Removing qtwebengine from a Gentoo Linux installation

At the beginning of March I updated the world set in Gentoo Testing (~amd64) running the KDE suite (Plasma, Frameworks and Applications) on my secondary laptop, an eleven-year-old Compal NBLB2. It has a first-generation Core i7 CPU and the maximum amount of RAM that can be installed in that model (8 GB).

root # uname -a
Linux meshedgedx 5.0.11-gentoo #1 SMP Fri Jun 7 15:33:06 BST 2019 x86_64 Intel(R) Core(TM) i7 CPU Q 720 @ 1.60GHz GenuineIntel GNU/Linux

Gentoo Linux being a source-based distribution, updates to the largest packages take hours to build on older machines. Actually, some packages can take hours to build on newer machines too. On this older laptop I therefore merge the www-client/firefox-bin binary package instead of the www-client/firefox source-code package, and have installed Microsoft Office 2007 running in WINE instead of trying to merge the app-office/libreoffice source-code package (app-office/libreoffice-bin cannot be merged in this Testing installation because of incompatibility with the versions of installed dependencies, so it would only be a viable alternative binary package in a Stable installation).

Possibly the worst source-code package to build is dev-qt/qtwebengine. Nowadays it takes a ridiculous amount of time to build on this laptop, even with the jumbo-build USE flag set and MAKEOPTS="-j4" or even MAKEOPTS="-j1". The latest merge on the laptop took more than 14 hours:

root # genlop -t qtwebengine | tail -n 3
     Fri Mar  5 02:02:07 2021 >>> dev-qt/qtwebengine-5.15.2_p20210224
       merge time: 14 hours, 14 minutes and 7 seconds.


That is actually quite fast for that laptop; qtwebengine has sometimes taken two days to merge in the past.

What a waste of time and electricity, not to mention the unnecessary wear on the laptop (fan bearing; prolonged heat on components; etc.).

This one package is such a hassle to merge that it had me wondering if I should switch from Gentoo Linux to a binary distribution. Even on my six-year-old Compal W230SS laptop with a fourth-generation Core i7 CPU and 16 GB of RAM, qtwebengine takes circa five hours to merge. After several years putting up with this scourge of source-based Linux distributions on my secondary laptop, I had finally had enough and decided to excise the package, which did not look like an easy task with the full KDE suite installed. This is how I did it…

1. First I made sure the installation was up-to-date (see my earlier post ‘My system upgrade procedure for Gentoo Linux‘ for the steps I normally use to update all packages to their latest versions).

2. I ascertained which packages depended on qtwebengine:

root # equery depends qtwebengine
 * These packages depend on qtwebengine:
kde-apps/kaccounts-providers-20.12.2 (>=dev-qt/qtwebengine-5.15.2:5)
kde-apps/kalgebra-20.12.2 (>=dev-qt/qtwebengine-5.15.2:5[widgets])
kde-apps/kdenlive-20.12.2 (webengine ? >=dev-qt/qtwebengine-5.15.2:5)
kde-apps/kimagemapeditor-20.12.2 (>=dev-qt/qtwebengine-5.15.2:5[widgets])
kde-apps/ktp-text-ui-20.12.2 (>=dev-qt/qtwebengine-5.15.2:5[widgets])
kde-apps/marble-20.12.2 (webengine ? >=dev-qt/qtwebengine-5.15.2:5[widgets])
kde-apps/parley-20.12.2 (>=dev-qt/qtwebengine-5.15.2:5[widgets])
kde-plasma/kdeplasma-addons-5.21.1 (webengine ? >=dev-qt/qtwebengine-5.15.2:5)
kde-plasma/libksysguard-5.21.1 (webengine ? >=dev-qt/qtwebengine-5.15.2:5)
net-libs/signon-ui-0.15_p20171022-r1 (dev-qt/qtwebengine:5)
net-p2p/ktorrent-20.12.2 (rss ? >=dev-qt/qtwebengine-5.15.2:5)
                         (webengine ? >=dev-qt/qtwebengine-5.15.2:5)
www-client/falkon-3.1.0-r1 (>=dev-qt/qtwebengine-5.12.3:5[widgets])

