[gentoo-user] Re: Rebuilding all dependants of a package

[Holger Hoffstätte]

On Mon, 19 Feb 2018 15:29:52 +0100, Branko Grubic wrote:

> On Mon, 19 Feb 2018 12:55:08 +0000 (UTC)
> Holger Hoffstätte <holger@××××××××××××××××××.com> wrote:
>
>> Hey,
>>
>> I'm not exactly new to portage, but one thing that I cannot seem to
>> figure out is how to rebuild all dependants of a package. Not
>> *dependencies*, dependants: packages that require said package.
>>
>> As a recent example: whenever go (the language) is updated to a new
>> version (say from 1.9 to 1.10, as it happended recently), I'd like to
>> rebuild docker & friends - or more specifically 'things that are
>> compiled with go'.
>>
>> The --changed-deps option doesn't seem to do the trick, so instead I
>> manually do a -vp --depclean on go and manually --oneshot all
>> installed packages that have their hands on it. This is obviously
>> stupid and error-prone.
>>
>> Am I missing something or is this really not easily possible?
>> Basically I'm looking for a hard --oneshot --revdep-rebuild with a
>> package argument.
>>
>> thanks,
>> Holger
>>
>>
>
> I never needed this, so I don't know how to do it directly with emerge
> (is it possible?), but you can use equery like this to get a list:
>
> equery -q d dev-lang/go
>
> -q/--quiet (minimal output)
> (d)epends (list all packages directly depending on ATOM)
>
> to get a list of packages installed which depend on dev-lang/go
> you can filter versions out of it and feed that to 'emerge -av1'.
>
> Or if you trust this ugly one-liner without filtering (probably ugliest
> thing, but seems to do the job):
>
> emerge -av1 $(for i in $(equery -q d sys-apps/util-linux); do echo
> "=$i"; done)

That was useful and saved me the time to sed & grep my way through the
equery output. Turning this into a generic script is easy enough.

Thank you very much!

cheers
Holger