Re: [PATCH 1/6] Remote helper: accept ':<value> <name>' as a response to 'list'

From: Jonathan Nieder <jrnieder@gmail.com>
Date: Oct 5, 2010, 02:00 UTC
Message-ID: <20101005020035.GA10818@burratino>
In-Reply-To: <1286108511-55876-1-git-send-email-tom@dbservice.com>

Hi,

Tomas Carnecky wrote:

>                                                          The ref is first stored
> as 'impure', meaning that it doesn't have any representation within git. Only
> after the remote helper fetches that version into git, it can tell us which
> git object (SHA1) that revision maps to.

Hmm.

The existing ls-remote output looks something like

	<object id>	HEAD
	<object id>	<refname>
	<object id>	<refname>
	...
	<object id>	<tag refname>
	<object id>	<tag refname>^{}
	...

In particular, each line has a 40-character object id, a tab character, and then something like a refname.

If we want to extend that, wouldn't we need to do something like

	0000...0000	<refname>
	0000...0000	<refname> is r11

to avoid breaking people's scripts? For example, I wouldn't be surprised if scripts are relying on the following two properties:

 - each object id is 40 characters (e.g., the old fetch--tool
   in contrib/examples relies on this)
 - each object id contains no whitespace

simply because they are convenient to script with.