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Thursday, September 13, 2018

Fedora 28 : LibreOffice remote connection.

I wrote a tutorial about the remote connection in LibreOffice, see this article.
The main problem with LibreOffice development is the changes.
Now the feature Open remote is not working.
The bug is officially recognized and represented, see the page.
They inform us, see comment 31:
John R Mead 2017-12-17 22:43:03 UTC Well, it still doesn't work with LibreOffice Version: 6.0.0.0.beta1 (x64); I'm not providing screenshots this time since it's identical in everyway to my previous attempts. At the end of all the copy/pasting between LibreOffice and my browser to get all the relevant permissions, when I finally make the attempt to connect, I get the same message: The specified device is invalid. 

 Current system configuration of potentially relevant software: 

 Windows 10 Professional (x64) Version 1709 (build 16299.125) 
Java 9.0.1 
Microsoft - OneDrive version 17.25.1.0 (x64) 
LibreOffice Version: 6.0.0.0.beta1 (x64)

 It's a common practice to see open-source software with bugs, most bugs are already available to users to avoid problems.
Most backup bugs are authentication and changes in development.
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Monday, September 10, 2018

Fedora 28 : The Revel framework with golang.

The development team has a very effective text:
A high productivity, full-stack web framework for the Go language.
They used this words:
Revel provides routing, parameter parsing, validation, session/flash, templating, caching, job running, a testing framework, and even internationalization. I tested it yesterday and today I will show you how effective it is.
This framework is very easy to install and use it with Fedora 28.
I could say this is like django framework with the temptation style.
Let's start with a simple example into a folder created by me and named gocode: 
[mythcat@desk ~]$ mkdir ~/gocode
[mythcat@desk ~]$ export GOPATH=~/gocode
[mythcat@desk ~]$ echo export GOPATH=$GOPATH >> ~/.bash_profile
[mythcat@desk ~]$ cd gocode/
[mythcat@desk gocode]$ go get github.com/revel/revel
[mythcat@desk gocode]$ ls
pkg  src
[mythcat@desk gocode]$ go get github.com/revel/cmd/revel
[mythcat@desk gocode]$ ls
bin  pkg  src
[mythcat@desk gocode]$ export PATH="$PATH:$GOPATH/bin"
[mythcat@desk gocode]$ revel helpDEBUG 19:24:09  revel  server.go:27: arguments by adding nil
~
~ revel! http://revel.github.io
~
usage: revel command [arguments]

The commands are:

    new         create a skeleton Revel application
    run         run a Revel application
    build       build a Revel application (e.g. for deployment)
    package     package a Revel application (e.g. for deployment)
    clean       clean a Revel application's temp files
    test        run all tests from the command-line
    version     displays the Revel Framework and Go version

Use "revel help [command]" for more information.
[mythcat@desk gocode]$ ls
bin  pkg  src
[mythcat@desk gocode]$ revel new myapp
DEBUG 19:38:50  revel  server.go:27: RegisterServerEngine: Registered engine 
~
~ revel! http://revel.github.io
~
Your application is ready:
   /home/mythcat/gocode/src/myapp

You can run it with:
   revel run myapp
[mythcat@desk gocode]$ revel run myapp
DEBUG 19:39:15  revel  server.go:27: RegisterServerEngine: Registered engine 
~
~ revel! http://revel.github.io
~
Trying to build with myapp (0x0,0x0)
DEBUG 19:39:15  revel module.go:152: Sorted keys  section=module keys=module.static 
...
Let's see the source code - in this case the default files: app.go and Index.html .
[mythcat@desk gocode]$ cd src/myapp/app/
[mythcat@desk app]$ ls
controllers  init.go  routes  tmp  views
[mythcat@desk app]$ cd controllers/
[mythcat@desk controllers]$ ls
app.go
[mythcat@desk controllers]$ cat app.go 
package controllers

import (
    "github.com/revel/revel"
)

type App struct {
    *revel.Controller
}

func (c App) Index() revel.Result {
    return c.Render()
}

[mythcat@desk App]$ cat Index.html
The cat command will show the source code of Index.html file.
Let's add a golang variable named greeting to app.go and Index.html files: 
[mythcat@desk controllers]$ cat app.go 
package controllers

import (
    "github.com/revel/revel"
)

type App struct {
    *revel.Controller
}

func (c App) Index() revel.Result {
    greeting := "Fedora and revel framework !"
    return c.Render(greeting)
}
This variable greeting will will be add into file Index.html with tag p after It works!
This is result of two screenshots from start install and after I change with the variable greeting.
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Thursday, August 9, 2018

Fedora 28 : Linux application with node.js and Electron packager.

Today I make a tutorial about how to use node.js and Electron packager to create cross-platform applications.
The tutorial show you how to create Windows, Linux and Mac OS cross-platform applications and can be found here.
This is result of running the linux application with Fedora 28:

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Thursday, August 2, 2018

Fedora 28 : Godot example with linux .

Today I tested a simple example with the game engine named Godot version 3.0.6.
It was created on a Windows 8.1 operating system and exported as a linux application.
I moved the two files to the Fedora 28 operating system. 
[mythcat@desk Godot_test_001]$ ll
total 41752
-rw-rw-r--. 1 mythcat mythcat    41092 Aug  2 18:34 Godot_test_001.pck
-rwxrwxr-x. 1 mythcat mythcat 42707653 Aug  2 18:34 Godot_test_001.x86_64
[mythcat@desk Godot_test_001]$ ./Godot_test_001.x86_64 
OpenGL ES 3.0 Renderer: Mesa DRI Intel(R) Ivybridge Desktop 
Mono: Initializing module...
The assembly mscorlib.dll was not found or could not be loaded.
It should have been installed in the `/usr/lib/mono/4.5/mscorlib.dll' directory.
The error occurred from the mono package and I fixed it with the installation using the dnf tool. 
[root@desk mythcat]# dnf install mono-core.x86_64
Last metadata expiration check: 1:22:05 ago on Thu 02 Aug 2018 05:30:05 PM EEST.
Dependencies resolved.

