Re: Versionned dependencies
Goswin von Brederlow, 2012-02-09 11:14+0100:
> Tanguy Ortolo <tanguy+debian@ortolo.eu> writes:
>> While this is sufficient for most cases, it does not cover one
>> interesting case: a dependencies on a range of versions. For instance:
>> Package: xul-ext-adblock-plus
>> Depends: iceweasel (>= 3.6.13, << 12.0~a1+) | iceape (>= 2.1, << 2.9~a1+) | …
>
> That is just a
> Depends: iceweasel (>= 3.6.13) | iceape (>= 2.1),
> iceweasel (<< 12.0~a1+) | iceape (>= 2.1),
> iceweasel (>= 3.6.13) | iceape (<< 2.9~a1+),
> iceweasel (<< 12.0~a1+) | iceape (<< 2.9~a1+)
For two packages, yes, but as you noticed, it grows exponentially with
the number of packages. More specifically, the number of dependencies as
developped with de Morgan's laws is 2^n here.
> There is another solution: Dummy packages (build by xul-ext-adblock-plus)
>
> Package: xul-ext-adblock-plus
> Depends: xul-ext-adblock-plus-iceweasel | xul-ext-adblock-plus-iceape
>
> Package: xul-ext-adblock-plus-iceweasel
> Depends: iceweasel (>= 3.6.13), iceweasel (<< 12.0~a1+)
>
> Package: xul-ext-adblock-plus-iceape
> Depends: iceape (>= 2.1), iceape (<< 2.9~a1+)
>
> I'm not saying that is the way to do it but it is a possibility.
Yes, a possibility which has other interesting advantages, although it
may be difficult to implement.
> Why does it remove it? Or rather in which situations? A simple "upgrade"
> or "dist-upgrade" should keep back the package rather than remove
> iceape. Obviously if you force the issue it will remove iceape but that
> then is your own fault. I don't see how the situation would be different
> with depends instead of breaks. In both cases it is impossible to
> install a mismatching set of versions.
>
> This might be a bug in the frontent rather than xul-ext-adblock-plus.
No, you are correct by saying that a simple upgrade or safe-upgrade will
not remove it, but holding back a package for that reason is still a
problem, and anyway the incompatibility will be problematic for a stable
Debian release.
--
,--.
: /` ) Tanguy Ortolo <xmpp:tanguy@ortolo.eu> <irc://irc.oftc.net/Tanguy>
| `-' Debian Developer
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