3. I disabled the USE flag ‘webengine‘ globally:

root # nano /etc/portage/make.conf # Add -webengine to the list of USE flags

4. I merged the world set in order to incorporate the USE flag change:

root # emerge -uvDN @world

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R    ] kde-apps/marble-20.12.2:5/20.12::gentoo  USE="dbus geolocation kde nls pbf phonon -aprs -debug -designer -gps -handbook -shapefile -test -webengine*" 0 KiB
[ebuild   R    ] kde-apps/kdeedu-meta-20.12.2:5::gentoo  USE="-webengine*" 0 KiB
[ebuild   R    ] kde-apps/kdecore-meta-20.12.2:5::gentoo  USE="share thumbnail -handbook -webengine*" 0 KiB
[ebuild   R    ] net-p2p/ktorrent-20.12.2:5::gentoo  USE="bwscheduler downloadorder infowidget ipfilter kross logviewer magnetgenerator mediaplayer rss scanfolder shutdown stats upnp zeroconf -debug -handbook -test -webengine*" 0 KiB
[ebuild   R    ] kde-apps/kdenetwork-meta-20.12.2:5::gentoo  USE="bittorrent -dropbox -webengine*" 0 KiB
[ebuild   R    ] kde-apps/kdeutils-meta-20.12.2:5::gentoo  USE="cups rar -7zip -floppy -gpg -lrz -webengine*" 0 KiB

Total: 6 packages (6 reinstalls), Size of downloads: 0 KiB

>>> Verifying ebuild manifests
>>> Emerging (1 of 6) kde-apps/marble-20.12.2::gentoo
>>> Emerging (2 of 6) kde-apps/kdecore-meta-20.12.2::gentoo
>>> Emerging (3 of 6) net-p2p/ktorrent-20.12.2::gentoo
>>> Emerging (4 of 6) kde-apps/kdeutils-meta-20.12.2::gentoo
>>> Installing (2 of 6) kde-apps/kdecore-meta-20.12.2::gentoo
>>> Installing (4 of 6) kde-apps/kdeutils-meta-20.12.2::gentoo
>>> Installing (3 of 6) net-p2p/ktorrent-20.12.2::gentoo
>>> Emerging (5 of 6) kde-apps/kdenetwork-meta-20.12.2::gentoo
>>> Installing (5 of 6) kde-apps/kdenetwork-meta-20.12.2::gentoo
>>> Installing (1 of 6) kde-apps/marble-20.12.2::gentoo
>>> Emerging (6 of 6) kde-apps/kdeedu-meta-20.12.2::gentoo
>>> Installing (6 of 6) kde-apps/kdeedu-meta-20.12.2::gentoo
>>> Jobs: 6 of 6 complete                           Load avg: 1.93, 3.62, 3.86
>>> Auto-cleaning packages...

>>> No outdated packages were found on your system.

 * GNU info directory index is up-to-date.
 * After world updates, it is important to remove obsolete packages with
 * emerge --depclean. Refer to `man emerge` for more information.

5. I uninstalled packages that were no longer required by any other packages and also not required by me (I do not use the Falkon browser, Telepathy and KAlgebra, to give a few examples, and so did not mind various specific packages being removed):

root # emerge --ask --depclean

 * Always study the list of packages to be cleaned for any obvious
 * mistakes. Packages that are part of the world set will always
 * be kept.  They can be manually added to this set with
 * `emerge --noreplace `.  Packages that are listed in
 * package.provided (see portage(5)) will be removed by
 * depclean, even if they are part of the world set.
 * 
 * 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 --update --newuse --deep @world` prior to depclean.

Calculating dependencies... done!
>>> Calculating removal order...

>>> These are the packages that would be unmerged:                                                                                                                                                                                                

 kde-apps/parley
    selected: 20.12.2 
   protected: none 
     omitted: none 

 www-client/falkon
    selected: 3.1.0-r1 
   protected: none 
     omitted: none 

 kde-apps/kimagemapeditor
    selected: 20.12.2 
   protected: none 
     omitted: none 

 kde-apps/plasma-telepathy-meta
    selected: 20.12.2 
   protected: none 
     omitted: none 

 kde-apps/kalgebra
    selected: 20.12.2 
   protected: none 
     omitted: none 

 kde-apps/ktp-kded-module
    selected: 20.12.2 
   protected: none 
     omitted: none 