...
Installed:
  mono-core.x86_64 4.8.0-14.fc28                 libgdiplus.x86_64 5.6-1.fc28                     
  mono-data.x86_64 4.8.0-14.fc28                 mono-data-sqlite.x86_64 4.8.0-14.fc28            
  mono-extras.x86_64 4.8.0-14.fc28               mono-mvc.x86_64 4.8.0-14.fc28                    
  mono-wcf.x86_64 4.8.0-14.fc28                  mono-web.x86_64 4.8.0-14.fc28                    
  mono-winforms.x86_64 4.8.0-14.fc28            

Complete!
Here's the final result: 
[mythcat@desk Godot_test_001]$ ./Godot_test_001.x86_64 
OpenGL ES 3.0 Renderer: Mesa DRI Intel(R) Ivybridge Desktop 
Mono: Initializing module...
Mono: Runtime initialized
Mono: INITIALIZED
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Wednesday, August 1, 2018

Fedora 28 : Unusual arguments for the dnf command.

Today I will introduce you in this tutorial some more unusual arguments for the dnf command.

  • first is check which package provides that file;
    • [root@desk mythcat]# dnf provides /etc/httpd/conf/httpd.conf
Last metadata expiration check: 0:23:46 ago on Wed 01 Aug 2018 09:31:44 AM EEST.
httpd-2.4.34-3.fc28.x86_64 : Apache HTTP Server
Repo        : @System
Matched from:
Filename    : /etc/httpd/conf/httpd.conf

httpd-2.4.34-3.fc28.x86_64 : Apache HTTP Server
Repo        : updates
Matched from:
Filename    : /etc/httpd/conf/httpd.conf

httpd-2.4.33-2.fc28.x86_64 : Apache HTTP Server
Repo        : fedora
Matched from:
Filename    : /etc/httpd/conf/httpd.conf
  • get detailed information of a package can be viewed with the ‘info’ argument;
    • [root@desk mythcat]# dnf info httpd
Last metadata expiration check: 0:29:01 ago on Wed 01 Aug 2018 09:31:44 AM EEST.
Installed Packages
Name         : httpd
Version      : 2.4.34
Release      : 3.fc28
Arch         : x86_64
Size         : 4.2 M
Source       : httpd-2.4.34-3.fc28.src.rpm
Repo         : @System
From repo    : updates
Summary      : Apache HTTP Server
URL          : https://httpd.apache.org/
License      : ASL 2.0
Description  : The Apache HTTP Server is a powerful, efficient, and extensible
             : web server.
  • allows us to see what has happened to our Linux system over time, and even undo, redo, or roll back a transaction;
    • [root@desk mythcat]# dnf history
ID     | Command line             | Date and time    | Action(s)      | Altered
-------------------------------------------------------------------------------
   178 | upgrade                  | 2018-08-01 09:33 | Update         |   27   
   177 | upgrade                  | 2018-07-31 12:54 | Update         |   11   
   176 | upgrade                  | 2018-07-30 20:43 | Update         |    1
  • take actions will be quicker with the ‘makecache’ argument
    • [root@desk mythcat]# time dnf makecache
Last metadata expiration check: 0:34:10 ago on Wed 01 Aug 2018 09:31:44 AM EEST.
Metadata cache created.

real    0m4.529s
user    0m1.420s
sys    0m0.229s
  • list all packages that are currently installed on your Linux system;
    • [root@desk mythcat]# dnf list installed
Installed Packages
CharLS.x86_64                          1.0-16.fc28              @System         
Field3D.x86_64                         1.7.2-10.fc28            @System         
GConf2.x86_64                          3.2.6-20.fc28            @updates-testing
GeoIP.x86_64                           1.6.12-3.fc28            @fedora         
GeoIP-GeoLite-data.noarch              2018.06-1.fc28           @updates        
ImageMagick.x86_64                     1:6.9.9.38-1.fc28        @updates-testing
ImageMagick-c++.x86_64                 1:6.9.9.38-1.fc28        @updates-testing
ImageMagick-libs.x86_64                1:6.9.9.38-1.fc28        @updates-testing
LibRaw.x86_64                          0.18.13-1.fc28           @updates        
ModemManager.x86_64                    1.6.12-3.fc28            @fedora
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Monday, June 25, 2018

Fedora 28 : Using the python module sh .

Today I test another python module named sh with python version 3.6.5 and Fedora 28.
This python module named sh is a full-fledged subprocess replacement for Python 2.6 - 3.5, PyPy and PyPy3 that allows you to call any program as if it were a function.
You can read bout this python module here.
I used dnf tool to search and install the pip tool : 
[root@desk mythcat]# dnf search python3
Last metadata expiration check: 1:06:29 ago on Mon 25 Jun 2018 09:35:04 AM EEST.
======================== Name Exactly Matched: python3 =========================
...
python3.x86_64 : Interpreter of the Python programming language
Next step is the install of python programming language: 
[root@desk mythcat]# dnf install python3.x86_64 
Last metadata expiration check: 1:09:12 ago on Mon 25 Jun 2018 09:35:04 AM EEST.
Package python3-3.6.5-1.fc28.x86_64 is already installed, skipping.
Dependencies resolved.
Nothing to do.
Complete!
...
I search the pip tool and then I install it: 
[root@desk mythcat]# dnf search python3-pip
Last metadata expiration check: 1:15:18 ago on Mon 25 Jun 2018 09:35:04 AM EEST.
====================== Name Exactly Matched: python3-pip ======================
python3-pip.noarch : A tool for installing and managing Python3 packages
...
[root@desk mythcat]# dnf install python3-pip.noarch 
Last metadata expiration check: 1:16:31 ago on Mon 25 Jun 2018 09:35:04 AM EEST.
Package python3-pip-9.0.3-2.fc28.noarch is already installed, skipping.
Dependencies resolved.
Nothing to do.
Complete!
...
The install of this python module into user mode: 
[root@desk mythcat]# exit 
exit
...
[mythcat@desk ~]$ pip3.6 install --user sh
Requirement already satisfied: sh in /usr/lib/python3.6/site-packages
See next examples and tests I used : 
[mythcat@desk ~]$ python3.6
Python 3.6.5 (default, Mar 29 2018, 18:20:46) 
[GCC 8.0.1 20180317 (Red Hat 8.0.1-0.19)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sh
>>> from sh import *
Traceback (most recent call last):
  File "", line 1, in 
  File "", line 1017, in _handle_fromlist
  File "/usr/lib/python3.6/site-packages/sh.py", line 3349, in __getattr__
    return self.__env[name]
  File "/usr/lib/python3.6/site-packages/sh.py", line 3187, in __getitem__
    Please import sh or import programs individually.")
RuntimeError: Cannot import * from sh. Please import sh or import programs individually.
...
>>> print(sh.ifconfig)
/usr/sbin/ifconfig
>>> print(sh.ifconfig())
...
>>> print(sh.ls())
...
>>> print(sh.ls("-l"))
...
>>> print(sh.uptime())
 11:25:03 up  1:52,  1 user,  load average: 1.10, 1.04, 1.40
...
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Saturday, June 23, 2018

