[Python-Dev] Add os.path.resolve to simplify the use of os.readlink

[Christian Heimes]

Am 21.06.2012 12:23, schrieb Armin Ronacher:
> Due to an user error on my part I was not using os.readlink correctly. 
> Since links can be relative to their location I think it would make sense
> to provide an os.path.resolve helper that automatically returns the
> absolute path:
> 
>     def resolve(filename):
>         try:
>             target = os.readlink(filename)
>         except OSError as e:
>             if e.errno == errno.EINVAL:
>                 return abspath(filename)
>             raise
>         return normpath(join(dirname(filename), target))
> 
> The above implementation also does not fail if an entity exists but is not
> a link and just returns the absolute path of the given filename in that
> case.

+1

Does the code handle a chain of absolute and relative symlinks
correctly, for example a relative symlink that points to another
relative symlink in a different directory that points to a file in a
third directry?

Christian