From: Linus Torvalds <torvalds@osdl.org>
Date: Tue, 27 Sep 2005 18:04:17 GMT
Subject: Re: Cogito: cg-clone doesn't like packed tag objects
Message-ID: <Pine.LNX.4.58.0509271058110.3308@g5.osdl.org>
In-Reply-To: <20050927173445.GC23034@mythryan2.michonline.com>



On Tue, 27 Sep 2005, Ryan Anderson wrote:
> 
> $ cat .git/refs/tags/v2.6.13-rc4
> 7eab951de91d95875ba34ec4c599f37e1208db93
> $ git-rev-parse v2.6.13-rc4
> 7eab951de91d95875ba34ec4c599f37e1208db93
> $ git-rev-parse v2.6.13-rc4^0
> 63953523341bcafe5928bf6e99bffd7db94b471e
> $ git-rev-parse 63953523341bcafe5928bf6e99bffd7db94b471e^0
> 63953523341bcafe5928bf6e99bffd7db94b471e

The point being that if you want to test whether you have the thing the 
tag _points_ to, you should verify it.

And that's where the "--verify" flag comes in:

	[torvalds@g5 linux]$ git-rev-parse v2.6.11^0 ; echo $?
	error: Object 5dc01c595e6c6ec9ccda4f6f69c131c0dd945f8c is a tree, not a commit
	v2.6.11^0
	0

and if the object the tag points to didn't exist at _all_ in your object
store, you'd have silently gotten

	[torvalds@g5 linux]$ git-rev-parse v2.6.11^0 ; echo $?
        v2.6.11^0
        0

but if you used "--verify", you'd have at least gotten

	[torvalds@g5 linux]$ git-rev-parse --verify v2.6.11^0 ; echo $?
	fatal: Needed a single revision
	1

which is what you want, I thought.

		Linus