Fedora 28 : Starting develop with Flutter .

Today I started with another programming language Dart and Flutter.
The development team tell us about Flutter:
Flutter is Google's mobile UI framework for crafting high-quality native interfaces on iOS and Android in record time. Flutter works with existing code, is used by developers and organizations around the world, and is free and open source.
You can read more about this on official webpage:
About linux setup you can read here.
You need also to download the Android Studio I.D.E from official webpage.
You need to install some packages using dnf tool:
[mythcat@desk ~]# dnf install libstdc++.i686
[mythcat@desk ~]#  dnf install curl
Unzip theAndroid Studio I.D.E.into android-studio folder and start it to make settings for android SDK and AVD emulated device:
[mythcat@desk ~]$ cd android-studio/
[mythcat@desk android-studio]$ ls 
bin        gradle                 jre  license      NOTICE.txt
build.txt  Install-Linux-tar.txt  lib  LICENSE.txt  plugins
[mythcat@desk android-studio]$ cd bin/
[mythcat@desk bin]$ ls
appletviewer.policy  idea.properties  printenv.py         studio.sh
format.sh            inspect.sh       restart.py          studio.vmoptions
fsnotifier           lldb             studio64.vmoptions
fsnotifier64         log.xml          studio.png
[mythcat@desk bin]$ ./studio.sh
Select Plugins to add Dart and Flotter plugins:
You need to install Dart and Flotter plugins, use search:

Download and unarchive the Flutter from official webpage.
Next steps is to set the path for the Flutter and make settings for android licenses:
[mythcat@desk ~]$ export PATH=`pwd`/flutter/bin:$PATH
[mythcat@desk ~]$ cd flutter/
[mythcat@desk flutter]$ ls
analysis_options_repo.yaml  bin              flutter_console.bat  README.md
analysis_options.yaml       CONTRIBUTING.md  LICENSE              version
appveyor.yml                dev              packages
AUTHORS                     examples         PATENTS
[mythcat@desk flutter]$ cd bin/
[mythcat@desk bin]$ ls
cache  flutter  flutter.bat  internal
[mythcat@desk bin]$ ./flutter doctor --android-licenses
Warning: File /home/mythcat/.android/repositories.cfg could not be loaded.      
All SDK package licenses accepted.======] 100% Computing updates...             
[mythcat@desk bin]$ ./flutter doctor 
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel beta, v0.5.1, on Linux, locale en_US.UTF-8)
[✓] Android toolchain - develop for Android devices (Android SDK 28.0.0)
[✓] Android Studio (version 3.1)
[!] Connected devices
    ! No devices available

! Doctor found issues in 1 category.

Use flutter command to get more help :
[mythcat@desk bin]$ ./flutter
Manage your Flutter app development.

Common commands:

  flutter create output directory=""
    Create a new Flutter project in the specified directory.

  flutter run [options]
    Run your Flutter application on an attached device or in an emulator.

Usage: flutter  [arguments]

Global options:
-h, --help            Print this usage information.
-v, --verbose         Noisy logging, including all shell commands executed.
-d, --device-id       Target device id or name (prefixes allowed).
    --version         Reports the version of this tool.
    --bug-report      Captures a bug report file to submit to the Flutter team (contains local paths, device
                      identifiers, and log snippets).

    --flutter-root    The root directory of the Flutter repository (uses $FLUTTER_ROOT if set).

Available commands:
  analyze          Analyze the project's Dart code.
  build            Flutter build commands.
  channel          List or switch flutter channels.
  clean            Delete the build/ directory.
  config           Configure Flutter settings.
  create           Create a new Flutter project.
  devices          List all connected devices.
  doctor           Show information about the installed tooling.
  drive            Runs Flutter Driver tests for the current project.
  emulators        List and launch available emulators.
  format           Format one or more dart files.
  fuchsia_reload   Hot reload on Fuchsia.
  help             Display help information for flutter.
  install          Install a Flutter app on an attached device.
  logs             Show log output for running Flutter apps.
  packages         Commands for managing Flutter packages.
  precache         Populates the Flutter tool's cache of binary artifacts.
  run              Run your Flutter app on an attached device.
  screenshot       Take a screenshot from a connected device.
  stop             Stop your Flutter app on an attached device.
  test             Run Flutter unit tests for the current project.
  trace            Start and stop tracing for a running Flutter app.
  upgrade          Upgrade your copy of Flutter.

Run "flutter help " for more information about a command. 
                                                                                                                                                                                                                                                                                                
Run "flutter help -v" for verbose help output, including less commonly used options.
Restart the Android Studio and create your first Flutter application.
You need to have all settings for your devices or emulated AVD devices to build and develop your android application.

