[Python-ideas] Adding shutil.disk_usage()

[Brian Curtin]

On Sat, Jun 11, 2011 at 13:51, Giampaolo Rodolà <g.rodola at gmail.com> wrote:

> Hi all,
> I've just implemented this functionality in psutil for both POSIX and
> Windows and thought it might be nice to have it in shutil module as
> well since it's useful when doing system monitoring:
> http://code.google.com/p/psutil/issues/detail?id=172
>
> The posix implementation is nothing but a wrapper around os.statvfs():
>
> def disk_usage(path):
>    """Return disk usage associated with path."""
>    st = os.statvfs(path)
>    free = (st.f_bavail * st.f_frsize)
>    total = (st.f_blocks * st.f_frsize)
>    used = (st.f_blocks - st.f_bfree) * st.f_frsize
>    percent = (float(used) / total) * 100
>    # NB: the percentage is -5% than what shown by df due to
>    # reserved blocks that we are currently not considering:
>    # http://goo.gl/sWGbH
>    return ntuple_diskinfo(total, used, free, round(percent, 1))
>
> ...and reflects what returned by "df /somepath".
> The Windows implementation requires GetDiskFreeSpaceEx() which is not
> exposed in python stdlib but can be added as a privade module
> (Modules/_winutil.c maybe?) or retrieved via ctypes.


The GetDiskFreeSpaceEx call should just be exposed within
Modules/posixmodule.c. See the posix__getfinalpathname function for an
example.
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