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os.path.normpath over-normalizes #46542
Description
| BPO | 2289 |
|---|---|
| Nosy | @birkenfeld, @abalkin |
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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GitHub fields:
assignee = None
closed_at = <Date 2008-03-16.21:53:19.689>
created_at = <Date 2008-03-14.18:43:44.486>
labels = ['type-feature']
title = 'os.path.normpath over-normalizes'
updated_at = <Date 2008-03-16.21:53:19.687>
user = 'https://bugs.python.org/eljay451'bugs.python.org fields:
activity = <Date 2008-03-16.21:53:19.687>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = <Date 2008-03-16.21:53:19.689>
closer = 'georg.brandl'
components = []
creation = <Date 2008-03-14.18:43:44.486>
creator = 'eljay451'
dependencies = []
files = []
hgrepos = []
issue_num = 2289
keywords = []
message_count = 3.0
messages = ['63533', '63586', '63605']
nosy_count = 3.0
nosy_names = ['georg.brandl', 'belopolsky', 'eljay451']
pr_nums = []
priority = 'normal'
resolution = 'wont fix'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue2289'
versions = ['Python 2.4']
Activity
eljay451 commentedon Mar 14, 2008
I found a bug (or at least a shortcoming) in Python's os.path.normpath routine.
It overly normalizes, at least for Unix and Unix-like systems (including Mac), and
Windows.
Example:
If say "dog" is a symlink (any flavor of Unix (including OS X), or Win), there is a
difference between ./dog/../cupcake.txt and ./cupcake.txt.
In the OS, if dog is a symlink to fire/fly, the .. resolves relative to fire/fly.
It should be safe to normalize this:
././././././././cupcake.txt --> ./cupcake.txt
It should be safe to normalize this:
.////////////////cupcake.txt --> ./cupcake.txt
But this is not safe to normalize:
./x/../x/../x/../cupcake.txt --> ./cupcake.txt
For example, if the directories look like this:
./cupcake.txt
./over/yonder/back/cupcake.txt
./x --> over/there
./over/there
./over/x --> yonder/aways
./over/yonder/aways
./over/yonder/x --> back/again
./over/yonder/back/again
./cupcake.txt refers to first cupcake.
./x/../x/../x/../cupcake.txt refers to the second cupcake.
The os.path.realpath does the resolve, but sometimes the path-in-hand is for some
arbitrary path, and not necessarily one on the local system, or if on the local
files system may be relative based off from a different cwd.
abalkin commentedon Mar 16, 2008
This is a documented feature:
"""
normpath(path)
Normalize a pathname. ... It should be understood that this may change
the meaning of the path if it contains symbolic links!
"""
See http://docs.python.org/lib/module-os.path.html .
birkenfeld commentedon Mar 16, 2008
Closing as "Won't fix".