From: Johannes Schindelin <johannes.schindelin@gmx.de>
Date: Tue, 24 Jul 2007 09:14:31 GMT
Subject: Re: [PATCH] git log -g: Complain, but do not fail, when no reflogs are there
Message-ID: <Pine.LNX.4.64.0707241011090.14781@racer.site>
In-Reply-To: <7vbqe2jr9m.fsf@assigned-by-dhcp.cox.net>

Hi,

On Mon, 23 Jul 2007, Junio C Hamano wrote:

> Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:
> 
> > When asking "git log -g --all", clearly you want to see only those refs
> > that do have reflogs, but you do not want it to fail, either.
> >
> > So instead of die()ing, complain about it, but move on to the other refs.
> 
> Hmph, do we even want to error(), I wonder...

Maybe not.  I thought it was some useful information, though.

> Can you tell, at that point, if there were explicit branch names given 
> originally on the command line, or the refs came
> from --all?

No:

                        if (!strcmp(arg, "--all")) {
                                handle_all(revs, flags);
                                continue;
                        }

which calls

static void handle_all(struct rev_info *revs, unsigned flags)
{
        struct all_refs_cb cb;
        cb.all_revs = revs;
        cb.all_flags = flags;
        for_each_ref(handle_one_ref, &cb);
}

which in turn calls

static int handle_one_ref(const char *path, const unsigned char *sha1, int flag,
 void *cb_data)
{
        struct all_refs_cb *cb = cb_data;
        struct object *object = get_reference(cb->all_revs, path, sha1,
                                              cb->all_flags);
        add_pending_object(cb->all_revs, object, path);
        return 0;
}

If you do not say --all, handle_revision_arg() is called, which calls 
add_pending_object thus:

                        add_pending_object(revs, &a->object, this);
                        add_pending_object(revs, &b->object, next);

or thus

        add_pending_object_with_mode(revs, object, arg, mode);

So no, there is not really a chance to see how the refs were specified at 
the time add_pending_object() is called.

Ciao,
Dscho