Fedora 33 : Can be better? part 017.

Today I will show you how Fedora distro Linux can be better in terms of the LXDE environment.

Fedora team come with Fedora LXDE on Spins, see this intro:

LXDE, the "Lightweight X11 Desktop Environment", is an extremely fast, performant, and energy-saving desktop environment. It maintained by an international community of developers and comes with a beautiful interface, multi-language support, standard keyboard shortcuts, and additional features like tabbed file browsing.

Fedora does not have a defined environment because multiple work environments can be set.

Today, I will show you how to use the LXDE environment with Fedora can be improved.

I often use a simple environment in Linux because:

• I have older hardware
• their simplicity allows me to make my personal settings to be more efficient;

Here are some examples of how we can improve the LXDE environment:

Using the ObConf tool

ObConf now easily installs new themes that use the .obt Openbox theme archive format for distribution.

[root@desk mythcat]# dnf search obconf
...
obconf.x86_64 : A graphical configuration editor for the Openbox window manager
[root@desk mythcat]# dnf install obconf.x86_64
Last metadata expiration check: 0:25:25 ago on Sat 13 Feb 2021 11:49:09 AM EET.
Package obconf-2.0.4-17.20150213git63ec47.fc33.x86_64 is already installed.
Dependencies resolved.
Nothing to do.
Complete!

Windows open on the center screen.

You need to add this source code to the end of the file named lxde-rc.xml.

<application type="normal">
<position>
 <x>center</x>
 <y>center</y>
</position>
</application>

Depending on the keyboard and configuration you can set key combinations for different functions such as the Fn key.

The Fn key is the wakeup key when the machine is suspended.

If anyone wants to map it to other functions, then that's okay.

Let's see one example with the lxde-rc.xml file.

<keybindkey="XF86AudioRaiseVolume">
<actionname="Execute">
<command>amixersetMaster5%+unmute</command></action>
</keybind>
<keybindkey="XF86AudioLowerVolume">
<actionname="Execute">
<command>amixersetMaster5%-unmute</command></action>
</keybind>
<keybindkey="XF86MonBrightnessDown">
<actionname="Execute">
<command>xbacklight-20</command>
<startupnotify><enabled>yes</enabled><name>Decreasescreenbrightness</name></startupnotify></action>
</keybind>
<keybindkey="XF86MonBrightnessUp">
<actionname="Execute">
<command>xbacklight+20</command>
<startupnotify><enabled>yes</enabled><name>Increasescreenbrightness</name></startupnotify></action>
</keybind>

You can now run this command for the changes to take effect each time you edit the lxde-rc.xml file:

[mythcat@desk ~]$ openbox --reconfigure

Settings for users and languages.

[mythcat@desk ~]$ lxappearance 
[root@desk mythcat]# lxdm-config 
[root@desk mythcat]# setxkbmap -layout "us,ro" -option "grp:alt_shift_toggle".

In conclusion, there are enough settings that can be included by both the LXDE development team and Fedora team in a simpler way to configure the LXDE environment.

I would like to have in the LXDE environment from Fedora, the Fedora widget, the Fedora theme, Fedora Color.

The Fedora development team could effortlessly include its own utility to manage these settings for LXDE or other work environments.

Fedora 33 : Meson build system.

Meson is a build system that is designed to be as user-friendly as possible without sacrificing performance. The main tool for this is a custom language that the user uses to describe the structure of his build. The main design goals of this language has been simplicity, clarity and conciseness. Much inspiration was drawn from the Python programming language, which is considered very readable, even to people who have not programmed in Python before., see the official webpage.

Let's test with an simple example on Fedora 33 distro.

First step, install this tool with DNF tool.

[root@desk mythcat]# dnf search meson
Last metadata expiration check: 2:20:41 ago on Thu 11 Feb 2021 08:39:26 PM EET.
============================== Name Exactly Matched: meson ==============================
meson.noarch : High productivity build system
[root@desk mythcat]# dnf install meson.noarch 
...
Installed:
  meson-0.55.3-1.fc33.noarch               ninja-build-1.10.2-1.fc33.x86_64              

Complete!

The next step is to create a C file with a simple example and one with the build file:

[mythcat@desk ~]$ mkdir CProjects
[mythcat@desk ~]$ cd CProjects/
[mythcat@desk CProjects]$ vi main.c
[mythcat@desk CProjects]$ vi meson.build

The C example file named main.c has this source code:

#include 

//
// main is where all program execution starts
//
int main(int argc, char **argv) {
  printf("Hello there.\n");
  return 0;
} 

The build file named meson.build comes with this content:

project('tutorial', 'c')
executable('demo', 'main.c') 

Use the meson with setup builddir and compile to build executable and run it.

[mythcat@desk CProjects]$ meson setup builddir
The Meson build system
Version: 0.56.2
Source dir: /home/mythcat/CProjects
Build dir: /home/mythcat/CProjects/builddir
Build type: native build
Project name: tutorial
Project version: undefined
C compiler for the host machine: cc (gcc 10.2.1 "cc (GCC) 10.2.1 20201125 (Red Hat 10.2.1-9)")
C linker for the host machine: cc ld.bfd 2.35-18
Host machine cpu family: x86_64
Host machine cpu: x86_64
Build targets in project: 1

Found ninja-1.10.2 at /bin/ninja
[mythcat@desk CProjects]$ cd builddir/
[mythcat@desk builddir]$ ls
build.ninja  compile_commands.json  meson-info	meson-logs  meson-private
[mythcat@desk builddir]$ meson compile
Found runner: ['/bin/ninja']
ninja: Entering directory `.'
[2/2] Linking target demo
[mythcat@desk builddir]$ ls
build.ninja  compile_commands.json  demo  demo.p  meson-info  meson-logs  meson-private
[mythcat@desk builddir]$ ./demo
Hello there.

You can see this run well.

Fedora 33 : Running Zeek - part 001.

Zeek is often used as a network analysis tool but can also be deployed as an IDS known as Intrusion Detection System.

The full documentation can be found on this website page.

Let's install this tool on Fedora 33 distro.

[root@desk mythcat]# dnf search zeek
Last metadata expiration check: 0:18:02 ago on Sun 07 Feb 2021 11:21:35 AM EET.
No matches found.
[root@desk mythcat]# dnf config-manager --add-repo 
https://download.opensuse.org/repositories/security:zeek/Fedora_33/security:zeek.repo
Adding repo from: https://download.opensuse.org/repositories/security:zeek/Fedora_33/security:zeek.repo
[root@desk mythcat]# dnf install zeek
The Zeek Network Security Monitor. (Fedora_33)  105 kB/s | 128 kB     00:01    
Last metadata expiration check: 0:00:01 ago on Sun 07 Feb 2021 11:40:31 AM EET.
...
  Verifying        : zeekctl-3.2.3-1.1.x86_64                               8/8 

Installed:
  libbroker-devel-3.2.3-1.1.x86_64       libpcap-devel-14:1.9.1-6.fc33.x86_64  
  openssl-devel-1:1.1.1i-1.fc33.x86_64   zeek-3.2.3-1.1.x86_64                 
  zeek-core-3.2.3-1.1.x86_64             zeek-devel-3.2.3-1.1.x86_64           
  zeek-libcaf-devel-3.2.3-1.1.x86_64     zeekctl-3.2.3-1.1.x86_64              

Complete!
[root@desk mythcat]# whereis zeek
zeek: /opt/zeek/bin/zeek
[root@desk mythcat]# whereis zeekctl
zeekctl: /opt/zeek/bin/zeekctl

I found this informations into the documentation area:

ZeekControl is an interactive shell for easily operating/managing Zeek installations on a single system or even across multiple systems in a traffic-monitoring cluster.

A Minimal Starting Configuration

These are the basic configuration changes to make for a minimal ZeekControl installation that will manage a single Zeek instance on the localhost:

• In $PREFIX/etc/node.cfg, set the right interface to monitor.
• In $PREFIX/etc/networks.cfg, comment out the default settings and add the networks that Zeek will consider local to the monitored environment.
• In $PREFIX/etc/zeekctl.cfg, change the MailTo email address to a desired recipient and the LogRotationInterval to a desired log archival frequency.

Next step is to configure and adjust your PATH environment variable:

[root@desk mythcat]# export PATH=/opt/zeek/bin:$PATH
[root@desk mythcat]# zeekctl

Welcome to ZeekControl 2.2.0

Type "help" for help.
...

Use install , start and diag commands on Zeek command line to check if the Zeek tool works fine.

If you received this error on diag command , then you need to set your network interface:

==== stderr.log
fatal error: problem with interface eth0 (pcap_error: SIOCGIFHWADDR: No such device (pcap_activate))

Let's fix this error using the files configuration:

[root@desk mythcat]# updatedb
[root@desk mythcat]# locate node.cfg
/opt/zeek/etc/node.cfg
[root@desk mythcat]# vi /opt/zeek/etc/node.cfg

I change the row with the interface= with my network interface.

You can find your interface with these commands:

[root@desk mythcat]# ip link show
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
...
[root@desk mythcat]# nmcli device status
DEVICE  TYPE      STATE                   CONNECTION 
...

Now I can run the zeekctl command an check if is all right.

And first issue reported by diag and zeekctl is this:

1612693272.168741 Reporter::WARNING Your interface is likely receiving invalid TCP and UDP checksums, most likely from NIC checksum offloading. By default, packets with invalid checksums are discarded by Zeek unless using the -C command-line option or toggling the 'ignore_checksums' variable. Alternatively, disable checksum offloading by the network adapter to ensure Zeek analyzes the actual checksums that are transmitted. /opt/zeek/share/zeek/base/misc/find-checksum-offloading.zeek, line 54

You can see this tool can provide good information for users.

Fedora 33 : C# and Google A.P.I .

In this tutorial, I will show you how to use C # with Google A.P.I. on Fedora Linux. 

You can find more C # tutorials written by me on the web. 

This tutorial was added here by me because it is used with Fedora 33 distro. 

You will need to set an authentication key in your google account, see the credentials page. 

I used Fedora Linux to install the NuGet command:

[root@desk mythcat]# dnf install nuget 
...
Installed:
  nuget-2.8.7-11.fc33.x86_64                                                    
Complete!

Use this command to install it:

[mythcat@desk CSharpProjects]$ nuget install Google.Apis.Discovery.v1 
Attempting to resolve dependency 'Google.Apis (= 1.10.0)'.
Attempting to resolve dependency 'Google.Apis.Core (≥ 1.10.0)'.
...
Attempting to resolve dependency 'Google.Apis (≥ 1.49.0)'.
'Google.Apis' already has a dependency defined for 'Google.Apis.Core'.

Create a basic C# project and test it:

[mythcat@desk CSharpProjects]$ mkdir booksAPI && cd booksAPI
[mythcat@desk booksAPI]$ dotnet new console
Getting ready...
...
[mythcat@desk booksAPI]$ dotnet run
Hello World!

Add Google A.P.I. to this project:

[mythcat@desk booksAPI]$ dotnet add package Google.Apis.Discovery.v1 --version 1.49.0
  Determining projects to restore...
log  : Restored /home/mythcat/CSharpProjects/booksAPI/booksAPI.csproj (in 8.86 sec).

