Re: [gentoo-user] dynamic deps, wtf are they exactly

[Mike Gilbert]

On Sun, Sep 27, 2015 at 11:28 AM, Alan McKinnon <alan.mckinnon@×××××.com> wrote:
> On 27/09/2015 17:12, Mike Gilbert wrote:
>> On Sun, Sep 27, 2015 at 11:07 AM, Alan McKinnon <alan.mckinnon@×××××.com> wrote:
>>> So, my question: wtf are dynamic deps? How do I find the records they
>>> must leave behind in portage?
>>
>> For the latter question, you can rebuild affected packages like so:
>>
>> emerge --with-bdeps=y @changed-deps.
>>
>> You can also add --changed-deps to your emerge command line for world updates.
>>
>
>
> Thanks. Running that gives surprising and unexpected results. I'm now
> curious what changed-deps really does, and the man page is terse on this.
>
> I would have thought portage already does that automatically, but I see
> a difference. If a package's deps change, but everything is still
> satisfied, portage will do nothing. Does @changed-deps rebuild
> everything that changed anyway, regardless is portage thinks it still OK?

Basically, yes. If [R]DEPEND in /var/db/pkg is different from the
values in the ebuilds in the tree, @changed-deps will select it.

> Also, these two similar commands return different results (I have
> bdeps=y in DEFAULT_OPTS btw):
>
> emerge -uND --changed-deps=y world         (51 packages)
> emerge @changed-deps                       (11 packages)
>
> Do you know why those commands give different results?
> The smaller list is a strict subset of the longer one.

That difference is surprising; you would probably need to ask the
portage developers to get a real answer.