Merge pull request #14374 from robinro/fix-mount-without-permission-bug

add ismount function in module_utils

lib/ansible/module_utils/ismount.py

@@ -0,0 +1,90 @@
+# This code is part of Ansible, but is an independent component.
+# This particular file snippet, and this file snippet only, is based on
+# Lib/posixpath.py of cpython
+# It is licensed under the PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2
+#
+# 1. This LICENSE AGREEMENT is between the Python Software Foundation
+# ("PSF"), and the Individual or Organization ("Licensee") accessing and
+# otherwise using this software ("Python") in source or binary form and
+# its associated documentation.
+#
+# 2. Subject to the terms and conditions of this License Agreement, PSF hereby
+# grants Licensee a nonexclusive, royalty-free, world-wide license to reproduce,
+# analyze, test, perform and/or display publicly, prepare derivative works,
+# distribute, and otherwise use Python alone or in any derivative version,
+# provided, however, that PSF's License Agreement and PSF's notice of copyright,
+# i.e., "Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+# 2011, 2012, 2013, 2014, 2015 Python Software Foundation; All Rights Reserved"
+# are retained in Python alone or in any derivative version prepared by Licensee.
+#
+# 3. In the event Licensee prepares a derivative work that is based on
+# or incorporates Python or any part thereof, and wants to make
+# the derivative work available to others as provided herein, then
+# Licensee hereby agrees to include in any such work a brief summary of
+# the changes made to Python.
+#
+# 4. PSF is making Python available to Licensee on an "AS IS"
+# basis.  PSF MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR
+# IMPLIED.  BY WAY OF EXAMPLE, BUT NOT LIMITATION, PSF MAKES NO AND
+# DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS
+# FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON WILL NOT
+# INFRINGE ANY THIRD PARTY RIGHTS.
+#
+# 5. PSF SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON
+# FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS
+# A RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON,
+# OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.
+#
+# 6. This License Agreement will automatically terminate upon a material
+# breach of its terms and conditions.
+#
+# 7. Nothing in this License Agreement shall be deemed to create any
+# relationship of agency, partnership, or joint venture between PSF and
+# Licensee.  This License Agreement does not grant permission to use PSF
+# trademarks or trade name in a trademark sense to endorse or promote
+# products or services of Licensee, or any third party.
+#
+# 8. By copying, installing or otherwise using Python, Licensee
+# agrees to be bound by the terms and conditions of this License
+# Agreement.
+
+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.path.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