Change the default project source code with this example and add your Google key:

using System;
using System.Threading.Tasks;

using Google.Apis.Discovery.v1;
using Google.Apis.Discovery.v1.Data;
using Google.Apis.Services;
namespace booksAPI
{
    class Program
    {
    [STAThread]
        static void Main(string[] args)
        {
            Console.WriteLine("Discovery API Sample");
            Console.WriteLine("====================");
            try
            {
                new Program().Run().Wait();
            }
            catch (AggregateException ex)
            {
                foreach (var e in ex.InnerExceptions)
                {
                    Console.WriteLine("ERROR: " + e.Message);
                }
            }
            Console.WriteLine("Press any key to continue...");
            Console.ReadKey();
        }

        private async Task Run()
        {
            // Create the service.
            var service = new DiscoveryService(new BaseClientService.Initializer
                {
                    ApplicationName = "Discovery Sample",
                    ApiKey="...",
                });

            // Run the request.
            Console.WriteLine("Executing a list request...");
            var result = await service.Apis.List().ExecuteAsync();

            // Display the results.
            if (result.Items != null)
            {
                foreach (DirectoryList.ItemsData api in result.Items)
                {
                    Console.WriteLine(api.Id + " - " + api.Title);
                }
            }
        }
    }
}

I used my key and this is the result of the run project:

[mythcat@desk booksAPI]$ dotnet run
Discovery API Sample
====================
Executing a list request...
abusiveexperiencereport:v1 - Abusive Experience Report API
acceleratedmobilepageurl:v1 - Accelerated Mobile Pages (AMP) URL API
accessapproval:v1 - Access Approval API
accesscontextmanager:v1beta - Access Context Manager API
...

Fedora 33 : Roblox and Wine.

Because I tried to install this platform, I will show you what works and what doesn't. 

At this moment Roblox Player cannot be run with Wine. 

I tested two ways to run it.

First is the roblox-linux-wrapper and the second is the direct way to install RobloxPlayerLauncher.exe.

The roblox-linux-wrapper works but you will get this error. 

The install process is simple:

[mythcat@desk ~]$ git clone https://github.com/roblox-linux-wrapper/roblox-linux-wrapper.git
Cloning into 'roblox-linux-wrapper'...
remote: Enumerating objects: 17, done.
remote: Counting objects: 100% (17/17), done.
remote: Compressing objects: 100% (16/16), done.
remote: Total 1471 (delta 7), reused 4 (delta 1), pack-reused 1454
Receiving objects: 100% (1471/1471), 380.74 KiB | 274.00 KiB/s, done.
Resolving deltas: 100% (901/901), done.

[mythcat@desk ~]$ whereis wine
wine: /usr/bin/wine /usr/lib/wine /usr/lib64/wine /usr/share/wine /usr/share/man/man1/wine.1.gz

[mythcat@desk ~]$ roblox-linux-wrapper/rlw
> main: Sourcing /home/mythcat/roblox-linux-wrapper/data/rlw-core.sh
> wineinitialize: sourcing /home/mythcat/.rlw/wine_choice

Another way is to download the EXE file and run it with Wine.

[mythcat@desk ~]$ wget http://setup.rbxcdn.com/RobloxPlayerLauncher.exe
wine RobloxPlayerLauncher.exe 
...

You can try to start a game on browser , select the Roblox Player and will get the same error. A good news is about Roblox Studio, this works very well:

[mythcat@desk ~]$ wget https://setup.rbxcdn.com/RobloxStudioLauncherBeta.exe
[mythcat@desk ~]$ wine RobloxStudioLauncherBeta.exe

My video card NVIDIA Corporation GT218 [GeForce 210] (rev a2) is not very good with this application , but works.

Fedora 33 : The new Wine 6.0.

The new released of Wine 6.0 comes with this intro:

The Wine team is proud to announce that the stable release of Wine 6.0 is now available. This release represents a year of development effort and over 8,300 individual changes. It contains a large number of improvements that are listed in the release notes below. The areas of major changes are:

- Core modules in PE format.

- Vulkan backend for WineD3D.

- DirectShow and Media Foundation support.

- Text console redesign. ...

About Wine:

Wine (originally an acronym for "Wine Is Not an Emulator") is a compatibility layer capable of running Windows applications on several POSIX-compliant operating systems, such as Linux, macOS, BSD. Instead of simulating internal Windows logic like a virtual machine or emulator, Wine translates Windows API calls into POSIX calls on-the-fly, eliminating the performance and memory penalties of other methods and allowing you to cleanly integrate Windows applications into your desktop.

I used the Wine repo to install easily this software:

[root@desk mythcat]# dnf config-manager --add-repo https://dl.winehq.org/wine-builds/fedora/33/winehq.repo
Adding repo from: https://dl.winehq.org/wine-builds/fedora/33/winehq.repo
[root@desk mythcat]# dnf install wine
WineHQ packages                                 1.8 MB/s | 1.2 MB     00:00    
Dependencies resolved.
================================================================================
 Package                       Arch   Version                     Repo     Size
================================================================================
Installing:
 wine                          x86_64 6.0-1.fc33                  updates  13 k
Installing dependencies:
 SDL2                          i686   2.0.14-1.fc33               updates 589 k
 cdparanoia-libs               i686   10.2-34.fc33                fedora   56 k
 gd                            i686   2.3.0-3.fc33                fedora  142 k
 graphene                      i686   1.10.2-4.fc33               fedora   71 k
 gstreamer1-plugins-base       i686   1.18.2-1.fc33               updates 2.1 M
 ...
  wine-opencl-6.0-1.fc33.x86_64                                                 
  wine-pulseaudio-6.0-1.fc33.i686                                               
  wine-pulseaudio-6.0-1.fc33.x86_64                                             
  wine-small-fonts-6.0-1.fc33.noarch                                            
  wine-symbol-fonts-6.0-1.fc33.noarch                                           
  wine-system-fonts-6.0-1.fc33.noarch                                           
  wine-systemd-6.0-1.fc33.noarch                                                
  wine-tahoma-fonts-6.0-1.fc33.noarch                                           
  wine-times-new-roman-fonts-6.0-1.fc33.noarch                                  
  wine-twain-6.0-1.fc33.i686                                                    
  wine-twain-6.0-1.fc33.x86_64                                                  
  wine-webdings-fonts-6.0-1.fc33.noarch                                         
  wine-wingdings-fonts-6.0-1.fc33.noarch                                        

Complete! 

You can build it from source code:

[mythcat@desk ~]$ cd wine-6.0/
[mythcat@desk wine-6.0]$ ls
aclocal.m4  configure.ac   fonts    LICENSE.OLD  nls	   server
ANNOUNCE    COPYING.LIB    include  loader	 po	   tools
AUTHORS     dlls	   libs     MAINTAINERS  programs  VERSION
configure   documentation  LICENSE  Makefile.in  README

Wine uses a virtual C: drive and you need to configure it with this command:

[mythcat@desk ~]$ winecfg
wine: created the configuration directory '/home/mythcat/.wine'
002c:fixme:winediag:LdrInitializeThunk wine-staging 6.0 is a testing version containing experimental patches.
...

This starts a new window where you can set the wine software.

Also, you can locate the virtual C: drive at:

[mythcat@desk ~]$ ls -la .wine/drive_c/
total 8
drwxr-xr-x  7 mythcat mythcat  124 Jan 30 11:56  .
drwxr-xr-x  4 mythcat mythcat  117 Jan 30 12:03  ..
drwxr-xr-x  3 mythcat mythcat   23 Jan 30 11:56  ProgramData
drwxr-xr-x  6 mythcat mythcat   97 Jan 30 11:56 'Program Files'
drwxr-xr-x  6 mythcat mythcat   97 Jan 30 11:56 'Program Files (x86)'
drwxr-xr-x  4 mythcat mythcat   35 Jan 30 11:56  users
drwxr-xr-x 18 mythcat mythcat 4096 Jan 30 11:57  windows
-rw-r--r--  1 mythcat mythcat    9 Jan 30 11:56  .windows-serial

I tested with my favorite old game Dune 2000 from this webpage

Just unzip it and run wine with right-click on DUNE2000.EXE and select Open With and Wine Windows Program Loader.

The game runs it well:

You can read about Fedora Linux distro and Wine software on this official MediaWiki page.

Fedora 33 : Create a simple GUI Button on Unity 3D.

It is very useful to create applications in the Fedora 33 Linux distribution with the Unity 3D game engine.

In today's tutorial, I will show you how to build the simplest GUI with C# and a dynamic button.

To create a button dynamically you need to use GUI.Button.

Open Unity 3D new project in your Fedora 33 distro.

Add a new Game Object by right click and select Create Empty.

Select Game Object use Add Component to add a New script and name it create_button.

Open it and add this source code:

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
 
public class create_button : MonoBehaviour {
   
    
    void OnGUI() 
        {    
            if (GUI.Button(new Rect(10, 10, 300, 20), "Test - Dynamically button")) 
            {    
                Debug.Log("Test button");
            }
            
        }
}

If you run the Unity project you will see a basic Unity 3D button, see the next image:

Fedora 33 : Using the finch chat program.

Finch is a TUI (text user interface) IM client for Linux which uses libpurple.

This is very useful when you want to chat and don't have an environment to install Fedora on.

Finch is built using the ncurses toolkit, which is a library designed especially to built text user interfaces.

This program lets you sign on to Jabber, GoogleTalk, IRC, and other IM networks. 

After this was built the Pidgin application.

Let's install it with the DNF tool:

[root@desk mythcat]# dnf install finch.x86_64
...
Installed:
  finch-2.14.1-2.fc33.x86_64                             libgnt-2.14.0-3.fc33.x86_64                            

Complete!

You can find all information using the man command:

[mythcat@desk ~]$ man finch 

You can run it easy with this command:

[mythcat@desk ~]$ finch

After that, you can see the windows form for your account.

You can see one example with my IRC account:

If not you can select it by pressing the keys: Alt+A and select Accounts.

Use the Tab key and select Modify.

The new window form lets you set your account.

In the next image, you can see some settings for my IRC account.

Another important element is that this interface can be customized using the file named .gntrc.

Open it with your editor, I used vi editor:

[mythcat@desk ~]$ vi ~/.gntrc

I make these changes to use the mouse:

[general]
mouse = 1

Although the manual page says the mouse support is still experimental.

I install the GPM - a cut and paste utility and mouse server for virtual consoles.

[root@desk mythcat]# dnf install gpm.x86_64 
...
[root@desk mythcat]# systemctl status gpm
● gpm.service - Console Mouse manager
     Loaded: loaded (/usr/lib/systemd/system/gpm.service; enabled; vendor prese>
     Active: inactive (dead)
...
[root@desk mythcat]# systemctl enable gpm 
[root@desk mythcat]# systemctl status gpm 
● gpm.service - Console Mouse manager
     Loaded: loaded (/usr/lib/systemd/system/gpm.service; enabled; vendor prese>
     Active: inactive (dead) since Fri 2021-01-15 15:35:56 EET; 6min ago
   Main PID: 15241 (code=exited, status=0/SUCCESS)
        CPU: 2ms

Jan 15 15:35:32 desk systemd[1]: Starting Console Mouse manager...
Jan 15 15:35:32 desk /usr/sbin/gpm[15314]: O0o.oops(): [daemon/check_uniqueness>
Jan 15 15:35:32 desk systemd[1]: Started Console Mouse manager.
Jan 15 15:35:32 desk /usr/sbin/gpm[15314]: gpm is already running as pid 15241

The GPM can be configureted to set your mouse settings.

