Re: git-pull and tag objects

[Jakub Narebski <jnareb@gmail.com>]

Linus Torvalds wrote:
 
> On Sat, 10 Feb 2007, Theodore Tso wrote:

>> 3) The git-tag man page talks about GPG signing tags, but it doesn't
>> talk about how a GPG-signed tag is validated.  Does this happen
>> manually or automatically?
> 
> Use "git verify-tag X" to see something like this:
> 
>       [torvalds@woody linux]$ git-verify-tag v2.6.17
>       gpg: Signature made Sat 17 Jun 2006 06:49:59 PM PDT using DSA key ID 76E21CBB
>       gpg: Good signature from "Linus Torvalds (tag signing key) <torvalds@osdl.org>"
> 
> but you obviously need to have the public key in question available to 
> you.

One of the solutions, used in git.git repository, is to put public key
as a out-of-tree blob using git-hash-object, then tag it using singed tag
with instruction about how to extract key in the tag message (tag comment).

 $ git cat-file -p junio-gpg-pub
 object 0246401b5d117e01717149c413aa2f8702a83d4f
 type blob
 tag junio-gpg-pub
 tagger Junio C Hamano <junkio@cox.net> Tue Dec 13 16:33:29 2005 -0800

 GPG key to sign git.git archive.

 This blob object contains the GPG public key I use to sign git.git
 archive.

 To use it to verify tags I signed, do:

   $ git-cat-file blob junio-gpg-pub | gpg --import

 to import it into your keyring, and then

   $ git-verify-tag $tag_to_be_verified

-- 
Jakub Narebski
Warsaw, Poland
ShadeHawk on #git