On 10/10/13 22:06, Dmitrii Kashin wrote:
> berenger.mo...@neutralite.org writes:
>
>> In the same priority range, the package which will be installed is the
>> one with the highest priority, so it is fine to have one set of
>> package with 500 ( or I could take 600 or any other value ) for low
>> priority, and the other at 900 ( or 800 or... ), so that the version
>> with 900 will be installed against the lower one, even if the lower
>> one is more recent.
>
> Oh... Truely? I thought differently and was sure I am right.
>
> I just skimmed again through apt_preferences man page, but did not find
> such examples or explanations. Where's it documented?
For reference, the section in apt_preferences(5) that documents this is:
> APT then applies the following rules, listed in order of precedence, to
> determine which version of a package to install.
> · Never downgrade unless the priority of an available version exceeds
> 1000. ("Downgrading" is installing a less recent version of a
> package in place of a more recent version. Note that none of APT's
> default priorities exceeds 1000; such high priorities can only be
> set in the preferences file. Note also that downgrading a package
> can be risky.)
> · Install the highest priority version.
> · If two or more versions have the same priority, install the most
> recent one (that is, the one with the higher version number).
> · If two or more versions have the same priority and version number
> but either the packages differ in some of their metadata or the
> --reinstall option is given, install the uninstalled one.
As you can see, it uses the priority first, and then the version number.
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