I restart my Fedora 33 Linux distro and works very well with the mouse.

Fedora 33 : Fixes and changes for wordpress - part 001.

If you have the latest version of WordPress installed, then you may encounter this error when trying to add a new page or post.

Publishing failed. The response is not a valid JSON response.

The problem is with how to edit posts.
One solution would be to install this plugin.
The process of installing the new WordPress or making changes does not allow you to add new plugins to the Plugins menu.
Download the Classic Editor plugin to unzip and then copy it to the plugins folder.

[root@desk mythcat]# cp -r -f /home/mythcat/classic-editor/ /usr/share/wordpress/wp-content/plugins/

Activate this plugin and now you can create and edit pages and posts in WordPress.

Fedora 33 : Use Visual Code on root account.

Sometimes creating or modifying files that have root permissions is required.
I use the following command to run Visual Code with these permissions:

sudo code --user-data-dir="~/.vscode-root"

Fedora 33 : Install wordpress on Fedora distro.

For those who are celebrating the winter holidays with the Linux operating system, I have created this little tutorial...
The first step - update and upgrade the Fedora 33 Linux distro.

[root@desk mythcat]# dnf update
...
Nothing to do.
Complete!
[root@desk mythcat]# dnf upgrade
...
Nothing to do.
Complete!

Install all packages for WordPress package:

[root@desk mythcat]# dnf install @"Web Server" php-mysqlnd mariadb-server
Last metadata expiration check: 1:10:28 ago on Thu 24 Dec 2020 12:59:20 PM EET.
Package php-mysqlnd-7.4.13-1.fc33.x86_64 is already installed.
No match for group package "powerpc-utils"
No match for group package "lsvpd"
Dependencies resolved.
...
Complete!

Finds the packages providing for WordPress.

[root@desk mythcat]# dnf provides wordpress
Last metadata expiration check: 1:13:24 ago on Thu 24 Dec 2020 12:59:20 PM EET.
wordpress-5.5.1-1.fc33.noarch : Blog tool and publishing platform
Repo        : fedora
Matched from:
Provide    : wordpress = 5.5.1-1.fc33

wordpress-5.6-1.fc33.noarch : Blog tool and publishing platform
Repo        : updates
Matched from:
Provide    : wordpress = 5.6-1.fc33

Install WordPress with DNF tool:

[root@desk mythcat]# dnf install wordpress
...
  Verifying        : php-simplepie-1.5.4-3.fc33.noarch                      7/7 

Installed:
  libc-client-2007f-26.fc33.x86_64      php-IDNA_Convert-0.8.0-14.fc33.noarch   
  php-getid3-1:1.9.20-2.fc33.noarch     php-imap-7.4.13-1.fc33.x86_64           
  php-phpmailer6-6.1.8-1.fc33.noarch    php-simplepie-1.5.4-3.fc33.noarch       
  wordpress-5.6-1.fc33.noarch          

Complete!

Allow firewall in case it is running on your system.

[root@desk mythcat]# firewall-cmd --add-port=80/tcp --permanent
success
[root@desk mythcat]# firewall-cmd --reload
success

If SELinux is running, run the commands to allow database and sendmail:

[root@desk mythcat]# setsebool -P httpd_can_network_connect_db=1
[root@desk mythcat]# setsebool -P httpd_can_sendmail=1

Enable systemctl services for WordPress:

[root@desk mythcat]# systemctl start httpd
...
[root@desk mythcat]# systemctl enable httpd
...
[root@desk mythcat]# systemctl enable mariadb
...
[root@desk mythcat]# systemctl start mariadb
...

Set up the MySQL service for WordPress:

[root@desk mythcat]# mysql_secure_installation

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current
password for the root user. If you've just installed MariaDB, and
haven't set the root password yet, you should just press enter here.

Enter current password for root (enter for none): 
OK, successfully used password, moving on...

Setting the root password or using the unix_socket ensures that nobody
can log into the MariaDB root user without the proper authorisation.

You already have your root account protected, so you can safely answer 'n'.

Switch to unix_socket authentication [Y/n] n
 ... skipping.

You already have your root account protected, so you can safely answer 'n'.

Change the root password? [Y/n] n
 ... skipping.

By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] Y
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] Y
 ... Success!

By default, MariaDB comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] Y
 - Dropping test database...
 ... Success!
 - Removing privileges on test database...
 ... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] Y
 ... Success!

Cleaning up...

All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.

Thanks for using MariaDB!

Create a database named mysite for WordPress:

[root@desk mythcat]# mysqladmin create mysite -u root -p 
Enter password: 
[root@desk mythcat]# mysql -u root -p 
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 25
Server version: 10.4.17-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> SHOW DATABASES;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysite             |
| mysql              |
| performance_schema |
+--------------------+
4 rows in set (0.000 sec)

MariaDB [(none)]> grant all privileges on mysite.* to testadmin@localhost identified by 'TESTtest!';
Query OK, 0 rows affected (0.019 sec)

MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.001 sec)

MariaDB [(none)]> quit;
Bye

Set WordPress default configuration file named wp-config.php:

[root@desk mythcat]# vim /etc/wordpress/wp-config.php

This source code show you to set wp-config.php for localhost install:

define( 'DB_NAME', 'mysite' );

/** MySQL database username */
define( 'DB_USER', 'testadmin' );

/** MySQL database password */
define( 'DB_PASSWORD', 'TESTtest!' );

/** MySQL hostname */
define( 'DB_HOST', 'localhost' );

Restart the httpd service:

[root@desk mythcat]# systemctl restart httpd

Open URL to set WordPress to set the last steps of this install process:

http://localhost/wordpress/ 

Fedora 33 : Sigil software.

Sigil is a ePub editor for Linux and omes with powerful features like UTF-16, EPUB 2 spec, and limited EPUB 3 support.
The complete control over directly editing EPUB syntax in Code View and Table of Contents generator with multi-level heading support and metadata editor.
The user interface translated into many languages and spell checking and many plugins available.
These command will show you how can search and install this software:

[root@desk mythcat]# dnf search Sigil
Last metadata expiration check: 0:54:58 ago on Wed 16 Dec 2020 11:01:54 PM EET.
======================== Name & Summary Matched: Sigil =========================
FlightCrew-sigil-plugin.x86_64 : Sigil FlightCrew epub validator plugin
sigil-doc.noarch : Documentation for Sigil ebook editor
============================= Name Matched: Sigil ==============================
sigil.x86_64 : WYSIWYG ebook editor
[root@desk mythcat]# dnf install sigil.x86_64 
Last metadata expiration check: 0:55:32 ago on Wed 16 Dec 2020 11:01:54 PM EET.
Dependencies resolved.
================================================================================
 Package                     Arch       Version               Repository   Size
================================================================================
Installing:
 sigil                       x86_64     0.9.14-7.fc33         fedora      3.5 M
Installing dependencies:
 minizip                     x86_64     2.10.2-1.fc33         updates     112 k
 python3-cssselect           noarch     0.9.2-16.fc33         fedora       38 k
 python3-cssutils            noarch     1.0.2-9.fc33          fedora      270 k
 python3-regex               x86_64     2020.11.13-1.fc33     updates     345 k
 zipios++                    x86_64     0.1.5.9-25.fc33       fedora       78 k
Installing weak dependencies:
 FlightCrew-sigil-plugin     x86_64     0.9.1-21.fc33         fedora      336 k

Transaction Summary
================================================================================
Install  7 Packages

Total download size: 4.7 M
Installed size: 20 M
Is this ok [y/N]: y
...
  Running scriptlet: sigil-0.9.14-7.fc33.x86_64                             7/7 
  Verifying        : minizip-2.10.2-1.fc33.x86_64                           1/7 
  Verifying        : python3-regex-2020.11.13-1.fc33.x86_64                 2/7 
  Verifying        : FlightCrew-sigil-plugin-0.9.1-21.fc33.x86_64           3/7 
  Verifying        : python3-cssselect-0.9.2-16.fc33.noarch                 4/7 
  Verifying        : python3-cssutils-1.0.2-9.fc33.noarch                   5/7 
  Verifying        : sigil-0.9.14-7.fc33.x86_64                             6/7 
  Verifying        : zipios++-0.1.5.9-25.fc33.x86_64                        7/7 

Installed:
  FlightCrew-sigil-plugin-0.9.1-21.fc33.x86_64                                  
  minizip-2.10.2-1.fc33.x86_64                                                  
  python3-cssselect-0.9.2-16.fc33.noarch                                        
  python3-cssutils-1.0.2-9.fc33.noarch                                          
  python3-regex-2020.11.13-1.fc33.x86_64                                        
  sigil-0.9.14-7.fc33.x86_64                                                    
  zipios++-0.1.5.9-25.fc33.x86_64                                               

Complete!

Fedora 33 : Create a simple AvaloniaUI window.

This tutorial is about Avalonia UI.

Avalonia is a cross-platform XAML-based UI framework providing a flexible styling system and supporting a wide range of Operating Systems such as Windows via .NET Framework and .NET Core, Linux via Xorg, macOS.

I install avalonia dotnet templates from here:

[mythcat@desk CSharpProjects]$ git clone https://github.com/AvaloniaUI/avalonia-dotnet-templates --recursive
Cloning into 'avalonia-dotnet-templates'...
remote: Enumerating objects: 37, done.
remote: Counting objects: 100% (37/37), done.
remote: Compressing objects: 100% (28/28), done.
remote: Total 379 (delta 14), reused 19 (delta 7), pack-reused 342
Receiving objects: 100% (379/379), 147.23 KiB | 881.00 KiB/s, done.
Resolving deltas: 100% (202/202), done.
[mythcat@desk CSharpProjects]$ ls
aspnetapp  avalonia-dotnet-templates  HelloWorld  myapp001  MyGame001  Todo
[mythcat@desk CSharpProjects]$ dotnet new --install avalonia-dotnet-templates 
...

Create a default window example with AvaloniaUI:

[mythcat@desk CSharpProjects]$ dotnet new avalonia.app -o MyAppAvalonia
The template "Avalonia .NET Core App" was created successfully.
[mythcat@desk CSharpProjects]$ cd MyAppAvalonia/
[mythcat@desk MyAppAvalonia]$ dotnet add package Avalonia
...
[mythcat@desk MyAppAvalonia]$ dotnet add package Avalonia.Desktop
...
[mythcat@desk MyAppAvalonia]$ ls
App.xaml  App.xaml.cs  MainWindow.xaml  MainWindow.xaml.cs  MyAppAvalonia.csproj  nuget.config  Program.cs

Publish this example:

[mythcat@desk MyAppAvalonia]$ dotnet publish --configuration Release --runtime fedora.33-x64 --self-contained false
Microsoft (R) Build Engine version 16.4.0+e901037fe for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

Restore completed in 3.86 sec for /home/mythcat/CSharpProjects/MyAppAvalonia/MyAppAvalonia.csproj.
MyAppAvalonia -> /home/mythcat/CSharpProjects/MyAppAvalonia/bin/Release/netcoreapp3.0/fedora.33-x64/MyAppAvalonia.dll
MyAppAvalonia -> /home/mythcat/CSharpProjects/MyAppAvalonia/bin/Release/netcoreapp3.0/fedora.33-x64/publish/

The last step is the run:

[mythcat@desk MyAppAvalonia]$ dotnet /home/mythcat/CSharpProjects/MyAppAvalonia/bin/Release/netcoreapp3.0/
fedora.33-x64/publish/MyAppAvalonia.dll 

This will open a window build with AvaloniaUI.