 kde-apps/ktp-desktop-applets
    selected: 20.12.2 
   protected: none 
     omitted: none 

 kde-apps/ktp-accounts-kcm
    selected: 20.12.2 
   protected: none 
     omitted: none 

 kde-apps/ktp-send-file
    selected: 20.12.2 
   protected: none 
     omitted: none 

 kde-apps/ktp-approver
    selected: 20.12.2 
   protected: none 
     omitted: none 

 kde-apps/ktp-auth-handler
    selected: 20.12.2 
   protected: none 
     omitted: none 

 kde-apps/ktp-contact-runner
    selected: 20.12.2 
   protected: none 
     omitted: none 

 kde-apps/ktp-text-ui
    selected: 20.12.2 
   protected: none 
     omitted: none 

 kde-apps/signon-kwallet-extension
    selected: 20.12.2 
   protected: none 
     omitted: none 

 net-im/telepathy-connection-managers
    selected: 2-r2 
   protected: none 
     omitted: none 

 kde-apps/ktp-filetransfer-handler
    selected: 20.12.2 
   protected: none 
     omitted: none 

 kde-apps/ktp-contact-list
    selected: 20.12.2 
   protected: none 
     omitted: none 

 net-irc/telepathy-idle
    selected: 0.2.0-r3 
   protected: none 
     omitted: none 

 net-voip/telepathy-salut
    selected: 0.8.1-r3 
   protected: none 
     omitted: none 

 net-voip/telepathy-gabble
    selected: 0.18.4-r2 
   protected: none 
     omitted: none 

 kde-apps/ktp-common-internals
    selected: 20.12.2 
   protected: none 
     omitted: none 

 net-libs/telepathy-accounts-signon
    selected: 2.1 
   protected: none 
     omitted: none 

 net-libs/libnice
    selected: 0.1.15 
   protected: none 
     omitted: none 

 net-libs/telepathy-logger-qt
    selected: 17.09.0 
   protected: none 
     omitted: none 

 net-im/telepathy-logger
    selected: 0.8.2-r1 
   protected: none 
     omitted: none 

 net-libs/gupnp-igd
    selected: 0.2.5-r10 
   protected: none 
     omitted: none 

 net-libs/libsignon-glib
    selected: 2.1 
   protected: none 
     omitted: none 

 net-libs/telepathy-qt
    selected: 0.9.8 
   protected: none 
     omitted: none 

 net-libs/gupnp
    selected: 1.2.4 
   protected: none 
     omitted: none 

 net-libs/gssdp
    selected: 1.2.3 
   protected: none 
     omitted: none 

 net-libs/libsoup
    selected: 2.70.0 
   protected: none 
     omitted: none 

 net-libs/libpsl
    selected: 0.21.1 
   protected: none 
     omitted: none 

 net-libs/glib-networking
    selected: 2.66.0 
   protected: none 
     omitted: none 

 net-im/telepathy-mission-control
    selected: 5.16.5 
   protected: none 
     omitted: none 

 net-libs/telepathy-glib
    selected: 0.24.1-r1 
   protected: none 
     omitted: none 

All selected packages: =kde-apps/ktp-desktop-applets-20.12.2 =kde-apps/ktp-contact-runner-20.12.2 =kde-apps/ktp-contact-list-20.12.2 =net-libs/telepathy-accounts-signon-2.1 =net-libs/telepathy-glib-0.24.1-r1 =net-voip/telepathy-salut-0.8.1-r3 =kde-apps/ktp-text-ui-20.12.2 =net-libs/libsignon-glib-2.1 =net-im/telepathy-connection-managers-2-r2 =kde-apps/ktp-accounts-kcm-20.12.2 =kde-apps/kimagemapeditor-20.12.2 =kde-apps/ktp-common-internals-20.12.2 =kde-apps/parley-20.12.2 =net-libs/libnice-0.1.15 =net-libs/libsoup-2.70.0 =kde-apps/ktp-auth-handler-20.12.2 =net-libs/gssdp-1.2.3 =net-irc/telepathy-idle-0.2.0-r3 =net-libs/libpsl-0.21.1 =kde-apps/kalgebra-20.12.2 =net-libs/gupnp-igd-0.2.5-r10 =kde-apps/ktp-filetransfer-handler-20.12.2 =kde-apps/ktp-send-file-20.12.2 =net-libs/gupnp-1.2.4 =kde-apps/ktp-kded-module-20.12.2 =net-im/telepathy-mission-control-5.16.5 =kde-apps/plasma-telepathy-meta-20.12.2 =net-voip/telepathy-gabble-0.18.4-r2 =net-im/telepathy-logger-0.8.2-r1 =kde-apps/signon-kwallet-extension-20.12.2 =net-libs/telepathy-logger-qt-17.09.0 =net-libs/telepathy-qt-0.9.8 =net-libs/glib-networking-2.66.0 =kde-apps/ktp-approver-20.12.2 =www-client/falkon-3.1.0-r1

