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Re: Why are depends rebuilt on "bmake update" ?

Alan Barrett <> writes:

> On Thu, 25 Oct 2012, Aleksej Saushev wrote:
>>Consider the following scenario.
>>There're two packages installed, A and B, A depends on B.
>>   A -> B
>>Now, B gets updated but A lags behind, instead B1 is introduced.
>>When running pkg_rr something triggers update of B.
>>It gets rebuilt, replaced, and triggers update of A.
>>Now the dependecies look like this:
>>   A -> [B1, yet to build]
>>        B
>>If B and B1 conflict, user is in trouble.
>>If B is high enough in forest, going back is even harder.
> Yes, that can easily happen.  I have most often seen it when a package
> is split.  For example:
>    T1:  You install usefulpkg-1.0, which depends on sometool-1.0
>    T2:  sometool version 2 is released, and pkgsrc decides to
>         split it into sometool-base-2.0 and sometool-2.0,
>         with sometool-2.0 depending on sometool-base-2.0.
>         sometool-base-2.0 is marked as conflicting with sometool-1.0.
>         pkgsrc changes usefulpkg-1.0nb1 to depend on sometool-base-2.0,
>         where usefulpkg-1.0 used to depend on sometool-1.0.
>    T3:  You update your pkgsrc tree, and run pkg_rr.
>         pkg_rr wants to upgrade usefulpkg from version 1.0 to 1.0nb1.
>         pkg_rr needs to build sometool-base-2.0 as a dependency for
>         usefulpkg-1.0nb1

I agree with the scenario entirely, but nits:

  pkg_rr will try to update sometool-1.0 to sometool-2.0 first

  if not, the building of sometool-base-2.0 will be as a dependsd on
  usefulpkg-1.0nb1 as a build dependency from make replace

>         sometool-base-2.0 can't be installed, because it conflicts with
>         sometool-1.0.
>    T4:  You figure out what's wrong, manually delete sometool-1.0,
>         run pkg_rr again, and now it works.

Agreed that this is a serious issue with the pkg_rr approach.

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