Fedora 33 : Build and publish with .NET Core SDK .

In this tutorial I will show you how can use .NET Core SDK to build and run a simple MyGame001 application from the last tutorial.
Let's go to the project and get some infos:

[mythcat@desk ~]$ cd CSharpProjects/
[mythcat@desk CSharpProjects]$ cd MyGame001/
[mythcat@desk MyGame001]$ dotnet --info
.NET Core SDK (reflecting any global.json):
 Version:   3.1.109
 Commit:    32ced2d411

Runtime Environment:
 OS Name:     fedora
 OS Version:  33
 OS Platform: Linux
 RID:         fedora.33-x64
 Base Path:   /usr/lib64/dotnet/sdk/3.1.109/

Host (useful for support):
  Version: 3.1.9
  Commit:  774fc3d6a9

.NET Core SDKs installed:
  3.1.109 [/usr/lib64/dotnet/sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.App 3.1.9 [/usr/lib64/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 3.1.9 [/usr/lib64/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download

The next command will create MyGame001.dll.

[mythcat@desk MyGame001]$ dotnet publish --configuration Release --runtime fedora.33-x64 --self-contained false
Microsoft (R) Build Engine version 16.4.0+e901037fe for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  Restore completed in 50.58 ms for /home/mythcat/CSharpProjects/MyGame001/MyGame001.csproj.
  MyGame001 -> /home/mythcat/CSharpProjects/MyGame001/bin/Release/netcoreapp3.1/fedora.33-x64/MyGame001.dll
  MyGame001 -> /home/mythcat/CSharpProjects/MyGame001/bin/Release/netcoreapp3.1/fedora.33-x64/publish/

Now you can run it with dotnet command:

[mythcat@desk MyGame001]$ dotnet /home/mythcat/CSharpProjects/MyGame001/bin/Release/netcoreapp3.1/fedora.33-x64/MyGame001.dll

You can simply run it like an Linux application:

[mythcat@desk MyGame001]$ /home/mythcat/CSharpProjects/MyGame001/bin/Release/netcoreapp3.1/fedora.33-x64/publish/MyGame001 

Fedora 33 : Testing xdotool linux tool .

Xdotool is a free and open source command line tool for simulating mouse clicks and keystrokes.
You can create beautiful scrips and tools with this command.
The help for this command is this:

[mythcat@desk ~]$ xdotool -help

Let's see some examples:
This simulate a keystroke for key c:

m[mythcat@desk ~]$ xdotool key c
c[mythcat@desk ~]$ c

The next command will simulate a key press for key c:

[mythcat@desk ~]$ xdotool keydown c
c[mythcat@desk ~]$ cccccccccccccccccccccccccccccccccccccccccccccccccccc^C
[mythcat@desk ~]$ ^C

The next command will simulate a key release for key c:

[mythcat@desk ~]$ xdotool keyup c

Use the enter key:

[mythcat@desk ~]$ xdotool key KP_Enter

[mythcat@desk ~]$

The next command will open a new tab in terminal:

[mythcat@desk ~]$ xdotool key shift+ctrl+t

This command simulate a right click at current location of pointer

xdotool click 3

The reference is: 1 – Left click, 2 – Middle click, 3 – Right click, 4 – Scroll wheel up, 5 – Scroll wheel down.
The next command get ID of terminal window currently in focus and then minimize it:

[mythcat@desk ~]$ xdotool getactivewindow windowminimize

This command lists all open windows:

[mythcat@desk ~]$ xdotool search --name ""

I get the open window with name New Tab - Google Chrome, with this command:

[mythcat@desk ~]$ xdotool search --name "New Tab -"
18874375

This command get the pid of the active window:

[mythcat@desk ~]$ xdotool getactivewindow getwindowpid
3538

The pid is from lxterminal tool:

[mythcat@desk ~]$ ps aux | grep 3538
mythcat     3538  0.3  0.4 601468 42500 ?        Sl   11:42   0:05 lxterminal
mythcat     5713  0.0  0.0 221432   780 pts/1    S+   12:07   0:00 grep 3538

The active window can be move with:

[mythcat@desk ~]$ xdotool getactivewindow windowmove 0 0

The next command get the current mouse coordinates:

[mythcat@desk ~]$ xdotool getmouselocation --shell
X=521
Y=339
SCREEN=0
WINDOW=16780805

These coordinates can be parsed:

[mythcat@desk ~]$ xdotool getmouselocation 2>/dev/null | cut -d\  -f1,2 -
x:0 y:0
[mythcat@desk ~]$ xdotool getmouselocation 2>/dev/null | sed 's/ sc.*//; s/.://g; s/ /x/'
0x0

Open inkscape and select Layer for this window Always on top:

[mythcat@desk ~]$ inkscape 

Start xdotool with focus on mouse and click on rectangle and draw area and follow the output:

[mythcat@desk ~]$ xdotool search --name "inkscape" behave %@ focus getmouselocation
x:25 y:239 screen:0 window:16786173
x:25 y:239 screen:0 window:16786173
x:340 y:378 screen:0 window:16786173
x:340 y:378 screen:0 window:16786173
x:332 y:358 screen:0 window:16786173
x:332 y:358 screen:0 window:16786173
x:518 y:643 screen:0 window:16786173
x:518 y:643 screen:0 window:16786173
x:723 y:466 screen:0 window:16780805

I create a bash script named inkscape_xdotool.sh and I add these commands:

#! /bin/sh
sleep 1
inkscape > /dev/null 2>&1 &
sleep 3
my_app=xdotool search --sync --name 'inkscape'
xdotool windowactivate $my_app
xdotool mousemove 0 0
xdotool mousemove 25 239
xdotool click 1
xdotool mousemove 332 358 mousedown 1 mousemove 518 643
xdotool mouseup 1
sleep 1
exit

I run the script:

[mythcat@desk ~]$ ./inkscape_xdotool.sh 

The script run well.
The output is an rectangle in inkscape with the default black color.

Fedora 33 : Install and test with MonoGame .NET library .

MonoGame is a simple and powerful .NET library for creating games for desktop PCs, video game consoles, and mobile devices.
Today I tested with Fedora 33.
First let's install this templates for .NET Core CLI and the Rider IDE.:

[mythcat@desk ~]$ dotnet new --install MonoGame.Templates.CSharp

Welcome to .NET Core 3.1!
---------------------
SDK Version: 3.1.109

----------------
Explore documentation: https://aka.ms/dotnet-docs
Report issues and find source on GitHub: https://github.com/dotnet/core
Find out what's new: https://aka.ms/dotnet-whats-new
Learn about the installed HTTPS developer cert: https://aka.ms/aspnet-core-https
Use 'dotnet --help' to see available commands or visit: https://aka.ms/dotnet-cli-docs
Write your first app: https://aka.ms/first-net-core-app
--------------------------------------------------------------------------------------
Getting ready...
  Restore completed in 2.76 sec for /home/mythcat/.templateengine/dotnetcli/v3.1.109/scratch/restore.csproj.
...

Install MGCB Editor is a tool for editing .mgcb files:

[mythcat@desk ~]$ dotnet tool install --global dotnet-mgcb-editor
You can invoke the tool using the following command: mgcb-editor
Tool 'dotnet-mgcb-editor' (version '3.8.0.1641') was successfully installed.
[mythcat@desk ~]$ mgcb-editor --register
Installing icon...
Installation complete!
Installing mimetype...
gtk-update-icon-cache: No theme index file.
Installation complete!
Installing application...
Installation complete!

Registered MGCB Editor!

Install C# extension for code editor:

[mythcat@desk ~]$ code --install-extension ms-dotnettools.csharp
Installing extensions...
Extension 'ms-dotnettools.csharp' is already installed.

The next step is to create new MonoGame projects:

[mythcat@desk ~]$ cd CSharpProjects/
[mythcat@desk CSharpProjects]$ dotnet new mgdesktopgl -o MyGame001
The template "MonoGame Cross-Platform Desktop Application (OpenGL)" was created successfully.

An update for template pack MonoGame.Templates.CSharp::3.8.0.1641 is available.
    install command: dotnet new -i MonoGame.Templates.CSharp::3.8.0.1641 

I run the default template and working well:

[mythcat@desk CSharpProjects]$ cd MyGame001
[mythcat@desk MyGame001]$ ls
app.manifest  Content  Game1.cs  Icon.bmp  Icon.ico  MyGame001.csproj  Program.cs
[mythcat@desk MyGame001]$ dotnet run Program.cs 

The default source code from Program.cs file is this:

using System;

namespace MyGame001
{
    public static class Program
    {
        [STAThread]
        static void Main()
        {
            using (var game = new Game1())
                game.Run();
        }
    }
} 

Fedora 33 : Smokeping tool.

Smokeping is a latency measurement tool. It sends test packets out to the net and measures the amount of time they need to travel from one place to the other and back. SmokePing consists of a daemon process which organized the latency measurements and a CGI which presents the graphs. 

You can install it like a webpage, see a demo on this webpage with Customers.SALAG.

[root@desk mythcat]# dnf search SmokePing
Last metadata expiration check: 0:12:18 ago on Tue 17 Nov 2020 08:45:57 PM EET.
=============================== Name Matched: SmokePing ===============================
smokeping.noarch : Latency Logging and Graphing System
[root@desk mythcat]# dnf install smokeping.noarch
Last metadata expiration check: 0:12:24 ago on Tue 17 Nov 2020 08:45:57 PM EET.
Dependencies resolved.
=======================================================================================
 Package                    Architecture  Version                  Repository     Size
=======================================================================================
Installing:
 smokeping                  noarch        2.7.3-2.fc33             fedora        564 k
Installing dependencies:
 fedora-logos-httpd         noarch        30.0.2-5.fc33            fedora         15 k
 fping                      x86_64        5.0-1.fc33               fedora         38 k
 httpd                      x86_64        2.4.46-1.fc33            fedora        1.4 M
 httpd-filesystem           noarch        2.4.46-1.fc33            fedora         14 k
 httpd-tools                x86_64        2.4.46-1.fc33            fedora         83 k
 libdbi                     x86_64        0.9.0-16.fc33            fedora         50 k
 mod_fcgid                  x86_64        2.3.9-21.fc33            fedora         77 k
 mod_http2                  x86_64        1.15.14-2.fc33           fedora        152 k
 perl-CGI                   noarch        4.50-4.fc33              fedora        198 k
 perl-CGI-Fast              noarch        2.15-6.fc33              fedora         18 k
 perl-Config-Grammar        noarch        1.13-6.fc33              fedora         29 k
 perl-FCGI                  x86_64        1:0.79-5.fc33            fedora         47 k
 perl-Net-DNS               noarch        1.21-5.fc33              fedora        356 k
 perl-Net-Telnet            noarch        3.04-15.fc33             fedora         62 k
 perl-Path-Tiny             noarch        0.114-3.fc33             fedora         67 k
 perl-SNMP_Session          noarch        1.13-25.fc33             fedora         67 k
 perl-Unicode-UTF8          x86_64        0.62-13.fc33             fedora         26 k
 rrdtool                    x86_64        1.7.2-14.fc33            fedora        569 k
 rrdtool-perl               x86_64        1.7.2-14.fc33            fedora         43 k

Transaction Summary
=======================================================================================
Install  20 Packages

Total download size: 3.8 M
Installed size: 11 M
Is this ok [y/N]: y
Downloading Packages:
...
Complete!
[root@desk mythcat]# dnf install lighttpd
...
Complete!