>>> 'Selected' packages are slated for removal.
>>> 'Protected' and 'omitted' packages will not be removed.

Would you like to unmerge these packages? [Yes/No] Yes 
>>> Waiting 5 seconds before starting...
>>> (Control-C to abort)...
>>> Unmerging in: 5 4 3 2 1
>>> Unmerging (1 of 35) kde-apps/parley-20.12.2...
>>> Unmerging (2 of 35) www-client/falkon-3.1.0-r1...
>>> Unmerging (3 of 35) kde-apps/kimagemapeditor-20.12.2...
>>> Unmerging (4 of 35) kde-apps/plasma-telepathy-meta-20.12.2...
>>> Unmerging (5 of 35) kde-apps/kalgebra-20.12.2...
>>> Unmerging (6 of 35) kde-apps/ktp-kded-module-20.12.2...
>>> Unmerging (7 of 35) kde-apps/ktp-desktop-applets-20.12.2...
>>> Unmerging (8 of 35) kde-apps/ktp-accounts-kcm-20.12.2...
>>> Unmerging (9 of 35) kde-apps/ktp-send-file-20.12.2...
>>> Unmerging (10 of 35) kde-apps/ktp-approver-20.12.2...
>>> Unmerging (11 of 35) kde-apps/ktp-auth-handler-20.12.2...
>>> Unmerging (12 of 35) kde-apps/ktp-contact-runner-20.12.2...
>>> Unmerging (13 of 35) kde-apps/ktp-text-ui-20.12.2...
>>> Unmerging (14 of 35) kde-apps/signon-kwallet-extension-20.12.2...
>>> Unmerging (15 of 35) net-im/telepathy-connection-managers-2-r2...
>>> Unmerging (16 of 35) kde-apps/ktp-filetransfer-handler-20.12.2...
>>> Unmerging (17 of 35) kde-apps/ktp-contact-list-20.12.2...
>>> Unmerging (18 of 35) net-irc/telepathy-idle-0.2.0-r3...
>>> Unmerging (19 of 35) net-voip/telepathy-salut-0.8.1-r3...
>>> Unmerging (20 of 35) net-voip/telepathy-gabble-0.18.4-r2...
>>> Unmerging (21 of 35) kde-apps/ktp-common-internals-20.12.2...
>>> Unmerging (22 of 35) net-libs/telepathy-accounts-signon-2.1...
>>> Unmerging (23 of 35) net-libs/libnice-0.1.15...
>>> Unmerging (24 of 35) net-libs/telepathy-logger-qt-17.09.0...
>>> Unmerging (25 of 35) net-im/telepathy-logger-0.8.2-r1...
>>> Unmerging (26 of 35) net-libs/gupnp-igd-0.2.5-r10...
>>> Unmerging (27 of 35) net-libs/libsignon-glib-2.1...
>>> Unmerging (28 of 35) net-libs/telepathy-qt-0.9.8...
>>> Unmerging (29 of 35) net-libs/gupnp-1.2.4...
>>> Unmerging (30 of 35) net-libs/gssdp-1.2.3...
>>> Unmerging (31 of 35) net-libs/libsoup-2.70.0...
>>> Unmerging (32 of 35) net-libs/libpsl-0.21.1...
>>> Unmerging (33 of 35) net-libs/glib-networking-2.66.0...
>>> Unmerging (34 of 35) net-im/telepathy-mission-control-5.16.5...
>>> Unmerging (35 of 35) net-libs/telepathy-glib-0.24.1-r1...
Packages installed:   1651
Packages in world:    329
Packages in system:   43
Required packages:    1651
Number removed:       35

 * GNU info directory index is up-to-date.

