MAX_PATH limit [1]. See SetCurrentDirectory [2]. Python can't do anything about this. As to shutil.rmtree, I agree it's an example of why the Windows path-length problem needs to be addressed more generally. Maybe there could be a __path__ special method supported by pathlib paths. On Windows this could resolve to an absolute path prefixed with "\\?\". [1]: Native NT relative paths are relative to a handle in the OBJECT_ATTRIBUTES record that's used to create or open an object. This isn't generally exposed in the Windows API, except in the registry API. [2]: https://msdn.microsoft.com/en-us/library/aa365530

> There is a problem with os.chdir(): It doesn't work with
> \\?\ notation.

The process current directory is part of the Windows API, so it's subject to the MAX_PATH limit [1]. See SetCurrentDirectory [2]. Python can't do anything about this. 

As to shutil.rmtree, I agree it's an example of why the Windows path-length problem needs to be addressed more generally. Maybe there could be a __path__ special method supported by pathlib paths. On Windows this could resolve to an absolute path prefixed with "\\?\".

[1]: Native NT relative paths are relative to a handle in the 
     OBJECT_ATTRIBUTES record that's used to create or open an 
     object. This isn't generally exposed in the Windows API, 
     except in the registry API.
[2]: https://msdn.microsoft.com/en-us/library/aa365530

History
Date	User	Action	Args
2016-02-11 03:02:37	eryksun	set	recipients: + eryksun, loewis, pitrou, vstinner, ezio.melotti, Aaron.Meurer, santoso.wijaya, Voo, jens, zach.ware, serhiy.storchaka, steve.dower
2016-02-11 03:02:37	eryksun	set	messageid: <1455159757.02.0.743086101475.issue18199@psf.upfronthosting.co.za>
2016-02-11 03:02:36	eryksun	link	issue18199 messages
2016-02-11 03:02:36	eryksun	create