On Fri, May 31, 2013 at 09:14:49AM +0100, Alex Bennée wrote:
> On 30 May 2013 20:30, John Keeping <john@xxxxxxxxxxxxx> wrote:
> > On Thu, May 30, 2013 at 06:21:55PM +0200, Thomas Rast wrote:
> >> Alex Bennée <kernel-hacker@xxxxxxxxxx> writes:
> >>
> >> > On 30 May 2013 16:33, Thomas Rast <trast@xxxxxxxxxxx> wrote:
> >> >> Alex Bennée <kernel-hacker@xxxxxxxxxx> writes:
> > <snip>
> >> > Will it be loading the blob for every commit it traverses or just ones that hit
> >> > a tag? Why does it need to load the blob at all? Surely the commit
> >> > tree state doesn't
> >> > need to be walked down?
> >>
> >> No, my theory is that you tagged *the blobs*. Git supports this.
>
> Wait is this the difference between annotated and non-annotated tags?
> I thought a non-annotated just acted like references to a particular
> tree state?
No, this is something slightly different. In Git there are four types
of object: tag, commit, tree and blob. When you have a heavyweight tag,
the tag reference points at a tag object (which in turn points at
another object). With a lightweight tag, the tag reference typically
points at a commit object.
However, there is no restriction that says that a tag object must point
to a commit or that a lightweight tag must point at a commit - it is
equally possible to point directly at a tree or a blob (although a lot
less common).
Thomas is suggesting that you might have a tag that does not point at a
commit but instead points to a blob object.
> > You can see if that is the case by doing something like this:
> >
> > eval $(git for-each-ref --shell --format '
> > test $(git cat-file -t %(objectname)^{}) = commit ||
> > echo %(refname);')
> >
> > That will print out the name of any ref that doesn't point at a
> > commit.
>
> Hmm that didn't seem to work.
You mean there was no output? In that case it's likely that all your
references do indeed point at commits.
> But looking at the output by hand I
> certainly have a mix of tags that are commits vs tags:
>
>
> 09:08 ajb@sloy/x86_64 [work.git] >git for-each-ref | grep "refs/tags"
> | grep "commit" | wc -l
> 1345
> 09:12 ajb@sloy/x86_64 [work.git] >git for-each-ref | grep "refs/tags"
> | grep -v "commit" | wc -l
> 66
This means that you have 1345 lightweight tags and 66 heavyweight tags,
assuming that all of the lines that don't say "commit" do say "tag".
By the way, I don't remember if you said which version of Git you're
using. If it's an older version then it's possible that something has
changed.
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