Re: About the Breaks: field.
>>"Guy" == Guy Maor <email@example.com> writes:
Guy> Guy Maor <firstname.lastname@example.org> writes:
>> Conflicts is like a reverse Depends. It affects package
>> Breaks is like a reverse Pre-Depends. It affects package
Guy> Some investigation reveals that I was wrong. A package which
Guy> conflicts with a package whose state is unpacked or higher won't
Guy> even unpack.
Under the current system ;-).
Guy> One major problem with Conflicts is that dpkg doesn't detect if
Guy> the Conflicts can be resolved by reordering package unpacking.
Guy> In fact, dpkg doesn't reorder package unpacking, only package
Deity will hopefully be more aware.
Guy> Santiago's proposal said that Breaks would cause a reorder of
Guy> package unpacking. I see no reason why it cannot be added for
Guy> Conflicts. Probably that's what Ian meant.
I still like the symmetry of depends and predepends with
conflicts and breaks. The stricter relationships require completion
of tasks before unpacking dependant packages. So a mere conflicts
relationship may not guarantee resolution before unpacking anymore;
we have breaks for that.
I think this improves efficiency of the massive upgrade
Guy> So the all too common case of: fooA_1 and fooB_1 are
Guy> installed. We'd like to upgrade to fooA_2 and fooB_2, but we MUST
Guy> upgrade fooA first. can't be done automatically!!
I'd like to throw this against my simulator. This would be
something that should be made to work.
Guy> Ideally, two things have to happen in dpkg:
Guy> 1. Unpacking is reordered according to Conflicts lines.
Amongst other things, yes, I am thinking about this. Unpacking
order also depends on other relationships as well ;-).
Guy> 2. New unpack-configure cycles are introduced to support
Guy> Pre-Depends. The current way of doing pre-dependencies is rather
Guy> crude (with --predep-package), and neither version of dpkg-ftp
Guy> even supports it!
This is also going to be done (looking at pkg-order as a
Guy> Unfortunately there's a nasty bout of Dpkg Programmer's Disease
Guy> going around. Anyone that looks at the source long enough to
Guy> have a vague idea of what's going on instantly drops off the
Guy> planet. I fear the worst... ;-)
I must increase my insurance policies ... ;-)
"In the carriages of the past you can't go anywhere." Maxim Gorkey
Manoj Srivastava <url:mailto:email@example.com>
Mobile, Alabama USA <url:http://www.datasync.com/%7Esrivasta/>
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