[Python-Dev] pathlib handling of trailing slash (Issue #21039)

[Antoine Pitrou]

Le 06/08/2014 18:36, Isaac Schwabacher a écrit :
>>
>> If a symbolic link is encountered during pathname resolution, the
>> behavior shall depend on whether the pathname component is at the
>> end of the pathname and on the function being performed. If all of
>> the following are true, then pathname resolution is complete:
>>
>> 1. This is the last pathname component of the pathname. 2. The
>> pathname has no trailing <slash>. 3. The function is required to
>> act on the symbolic link itself, or certain arguments direct that
>> the function act on the symbolic link itself.
>>
>> In all other cases, the system shall prefix the remaining pathname,
>> if any, with the contents of the symbolic link. [...]

So the only case where this would make a difference is when calling a 
"function acting on the symbolic link itself" (such as lstat() or 
unlink()) on a path with a trailing slash:

 >>> os.lstat('foo')
os.stat_result(st_mode=41471, st_ino=1981954, st_dev=2050, st_nlink=1, 
st_uid=1000, st_gid=1000, st_size=4, st_atime=1407370025, 
st_mtime=1407370025, st_ctime=1407370025)
 >>> os.lstat('foo/')
os.stat_result(st_mode=17407, st_ino=917505, st_dev=2050, st_nlink=7, 
st_uid=0, st_gid=0, st_size=4096, st_atime=1407367916, 
st_mtime=1407369857, st_ctime=1407369857)

 >>> pathlib.Path('foo').lstat()
os.stat_result(st_mode=41471, st_ino=1981954, st_dev=2050, st_nlink=1, 
st_uid=1000, st_gid=1000, st_size=4, st_atime=1407370037, 
st_mtime=1407370025, st_ctime=1407370025)
 >>> pathlib.Path('foo/').lstat()
os.stat_result(st_mode=41471, st_ino=1981954, st_dev=2050, st_nlink=1, 
st_uid=1000, st_gid=1000, st_size=4, st_atime=1407370037, 
st_mtime=1407370025, st_ctime=1407370025)

But you can also call resolve() explicitly if you want to act on the 
link target rather than the link itself:

 >>> pathlib.Path('foo/').resolve().lstat()
os.stat_result(st_mode=17407, st_ino=917505, st_dev=2050, st_nlink=7, 
st_uid=0, st_gid=0, st_size=4096, st_atime=1407367916, 
st_mtime=1407369857, st_ctime=1407369857)

Am I overlooking other cases?

Regards

Antoine.