Re: [PATCH v2] symbolic-ref: teach "--[no-]recurse" option

> Suppose you are managing many maintenance tracks in your project,
> and some of the more recent ones are maint-2.36 and maint-2.37.
> Further imagine that your project recently tagged the official 2.38
> release, which means you would need to start maint-2.38 track soon,
> by doing:
> 
>   $ git checkout -b maint-2.38 v2.38.0^0
>   $ git branch --list 'maint-2.3[6-9]'
>   * maint-2.38
>     maint-2.36
>     maint-2.37
> 
> So far, so good.  But it also is reasonable to want not to have to
> worry about which maintenance track is the latest, by pointing a
> more generic-sounding 'maint' branch at it, by doing:
> 
>   $ git symbolic-ref refs/heads/maint refs/heads/maint-2.38
> 
> which would allow you to say "whichever it is, check out the latest
> maintenance track", by doing:
> 
>   $ git checkout maint
>   $ git branch --show-current
>   maint-2.38
> 
> It is arguably better to say that we are on 'maint-2.38' rather than
> on 'maint', and "git merge/pull" would record "into maint-2.38" and
> not "into maint", so I think what we have is a good behaviour.
> 
> One thing that is slightly irritating, however, is that I do not
> think there is a good way (other than "cat .git/HEAD") to learn that
> you checked out 'maint' to get into that state.  Just like the output
> of "git branch --show-current" shows above, "git symbolic-ref HEAD"
> would report 'refs/heads/maint-2.38', bypassing the intermediate
> symbolic ref at 'refs/heads/maint' that is pointed at by HEAD.
> 
> The internal resolve_ref() API already has the necessary support for
> stopping after resolving a single level of a symbolic-ref, and we
> can expose it by adding a "--[no-]recurse" option to the command.
>