Re: [PATCH/RFC] git-svn: don't create master if another head exists

[Marcin Owsiany <marcin@owsiany.pl>]

On Sun, Jun 24, 2012 at 10:47:04PM -0700, Junio C Hamano wrote:
> Marcin Owsiany <marcin@owsiany.pl> writes:
> 
> > diff --git a/git-svn.perl b/git-svn.perl
> > index 0b074c4..90f3d06 100755
> > --- a/git-svn.perl
> > +++ b/git-svn.perl
> > @@ -1613,6 +1613,8 @@ sub post_fetch_checkout {
> >  	}
> >  
> >  	my $valid_head = verify_ref('HEAD^0');
> > +	my @heads_commits = eval { command(qw(show-ref --heads --hash)) };
> > +	return if $valid_head and grep { $_ eq $valid_head } @heads_commits;
> >  	command_noisy(qw(update-ref refs/heads/master), $gs->refname);
> >  	return if ($valid_head || !verify_ref('HEAD^0'));
> 
> This looks like a typical XY solution.

Can you please explain wha an "XY solution" is? I'm not familiar with
this expression.

>  What are you really trying
> to validate?  "HEAD" points at an existing branch and you do not
> care what branch it is?

Yes. I think.

>  HEAD may not even point at a valid branch
> but can be detached as long as it happens to point at a commit that
> is at the tip of some branch (hence building further commit on HEAD
> will break the condition you are checking in the above code)?

The more questions you ask, the less I feel I know about how git works
:-)

-- 
Marcin Owsiany <marcin@owsiany.pl>              http://marcin.owsiany.pl/
GnuPG: 2048R/02F946FC  35E9 1344 9F77 5F43 13DD  6423 DBF4 80C6 02F9 46FC

"Every program in development at MIT expands until it can read mail."
                                                              -- Unknown