[root@desk mythcat]# dnf install lighttpd-fastcgi
...
Complete!

Most users use the smokeping service:

sudo service smokeping start
sudo service smokeping status

You can set your configuration file using this file:

[mythcat@desk ~]$ sudo vi /etc/smokeping/config

I let this file unchanged and I run these commands:

[mythcat@desk ~]$ sudo smokeping --check
Configuration file '/etc/smokeping/config' syntax OK.
[mythcat@desk ~]$ sudo smokeping --debug
### Compiling alert detector pattern 'someloss'
### >0%,*12*,>0%,*12*,>0%
...
Smokeping version 2.007003 successfully launched.
Not entering multiprocess mode with '--debug'. Use '--debug-daemon' for that.
FPing: probing 3 targets with step 300 s and offset 118 s.
FPing: Executing /usr/sbin/fping -C 20 -q -B1 -r1 -4 -i10 planet.fedoraproject.org fedoraproject.org 
docs.fedoraproject.org
FPing: Got fping output: 'planet.fedoraproject.org : 165 166 167 167 165 172 165 165 165 164 168 165 166 165
165 164 165 164 171 165'
FPing: Got fping output: 'fedoraproject.org        : 77.8 75.6 75.0 68.3 69.1 73.6 71.1 71.1 69.0 67.5
69.9 69.5 70.6 70.8 76.9 76.0 70.8 70.6 72.1 68.3'
FPing: Got fping output: 'docs.fedoraproject.org   : 171 165 165 165 180 164 170 164 164 165 163 171 
169 160 170 167 166 166 166 164'
Calling RRDs::update(/var/lib/smokeping/rrd/Ping/FedoraprojectOrg.rrd --template uptime:loss:median:
ping1:ping2:ping3:ping4:ping5:ping6:ping7:ping8:ping9:ping10:ping11:ping12:ping13:ping14:ping15:
ping16:ping17:ping18:ping19:ping20 1605642550:U:0:7.0800000000e-02:6.7500000000e-02:
...
1.6700000000e-01:1.6800000000e-01:1.7100000000e-01:1.7200000000e-01)

Fedora 33 : Install PyGame 2.0 on Fedora.

Today I will show you how to install the python PyGame version 2.0 package with python version 3.9 in Fedora 33 distro. Let's install all Fedora packages need for this python package:

[root@desk pygame]# dnf install SDL2-devel.x86_64 
...
Installed:
  SDL2-devel-2.0.12-4.fc33.x86_64                                               

Complete!
[root@desk pygame]# dnf install SDL2_ttf-devel.x86_64
...
Installed:
  SDL2_ttf-2.0.15-6.fc33.x86_64       SDL2_ttf-devel-2.0.15-6.fc33.x86_64      

Complete!
[root@desk pygame]# dnf install SDL2_image-devel.x86_64
...
Installed:
  SDL2_image-2.0.5-5.fc33.x86_64      SDL2_image-devel-2.0.5-5.fc33.x86_64     

Complete!
[root@desk pygame]# dnf install SDL2_mixer-devel.x86_64 
...
Installed:
  SDL2_mixer-2.0.4-7.fc33.x86_64      SDL2_mixer-devel-2.0.4-7.fc33.x86_64     

Complete!
[root@desk pygame]# dnf install SDL2_gfx-devel.x86_64 
...
Installed:
  SDL2_gfx-1.0.4-3.fc33.x86_64        SDL2_gfx-devel-1.0.4-3.fc33.x86_64       

Complete!
[root@desk pygame]# dnf install portmidi-devel.x86_64 
...
Installed:
  portmidi-devel-217-38.fc33.x86_64                                             

Complete!

Use this command to clone it from GitHub and install it:

[mythcat@desk ~]$ git clone https://github.com/pygame/pygame
Cloning into 'pygame'...
remote: Enumerating objects: 4, done.
remote: Counting objects: 100% (4/4), done.
remote: Compressing objects: 100% (4/4), done.
remote: Total 38509 (delta 0), reused 0 (delta 0), pack-reused 38505
Receiving objects: 100% (38509/38509), 17.78 MiB | 11.66 MiB/s, done.
Resolving deltas: 100% (29718/29718), done.
[mythcat@desk ~]$ cd pygame/
[mythcat@desk pygame]$ python3.9 setup.py install --user


WARNING, No "Setup" File Exists, Running "buildconfig/config.py"
Using UNIX configuration...


Hunting dependencies...
SDL     : found 2.0.12
FONT    : found
IMAGE   : found
MIXER   : found
PNG     : found
JPEG    : found
SCRAP   : found
PORTMIDI: found
PORTTIME: found
FREETYPE: found 23.4.17

If you get compiler errors during install, double-check
the compiler flags in the "Setup" file.
...
copying docs/pygame_tiny.gif -> build/bdist.linux-x86_64/egg/pygame/docs
creating build/bdist.linux-x86_64/egg/EGG-INFO
copying pygame.egg-info/PKG-INFO -> build/bdist.linux-x86_64/egg/EGG-INFO
copying pygame.egg-info/SOURCES.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
copying pygame.egg-info/dependency_links.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
copying pygame.egg-info/entry_points.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
copying pygame.egg-info/not-zip-safe -> build/bdist.linux-x86_64/egg/EGG-INFO
copying pygame.egg-info/top_level.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
writing build/bdist.linux-x86_64/egg/EGG-INFO/native_libs.txt
creating dist
creating 'dist/pygame-2.0.1.dev1-py3.9-linux-x86_64.egg' and adding 'build/bdist.linux-x86_64/egg' to it
removing 'build/bdist.linux-x86_64/egg' (and everything under it)
Processing pygame-2.0.1.dev1-py3.9-linux-x86_64.egg
creating /home/mythcat/.local/lib/python3.9/site-packages/pygame-2.0.1.dev1-py3.9-linux-x86_64.egg
Extracting pygame-2.0.1.dev1-py3.9-linux-x86_64.egg to /home/mythcat/.local/lib/python3.9/site-packages
Adding pygame 2.0.1.dev1 to easy-install.pth file

Installed /home/mythcat/.local/lib/python3.9/site-packages/pygame-2.0.1.dev1-py3.9-linux-x86_64.egg
Processing dependencies for pygame==2.0.1.dev1
Finished processing dependencies for pygame==2.0.1.dev1

Let's test it:

[mythcat@desk pygame]$ ls
build	     dist  examples	    README.rst	setup.cfg  src_c   test
buildconfig  docs  pygame.egg-info  Setup	setup.py   src_py
[mythcat@desk pygame]$ python3.9
Python 3.9.0 (default, Oct  6 2020, 00:00:00) 
[GCC 10.2.1 20200826 (Red Hat 10.2.1-3)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pygame
pygame 2.0.1.dev1 (SDL 2.0.12, python 3.9.0)
Hello from the pygame community. https://www.pygame.org/contribute.html
>>> 

Fedora 33 : Upgrade from Fedora 32.

It is recommended to put SElinux in the disabled ... Use the following commands for this operation Edit the /etc/selinux/config file, run:

sudo vi /etc/selinux/config

Set SELINUX to disabled:

SELINUX=disabled

These commands will prepare the Fedora 32 for update

[root@desk mythcat]# dnf config-manager --set-disabled "*"
[root@desk mythcat]# dnf repolist 
[root@desk mythcat]# dnf config-manager --set-enabled updates
[root@desk mythcat]# dnf repolist 
repo id                                       repo name
fedora                                        Fedora 32 - x86_64
updates                                       Fedora 32 - x86_64 - Updates
[root@desk mythcat]# dnf upgrade --refresh
...
[root@desk mythcat]# dnf install dnf-plugin-system-upgrade
...

Let's upgrade with new Fedora 33 packages:

[root@desk mythcat]# dnf system-upgrade download --releasever=33 --allowerasing
Before you continue ensure that your system is fully upgraded by running "dnf --refresh upgrade". 
Do you want to continue [y/N]: y
...
  file /usr/bin/ocamlprof.byte conflicts between attempted installs of ocaml-4.11.1-1.fc33.i686 
  and ocaml-4.11.1-1.fc33.x86_64
...
[root@desk mythcat]# dnf remove ocaml
...

I try again to update:

[root@desk mythcat]# dnf system-upgrade download --releasever=33 --allowerasing
...
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Complete!
Download complete! Use 'dnf system-upgrade reboot' to start the upgrade.
To remove cached metadata and transaction use 'dnf system-upgrade clean'
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'dnf clean packages'.

[root@desk mythcat]# dnf system-upgrade reboot

After reboot and system upgrade the new Fedora 33 is ready to use.
If exist another upgrade then use dnf tool command:

[sudo] password for mythcat: 
[root@desk mythcat]# dnf upgrade
Last metadata expiration check: 1:58:19 ago on Sat 31 Oct 2020 04:06:13 PM EET.
Dependencies resolved.
================================================================================
 Package                   Arch        Version               Repository    Size
================================================================================
Upgrading:
 dnf                       noarch      4.4.0-3.fc33          updates      445 k
 dnf-data                  noarch      4.4.0-3.fc33          updates       46 k
 libdnf                    x86_64      0.54.2-3.fc33         updates      604 k
 php-symfony-polyfill      noarch      1.19.0-1.fc33         updates       57 k
 python3-dnf               noarch      4.4.0-3.fc33          updates      410 k
 python3-hawkey            x86_64      0.54.2-3.fc33         updates      112 k
 python3-libdnf            x86_64      0.54.2-3.fc33         updates      775 k
 unixODBC                  x86_64      2.3.9-1.fc33          updates      460 k
 yum                       noarch      4.4.0-3.fc33          updates       43 k

Transaction Summary
================================================================================
Upgrade  9 Packages

Total download size: 2.9 M
Is this ok [y/N]: y
...
Upgraded:
  dnf-4.4.0-3.fc33.noarch             dnf-data-4.4.0-3.fc33.noarch             
  libdnf-0.54.2-3.fc33.x86_64         php-symfony-polyfill-1.19.0-1.fc33.noarch
  python3-dnf-4.4.0-3.fc33.noarch     python3-hawkey-0.54.2-3.fc33.x86_64      
  python3-libdnf-0.54.2-3.fc33.x86_64 unixODBC-2.3.9-1.fc33.x86_64             
  yum-4.4.0-3.fc33.noarch            

Complete!
[root@desk mythcat]# uname -a
Linux desk 5.8.16-300.fc33.x86_64 #1 SMP Mon Oct 19 13:18:33 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

A job very well done by Fedora team.

