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From: Thomas Taylor <tayloth@gmail.com>
Subject: What would it take to get Cygwin and NTFS file permissions to play nice?
Message-ID: <5703de0b-e931-8120-ebdd-72da52c49879@gmail.com>
Date: Fri, 12 Aug 2016 22:26:19 -0400
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I use rsync to back up my Cygwin user directories to an external USB 
disk drive, formatted as NTFS.  This fails from time to time, usually 
due to permission failures when trying to update the destination files. 
The Windows permissions of the destination files turn out to be in the 
wrong order, and to contain extraneous entries.  Further checking of 
other files on the destination drive reveal the same problem with their 
Windows permissions.  Rather that try to correct the Windows permissions 
of each file in turn, I go as far up the directory tree as needed, and 
recursively reset all Windows file permissions all the way down.  When I 
then rsync the USB drive back to my user directories, the UNIX 
permissions of every file are now set to executable.  This has the 
unfortunate effect of granting execute permission on every file 
restored, even those that are not executable.  I gave up on correcting 
the permissions of the restored files (via a long-running recursive 
script), and learned to live with the problem.  Until now, that is.  I 
thought I'd try "ls --color", and was disappointed to find that almost 
everything (except directories and symbolic links) came out light green. 
  This happened because almost everything was marked as executable, and 
this happened because rsync mangled the Windows permissions, which are 
most easily reset to be the same on all files in a given directory and 
all subdirectories.  These Windows permissions inevitably involve "Full 
Control" (including execute permission) for somebody, especially the 
owner.  Yeah, I've read the Cygwin doc on this, and I get the feeling 
that solving it is too difficult/impossible/not worth the effort.  For 
starters, could we at least set the Windows permissions in proper order?


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