From: Avery Pennarun <apenwarr@gmail.com>
Date: Thu, 15 May 2008 20:12:10 GMT
Subject: Re: How can I tell if a SHA1 is a submodule reference?
Message-ID: <32541b130805151312p7a08a0b7id7c12bc8a04e2aca@mail.gmail.com>
In-Reply-To: <7F242E8F-13CF-4BE5-B3E6-85F285391658@ohloh.net>

On 5/15/08, Robin Luckey <robin@ohloh.net> wrote:
>  However, is there a simple and reliable way for me to know which SHA1
> hashes refer to such submodule objects? I'd like to simply ignore them.

I don't think there's a straightforward way to do this given *just*
the SHA1, in the same way that you can't know the path corresponding
to a blob given just its SHA1.

However, if you're looking at a tree that refers to a SHA1, the tree
will reference a submodule object as a "commit" instead of a "tree" or
"blob".  git-ls-tree output looks something like this:

160000 commit ba75ff608fabafeaafeb48d55b125440b5a665bc	my_subdir

I think it's reasonable to say that if it's type commit, then it's a
submodule.  (Note that simply being a submodule doesn't *necessarily*
imply that it'll be unavailable; some people like to store all the
submodule objects in the local repository.)

Have fun,

Avery