Fedora 32 : Can be better? part 016.

Today I tested the Unity 3D version 2020 on Linux Fedora 32.
Maybe it would be better to integrate Unity 3D or Unity Hub in Fedora repo just like other useful software like Blender 3D, GIMP.
It will improve the user experience and attract new users and developers for this distro.
I download the AppImage from Unity website and I run with these commands:

[mythcat@desk Downloads]$ chmod a+x UnityHub.AppImage 
[mythcat@desk Downloads]$ ./UnityHub.AppImage 
r: 0
License accepted
...

Fedora 32 : About positive and negative lookahead with Bash commands.

Today I will talk about something more complex in Linux commands called: positive and negative lookahead.
This solution can be found in several programming languages including Bash
The lookahead process is part of regular expressions.
The lookahead process looks ahead in the string and sees if it matches the given pattern, but then disregard it and move on.
It is very useful when we want to go through the strings.
The lookahead process can be both positive and negative depending on the purpose.
Negative lookahead is indispensable if you want to match something not followed by something else and looks like this:

q(?!s).

The string is the question q is analyzed and if it does not match and is not followed by s returns the result.
The positive lookahead it works the same way only now it is parsed if it corresponds to s.
The positive lookahead looks like this:

q(?=s)

Let's look at a simple example of detecting the PAE option for the processor.
We can use this command but we will find a lot of information ...

[root@desk mythcat]# cat /proc/cpuinfo
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 58
model name	: Intel(R) Celeron(R) CPU G1620 @ 2.70GHz
stepping	: 9
...

In some cases, the resulting information can be taken using pipe and grep but they will be increasingly fragmented.
I will use the same command cpuinfo and we will look for the pae information in the flags.
All CPU flags can be found here.
Let's prove with internal lookahead to find the pae flag.

[root@desk mythcat]# cat /proc/cpuinfo | grep -oP '(?='pae')...' 
pae
pae

This result gives me additional information, namely that there are two cores.
Do you have a question?

Fedora 32 : Visual Code and C# on Fedora distro.

Today I will show you how to use Visual Code with C#.

sudo rpm --import https://packages.microsoft.com/keys/microsoft.asc
sudo sh -c 'echo -e "[code]\nname=Visual Studio Code\nbaseurl=https://packages.microsoft.com/yumrepos/
vscode\nenabled=1\ngpgcheck=1\ngpgkey=https://packages.microsoft.com/keys/microsoft.asc" > 
/etc/yum.repos.d/vscode.repo'

Then use dnf to check and install this editor.

#dnf check-update
#dnf install code

Use Extensions button or Ctrl+Shift+X keys to open in the left side area and intall the C# extension from Microsoft by pressing the Install button, see:

Created a folder named CSharpProjects and using the linux terminal execute the following command:

[mythcat@desk CSharpProjects]$ dotnet new mvc -au None -o aspnetapp
The template "ASP.NET Core Web App (Model-View-Controller)" was created successfully.
This template contains technologies from parties other than Microsoft, 
see https://aka.ms/aspnetcore/3.1-third-party-notices for details.

Processing post-creation actions...
Running 'dotnet restore' on aspnetapp/aspnetapp.csproj...
  Restore completed in 112.76 ms for /home/mythcat/CSharpProjects/aspnetapp/aspnetapp.csproj.

Restore succeeded.

[mythcat@desk CSharpProjects]$ cd aspnetapp/
[mythcat@desk aspnetapp]$ code .

This command will open the Visual Code. At this point, in the aspnetapp folder is an ASP.NET project open in Visual Code. You can run this project with command:

[mythcat@desk aspnetapp]$ dotnet run
warn: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[35]
      No XML encryptor configured. Key {4c284989-9a5d-4ea7-89e2-a383828fd7ab} may be persisted 
      to storage in unencrypted form.
info: Microsoft.Hosting.Lifetime[0]
      Now listening on: https://localhost:5001
info: Microsoft.Hosting.Lifetime[0]
      Now listening on: http://localhost:5000
info: Microsoft.Hosting.Lifetime[0]
      Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
      Hosting environment: Development
info: Microsoft.Hosting.Lifetime[0]
      Content root path: /home/mythcat/CSharpProjects/aspnetapp

You can open the https://localhost:5001/ and see the default Welcome page from ASP.NET.

Fedora 32 : Create games with Phaser Editor 2D.

Today I install Phaser Editor 2D on Fedora 32, you can download it from the official website. I create an account and I download the archive for Linux. After unarchive I used very simple:

[mythcat@desk ~]$ cd PhaserEditor2D/
[mythcat@desk PhaserEditor2D]$ ls
editor  PhaserEditor2D  README.TXT  templates
[mythcat@desk PhaserEditor2D]$ ./PhaserEditor2D 
Phaser Editor 2D - v3.7.1

=> Running in Free mode (only 70 files per project allowed)
=> Purchase a license: https://gum.co/phasereditor

2020/10/03 16:17:51 Loading workspace at /home/mythcat/PhaserEditor2D_Projects
2020/10/03 16:17:51 Listening at http://127.0.0.1:1959/editor

Play IDE online : https://play.phasereditor2d.com/
Documentation   : https://help.phasereditor2d.com/v3
File bugs/ideas : https://github.com/PhaserEditor2D/PhaserEditor2D-v3/
Keep in contact : https://twitter.com/PhaserEditor2D

=> Open the web browser at http://127.0.0.1:1959/editor

2020/10/03 16:17:52 No updates available.

Phaser Editor 2D is a commercial IDE to develop video-games. It is delivered as an offline product and users can run it for free (with certain limitations) or can purchase a license key to unlock all features. Phaser Editor 2D version 3, the latest, is a complete new software based on web technologies. So we created Play Phaser Editor 2D, a small service to allow Phaser Editor 2D license owners, to run the editor and create small projects in the cloud. However, in the future, we will provide a different cloud service with options for storage, collaboration, publishing, integration with other services and payment. These are the Play Phaser Editor 2D available plans: Free Plan and Premium Plan About Free Plan: Running the FREE PLAN 0B/50MB of storage is used 59 days before expiration date The Premium Plan comes with these options:

• One Year License - 30$ Valid for one year after the purchase. Phaser Editor 2D Team email support. Write to developers@phasereditor2d.com. The option to refund in the first month after the purchase.
• Two Years License - 45$ Valid for two years after the purchase. Phaser Editor 2D Team email support. Write to developers@phasereditor2d.com. The option to refund in the first month after the purchase.
• Lifetime License - 75$ Never expires. Phaser Editor 2D Team email support. Write to developers@phasereditor2d.com. The option to refund in the first month after the purchase.
• Two Years Team License - 125$ 5 developers allowed. Valid for two years. Phaser Editor 2D Team email support. Write to developers@phasereditor2d.com. The option to refund in the first month after the purchase.

This is a video tutorial from official youtube channel:

Fedora 32 : Can be better? part 015.

In the evening I can spend my time with Fedora 32.

In the last few days I studied GTK # a bit.

I thought it would be useful for Linux users and those who use the language of the FASM assembler to have an editor.

Tonight I created this simple project this simple project named fasm_editor.

The objectives of this project are:

• creating a functional editor;
• implementation of running and compilation requirements;
• settings specific to the Linux operating system;

I believe that this way Fedora Linux can be improved and become better.

Fedora 32 : Can be better? part 014.

The GTK documentation for C # is not very up to date, I tried to use a button to change a label and I failed first time. The Fedora team could improve this to develop the development side. Here's what I've managed to do so far with GTK.

I fixed the source code with this, but I would have preferred a better method:

my_Button.Clicked += delegate {
my_Label.Text = "Use delegate!";
};

Mono is a free and open source implementation of the .NET Framework.

The most popular build tool for Mono is NAnt.

NUnit is very useful for test driven development.

[root@desk mythcat]# dnf install mono-devel
Last metadata expiration check: 0:15:26 ago on Wed 30 Sep 2020 09:04:30 PM EEST.
Package mono-devel-6.6.0-8.fc32.x86_64 is already installed.
Dependencies resolved.
Nothing to do.
Complete!
[root@desk mythcat]# dnf install nant
...
Installed:
  log4net-2.0.8-10.fc32.x86_64            nant-1:0.92-25.fc32.x86_64           
  nunit2-2.6.4-24.fc32.x86_64            

Complete!
[root@desk mythcat]# dnf install nunit nunit-gui
Last metadata expiration check: 0:02:09 ago on Wed 30 Sep 2020 09:27:18 PM EEST.
No match for argument: nunit-gui
Error: Unable to find a match: nunit-gui

Installing MonoDevelop:

[root@desk mythcat]# dnf install monodevelop
...
Installed:
  ORBit2-2.14.19-23.fc32.x86_64                                                 
  gamin-0.1.10-36.fc32.x86_64                                                   
  gnome-desktop-sharp-2.26.0-36.fc31.x86_64                                     
  gnome-sharp-2.24.2-25.fc32.x86_64                                             
  gnome-vfs2-2.24.4-30.fc32.x86_64                                              
  gnome-vfs2-common-2.24.4-30.fc32.noarch                                       
  gtk-sharp2-2.12.45-11.fc32.x86_64                                             
  gtk-sharp2-devel-2.12.45-11.fc32.x86_64                                       
  gtksourceview2-2.11.2-31.fc32.x86_64                                          
  libIDL-0.8.14-21.fc32.x86_64                                                  
  libbonobo-2.32.1-18.fc32.x86_64                                               
  libbonoboui-2.24.5-18.fc32.x86_64                                             
  libgnome-2.32.1-20.fc32.x86_64                                                
  libgnome-keyring-3.12.0-19.fc32.x86_64                                        
  libgnomecanvas-2.30.3-19.fc32.x86_64                                          
  libgnomeui-2.24.5-21.fc32.x86_64                                              
  mono-addins-1.1-13.fc32.x86_64                                                
  monodevelop-5.10.0-17.fc32.x86_64                                             
  vte-0.28.2-31.fc32.x86_64                                                     

Complete!

Install the .NET Core. This is a general-purpose, modular, cross-platform and open-source development Platform.

[root@desk mythcat]# dnf copr enable @dotnet-sig/dotnet
Enabling a Copr repository. Please note that this repository is not part
of the main distribution, and quality may vary.
...
Do you really want to enable copr.fedorainfracloud.org/@dotnet-sig/dotnet? [y/N]: y
Repository successfully enabled.
[root@desk mythcat]# dnf install dotnet
Copr repo for dotnet owned by @dotnet-sig             5.4 kB/s | 3.3 kB     00:00    
Package dotnet-3.1.108-1.fc32.x86_64 is already installed.
Dependencies resolved.
Nothing to do.
Complete! 

Let's start with a GTK project using the MonoDevelop I.D.E.

