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From: Junio C Hamano <gitster@pobox.com>
Subject: Re: Ignore on commit
Date: Thu, 04 Oct 2012 19:44:40 -0700
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Cc: demerphq <demerphq@gmail.com>,
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To: Sitaram Chamarty <sitaramc@gmail.com>
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Sitaram Chamarty <sitaramc@gmail.com> writes:

>> Git ignore doesn't ignore tracked files.
>
> would 'git update-index --assume-unchanged' work in this case?  Didn't
> see it mentioned in any of the replies so far (but I have never used
> it myself)

The assume-unchanged bit is *not* an instruction to tell Git to
ignore changes.  It is your *promise* that you will not change it,
and tells Git that it is free to use the contents from the working
tree and the contents in the index interchangeably, taking whichever
is more convenient for Git to handle.

So, no, it might appear to work in some cases, but you are playing
with an undefined behaviour.