add ismount function from python Lib/posixpath.py

needed for https://github.com/ansible/ansible-modules-core/pull/2737
This commit is contained in:
Robin Roth 2016-02-08 18:58:36 +01:00
parent ccbc7d217b
commit c0ebb74ad0

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@ -0,0 +1,90 @@
# This code is part of Ansible, but is an independent component.
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# Lib/posixpath.py of cpython
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import os
def ismount(path):
"""Test whether a path is a mount point
clone of os.path.ismount (from cpython Lib/posixpath.py)
fixed to solve https://github.com/ansible/ansible-modules-core/issues/2186
and workaround non-fixed http://bugs.python.org/issue2466
this should be rewritten as soon as python issue 2466 is fixed
probably check for python version and use os.path.ismount if fixed
to remove replace in this file ismount( -> os.path.ismount( and remove this
function"""
try:
s1 = os.lstat(path)
except OSError:
# the OSError should be handled with more care
# it could be a "permission denied" but path is still a mount
return False
else:
# A symlink can never be a mount point
if os.stat.S_ISLNK(s1.st_mode):
return False
parent = os.path.join(path, os.path.pardir)
parent = os.path.realpath(parent)
try:
s2 = os.lstat(parent)
except OSError:
# one should handle the returned OSError with more care to figure
# out whether this is still a mount
return False
if s1.st_dev != s2.st_dev:
return True # path/.. on a different device as path
if s1.st_ino == s2.st_ino:
return True # path/.. is the same i-node as path, i.e. path=='/'
return False