[mythcat@desk ProjectsCSharp]$ monodevelop 

I use a new solution from .NET with GTK# 2.0 Project template. The default source code is this:

using System;
using Gtk;

namespace MonoDevelopGTK_001
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			Application.Init ();
			MainWindow win = new MainWindow ();
			win.Show ();
			Application.Run ();
		}
	}
}

The result is an simple window form. For a complex form with entry ,label and one button, you can see the next example:

using System;
using Gtk;

namespace MonoDevelopGTK_001
{
	
	class MainClass
	{
		public static void Main (string[] args)
		{
			// define here Entry and Button 
			Entry name;
			Button my_Button;

			Application.Init ();
			MainWindow win = new MainWindow ();
			// change the size of window
			win.SetDefaultSize (640, 480);
			// this will close application
			win.DeleteEvent += new DeleteEventHandler (Window_Delete);

			// use of VBox or HBox
			VBox global_vbox = new VBox();
			win.Add(global_vbox);
			name = new Entry();
			global_vbox.PackStart(name, false, false, 0);
			win.Add(name);

			VBox label_vbox = new VBox();
			global_vbox.Add (label_vbox);
			//Define here a label and put some text in it.
			Label my_Label = new Label();
			my_Label.Text = "Hello World!";
			label_vbox.PackStart(my_Label, false, false, 0);
			//Add the label to the form
			win.Add(my_Label);

			VBox button_vbox = new VBox();
			global_vbox.Add (button_vbox);
			my_Button = new Button("Ok!");
			my_Button.Clicked += OnButtonClicked;
			button_vbox.PackStart(my_Button, false, false, 0);
			win.Add(my_Button);
			// ShowAll is used to see all labels, buttons
			win.ShowAll();
			//win.Show ();
			Application.Run ();

		}

		public static void OnButtonClicked (object obj, EventArgs args)
		{
			//Label my_Label = obj as Gtk.Label;
			Console.WriteLine ("Button Clicked !");

		}

		static void Window_Delete (object obj, DeleteEventArgs args)
		{
			Application.Quit ();
			args.RetVal = true;
		}
	}
}

Fedora 32 : Can be better? part 013.

I would say that I always have a problem with accessing the knowledge base related to errors, errors and configurations in Linux and Fedora distro.

I think it would be very necessary to have as up-to-date documentation as possible in the Fedora distribution system and possibly a database based on questions and answers.

That makes me think of the pilots' manuals ... where all the possible problems are listed.

It would be useful for anyone and especially saves users' memory.

In the age of artificial intelligence, a flow chart for each possible problem generated by Xorg, Network, services that indicate the areas of interaction and possibly the basic checks that a user should make, possible settings depending on the problem or the desired change would be a fantastic map for both a beginner and an advanced user.

After doing some SELinux configurations, my browser did not want to access the internet.

Until the deactivation, the number of SELinux alerts increased dramatically.

The written SELinux policies were not exactly correct.

Obviously I tried to fix the problem by disabling SELinux.

The ping utility sent and received packets to the internet, my browser does not connect to it.

Sometimes a symbolic link or incorrect setting can block your internet access.

I think the problem was generated when disabling SELinux by restarting and shutting down a useful service.

ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf

Although attention was paid to the possibility of incorrect SELinux settings, a simple check and a restart of the systemd-resolved.service service solved the problem.

[root@desk mythcat]# systemctl status systemd-resolved.service 
● systemd-resolved.service - Network Name Resolution
     Loaded: loaded (/usr/lib/systemd/system/systemd-resolved.service; disabled
     Active: inactive (dead)
       Docs: man:systemd-resolved.service(8)
[root@desk mythcat]# systemctl start systemd-resolved.service 
[root@desk mythcat]# systemctl status systemd-resolved.service
● systemd-resolved.service - Network Name Resolution
     Loaded: loaded (/usr/lib/systemd/system/systemd-resolved.service; disabled
     Active: active (running) since Tue 2020-09-29 22:25:32 EEST; 8s ago

Now I've fixed it.

Fedora 32 : Can be better? part 012.

Pidgin is a chat program that lets you log in to accounts on multiple chat networks simultaneously. 

Pidgin can be installed on multiple operating systems and platforms. 

Pidgin is compatible with the following chat networks out of the box: I.R.C., Jabber/XMPP, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, Lotus Sametime, SILC, SIMPLE, and Zephyr. Can it be better? 

The only problem a user in need of help may have been in the command line environment. Obviously, in this case, this application cannot be used. I would suggest building a terminal application like WeeChat dedicated to Fedora users and including I.R.C channels. 

Now, let's install this application.

[root@desk mythcat]# dnf install pidgin.x86_64
Last metadata expiration check: 0:45:32 ago on Sun 27 Sep 2020 04:21:51 PM EEST.
Dependencies resolved.
==============================================================================================
 Package                     Architecture    Version                   Repository        Size
==============================================================================================
Installing:
 pidgin                      x86_64          2.13.0-18.fc32            updates          1.4 M
Installing dependencies:
 cyrus-sasl-md5              x86_64          2.1.27-4.fc32             fedora            41 k
 cyrus-sasl-scram            x86_64          2.1.27-4.fc32             fedora            27 k
 farstream02                 x86_64          0.2.9-1.fc32              fedora           239 k
 gtkspell                    x86_64          2.0.16-20.fc32            fedora            43 k
 libgadu                     x86_64          1.12.2-10.fc32            fedora           110 k
 libnice-gstreamer1          x86_64          0.1.17-2.fc32             updates           20 k
 libpurple                   x86_64          2.13.0-18.fc32            updates          5.2 M
 meanwhile                   x86_64          1.1.0-28.fc32             fedora           106 k

Transaction Summary
==============================================================================================
Install  9 Packages

Total download size: 7.2 M
Installed size: 31 M
Is this ok [y/N]: y
Downloading Packages:
...
Complete!

Fedora 32 : Testing the Bookworm software.

The current version of Bookworm (v1.1.2) supports eBooks in the following file formats: EPUB, PDF, MOBI, FB2, CBR, CBZ.

First, I install this software with dnf tool:

[root@desk mythcat]# dnf install bookworm.x86_64 
...
Installed:
  bookworm-1.1.3-0.1.20200414git.c7c3643.fc32.x86_64                                          

Complete!

I tested with some old EPUB and PDF files and I'm not very happy with formatting text on the page.

HI tested with some old EPUB and PDF files and I'm not very happy with the formatting for certain texts on the page, like source code in programming.

Bookworm does one thing and does it well for this simple reader.

You can help this project on GitHub.

Fedora 32 : Can be better? part 011.

Four days ago, the well-known Gnome environment came with a new release.

I guess it will be implemented in Fedora distro soon. 

Fedora 32 : Can be better? part 010.

In this tutorial I will show you how can easy learn with a simple example to have a better Fedora distro with SELinux. 

SELinux uses a policy store to keep track of its loaded policy modules and related settings. 

You can see my active policy store name is MLS.

[root@desk mythcat]# sestatus | grep Loaded
Loaded policy name:             mls

I want to create policy in the most easy way to denny memory. 

I can use many way to do that or find it on SELinux. 

If you want to deny user domains applications to map a memory region as both executable and writable you can use deny_execmem. 

This is dangerous and the executable should be reported in bugzilla and is is enabled by default. 

You must turn on the deny_execmem boolean.

setsebool -P deny_execmem 1

Let's use it:

[root@desk mythcat]# setsebool -P deny_execmem 1
[root@desk mythcat]# ausearch -c 'Web Content' --raw | audit2allow -M my-WebContent
******************** IMPORTANT ***********************
To make this policy package active, execute:

semodule -i my-WebContent.pp

[root@desk mythcat]# semodule -X 300 -i my-WebContent.pp

Let's see if this SELinux is currently loaded:

[root@desk mythcat]# semodule -l | grep Web
my-WebContent

Fedora 32 : Can be better? part 008.

The Fedora development is not very active in the last programming language.
The main reason is the build new packages and put on the repository.
I think this can be improved with a good tool to solve all dependencies and link all into a good package.
Today I tested the new Python version 3.5.10 released on September 5th, 2020.
I download an unzip the archive and I use these commands to build this python version

[mythcat@desk ~]$ cd Python-3.5.10/
[mythcat@desk Python-3.5.10]$ ./configure
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking for python3.5... no
checking for python3... python3
checking for --enable-universalsdk... no
...

The next command is make:

[mythcat@desk Python-3.5.10]$ make
gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes
   -Werror=declaration-after-statement   -I. -I./Include    -DPy_BUILD_CORE -o Programs/python.o 
./Programs/python.c
...
# On Darwin, always use the python version of the script, the shell
# version doesn't use the compiler customizations that are provided
# in python (_osx_support.py).
if test `uname -s` = Darwin; then \
 cp python-config.py python-config; \
fi

Then I used make test.

[mythcat@desk Python-3.5.10]$ make test
running build
running build_ext
INFO: Can't locate Tcl/Tk libs and/or headers

Python build finished successfully!
...

For the last part I used this command:

[mythcat@desk Python-3.5.10]$ sudo make install
...

The result of this is ...

[mythcat@desk Python-3.5.10]$ ls
aclocal.m4     config.sub    Include          Mac              Modules  platform        python            README
build          configure     install-sh       Makefile         Objects  Programs        Python            setup.py
config.guess   configure.ac  Lib              Makefile.pre     Parser   pybuilddir.txt  python-config     Tools
config.log     Doc           libpython3.5m.a  Makefile.pre.in  PC       pyconfig.h      python-config.py
config.status  Grammar       LICENSE          Misc             PCbuild  pyconfig.h.in   python-gdb.py
[mythcat@desk Python-3.5.10]$ ./python 
Python 3.5.10 (default, Sep  6 2020, 22:32:07) 
[GCC 10.2.1 20200723 (Red Hat 10.2.1-1)] on linux
Type "help", "copyright", "credits" or "license" for more information.
...

Fedora 32 : Can be better? part 009.

The Fedora distro will be better if the development team will come with useful, accurate, and up-to-date information. A very simple example is C and C ++ programming and more precisely how to build programs and packages. Let's take a simple example of creating interfaces with GTK. Let's take a simple example of creating interfaces with GTK that require knowledge of the GCC compiler. First I install gtk3-devel package:

dnf install gtk3-devel 

The Fedora team come with a group install with many feature.

#dnf -y groupinstall "Development Tools"

I test with these examples:

#include 

int main(int   argc,
     char *argv[])
{
  GtkWidget *window;
    
  gtk_init (&argc, &argv);
    
  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title (GTK_WINDOW (window), "Hello World");
  gtk_widget_show  (window);
    
  gtk_main ();
    
  return 0;
}

This create a simple window with Hello World title.

#include 

static void on_window_closed(GtkWidget * widget, gpointer data)
{
    gtk_main_quit();
}

int main(int argc, char * argv[])
{
    GtkWidget * window, * label;

    gtk_init(&argc, &argv);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

    g_signal_connect( window, "destroy", G_CALLBACK(on_window_closed), NULL);

    label = gtk_label_new("Hello, World!");

    gtk_container_add(GTK_CONTAINER(window), label);

    gtk_widget_show(label);
    gtk_widget_show(window);

    gtk_main();

    return 0;
}

This is the same example but you will see a label with te text Hello, World!.
The last example is more complex and involves the use of signals attached to the close button and the OK button.
The main window contains three labels with my name and an editbox in which you have to enter my nickname mythcat or something else.

