From mboxrd@z Thu Jan  1 00:00:00 1970
From: A Large Angry SCM <gitzilla@gmail.com>
Subject: Re: Git files data formats documentation
Date: Sat, 05 Aug 2006 14:56:42 -0700
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References: <44D42F0D.3040707@gmail.com> <7vac6jfzem.fsf@assigned-by-dhcp.cox.net>
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To: Junio C Hamano <junkio@cox.net>, git@vger.kernel.org
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Junio C Hamano wrote:
...
>> <OCTAL_MODE>
>> 	# Octal encoding, without prefix, of the file system object
>> 	# type and permission bits. The bit layout is according to the
>> 	# POSIX standard, with only regular files, directories, and
>> 	# symbolic links permitted. The actual permission bits are
>> 	# all zero except for regular files. The only permission bit
>> 	# of any consequence to Git is the owner executable bit. By
>> 	# default, the permission bits for files will be either 0644
>> 	# or 0755, depending on the owner executable bit.
>> 	;
> 
> It's not really "by default" -- more like "by definition", since
> there is no way for the program to use something different.  We
> used to record non-canonical modes in ancient versions of git,
> but I think fsck-objects would warn on objects created that way.
> 

See git-mktree.