I have post an question at 
http://superuser.com/questions/962861/how-to-use-git-to-commit-read-only-file 


  I just want to know why GIT doesn't track read/write permission?


  What I want is just GIT keep what every I checked in? ( I am OK with the 
executable permission control)

It's sort of a philosophical issue. If you are placing a file into a 
repository, it is by definition "read only". You can never 'write' the same 
revision, but with a different content - it would be a contradiction. Hence the 
r/w flags are ignored.

It's important to remember that as concieved, Git is not a deployment tool, so 
it didn't need r/w permissions, and as open source DVCS, everything checked out 
would be local so the user would have full control, so read-only couldn't be 
relied on anyway, and we hope the user will contribute a change/improvement so 
'write' it is!

Likewise it doesn't store timestamps (of the files) either..

There is a Linus 'rant' somewhere on the issue..

Philip

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