#include 

const char *password = "mythcat";

// close the window application 
void closeApp(GtkWidget *widget, gpointer data)
{
    gtk_main_quit();
}

// show text when you click on button 
void button_clicked(GtkWidget *button, gpointer data)
{
    const char *password_text = gtk_entry_get_text(GTK_ENTRY((GtkWidget *)data));

    if(strcmp(password_text, password) == 0)
        printf("Access granted for user: \"%s\"\n",password);
    else
        printf("Access denied!\n");
 
}

int main( int argc, char *argv[])
{
    GtkWidget *window;
    GtkWidget *label1, *label2, *label3;
    GtkWidget *hbox;
    GtkWidget *vbox;
    GtkWidget *ok_button;
    GtkWidget *password_entry;

    gtk_init(&argc, &argv);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

    gtk_window_set_title(GTK_WINDOW(window), "Labels, password with one button and layout");
    gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
    gtk_window_set_default_size(GTK_WINDOW(window), 300, 200);

    g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(closeApp), NULL);

    label1 = gtk_label_new("Catalin");
    label2 = gtk_label_new("George");
    label3 = gtk_label_new("Festila");

    password_entry = gtk_entry_new();
    gtk_entry_set_visibility(GTK_ENTRY(password_entry), FALSE);
    ok_button = gtk_button_new_with_label("OK");
    g_signal_connect(G_OBJECT(ok_button), "clicked", G_CALLBACK(button_clicked),password_entry);

    hbox = gtk_box_new(FALSE, 1);
    vbox = gtk_box_new(TRUE, 2);

    gtk_box_pack_start(GTK_BOX(vbox), label1, TRUE, FALSE, 5);
    gtk_box_pack_start(GTK_BOX(vbox), label2, TRUE, FALSE, 5);
    gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, TRUE, 5);
    gtk_box_pack_start(GTK_BOX(hbox), label3, FALSE, FALSE, 5);
    gtk_box_pack_start(GTK_BOX(vbox), ok_button, FALSE, FALSE, 5);
    gtk_box_pack_start(GTK_BOX(hbox), password_entry, TRUE, FALSE, 5);
    gtk_container_add(GTK_CONTAINER(window), hbox);

    gtk_widget_show_all(window);

    gtk_main();

    return 0;
} 

The result can be seen in the following image:

I put the source code for the last example in a test.c file and compiled it like this:

[mythcat@desk ~]$ gcc test.c $(pkg-config --cflags --libs gtk+-3.0) -o test
[mythcat@desk ~]$ ./test

Fedora 32 : Can be better? part 007.

Another article in the Can be better? series that deals with a very popular feature called SELinux. Here that in this seventh part I will introduce you to the world of SELinux in my own style of simply explaining some SElinux configurations.
Let's recap some basic elements specific to SELinux.
Multi Category Security or MCS is a discretionary implementation of the mandatory Multi Level Security
MCS basically tries to use the MLS attributes: Security Levels and Security Compartments.
MCS implemented have one or more extra fields in their Security Context tuple: user_u:role_r:type_t:s0:c0.
You can see this with id -Z.
The MLS Range contains two components, the low (classification and compartments) and high (clearance).
sensitivity label build from the low component: s2 with c1, c2 ...
MCS does have 1024 categories that can be assigned to processes and files.
On an MLS system are two special labels, SystemLow(s0) and SystemHigh (s15:c0.c255).
The upper end of the MCS range is in an MCS environment s0:c0.c1023 is SystemHigh.
By default, everything in an MCS environment has access to SystemLow or s0.
You will able to access files with s0:c122 and s0:c123 categories.
The MLS translation mechanism to give a more literal meaning to the machine-like policy used in the MLS sensitivity and category declaration.
The MLS rule says: "no read up and no write down".
The MLS model is used to enforce confidentiality.
All processes that are forced to operate with Security Level.
The s0 Security Level or SystemLow level is the lower end of the Security Level Range in an MLS environment.
If you do not have the correct configurations then the SELinux setting operation for Enforcing could generate errors in the linux operation after reboot or during Linux operation.
You will need to have the root password and return for new SELinux settings.
Let's solve this issue: put SELinux into Enforce mode but give my user possibility to use command sudo su.
First, you need to see this table:

SELinux user	Description	Used for
unconfined_u	SELinux user meant for unrestricted users. Unconfined users have hardly any restrictions in a SELinux context and are meant for systems where only Internet-facing services should run confined (i.e. the targeted SELinux policy store).	All users on a targeted system
root	The SELinux user meant for the root account	The Linux root account
sysadm_u	SELinux user with direct system administrative role assigned	Linux accounts that only perform administrative tasks
staff_u	SELinux user for operators that need to run both non-administrative commands (through the staff_r role) and administrative commands (through the sysadm_r role).	Linux accounts used for both end user usage as well as administrative tasks
user_u	SELinux user for non-privileged accounts	Unprivileged Linux accounts
system_u	Special SELinux user meant for system services	Not used directly

Is need to change my user mythcat to staff_u with a good MLS Range.

[root@desk mythcat]# semanage login --modify --seuser staff_u --range s2:c100 mythcat
[root@desk mythcat]# semanage login --modify --seuser staff_u --range s0-s15:c0.c1023 mythcat
[root@desk mythcat]# semanage login -l 
[root@desk mythcat]# setenforce enforcing
[root@desk mythcat]# getenforce
Enforcing
[root@desk mythcat]# semanage login -l 
ValueError: Cannot read policy store.

After reboot need some time to load the new changes, first is the last configuration.

[mythcat@desk ~]$ semanage login -l
ValueError: SELinux policy is not managed or store cannot be accessed.
[mythcat@desk ~]$ id -Z
staff_u:staff_r:staff_t:s0-s15:c0.c1023
[mythcat@desk ~]$ sestatus 
SELinux status: enabled
SELinuxfs mount: /sys/fs/selinux
SELinux root directory: /etc/selinux
Loaded policy name: mls
Current mode: permissive
Mode from config file: permissive
Policy MLS status: enabled
Policy deny_unknown status: denied
Memory protection checking: actual (secure)
Max kernel policy version: 33

Few seconds later all is good:

[mythcat@desk ~]$ sudo su 
[sudo] password for mythcat: 
bash: /root/.bashrc: Permission denied
bash-5.0# ls
bash-5.0# sestatus 
SELinux status: enabled
SELinuxfs mount: /sys/fs/selinux
SELinux root directory: /etc/selinux
Loaded policy name: mls
Current mode: enforcing
Mode from config file: permissive
Policy MLS status: enabled
Policy deny_unknown status: denied
Memory protection checking: actual (secure)
Max kernel policy version: 33
bash-5.0# id -Z
staff_u:staff_r:staff_t:s0-s15:c0.c1023
bash-5.0# exit 
exit
[mythcat@desk ~]$ sestatus 
SELinux status: enabled
SELinuxfs mount: /sys/fs/selinux
SELinux root directory: /etc/selinux
Loaded policy name: mls
Current mode: enforcing
Mode from config file: permissive
Policy MLS status: enabled
Policy deny_unknown status: denied
Memory protection checking: actual (secure)
Max kernel policy version: 33

Everything is fine for now, this delay is the reason for using the selinux kernel settings. More information about Multi-Level Security and Multi-Category Security can be found on this webpage.

Fedora 32 : Change display manager.

The display manager is a graphical login manager which starts a session, simply asks username and password to login desktop.
On Fedora, you can choose for example GDM (Gnome Display Manager), SDDM (Simple Desktop Display Manager), LXDM (LXDE Display Manager), LightDM, KDM (KDE Display Manager), XDM (X Display Manager).
I like the old gdm display manager, is good and works great.
If you want to change it then use these commands:

[root@desk mythcat]# dnf install gdm
...
Complete!
[root@desk mythcat]# systemctl disable lightdm 
[root@desk mythcat]# systemctl enable gdm
Failed to enable unit: File /etc/systemd/system/display-manager.service already exists and is a symlink to /usr/lib/systemd/system/sddm.service.
[root@desk mythcat]# systemctl disable sddm.service 
Removed /etc/systemd/system/display-manager.service.
[root@desk mythcat]# systemctl enable gdm
Created symlink /etc/systemd/system/display-manager.service → /usr/lib/systemd/system/gdm.service.
[root@desk mythcat]# reboot

If you have problems with gdm display manager then you can read about settings here.
The configuration file can be found in this file:

[root@desk mythcat]# cat /etc/gdm/custom.conf 
# GDM configuration storage

[daemon]
# Uncomment the line below to force the login screen to use Xorg
#WaylandEnable=false
AutomaticLogin=mythcat
AutomaticLoginEnable=False
[security]

[xdmcp]

[chooser]

[debug]
# Uncomment the line below to turn on debugging
#Enable=true 

Fedora 32 : Install LibreOffice_7.0.0 .

The latest releases of LibreOffice is version 7.0.0 and is available for Fedora 32 distro from here. To install it you need to use these commands:

[root@desk mythcat]# dnf -y update
...
[mythcat@desk ~]$ cp Downloads/LibreOffice_7.0.0_Linux_x86-64_rpm.tar.gz ~
[mythcat@desk ~]$ ls LibreOffice*
LibreOffice_7.0.0_Linux_x86-64_rpm.tar.gz
[mythcat@desk ~]$ tar xvf LibreOffice_7.0.0_Linux_x86-64_rpm.tar.gz 
LibreOffice_7.0.0.3_Linux_x86-64_rpm/
LibreOffice_7.0.0.3_Linux_x86-64_rpm/RPMS/
...
[mythcat@desk ~]$ cd LibreOffice_7.0.0.3_Linux_x86-64_rpm/
[mythcat@desk LibreOffice_7.0.0.3_Linux_x86-64_rpm]$ cd RPMS/
[mythcat@desk RPMS]$ sudo dnf install *.rpm
[sudo] password for mythcat: 
Last metadata expiration check: 2:09:12 ago on Sat 22 Aug 2020 10:33:11 PM EEST.
Dependencies resolved.
================================================================================
 Package                                    Arch   Version   Repository    Size
================================================================================
Installing:
 libobasis7.0-base                          x86_64 7.0.0.3-3 @commandline 1.8 M
 libobasis7.0-calc                          x86_64 7.0.0.3-3 @commandline 9.5 M
 libobasis7.0-core                          x86_64 7.0.0.3-3 @commandline 101 M
 libobasis7.0-draw                          x86_64 7.0.0.3-3 @commandline 6.1 k
 libobasis7.0-en-US                         x86_64 7.0.0.3-3 @commandline  88 k
...
Complete!

The last step is to run this software from Fedora 32 distro desktop environment.

Fedora 32 : Repair the starting LightDM display manager.

LightDM is a cross-desktop display manager with these features:

• Cross-desktop - supports different desktop technologies.
• Supports different display technologies (X, Mir, Wayland ...).
• Lightweight - low memory usage and high performance.
• Supports guest sessions.
• Supports remote login (incoming - XDMCP, VNC, outgoing - XDMCP, pluggable).
• Comprehensive test suite. 
• Low code complexity.

To start it you need to use these commands:

[mythcat@desk ~]$ sudo systemctl get-default
[sudo] password for mythcat: 
multi-user.target
[mythcat@desk ~]$ sudo systemctl set-default graphical.target
Removed /etc/systemd/system/default.target.
Created symlink /etc/systemd/system/default.target → /usr/lib/systemd/system/graphical.target.

Restart your Fedora distro and use it.