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Tuesday, June 19, 2018

Fedora 28 : The Powertop tool from Intel.

The Powertop is a tool provided by Intel to enable various powersaving modes in userspace, kernel and hardware.
Using this tool is possible to monitor processes and show which of them are utilizing the CPU and wake it from its Idle-States.
The tool allowing you to identify applications with particular high power demands.
The name of this tool powertop.x86_64 come from : Power consumption monitor.
Let's install and set this tool to Fedora 28 distro linux:
[root@desk mythcat]# dnf install powertop.x86_64 
Last metadata expiration check: 0:32:08 ago on Tue 19 Jun 2018 10:19:39 AM EEST.
Dependencies resolved.
================================================================================
 Package           Arch            Version               Repository        Size
================================================================================
Installing:
 powertop          x86_64          2.9-8.fc28            updates          239 k

Transaction Summary
================================================================================
Install  1 Package

Total download size: 239 k
Installed size: 650 k
Is this ok [y/N]: y
Downloading Packages:
powertop-2.9-8.fc28.x86_64.rpm                  112 kB/s | 239 kB     00:02    
--------------------------------------------------------------------------------
Total                                            71 kB/s | 239 kB     00:03     
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                        1/1 
  Installing       : powertop-2.9-8.fc28.x86_64                             1/1 
  Running scriptlet: powertop-2.9-8.fc28.x86_64                             1/1 
  Verifying        : powertop-2.9-8.fc28.x86_64                             1/1 

Installed:
  powertop.x86_64 2.9-8.fc28                                                    

Complete!
You need root privileges to run this tool :
[mythcat@desk ~]$ powertop --calibrate --debug
PowerTOP v2.9 must be run with root privileges.
exiting...
The help output of this tool : 
[root@desk mythcat]# powertop --help

Usage: powertop [OPTIONS]

     --auto-tune     sets all tunable options to their GOOD setting
 -c, --calibrate     runs powertop in calibration mode
 -C, --csv[=filename]     generate a csv report
     --debug         run in "debug" mode
     --extech[=devnode]     uses an Extech Power Analyzer for measurements
 -r, --html[=filename]     generate a html report
 -i, --iteration[=iterations] number of times to run each test
 -q, --quiet         suppress stderr output
 -s, --sample[=seconds]     interval for power consumption measurement
 -t, --time[=seconds]     generate a report for 'x' seconds
 -w, --workload[=workload] file to execute for workload
 -V, --version         print version information
 -h, --help         print this help menu

For more help please refer to the 'man 8 powertop'
To run the program and enable its background services, use the commands below: 
[root@desk mythcat]# systemctl start powertop.service
[root@desk mythcat]# systemctl enable powertop.service
Created symlink /etc/systemd/system/multi-user.target.wants/powertop.service → /usr/lib/systemd/system/powertop.service.
This is my output with powertop calibrate :
[root@desk mythcat]# powertop --calibrate --debug
modprobe cpufreq_stats failedLoaded 0 prior measurements
RAPL device for cpu 0
RAPL Using PowerCap Sysfs : Domain Mask d
RAPL device for cpu 0
RAPL Using PowerCap Sysfs : Domain Mask d
Devfreq not enabled
glob returned GLOB_ABORTED
Starting PowerTOP power estimate calibration 
Calibrating idle
System is not available
System is not available
Calibrating: disk usage 
Calibrating backlight
Calibrating idle
System is not available
System is not available
Calibrating: CPU usage on 1 threads
Calibrating: CPU usage on 4 threads
Calibrating: CPU wakeup power consumption
Calibrating: CPU wakeup power consumption
Calibrating: CPU wakeup power consumption
Calibrating USB devices
.... device /sys/bus/usb/devices/2-1/power/control 
.... device /sys/bus/usb/devices/usb1/power/control 
.... device /sys/bus/usb/devices/1-1.3/power/control 
.... device /sys/bus/usb/devices/1-1/power/control 
.... device /sys/bus/usb/devices/usb2/power/control 
Calibrating radio devices
Finishing PowerTOP power estimate calibration 
Parameters after calibration:


Parameter state 
----------------------------------
Value        Name
 0.50        alsa-codec-power (12)
 0.00        backlight (4)
 0.00        backlight-boost-100 (8)
 0.00        backlight-boost-40 (6)
 0.00        backlight-boost-80 (7)
 0.00        backlight-power (5)
 2.33        base power (70)
 1.56        cpu-consumption (3)
39.50        cpu-wakeups (2)
 0.00        disk-operations (73)
 0.20        disk-operations-hard (72)
 0.00        enp2s0-link-100 (21)
 0.00        enp2s0-link-1000 (22)
 0.00        enp2s0-link-high (23)
 0.00        enp2s0-packets (24)
 0.00        enp2s0-powerunsave (20)
 0.00        enp2s0-up (19)
 0.56        gpu-operations (71)
 0.00        runtime-0000:00:00.0 (34)
 0.00        runtime-0000:00:02.0 (37)
 0.00        runtime-0000:00:16.0 (44)
 0.00        runtime-0000:00:1a.0 (35)
 0.00        runtime-0000:00:1b.0 (45)
 0.00        runtime-0000:00:1c.0 (41)
 0.00        runtime-0000:00:1c.2 (38)
 0.00        runtime-0000:00:1c.3 (31)
 0.00        runtime-0000:00:1d.0 (36)
 0.00        runtime-0000:00:1e.0 (32)
 0.00        runtime-0000:00:1f.0 (42)
 0.00        runtime-0000:00:1f.2 (39)
 0.00        runtime-0000:00:1f.3 (33)
 0.00        runtime-0000:02:00.0 (43)
 0.00        runtime-0000:03:00.0 (40)
 0.00        runtime-Fixed MDIO bus.0 (57)
 0.00        runtime-INT0800:00 (52)
 0.00        runtime-PNP0103:00 (49)
 0.00        runtime-PNP0800:00 (48)
 0.00        runtime-PNP0C04:00 (51)
 0.00        runtime-PNP0C0C:00 (58)
 0.00        runtime-alarmtimer (54)
 0.00        runtime-coretemp.0 (55)
 0.00        runtime-gpio_ich.1.auto (47)
 0.00        runtime-i2c-0 (67)
 0.00        runtime-i2c-1 (63)
 0.00        runtime-i2c-2 (66)
 0.00        runtime-i2c-3 (62)
 0.00        runtime-i2c-4 (65)
 0.00        runtime-i2c-5 (69)
 0.00        runtime-i2c-6 (64)
 0.00        runtime-i2c-7 (68)
 0.00        runtime-i8042 (60)
 0.00        runtime-iTCO_wdt.0.auto (61)
 0.00        runtime-microcode (53)
 0.00        runtime-pcspkr (56)
 0.00        runtime-platform-framebuffer.0 (50)
 0.00        runtime-reg-dummy (46)
 0.00        runtime-serial8250 (59)
 0.10        usb-device-1d6b-0002 (10)
 0.10        usb-device-248a-8366 (11)
 0.10        usb-device-8087-0024 (9)
 0.00        virbr0-link-100 (15)
 0.00        virbr0-link-1000 (16)
 0.00        virbr0-link-high (17)
 0.00        virbr0-nic-link-100 (27)
 0.00        virbr0-nic-link-1000 (28)
 0.00        virbr0-nic-link-high (29)
 0.00        virbr0-nic-packets (30)
 0.00        virbr0-nic-powerunsave (26)
 0.00        virbr0-nic-up (25)
 0.00        virbr0-packets (18)
 0.00        virbr0-powerunsave (14)
 0.00        virbr0-up (13)
 0.10        xwakes (74)

