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From: Junio C Hamano <junkio@cox.net>
Subject: Re: Seeing various mode changes on cygwin
Date: Mon, 10 Oct 2005 00:38:36 -0700
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To: Daniel Barkalow <barkalow@iabervon.org>
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Daniel Barkalow <barkalow@iabervon.org> writes:

> Perhaps have a bit in the index mode for the file to say that the mode in 
> the filesystem is unreliable, which gets set if a stat of the 
> newly-written file doesn't match the mode it was supposed to have, or if 
> git chmod is used to change it; then, if the bit is set, ignore the mode 
> in the filesystem and just use the mode in the index.

In effect, you are making the "per-repo configuration" Linus
mentioned a non configuration but a property recorded in the
index file.  I think this is a clever solution which is very
helpful to the end user.  I have to think about this a bit, but
my gut feeling tells me that it is the right direction if it
works.

I do not think you have to necessarily record it in the "index
mode" -- which implies this is per path -- nor even in the index
file itself.  We might even be able to get away with doing this
check at git-init-db time just once, and record it in a file,
say ".git/fs-mode-unreliable".