docs: add post - use latest gnome and kde with distrobox

docs/README.md

@@ -23,6 +23,8 @@ graphical apps (X11/Wayland), and audio.
 - [Compatibility](compatibility.md)
 - [Usage](usage.md)
 - [Useful tips](useful_tips.md)
+- [Posts](posts/posts.md)
+  * [Run latest GNOME and KDE using distrobox](posts/run_latest_gnome_kde_on_distrobox.md)
 - [Featured Articles](featured_articles.md)
   * [Run Distrobox on Fedora Linux](featured_articles.md#featured-articles)
   * [Distrobox - A great item in the Linux toolbelt](featured_articles.md#featured-articles)

docs/posts/posts.md

@@ -0,0 +1,8 @@
+- [Distrobox](README.md)
+  * [Run latest GNOME or KDE using distrobox](run_latest_gnome_kde_on_distrobox.md)
+
+---
+
+## Latest posts
+
+- [Run latest GNOME or KDE using distrobox](run_latest_gnome_kde_on_distrobox.md)

docs/posts/run_latest_gnome_kde_on_distrobox.md

@@ -0,0 +1,143 @@
+- [Distrobox](../README.md)
+  * [Run latest GNOME and KDE using distrobox](run_latest_gnome_kde_on_distrobox.md)
+    - [Using a stable-release distribution](#using-a-stable-release-distribution)
+      * [Initializing the distrobox](#initializing-the-distrobox)
+      * [Running Latest GNOME](#running-latest-gnome)
+        + [Generate session file](#generate-session-file)
+      * [Running Latest KDE](#running-latest-kde)
+        + [Generate session file](#generate-session-file-1)
+        + [Add a couple of fixes](#add-a-couple-of-fixes)
+
+---
+
+# Using a stable-release distribution
+
+Lots of people prefer to run a distribution following a stable-LTS release cycle like Debian, UbuntuLTS or
+CentOS family (Almalinux, Rocky Linux). This ensures great stability on one hand, but package staling on the other.
+
+One way to counter this effect is to use a pet-container managed by Distrobox to run packages from much newer distributions
+without giving up on core base os stability.
+
+## Initializing the distrobox
+
+For this experiment we'll use Fedora Rawhide as our distrobox, and Centos 8 Stream as our host, so:
+
+`distrobox create --name fedora-rawhide --image registry.fedoraproject.org/fedora:rawhide`
+
+and
+
+`distrobox enter fedora-rawhide`
+
+## Running Latest GNOME
+
+First we need to change a couple of bits in the distrobox container to make host's systemd session
+accessible from within the host:
+
+```shell
+~$ distrobox enter fedora rawhide
+user@fedora-rawhide:~$ rm -rf /run/systemd/{seats,sessions,system,users}
+user@fedora-rawhide:~$ ln -s /run/host/run/systemd/{seats,sessions,system,users} /run/systemd
+```
+
+Then we can proceed to install GNOME in the container:
+
+```shell
+user@fedora-rawhide:~$ sudo dnf groupinstall GNOME
+```
+
+And let's grab a coffee while it finishes :-)
+
+After the `dnf` process finishes, we have GNOME installed in our container, now how do we
+use it?
+
+### Generate session file
+
+We need to add a desktop file for the session on the host's file system, so that it appears
+on your login manager (Be it SSDM or GDM)
+
+```shell
+[Desktop Entry]
+Name=GNOME on Wayland (fedora-rawhide distrobox)
+Comment=This session logs you into GNOME
+Exec=/usr/local/bin/distrobox-enter -n fedora-rawhide -- /usr/bin/gnome-session
+Type=Application
+DesktopNames=GNOME
+X-GDM-SessionRegisters=true
+```
+
+This file should be placed under `/usr/share/wayland-sessions/distrobox-gnome-wayland.desktop`
+
+Let's log out and voilá!
+
+![image](https://user-images.githubusercontent.com/598882/148703229-82905d23-f3d0-41bc-a048-d12cdf8066d0.png)
+![Screenshot from 2021-12-25 19-56-52](https://user-images.githubusercontent.com/598882/147391814-cb49e7b8-64bc-4975-a8d1-93f6fb23f28b.png)
+![Screenshot from 2021-12-25 20-03-16](https://user-images.githubusercontent.com/598882/147391867-ca29576b-8fb9-448c-a181-579482fb448d.png)
+
+We now are in a GNOME 42 session inside Fedora Rawhide while our main OS remains
+Centos.
+
+## Running Latest KDE
+
+We can do the same with KDE also, let's first set up the host's systemd session sharing with the container:
+
+```shell
+~$ distrobox enter fedora rawhide
+user@fedora-rawhide:~$ rm -rf /run/systemd/{seats,sessions,system,users}
+user@fedora-rawhide:~$ ln -s /run/host/run/systemd/{seats,sessions,system,users} /run/systemd
+```
+
+Then we can proceed to install KDE in the container:
+
+```shell
+user@fedora-rawhide:~$ sudo dnf groupinstall KDE
+```
+
+### Generate session file
+
+We need to add a desktop file for the session on the host's file system, so that it appears
+on your login manager (Be it SSDM or GDM)
+
+```shell
+[Desktop Entry]
+Exec=/usr/local/bin/distrobox-enter -- /usr/libexec/plasma-dbus-run-session-if-needed /usr/bin/startplasma-wayland
+DesktopNames=KDE
+Name=Plasma on Wayland )fedora-rawhide distrobox)
+X-KDE-PluginInfo-Version=5.23.3
+```
+
+This file should be placed under `/usr/share/wayland-sessions/distrobox-plasma.desktop`
+
+### Add a couple of fixes
+
+To make KDE work we need a couple more fixes to run both on the host and in the container.
+
+First in the host we need a reliable way to fix the permissions problem of the `/tmp/.X11-unix` directory.
+This directory should either belong to `root` or `$USER`. But in a rootless container, host's `root` is not
+mapped inside the container so we need to change the ownership from `root` to `$USER` each time.
+
+Let's add:
+
+```shell
+chown -R $USER:$USER /tmp/.X11-unix
+```
+
+to `~/.profile` file.
+
+We also need to add a process in autostart on which Plasma shell relies on a process called `kactivitymanagerd`.
+Not having host's systemd at disposal we can start it simply adding it to the ~/.profile file, add:
+
+```shell
+if [ -f /usr/libexec/kactivitymanagerd ]; then
+  /usr/libexec/kactivitymanagerd & disown
+fi
+```
+
+to `~/.profile` file.
+
+Let's log out and voilá!
+
+![image](https://user-images.githubusercontent.com/598882/148704789-3d799a85-51cc-4de7-9ee3-f54add4949bc.png)
+![image](https://user-images.githubusercontent.com/598882/148705044-7271af0c-0675-42f8-9f45-ad20ec53deca.png)
+
+We now are in latest KDE session inside Fedora Rawhide while our main OS remains
+Centos.