Score:    0.0  (  0.0)
Guess:    2.3
Actual:   0.0
----------------------------------
Learning debugging enabled


Parameter state 
----------------------------------
Value        Name
 0.50        alsa-codec-power (12)
 0.00        backlight (4)
 0.00        backlight-boost-100 (8)
 0.00        backlight-boost-40 (6)
 0.00        backlight-boost-80 (7)
 0.00        backlight-power (5)
 2.33        base power (70)
 1.56        cpu-consumption (3)
39.50        cpu-wakeups (2)
 0.00        disk-operations (73)
 0.20        disk-operations-hard (72)
 0.00        enp2s0-link-100 (21)
 0.00        enp2s0-link-1000 (22)
 0.00        enp2s0-link-high (23)
 0.00        enp2s0-packets (24)
 0.00        enp2s0-powerunsave (20)
 0.00        enp2s0-up (19)
 0.56        gpu-operations (71)
 0.00        runtime-0000:00:00.0 (34)
 0.00        runtime-0000:00:02.0 (37)
 0.00        runtime-0000:00:16.0 (44)
 0.00        runtime-0000:00:1a.0 (35)
 0.00        runtime-0000:00:1b.0 (45)
 0.00        runtime-0000:00:1c.0 (41)
 0.00        runtime-0000:00:1c.2 (38)
 0.00        runtime-0000:00:1c.3 (31)
 0.00        runtime-0000:00:1d.0 (36)
 0.00        runtime-0000:00:1e.0 (32)
 0.00        runtime-0000:00:1f.0 (42)
 0.00        runtime-0000:00:1f.2 (39)
 0.00        runtime-0000:00:1f.3 (33)
 0.00        runtime-0000:02:00.0 (43)
 0.00        runtime-0000:03:00.0 (40)
 0.00        runtime-Fixed MDIO bus.0 (57)
 0.00        runtime-INT0800:00 (52)
 0.00        runtime-PNP0103:00 (49)
 0.00        runtime-PNP0800:00 (48)
 0.00        runtime-PNP0C04:00 (51)
 0.00        runtime-PNP0C0C:00 (58)
 0.00        runtime-alarmtimer (54)
 0.00        runtime-coretemp.0 (55)
 0.00        runtime-gpio_ich.1.auto (47)
 0.00        runtime-i2c-0 (67)
 0.00        runtime-i2c-1 (63)
 0.00        runtime-i2c-2 (66)
 0.00        runtime-i2c-3 (62)
 0.00        runtime-i2c-4 (65)
 0.00        runtime-i2c-5 (69)
 0.00        runtime-i2c-6 (64)
 0.00        runtime-i2c-7 (68)
 0.00        runtime-i8042 (60)
 0.00        runtime-iTCO_wdt.0.auto (61)
 0.00        runtime-microcode (53)
 0.00        runtime-pcspkr (56)
 0.00        runtime-platform-framebuffer.0 (50)
 0.00        runtime-reg-dummy (46)
 0.00        runtime-serial8250 (59)
 0.10        usb-device-1d6b-0002 (10)
 0.10        usb-device-248a-8366 (11)
 0.10        usb-device-8087-0024 (9)
 0.00        virbr0-link-100 (15)
 0.00        virbr0-link-1000 (16)
 0.00        virbr0-link-high (17)
 0.00        virbr0-nic-link-100 (27)
 0.00        virbr0-nic-link-1000 (28)
 0.00        virbr0-nic-link-high (29)
 0.00        virbr0-nic-packets (30)
 0.00        virbr0-nic-powerunsave (26)
 0.00        virbr0-nic-up (25)
 0.00        virbr0-packets (18)
 0.00        virbr0-powerunsave (14)
 0.00        virbr0-up (13)
 0.10        xwakes (74)

Score:    0.0  (  0.0)
Guess:    2.3
Actual:   0.0
----------------------------------
Now we can sets all tunable options to their GOOD setting: 
[root@desk mythcat]# powertop --auto-tune
modprobe cpufreq_stats failedLoaded 0 prior measurements
RAPL device for cpu 0
RAPL Using PowerCap Sysfs : Domain Mask d
RAPL device for cpu 0
RAPL Using PowerCap Sysfs : Domain Mask d
Devfreq not enabled
glob returned GLOB_ABORTED
Leaving PowerTOP
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Monday, June 18, 2018

Fedora 28 : Godot game engine.

