Re: Breaks: instead of Conflicts: for transitional packages

[Vincent Fourmond <fourmond@debian.org>]

  Hi Antonio,

On 21/06/11 01:23, Antonio Terceiro wrote:
> Hi Vincent,
> > > Please double check your packages and make sure your new ruby-foo
> > > `Breaks: libfoo-ruby, libfoo-ruby1.8` instead of Conflicts: (and make
> > > sure that's a versioned Breaks: in the same way we have done until now
> > > with versioned Conflicts:)
> >
> >    Hmmmm... I also thought of that, but I'm unsure now. Break will only
> > ensure that the packages are not configured at the same time, while
> > Conflict will ensure they are not unpacked at the same time. Imagine
> > that we have the old libruby-foo1.8 and the new ruby-foo.
> > libruby-foo1.8 have files in /usr/lib/ruby/1.8, while the newer has
> > files in /usr/lib/ruby/vendor_ruby. The problem is that if the old
> > libruby-foo1.8 is unpacked but unconfigured for some reason while
> > ruby-foo is installed and configured (which is allowed with Breaks,
> > but not with Conflicts), the new /usr/bin/foo executable (from
> > ruby-foo) will use preferably code from /usr/lib/ruby/1.8 (the old
> > code),
>
> Vendor dirs have precedence over the interpreter's library directory:
>
> terceiro@morere:~ (home)$ ruby1.8 -e 'puts $:'
> /usr/local/lib/site_ruby/1.8
> /usr/local/lib/site_ruby/1.8/i486-linux
> /usr/local/lib/site_ruby/1.8/i386-linux
> /usr/local/lib/site_ruby
> /usr/lib/ruby/vendor_ruby/1.8
> /usr/lib/ruby/vendor_ruby/1.8/i486-linux
> /usr/lib/ruby/vendor_ruby
> /usr/lib/ruby/1.8
> /usr/lib/ruby/1.8/i486-linux
> /usr/lib/ruby/1.8/i386-linux

  OK, great, then my point is moot.

  That also means that we should add this particular feature 
(precedence of the vendor dir over system dir in RUBYLIB path) in the 
Ruby policy.

  Cheers,

	Vincent
--
Vincent Fourmond, Debian Developer
http://vince-debian.blogspot.com/

Some pirates achieved immortality by great deeds of cruelty
and derring-do. Some achieved immortality by amassing great
wealth. But the captain had long ago decided that he would,
on the whole, prefer to achieve immortality by not dying.
 -- Terry Pratchet, the Colour of Magic

Vincent, listening to Psycho (System of a Down)