On Thu, 16 Oct 2014, Miles Fidelman wrote:
> As I dig more into the whole question of installing alternate init systems,
> I realize that I'm a bit confused about the behavior of apt- when it comes
> to virtual packages; and I can't find any documentation that clarifies
> things.
You're looking for Policy ยง7.5, specifically:
To specify which of a set of real packages should be the default to
satisfy a particular dependency on a virtual package, list the real
package as an alternative before the virtual one.
> I know I ran across this at some point when installing Postfix - but I
> can't for the life of me remember how this all worked out, an can't
> find documentation anywhere.
postfix Provides: mail-transport-agent.
Things that need an MTA depend on exim4 | mail-transport-agent; this is
how the default is defined.
--
Don Armstrong http://www.donarmstrong.com
He no longer wished to be dead. At the same time, it cannot be said
that he was glad to be alive. But at least he did not resent it. He
was alive, and the stubbornness of this fact had little by little
begun to fascinate him -- as if he had managed to outlive himself, as
if he were somehow living a posthumous life.
-- Paul Auster _City of Glass_
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