Today I tested the new version of Godot game engine - version 3.0.3 .
You can download it from official webpage.
I used the 64 bit version.
After download and unzip you can run the binary file in your user terminal.
The Godot game engine start with a GUI.
Into the right area of screen into Scene tab two objects: Spatial and Camera.
You need to select or add a WoldEnvironment node.
Take a look to the Inspector and use with New Environment .
Run this with the play icon.
If is all right you can see something like this:

Create e new folder into your project and name it Export.
Copy the mscorelib.dll into this folder.
Go to main menu and select Project - Export and you will see this GUI for export your game.
Press Add button to select Linux/X11 output:
Select Linux and press Export Project button.
Go to Export folder and run from your linux terminal your game.
This game engine working well with Fedora 28 and the export running without errors.
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Friday, June 15, 2018

Fedora 28 : ARM programming and testing .

This is a simple tutorial about ARM programming and QEMU:
The test.c program is this : 
volatile unsigned int * const UART0DR = (unsigned int *)0x101f1000;
 
void print_uart0(const char *s) {
 while(*s != '\0') { /* Loop until end of string */
 *UART0DR = (unsigned int)(*s); /* Transmit char */
 s++; /* Next char */
 }
}
 
void c_entry() {
 print_uart0("Hello world!\n");
}

Using volatile keyword is necessary to instruct the compiler that the memory pointed.
The unsigned int type enforces 32-bits read and write access.
The QEMU model like in a real system on chip the Transmit FIFO Full flag must be checked in the UARTFR register before writing on the UARTDR register.
Create the startup.s assembler file: 
.global _Reset
_Reset:
 LDR sp, =stack_top
 BL c_entry
 B .
Create the script linker named test.ld: 
ENTRY(_Reset)
SECTIONS
{
 . = 0x10000;
 .startup . : { startup.o(.text) }
 .text : { *(.text) }
 .data : { *(.data) }
 .bss : { *(.bss COMMON) }
 . = ALIGN(8);
 . = . + 0x1000; /* 4kB of stack memory */
 stack_top = .;
}
Next step is the install of arm-none-eabi x86_64 tools :
[root@desk arm-source]# dnf install arm-none-eabi-gcc-cs-c++.x86_64 
Last metadata expiration check: 1:54:04 ago on Fri 15 Jun 2018 06:55:54 PM EEST.
Package arm-none-eabi-gcc-cs-c++-1:7.1.0-5.fc27.x86_64 is already installed, skipping.
Dependencies resolved.
Nothing to do.
Complete!
[root@desk arm-source]# dnf install arm-none-eabi-gdb.x86_64 
Last metadata expiration check: 1:54:48 ago on Fri 15 Jun 2018 06:55:54 PM EEST.
Package arm-none-eabi-gdb-7.6.2-4.fc24.x86_64 is already installed, skipping.
Dependencies resolved.
Nothing to do.
Complete!
[mythcat@desk arm-source]$ ll
total 12
-rw-rw-r--. 1 mythcat mythcat  60 Jun 15 20:28 startup.s
-rw-rw-r--. 1 mythcat mythcat 288 Jun 15 20:26 test.c
-rw-rw-r--. 1 mythcat mythcat 223 Jun 15 20:29 test.ld
Let's test this with qemu virtual tool ( use Ctr+A and X keys to stop qemu) : 
[mythcat@desk arm-source]$ qemu-system-arm -M versatilepb -m 64M -nographic -kernel test.bin
pulseaudio: set_sink_input_volume() failed
pulseaudio: Reason: Invalid argument
pulseaudio: set_sink_input_mute() failed
pulseaudio: Reason: Invalid argument
Hello world!
QEMU: Terminated
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Friday, June 1, 2018

Fedora 28 : Using python to create old GUI.

The asciimatics python module provides a widgets sub-package that allows you to create interactive text user interfaces.
This python module lets you create full-screen text UIs and interactive forms to ASCII animations. The python module was created to working with any platform and python version 2 and 3.
It is licensed under the Apache Software Foundation License 2.0, see this license here.
Let see the installation process using the Fedora 28 and python version 3.6:
[root@desk mythcat]# dnf install python3
Last metadata expiration check: 2:39:44 ago on Fri 01 Jun 2018 12:51:55 PM EEST.
Package python3-3.6.5-1.fc28.x86_64 is already installed, skipping.
Dependencies resolved.
Nothing to do.
Complete!
You need also to install the asciimatics python module using the pip tool:
[mythcat@desk ~]$ pip3.6 install --user asciimatics
Collecting asciimatics
  Using cached https://files.pythonhosted.org/packages/.../asciimatics-1.9.0-py2.py3-none-any.whl
Requirement already satisfied: future in /usr/local/lib/python3.6/site-packages (from asciimatics)
Requirement already satisfied: wcwidth in /usr/local/lib/python3.6/site-packages (from asciimatics)
Requirement already satisfied: Pillow>=2.7.0 in /usr/lib64/python3.6/site-packages (from asciimatics)
Requirement already satisfied: pyfiglet>=0.7.2 in /usr/local/lib/python3.6/site-packages (from asciimatics)
Installing collected packages: asciimatics
Successfully installed asciimatics-1.9.0
I tested some sample from the author GitHub account and is working good.
Some samples require some extra python module and you will need to install them.
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Wednesday, May 30, 2018

Fedora 28 : The Lynis and system security .

Lynis is a lightweight and easy open source auditing tool to evaluate current system security.
The official webpage can be found here.
I tested the version 263 and now the Fedora development team test the 264 version.
This tool will show you a detailed report of each and every aspect of system :
  • Boot and services
  • Kernel
  • Memory and processes
  • Users, groups, and authentication
  • File systems
  • Home directories
  • File permissions
  • Software: Malware
  • Security frameworks
  • Logging and files
  • SSH support
# dnf install lynis 
# lynis audit system  >> lynix_out.txt
The result is a text file ( 27 Kb sized for my system ) with all infos about your current system security.
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Saturday, May 26, 2018

Fedora 28 : Can you fix your Fedora !?

