linux-kernel - Re: [ANNOUNCE] Git v1.8.3-rc0

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Message-ID: <517B62D8.5020006@alum.mit.edu>
Date:	Sat, 27 Apr 2013 07:32:08 +0200
From:	Michael Haggerty <mhagger@...m.mit.edu>
To:	shawn wilson <ag4ve.us@...il.com>
CC:	Junio C Hamano <gitster@...ox.com>, git@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [ANNOUNCE] Git v1.8.3-rc0

On 04/27/2013 04:24 AM, shawn wilson wrote:
> On Fri, Apr 26, 2013 at 8:22 PM, Junio C Hamano <gitster@...ox.com> wrote:
> 
>>  * There was no good way to ask "I have a random string that came from
>>    outside world. I want to turn it into a 40-hex object name while
>>    making sure such an object exists".  A new peeling suffix ^{object}
>>    can be used for that purpose, together with "rev-parse --verify".
>>
> 
> What does this mean / what is the reason behind this? I can only think
> it might be useful in a test suite to make sure git isn't doing
> anything stupid with hashes...?

The topic is discussed here:

http://git.661346.n2.nabble.com/Bug-in-quot-git-rev-parse-verify-quot-td7580929.html

As discussed in the thread, when verifying that an argument names an
existing object, it is usually also appropriate to verify that the named
object is of a particular type (or can be converted to a particular
type), which could already be done with syntax like
"$userstring^{commit}".  But if, for example, you want to avoid
unwrapping tags but also want to verify that the named object really
exists, "$userstring^{object}" now provides a way.

And what do you have against test suites? :-)

Michael

-- 
Michael Haggerty
mhagger@...m.mit.edu
http://softwareswirl.blogspot.com/
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