Notice that the package qtwebengine had not been removed, so something still depended on it.

6. I checked if there were any packages still installed with a dependency on qtwebengine:

root # equery depends qtwebengine
 * These packages depend on qtwebengine:
kde-apps/kaccounts-providers-20.12.2 (>=dev-qt/qtwebengine-5.15.2:5)
kde-apps/kdenlive-20.12.2 (webengine ? >=dev-qt/qtwebengine-5.15.2:5)
kde-apps/marble-20.12.2 (webengine ? >=dev-qt/qtwebengine-5.15.2:5[widgets])
kde-plasma/kdeplasma-addons-5.21.1 (webengine ? >=dev-qt/qtwebengine-5.15.2:5)
kde-plasma/libksysguard-5.21.1 (webengine ? >=dev-qt/qtwebengine-5.15.2:5)
net-libs/signon-ui-0.15_p20171022-r1 (dev-qt/qtwebengine:5)
net-p2p/ktorrent-20.12.2 (rss ? >=dev-qt/qtwebengine-5.15.2:5)
                         (webengine ? >=dev-qt/qtwebengine-5.15.2:5)

As can be seen from the above output, the only remaining installed packages that ‘hard-depended’ on the ‘webengine‘ USE flag were kde-apps/kaccounts-providers-20.12.2 and net-libs/signon-ui-0.15_p20171022-r1.

Additionally, the package net-p2p/ktorrent-20.12.2 still depended on qtwebengine because the rss USE flag was enabled. So I added the line ‘net-p2p/ktorrent -rss‘ to the file /etc/portage/package.use/package.use and re-merged net-p2p/ktorrent. Actually, I re-merged the following packages just in case they needed to be rebuilt, although in retrospect I believe that was unnecessary:

     Fri Mar  5 05:37:26 2021 >>> kde-apps/kdecore-meta-20.12.2
     Fri Mar  5 05:37:55 2021 >>> kde-apps/kdeutils-meta-20.12.2
     Fri Mar  5 05:45:49 2021 >>> net-p2p/ktorrent-20.12.2
     Fri Mar  5 05:46:49 2021 >>> kde-apps/kdenetwork-meta-20.12.2
     Fri Mar  5 05:57:41 2021 >>> kde-apps/marble-20.12.2
     Fri Mar  5 05:58:15 2021 >>> kde-apps/kdeedu-meta-20.12.2

7. By now another day had dawned, so I checked if new versions of the ebuilds for any KDE packages had been uploaded to the Portage repositories:

root # emaint sync -a
root # eix-update && updatedb

8. I rebooted the laptop and checked which packages still depended on qtwebengine. It turned out that only the two packages with a hard-dependency on qtwebengine were still preventing me from removing it:

root # equery depends qtwebengine
 * These packages depend on qtwebengine:
kde-apps/kaccounts-providers-20.12.2 (>=dev-qt/qtwebengine-5.15.2:5)
net-libs/signon-ui-0.15_p20171022-r1 (dev-qt/qtwebengine:5)

9. I checked if any packages depended on those two packages:

root # equery depends kaccounts-providers
 * These packages depend on kaccounts-providers:
kde-misc/kio-gdrive-20.12.2 (>=kde-apps/kaccounts-providers-20.12.2:5)
# equery depends kio-gdrive
 * These packages depend on kio-gdrive:
kde-apps/kdenetwork-meta-20.12.2 (>=kde-misc/kio-gdrive-20.12.2:5)
root # equery depends signon-ui
 * These packages depend on signon-ui:
kde-apps/kaccounts-providers-20.12.2 (net-libs/signon-ui)

So kdenetwork-meta hard-depends on kio-gdrive, which does not make much sense, really, given that not all KDE users have a Google Drive account and those users therefore do not need the kio-gdrive package to be installed.

