Re: git "tag" objects implemented - and a re-done commit

Are tag objects referenced by trees (and thus limited in scope) or are 
they stand-alone entities in the repository? The latter would be bad for 
shared object storages. Also, if I delete and recreate tags, will the old 
tag remain in the tree or will the file in the object storage disapear? 
So far all objects were always persistent, which is a nice property to 
have.

Andreas

On Mon, 25 Apr 2005, Linus Torvalds wrote:

> 
> Ok, I just pushed out my "tag" object implementation, and due to some
> local braindamage over here, I ended up re-doing one commit, so if you
> happened to pull my 'git' tree at _just_ the right time, you will have a
> commit object named 06a02346f6a2e9ff113c189629ff7148f5141bb0 in your git 
> repository, which is not exactly bogus, but which I ended up undoing.
> 
> So if you've been pulling my git stuff, check your "git log" for whether
> you find that commit in your stuff. If you do, I guess it doesn't much
> matter (ie should all merge in cleanly), but if you want to match my tree,
> you should first undo it if it's your HEAD commit (by setting your HEAD to
> the _parent_ of that commit, and then running the git-prune-script thing).
> 
> Anyway, I decided that my original model for tags was the right one, with 
> a trivial extension. Notably, if you want to tag a single file or a tree 
> object, go wild. The tag object format is:
> 
> 	object <sha1>
> 	type <type>
> 	tag <tag>
> 	.. free-form commentary and signature of this all ..
> 
> and the "git-mktag" program verifies that the three first lines are valid 
> before it accepts it and writes it as a git object.
> 
> Right now the tags don't do anything, except fsck can verify them (not the
> signature - git doesn't even specify any particular format, and you may
> validly have unsigned tags in your tree), and will print out something
> like
> 
> 	tagged commit e83c5163316f89bfbde7d9ab23ca2e25604af290 (v2.6.12-rc2)
> 
> if you were to have such a tag-object in your object database (you don't, 
> because I've not generated one, but hey..)
> 
> 		Linus
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