[Rdiff-backup-bugs] [sr #106584] junctions need to be properly processed for useful backups

[Andrew Ferguson]

Follow-up Comment #1, sr #106584 (project rdiff-backup):

Examples from Vista:

c:Documents and Settings is a hidden junction to C:Users

In a user's home folder, there are many hidden junctions, such as:

"c:Users*My Documents" -> "c:Users*Documents"

and many others for roaming profiles.

Junction tool from Sysinternals:
http://technet.microsoft.com/en-us/sysinternals/bb896768.aspx

This KB article explains that NTFS junction points are *different* from DFS
junction points. (Argh!) http://support.microsoft.com/?kbid=205524


According to: http://msdn.microsoft.com/en-us/library/bb968829(VS.85).aspx,
"It is important that backup applications do not traverse these junction
points". We cannot rely on the names of junction points since they are
localized in the various versions of Windows.

To determine a junction point:

import win32file, winnt
win32file.GetFileAttributes(file) & winnt.FILE_ATTRIBUTE_REPARSE_POINT

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