[issue40368] os.path.realpath uppercases Windows drive letter on Python 3.8

[Eryk Sun]

Eryk Sun  added the comment:

> `os.path.abspath(".")` returned 
> `'c:\\Users\\Kagami\\Documents\\GitHub\\gecko-dev'`. 
> Should `ntpath.normpaoh` make the drive letter uppercase?

ntpath.abspath and ntpath.normpath should preserve the input case for all 
components of a path because they don't query the system for the real path. On 
the other hand, ntpath.realpath in 3.8+ opens the path and queries the final 
path from the system. 

With drive-relative paths, ntpath.abspath does upper-case the drive letter. 
That's due to the underlying GutFullPathNameW call on Windows (an API function 
that normalizes a path as a string-only operation). We should just leave that 
up to Windows instead of trying to impose consistency. The behavior could be 
documented, however, along with other Windows behaviors such as per-drive 
working directories with drive-relative paths, DOS devices (e.g. 
"C:/Temp/con.txt" -> r"\\.\con") and stripping of trailing dots and spaces 
(e.g. "C:/Temp/spam. . ." -> r"C:\Temp\spam"). These cases make 
ntpath.abspath(path) more complicated than just the documented equivalent of 
ntpath.normpath(ntpath.join(os.getcwd(), path))` on "most platforms" (i.e. most 
POSIX platforms -- not Windows).

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[issue40368] os.path.realpath uppercases Windows drive letter on Python 3.8

[Kagami Sascha Rosylight]

Kagami Sascha Rosylight  added the comment:

Should `ntpath.normpath` make the drive letter uppercase?

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[issue40368] os.path.realpath uppercases Windows drive letter on Python 3.8

[Kagami Sascha Rosylight]

Kagami Sascha Rosylight  added the comment:

I mentioned `os.path.abspath` because `os.path.abspath(".")` on console 
returned `'c:\\Users\\Kagami\\Documents\\GitHub\\gecko-dev'`. It seems this 
incompatibility is partially because MSYS shell prefers lowercase letter for 
Windows path while Windows prefers otherwise.

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[issue40368] os.path.realpath uppercases Windows drive letter on Python 3.8

[Eryk Sun]

Eryk Sun  added the comment:

> This behavior is inconsistent with `os.path.abspath` where it always 
> returns lowercased drive letter, 

ntpath.abspath calls GetFullPathNameW, which generally preserves the input case 
of the device/drive component. But it doesn't always preserve drive-letter 
case. In particular, a drive-relative path gets resolved with the upper-case 
drive letter:

>>> os.path.abspath('c:spam')
'C:\\Temp\\spam'

That's a corner case that maybe needs to be addressed for ntpath.abspath. 
However, regarding ntpath.realpath, I see no reason for it to preserve the 
input case. To the contrary, it should always make a best effort to normalize 
the input path to use the real device and component names and replace 8.3 short 
names with long names.

> and also causes a failure in Gecko build script: 
> https://bugzilla.mozilla.org/show_bug.cgi?id=1628726

IMO, the bug there is using a case-insensitive path as a key without first case 
folding the string.

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nosy: +eryksun

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[issue40368] os.path.realpath uppercases Windows drive letter on Python 3.8

[Kagami Sascha Rosylight]

New submission from Kagami Sascha Rosylight :

```
$ python3.7
Python 3.7.4 (tags/v3.7.4:e09359112e, Jul  8 2019, 20:34:20) [MSC v.1916 64 bit 
(AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os;os.path.realpath('c:/')
'c:\\'
```

```
$ python3.8
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 23:03:10) [MSC v.1916 64 bit 
(AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os;os.path.realpath('c:/')
'C:\\'
```

This behavior is inconsistent with `os.path.abspath` where it always returns 
lowercased drive letter, and also causes a failure in Gecko build script: 
https://bugzilla.mozilla.org/show_bug.cgi?id=1628726

--
messages: 367053
nosy: saschanaz
priority: normal
severity: normal
status: open
title: os.path.realpath uppercases Windows drive letter on Python 3.8
type: behavior
versions: Python 3.8

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