10. The contents of the kdenetwork-meta-20.12.3 ebuild look like this:

root # cat /usr/portage/kde-apps/kdenetwork-meta/kdenetwork-meta-20.12.3.ebuild
# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=7

DESCRIPTION="kdenetwork - merge this to pull in all kdenetwork-derived packages"
HOMEPAGE="https://kde.org/"

LICENSE="metapackage"
SLOT="5"
KEYWORDS="~amd64 ~arm64 ~ppc64 ~x86"
IUSE="+bittorrent dropbox +webengine"

RDEPEND="
        >=kde-apps/kdenetwork-filesharing-${PV}:${SLOT}
        >=kde-apps/kget-${PV}:${SLOT}
        >=kde-apps/kopete-${PV}:${SLOT}
        >=kde-apps/krdc-${PV}:${SLOT}
        >=kde-apps/krfb-${PV}:${SLOT}
        >=kde-apps/zeroconf-ioslave-${PV}:${SLOT}
        >=kde-misc/kdeconnect-${PV}:${SLOT}
        >=kde-misc/kio-gdrive-${PV}:${SLOT}
        >=net-irc/konversation-${PV}:${SLOT}
        bittorrent? (
                >=net-libs/libktorrent-${PV}:${SLOT}
                >=net-p2p/ktorrent-${PV}:${SLOT}
        )
        dropbox? ( >=kde-apps/dolphin-plugins-dropbox-${PV}:${SLOT} )
"

so I created an ebuild for kdenetwork-meta-20.12.3 in my local overlay with the dependency on kio-gdrive removed:

root # mkdir -p /usr/local/portage/kde-apps/kdenetwork-meta
root # cd /usr/local/portage/kde-apps/kdenetwork-meta
root # cp /usr/portage/kde-apps/kdenetwork-meta/kdenetwork-meta-20.12.3.ebuild .
root # nano kdenetwork-meta-20.12.3.ebuild # Delete the line containing ">=kde-misc/kio-gdrive-${PV}:${SLOT}"
root # ebuild kdenetwork-meta-20.12.3.ebuild manifest
>>> Creating Manifest for /usr/local/portage/kde-apps/kdenetwork-meta
root # # eix-update && updatedb

11. I re-merged the world set in order to update all KDE packages that now had a newer ebuild version:

root # emerge -uvDN @world

12. I rechecked the three packages that had depended on qtwebengine:

root # equery depends signon-ui
 * These packages depend on signon-ui:
kde-apps/kaccounts-providers-20.12.3 (net-libs/signon-ui)
root # equery depends kaccounts-providers
 * These packages depend on kaccounts-providers:
kde-misc/kio-gdrive-20.12.3 (kaccounts ? >=kde-apps/kaccounts-providers-20.08.3:5)
root # equery depends kio-gdrive
 * These packages depend on kio-gdrive:
root #

As can be seen above, my modified ebuild for kdenetwork-meta-20.12.3 had indeed removed the impediment to uninstalling kio-gdrive and therefore the impediment to uninstalling kaccount-providers and signon-ui.

13. I merged my modified version of kdenetwork-meta-20.12.3:

Up to this point kde-apps/kdenetwork-meta-20.12.3 had been merged from the main Portage tree:

root # eix -I kde-apps/kdenetwork-meta
[I] kde-apps/kdenetwork-meta
     Available versions:  (5) 20.08.3-r1 (~)20.12.3 (~)20.12.3[1]
       {+bittorrent dropbox +webengine}
     Installed versions:  20.12.3(5)(15:23:08 05/03/21)(bittorrent -dropbox -webengine)
     Homepage:            https://kde.org/
     Description:         kdenetwork - merge this to pull in all kdenetwork-derived packages

[1] "local_overlay" /usr/local/portage

I then merged the version from my local overlay:

root # emerge -1v kdenetwork-meta::local_overlay

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R    ] kde-apps/kdenetwork-meta-20.12.3:5::local_overlay [20.12.3:5::gentoo] USE="bittorrent -dropbox -webengine" 0 KiB

Total: 1 package (1 reinstall), Size of downloads: 0 KiB

>>> Verifying ebuild manifests
>>> Emerging (1 of 1) kde-apps/kdenetwork-meta-20.12.3::local_overlay
>>> Installing (1 of 1) kde-apps/kdenetwork-meta-20.12.3::local_overlay
>>> Jobs: 1 of 1 complete                           Load avg: 1.76, 0.88, 0.61
>>> Auto-cleaning packages...

>>> No outdated packages were found on your system.

