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Re: Feature Proposal: Rolling Updates (was Re: WHY I WANT TO STOP USING FEDORA!!!)



On Wed, Feb 11, 2009 at 6:08 AM, Mark Haney wrote:
> Alan Evans wrote:
>>
>> As I understand it, Gentoo doesn't suffer this because each user is
>> compiling their own package sets. Updating libfoo doesn't require
>> recursively redownloading every package that requires it because the
>> user already has the source to those programs. He just needs to
>> recompile them.
>
> Explain to me how doing an update in Fedora requires the same method?

I'm not sure I understood this question.

> If I update package 'appfoo' that requires 'libfoo' there's no
> difference between downloading and reinstalling the libfoo RPM along
> with the new version of 'appfoo' than it is recompiling libfoo in
> gentoo.  I /still/ have to download the source code to recompile it,
> unless I just happen to have that source (and it's not be updated)
> sitting in my portage cache.  The idea is the same, just a slightly
> different mechanism.  And with delta packages, this would be a cinch I
> would think.

But what about appbar that also requires libfoo? Unless I'm
misunderstanding how Gentoo works (which is possible), you don't need
to redownload appbar because libfoo was updated. You only need to
recompile appbar after updating libfoo.

This means that appbar on your machine is different than appbar on my
machine because each is compiled against a different set of libraries.
This is not a big deal since each machine is internally consistent.
But with a binary distro, the repository must be internally
consistent. This means that if a single package (even one I don't have
on my machine) requires a new libfoo then I have to update every
package on my machine that touches, even indirectly, libfoo, because
libfoo was updated in the repository, which caused apps that I do have
installed to be updated just to be compatible with the updated libfoo.

-Alan

(As I said, I might be wrong about how Gentoo works. But if you don't
keep source for installed packages handy for recompilation when libs
get updated then I wonder what is the point of Gentoo at all, unless
it's just the warm fuzzies of knowing that your binaries are compiled
against your particular arch.)


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