Fedora Packages have a different installation and development process thanks to testing and development teams.
Note: The common user may have networking problems and these will still lead to further errors.
A common error that should be more documented and constrained is:
Error: Failed to synchronize cache for repo 'updates'.

If you did not have intruders in the computer or provider changes to modify this process, then here are some elements that help you understand how it works.
The process of cleanup of temporary files kept for repositories and update / upgrade is still a testing and development process.
This includes any such data left behind from disabled or removed repositories as well as for different distribution release versions.
  • dnf clean dbcache : this removes cache files generated from the repository metadata and forces DNF to regenerate the cache files the next time it is run.
  • dnf clean expire-cache : this marks the repository metadata expired and will re-validate the cache for each repo the next time it is used.
  • dnf clean metadata : just removes repository metadata files which is uses to determine the remote availability of packages and will make to download all the metadata the next time it is run.
  • dnf clean packages :  removes any cached packages from the system.
  • dnf clean all : does all of the above.
You can mix these commands so you can get the desired effect with the shell tool dnf , see this example: 
dnf update --refresh
This will make a update but with this feature: --refresh will set metadata as expired before running the command.
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Friday, May 25, 2018

Fedora 28 : Video about development and fix packages.

The fedora 28 distribution is an advanced Linux distribution that includes tools and is supported by the fedora community.
The clear and essential reason for the right development is the learning area.
Here's a great video tutorial about developing fedora packets and that's very useful.

I do not know what it is with this group name the Factory 2.0 devel group , but they are very useful information.
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Friday, May 11, 2018

Fedora 28 : The LibreCAD application.

LibreCAD - originally CADuntu is a free Open Source CAD application and today I tested with my Fedora 28.
The content for this application is available under Creative Commons Attribution Share Alike. LibreCAD is a free and open-source and can be downloaded from official webpage.
Let's see the install process of this tool: 
[root@desk mythcat]# dnf install librecad.x86_64
Last metadata expiration check: 3:00:39 ago on Fri 11 May 2018 07:51:19 PM EEST.
Dependencies resolved.
================================================================================
 Package                  Arch          Version             Repository     Size
================================================================================
Installing:
 librecad                 x86_64        2.1.0-7.fc28        fedora        2.3 M
Installing dependencies:
 libdxfrw                 x86_64        0.6.3-8.fc28        fedora        438 k
 librecad-fonts           noarch        2.1.0-7.fc28        fedora         11 M
 librecad-langs           noarch        2.1.0-7.fc28        fedora        603 k
 librecad-parts           noarch        2.1.0-7.fc28        fedora        903 k
 librecad-patterns        noarch        2.1.0-7.fc28        fedora        217 k
 shapelib                 x86_64        1.4.1-2.fc28        fedora         80 k

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

Total download size: 15 M
Installed size: 109 M
Is this ok [y/N]: y
Downloading Packages:
(1/7): libdxfrw-0.6.3-8.fc28.x86_64.rpm         658 kB/s | 438 kB     00:00    
(2/7): librecad-langs-2.1.0-7.fc28.noarch.rpm   1.4 MB/s | 603 kB     00:00    
(3/7): librecad-2.1.0-7.fc28.x86_64.rpm         1.5 MB/s | 2.3 MB     00:01    
(4/7): librecad-parts-2.1.0-7.fc28.noarch.rpm   1.6 MB/s | 903 kB     00:00    
(5/7): shapelib-1.4.1-2.fc28.x86_64.rpm         1.3 MB/s |  80 kB     00:00    
(6/7): librecad-patterns-2.1.0-7.fc28.noarch.rp 1.3 MB/s | 217 kB     00:00    
(7/7): librecad-fonts-2.1.0-7.fc28.noarch.rpm   3.0 MB/s |  11 MB     00:03    
--------------------------------------------------------------------------------
Total                                           3.5 MB/s |  15 MB     00:04     
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                        1/1 
  Installing       : shapelib-1.4.1-2.fc28.x86_64                           1/7 
  Running scriptlet: shapelib-1.4.1-2.fc28.x86_64                           1/7 
  Installing       : librecad-patterns-2.1.0-7.fc28.noarch                  2/7 
  Installing       : librecad-parts-2.1.0-7.fc28.noarch                     3/7 
  Installing       : librecad-langs-2.1.0-7.fc28.noarch                     4/7 
  Installing       : librecad-fonts-2.1.0-7.fc28.noarch                     5/7 
  Installing       : libdxfrw-0.6.3-8.fc28.x86_64                           6/7 
  Running scriptlet: libdxfrw-0.6.3-8.fc28.x86_64                           6/7 
  Installing       : librecad-2.1.0-7.fc28.x86_64                           7/7 
  Running scriptlet: librecad-2.1.0-7.fc28.x86_64                           7/7 
  Verifying        : librecad-2.1.0-7.fc28.x86_64                           1/7 
  Verifying        : libdxfrw-0.6.3-8.fc28.x86_64                           2/7 
  Verifying        : librecad-fonts-2.1.0-7.fc28.noarch                     3/7 
  Verifying        : librecad-langs-2.1.0-7.fc28.noarch                     4/7 
  Verifying        : librecad-parts-2.1.0-7.fc28.noarch                     5/7 
  Verifying        : librecad-patterns-2.1.0-7.fc28.noarch                  6/7 
  Verifying        : shapelib-1.4.1-2.fc28.x86_64                           7/7 

Installed:
  librecad.x86_64 2.1.0-7.fc28          libdxfrw.x86_64 0.6.3-8.fc28            
  librecad-fonts.noarch 2.1.0-7.fc28    librecad-langs.noarch 2.1.0-7.fc28      
  librecad-parts.noarch 2.1.0-7.fc28    librecad-patterns.noarch 2.1.0-7.fc28   
  shapelib.x86_64 1.4.1-2.fc28         

Complete!
I start the application from command shell and this is the output I got. 
[mythcat@desk ~]$ librecad 
RS_DEBUG::setLevel(3)
RS_DEBUG: Critical
RS_DEBUG: Errors
RS_DEBUG: Warnings
libpng warning: iCCP: known incorrect sRGB profile
The application works great I don't know from where come the errors.
You can used to test your skills into the area of
The official manual can be found here.
This is a screenshot from my Fedora 28 distro:

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Fedora 28 : The Spin tool for 2D animation.