 * GNU info directory index is up-to-date.
root # eix -I kde-apps/kdenetwork-meta
[I] kde-apps/kdenetwork-meta
     Available versions:  (5) 20.08.3-r1 (~)20.12.3 (~)20.12.3[1]
       {+bittorrent dropbox +webengine}
     Installed versions:  20.12.3(5)[1](16:40:43 05/03/21)(bittorrent -dropbox -webengine)
     Homepage:            https://kde.org/
     Description:         kdenetwork - merge this to pull in all kdenetwork-derived packages

[1] "local_overlay" /usr/local/portage

14. I checked which packages still depended on qtwebengine:

root # equery depends qtwebengine
 * These packages depend on qtwebengine:
kde-apps/kaccounts-providers-20.12.3 (>=dev-qt/qtwebengine-5.15.2:5)
kde-apps/kdenlive-20.12.3 (webengine ? >=dev-qt/qtwebengine-5.15.2:5)
kde-apps/marble-20.12.3 (webengine ? >=dev-qt/qtwebengine-5.15.2:5[widgets])
kde-plasma/kdeplasma-addons-5.21.2 (webengine ? >=dev-qt/qtwebengine-5.15.2:5)
kde-plasma/libksysguard-5.21.2 (webengine ? >=dev-qt/qtwebengine-5.15.2:5)
net-libs/signon-ui-0.15_p20171022-r1 (dev-qt/qtwebengine:5)
net-p2p/ktorrent-20.12.3 (rss ? >=dev-qt/qtwebengine-5.15.2:5)
                         (webengine ? >=dev-qt/qtwebengine-5.15.2:5)

Eureka! kdenetwork-meta no longer depends on qtwebengine.

15. I was then able to remove qtwebengine and the remaining packages that hard-depend on it:

root # emerge --ask --depclean qtwebengine kaccounts-providers signon-ui kio-gdrive

Calculating dependencies... done!
>>> Calculating removal order...

>>> These are the packages that would be unmerged:                                                                                                                                                                                                

 kde-misc/kio-gdrive
    selected: 20.12.3 
   protected: none 
     omitted: none 

 kde-apps/kaccounts-providers
    selected: 20.12.3 
   protected: none 
     omitted: none 

 net-libs/signon-ui
    selected: 0.15_p20171022-r1 
   protected: none 
     omitted: none 

 dev-qt/qtwebengine
    selected: 5.15.2_p20210224 
   protected: none 
     omitted: none 

All selected packages: =dev-qt/qtwebengine-5.15.2_p20210224 =kde-apps/kaccounts-providers-20.12.3 =kde-misc/kio-gdrive-20.12.3 =net-libs/signon-ui-0.15_p20171022-r1

>>> 'Selected' packages are slated for removal.
>>> 'Protected' and 'omitted' packages will not be removed.

Would you like to unmerge these packages? [Yes/No] Yes
>>> Waiting 5 seconds before starting...
>>> (Control-C to abort)...
>>> Unmerging in: 5 4 3 2 1
>>> Unmerging (1 of 4) kde-misc/kio-gdrive-20.12.3...
>>> Unmerging (2 of 4) kde-apps/kaccounts-providers-20.12.3...
>>> Unmerging (3 of 4) net-libs/signon-ui-0.15_p20171022-r1...
>>> Unmerging (4 of 4) dev-qt/qtwebengine-5.15.2_p20210224...
Packages installed:   1648
Packages in world:    329
Packages in system:   43
Required packages:    1648
Number removed:       4

 * GNU info directory index is up-to-date.

\o/ \o/ \o/ \o/ No more qtwebengine in Gentoo Linux Testing (~amd64) running KDE.

Of course this was only possible because I do not need the specific packages that had been uninstalled during this entire procedure. Other people may not be in the same position.

16. I added the following lines to the file /etc/portage/package.mask/package.mask so that the packages are not pulled in automatically when merging the world set in future:

dev-qt/qtwebengine
kde-apps/kdenetwork-meta::gentoo
kde-misc/kio-gdrive
kde-apps/kaccounts-providers
net-libs/signon-ui

17. In future I will have to modify new versions of the kdenetwork-meta ebuild and add them to my local overlay. Furthermore, if other packages become dependent on qtwebengine in future and I do not require them, I will have to repeat the above steps in order to remove them (if viable). I just hope I can keep the qtwebengine package from ever being installed again.

About Fitzcarraldo
A Linux user with an interest in all things technical.

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