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

[Christian Heimes]

Am 21.06.2012 13:10, schrieb Armin Ronacher:
Hello Armin,

> No, but that's a good point.  It should attempt to resolve these in a loop
> until it either loops too often (would have to check the POSIX spec for a
> reasonable value) or until it terminates by finding an actual file or
> directory.

The specs mention sysconf(SYMLOOP_MAX) / _POSIX_SYMLOOP_MAX for the
maximum count of lookups. The limit is lower than I expected. On my
system it's defined as 8 in
/usr/include/x86_64-linux-gnu/bits/posix1_lim.h. The limit would also
handle self referencing loops correctly.

BTW Is there a better way than raise OSError(errno.ELOOP,
os.strerror(errno.ELOOP), filename) to raise a correct OSError with
errno, errno message and filename? A classmethod like
"OSError.from_errno(errno, filename=None) -> proper subclass auf OSError
with sterror() set" would reduce the burden for developers. PEP mentions
the a similar idea at
http://www.python.org/dev/peps/pep-3151/#implementation but this was
never implemented.

Christian