I'd like to discuss the topic about virtual provides in a general
context (not related to MySQL->MariaDB replacement) to find out what
actually is a consensus in Fedora about an issue when "two packages
provide the same (not only) virtual symbol" -- particularly what package
maintainers could/should depend on.
On 03/15/2013 04:22 PM, James Antill wrote:
On Wed, 2013-03-13 at 18:08 +0100, Honza Horak wrote:
>I've spent some time deep in yum and it seems to be better than I
>thought now. First, the magic about choosing one provider from more
>alternatives is not so dark any more (it was worse few years before) --
>it's actually documented at [1] now.
It's documented what the current version of yum does, and it's
documented mostly for information purposes ... if you want to install
"XYZ" and that is provided by "FOO" and "BAR" then installing either is
correct (even if it's not what you want).
That's probably how it should work eventually, but I believe we should
also be *sure* what will be installed in case nobody requires either FOO
nor BAR explicitly -- something like distribution-wide default.
Currently, we can follow the steps how scores of providers are count
[1]. However, since you wrote "it's documented mostly for information
purposes", the question is -- can we depend on it?
Let me elaborate that a bit more. If we can depend on it, it means it is
defined somehow -- so it would make sense also to re-define that
behavior by user if there's a reason for that (i.e. let users to choose
one of the provider).
The idea I've in my mind is to achieve this by a yum plugin (which would
use compare_providers hook), which would basically adjust scores for
possible providers according to a config file.
In case of MySQL/mariadb (just for demonstration) the config file would
contain say:
MySQL +10000
mariadb -10000
which would tell yum to prioritize MySQL.
I'm sure that there are several other use cases for such utility. It
would bring a bit more complexity on the one hand, but would decrease
ambiguity in specific cases on the other hand.
Any ideas about such tool/plugin?
Cheers,
Honza
[1] http://yum.baseurl.org/wiki/CompareProviders
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