The spine is a 2D skeletal animation tool for your video games.
This tool comes with features to building great looking animations.
Spine exports animation data in its own, documented JSON and binary formats.
You can export animated GIFs, PNG or JPEG image sequences and AVI or QuickTime video.
I install the trial version into my Fedora 28 distro easy.
First, you need to download it and unarchive from the official website.
The next step will start with this command:
[mythcat@desk ~]$ cd SpineTrial/
[mythcat@desk SpineTrial]$ dir
examples  launcher  license.txt  runtimes  scripts  SpineTrial.sh
[mythcat@desk SpineTrial]$ sh SpineTrial.sh 
Spine Launcher 3.6.49 Trial
Linux amd64 4.16.6-302.fc28.x86_64
Java 1.7.0_80 Esoteric Software
64-bit Server VM
Downloading: Spine 3.7.16-beta Trial
Update complete.
Spine 3.7.16-beta Trial
Intel Open Source Technology Center
Mesa DRI Intel(R) Ivybridge Desktop 
3.0 Mesa 18.0.2
Resetting hotkeys (new version).
Using customized hotkeys.
Started.
May 10, 2018 6:54:08 PM java.util.prefs.FileSystemPreferences checkLockFile0ErrorCode
WARNING: Could not lock System prefs. Unix error code 0.
May 10, 2018 6:54:08 PM java.util.prefs.FileSystemPreferences syncWorld
WARNING: Couldn't flush system prefs: java.util.prefs.BackingStoreException: 
Couldn't get file lock.
May 10, 2018 6:54:38 PM java.util.prefs.FileSystemPreferences checkLockFile0ErrorCode
WARNING: Could not lock System prefs. Unix error code 0.
May 10, 2018 6:54:38 PM java.util.prefs.FileSystemPreferences syncWorld
WARNING: Couldn't flush system prefs: java.util.prefs.BackingStoreException: 
Couldn't get file lock
You can some warnings but the tool works great.
More about graphics and Linux design you can find articles on my website.
Look at these screenshots with Spine tool:

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Monday, April 23, 2018

Fedora 28 : The OpenShot video editor.

This is a video editor for linux and many operating systems. I tested with Fedora 28 and works good. The install of this is very simple with dnf tool: 
# dnf install openshot.noarch
The development team add many features into this software:
Feature list
Cross-platform video editing software (Linux, Mac, and Windows)
Support for many video, audio, and image formats
Powerful curve-based Key frame animations
Desktop integration (drag and drop support)
Unlimited tracks / layers
Clip resizing, scaling, trimming, snapping, rotation, and cutting
Video transitions with real-time previews
Compositing, image overlays, watermarks
Title templates, title creation, sub-titles
3D animated titles (and effects)
Advanced Timeline (including Drag & drop, scrolling, panning, zooming, and snapping)
Frame accuracy (step through each frame of video)
Time-mapping and speed changes on clips (slow/fast, forward/backward, etc...)
Audio mixing and editing
Digital video effects, including brightness, gamma, hue, greyscale, chroma key (bluescreen / greenscreen) , and many more!
The license for this software is this:
License OpenShot™ is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This is a screenshot on my Fedora distro.
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Tuesday, April 17, 2018

Fedora 28 : GoLang first example .

This tutorial is about GoLang IDE . About this IDE you can read more here - my intro article about this IDE.
I try to used with the platform-native GUI library for Go named andlabs/ui.
First, after you install the IDE you can check the settings on menu Settings: Using this tool with Fedora 28 is easy.
About the first install of andlabs/ui then this come with this error: 
[mythcat@desk ~]$ go get github.com/andlabs/ui
# pkg-config --cflags gtk+-3.0
Package gtk+-3.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk+-3.0.pc'
to the PKG_CONFIG_PATH environment variable
Package 'gtk+-3.0', required by 'virtual:world', not found
pkg-config: exit status 1
That tell us is need to install some packages from Fedora repo: 
# dnf install gtk3-devel
I used this source code to test the andlabs/ui:
package main

import (
   "github.com/andlabs/ui"
)

func main() {
   err := ui.Main(func() {
      input := ui.NewEntry()
      button := ui.NewButton("Greet")
      greeting := ui.NewLabel("")
      box := ui.NewVerticalBox()
      box.Append(ui.NewLabel("Enter your name:"), false)
      box.Append(input, false)
      box.Append(button, false)
      box.Append(greeting, false)
      window := ui.NewWindow("Hello", 200, 100, false)
      window.SetMargined(true)
      window.SetChild(box)
      button.OnClicked(func(*ui.Button) {
         greeting.SetText("Hello, " + input.Text() + "!")
      })
      window.OnClosing(func(*ui.Window) bool {
         ui.Quit()
         return true
      })
      window.Show()
   })
   if err != nil {
      panic(err)
   }
}
First time was run well and after I restart the IDE I got this error: 
# gui_test
/usr/lib/golang/pkg/tool/linux_amd64/link: running gcc failed: exit status 1
gcc: error: /home/mythcat/go/src/github.com/andlabs/ui/libui_linux_amd64.a: No such file or directory

The problem come from GoLang IDE settings and andlabs/ui.
I remove and install again the andlabs/ui and now working well.
The result of this source code come with this output:
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