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Re: Can imagemagick really be safely purged or removed?

On 30/10/17 15:46, Celejar wrote:
> On Sun, 29 Oct 2017 08:28:46 -0400
> The Wanderer <wanderer@fastmail.fm> wrote:
>> On 2017-10-29 at 07:49, Jörg-Volker Peetz wrote:
>>> Celejar wrote on 10/24/17 15:09:
>>>> On Tue, 24 Oct 2017 08:52:46 +0200
>>>> Jörg-Volker Peetz <jvpeetz@web.de> wrote:
>>>>> I forgot that you showed the dependency on cups-filters in your original mail.
>>>>> On testing cups-filters 1.17.9-1 does not depend on imagemagick, it only
>>>>> recommends it. And I use APT::Install-Recommends "false"; in /etc/apt/apt.conf.
>>>>> Therefore, on this system imagemagick could be removed.
>>>> Interesting, thanks. So they changed the dependency from 'depends' to
>>>> 'recommends', but they're still 'recommending' a dummy package.
>>> Taking another look at package imagemagick-6.q16 (version 8: it
>>> states that it provides imagemagick. Therefore, I don't understand what's going
>>> on on your system and there's nothing wrong with package cups-filters, I think.
>> My guess involves vague memories of there being an issue with versioned
>> Provides: - although I thought that was more "you can't Provides: a
>> specific version", not "a versioned Depends: won't be satisfied by a
>> Provides: from a package with a suitable version number".
> I don't understand this stuff well enough to add anything to the
> conversation. All I know is that I still can't remove imagemagick
> despite the fact that imagemagick-6.q16 "Provides:" imagemagick.
> Celejar

imagemagick-6.q16 Provides: imagemagick, but not a specific version

cups-filters Depends: imagemagick (>= 6.4~)

The real imagemagick package is at 8: (on my
machine anyway), which satisifies the cups-filters dependency.

The system doesn't know whether the version of imagemagick Provided by
imagemagick-6.q16 is new enough, so you still need the real package.


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