Find out why a certain package is installed?

[midnite]

How to find out which package in @world (or in profile, or which use flag?) caused the installation of a certain package?

equery depends elogind lists only depth of 1, which is usually not helpful.

equery depends --indirect elogind produces too verbose result.

ref - https://wiki.gentoo.org/wiki/Equery#Listing_all_packages_depending_on_a_package_with_depends_.28d.29

In short, any programs to show only items in @world within the output of equery depends --indirect elogind? (Probably using equery depends --indirect elogind | grep -e 'A\|B\|C' ?)

For example, A, B, C are packages in @world. And A depends on X depends on Y depends on Z depends on elogind. Assume that no other packages depend on elogind. The desired output is:

[logrusx]

Elogind is most certainly part of your profile.

You selected an openrc profile, and you also installed Gnome or KDE or something else that needs seat management or maybe you just selected an openrc/desktop profile.

Post your emerge --info

No there are no such programs. You can use emerge -pvc <package> to see what pulls it in, but you won't see a tree of dependencies, only the things directly depending on it.

Best regards,
Georgi

[midnite]

logrusx,

Thanks for reply.

Yes I am using default/linux/amd64/23.0/desktop/plasma profile. I am curious why elogind was pulled in before I install KDE.

Moreover, elogind is just an example. I would like to use equery depends --indirect <package> output more effectively.
_________________
- midnite.

[logrusx]

You can't use plasma without systemd or elogind. That's why when you select a plasma profile, it'll include either systemd or elogind.

There's no such program you're asking for. You can use equery depgraph and then follow the chain. Have in mind equery will not tell you what is effectively installed, it'll just look at the ebuild and spit all dependencies, no matter if they are conditional or not. You have to check it for yourself.

Another tool that may be useful is revdep-rebuild --library <path to a library> --pretend. This will give you a list of reverse dependencies for a library.

However I think you're trying to solve something backwards or a problem that isn't there.

Can you rephrase what's the issue you're trying to solve. I understand there's some genuine interest here, but what's the particular occasion you're trying to find this out?

Best Regards,
Georgi

[GDH-gentoo]

[Zucca]

[midnite]

Thanks all!

AFAIK equery depends --indirect <package> seems to be the only program with reverse dependency search.

I am trying to understand the output of equery --no-color --no-pipe depends --indirect elogind | tee /tmp/equery.elogind.output

[logrusx]

[Zucca]

[logrusx]

[GDH-gentoo]

What you seem to call "the root source packages" are the ones shown in lines that start with "@system requires" or "@selected requires" in the (possibly saved) output of emerge --pretend --depclean --verbose. I really can't recommend this command enough.
_________________

[Zucca]

[logrusx]