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Q&A What does `emerge --update --newuse --deep @world` have to do with package removal?

In Debian-based distributions, one can update the system with apt upgrade and cleanup unused dependencies with apt autoremove. Period. On Gentoo that is apparently not as straightforward. From G...

0 answers · posted 2y ago by Quasímodo‭ · last activity 8mo ago by Mithical‭

Question gentoo emerge dependencies

#2: Post edited by

Quasímodo‭ · 2021-08-03T17:11:08Z (over 2 years ago)
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In Debian-based distributions, one can update the system with `apt upgrade` and
cleanup unused dependencies with `apt autoremove`. Period.
On Gentoo that is apparently not as straightforward. From
[Gentoo Cheat Sheet: Package removal][1]:
> The recommended way to remove a package is by using `emerge --deselect`. This
> removes the specified package from the @world set (i.e. says the package is no
> longer wanted). To clean up the system afterwards, run depclean as given below.
>
> emerge --ask --depclean
>
> As a safety measure, depclean will not remove any packages unless all
> required dependencies have been resolved. As a consequence of this, it often
> becomes necessary to run:
>
> emerge --ask --verbose --update --newuse --deep @world
I understand `emerge --deselect` and `emerge --depclean`; Together they work
as `apt remove --autoremove`.
I do not understand the last paragraph though. What does "depclean will not remove any
packages unless all required dependencies have been resolved" mean exactly?
Surely enough depclean won't remove dependencies currently in use. Why is it
necessary to run the *update* command then? What does it have to do with
package *removal*?
[1]: https://wiki.gentoo.org/wiki/Gentoo_Cheat_Sheet#Package_removal

In Debian-based distributions, one can update the system with `apt upgrade` and
cleanup unused dependencies with `apt autoremove`. Period.
On Gentoo that is apparently not as straightforward. From
[Gentoo Cheat Sheet: Package removal][1]:
> The recommended way to remove a package is by using `emerge --deselect`. This
> removes the specified package from the @world set (i.e. says the package is no
> longer wanted). To clean up the system afterwards, run depclean as given below.
>
> emerge --ask --depclean
>
> As a safety measure, depclean will not remove any packages unless all
> required dependencies have been resolved. As a consequence of this, it often
> becomes necessary to run:
>
> emerge --ask --verbose --update --newuse --deep @world
I understand `emerge --deselect` and `emerge --depclean`; Together they work
as `apt remove --autoremove`.
I do not understand the last paragraph though. What does "depclean will not remove any
packages unless all required dependencies have been resolved" mean exactly?
Surely enough depclean won't remove dependencies currently in use. Why is it
necessary to run the *update* command then? What does it have to do with
package *removal*?
The [Emerge manual][2] was not of much enlightening here; It actually employs the very same wording.
[1]: https://wiki.gentoo.org/wiki/Gentoo_Cheat_Sheet#Package_removal
[2]: https://dev.gentoo.org/~zmedico/portage/doc/man/emerge.1.html

gentoo emerge

gentoo emerge dependencies

#1: Initial revision by

Quasímodo‭ · 2021-08-03T11:55:47Z (over 2 years ago)

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What does `emerge --update --newuse --deep @world` have to do with package removal?

In Debian-based distributions, one can update the system with `apt upgrade` and 
cleanup unused dependencies with `apt autoremove`. Period.

On Gentoo that is apparently not as straightforward. From 
[Gentoo Cheat Sheet: Package removal][1]:

> The recommended way to remove a package is by using `emerge --deselect`. This
> removes the specified package from the @world set (i.e. says the package is no
> longer wanted). To clean up the system afterwards, run depclean as given below.
>
>     emerge --ask --depclean
>
> As a safety measure, depclean will not remove any packages unless all
> required dependencies have been resolved. As a consequence of this, it often
> becomes necessary to run:
>
>     emerge --ask --verbose --update --newuse --deep @world

I understand `emerge --deselect` and `emerge --depclean`; Together they work 
as `apt remove --autoremove`.

I do not understand the last paragraph though. What does "depclean will not remove any 
packages unless all required dependencies have been resolved" mean exactly? 
Surely enough depclean won't remove dependencies currently in use. Why is it
necessary to run the *update* command then? What does it have to do with
package *removal*?

[1]: https://wiki.gentoo.org/wiki/Gentoo_Cheat_Sheet#Package_removal

gentoo emerge

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