Thursday, November 8, 2018

Fedora 29 : System Storage Manager tool.

This Linux tool comes with this intro:
System Storage Manager provides an easy to use command line interface to manage your storage using various technologies like lvm, btrfs, encrypted volumes and more.
Today I will show an easy way to fix the size of your size of the volume and the file system.
Fist you need to install it with dnf tool :
[root@desk mythcat]# dnf install system-storage-manager
Last metadata expiration check: 1:11:16 ago on Thu 08 Nov 2018 08:04:29 PM EET.
Package system-storage-manager-1.2-1.fc29.noarch is already installed.
Dependencies resolved.
Nothing to do.
Complete!
Use this command to fill up to 100%:
[root@desk mythcat]# ssm resize -s +100%FREE /dev/mapper/fedora-root 
Display the information about all detected devices, pools, volumes, and snapshots, see:
[root@desk mythcat]# ssm list
-------------------------------------------------------------
Device        Free       Used      Total  Pool    Mount point
-------------------------------------------------------------
Check the file system consistency on the volume ( this cannot be use with swap ).
[root@desk mythcat]# ssm check
You can read more about this tool here.

Monday, November 5, 2018

Fedora 29 : the new Fedora 29.

It has been announced for some time to launch Fedora.
Today I have appeared on the interface the possibility to change the old Fedora 28 to Fedora 29.
The interface appeared and I had to click the Download button and then the Install button.
The download process was fast. If you do not have enough disk space then the installation will not work.
After you click the Install button, the installation process will take care of the installation.
Finally, a reset of the distribution will start the new Fedora 29.
I have not found any irregularities or operating problems.
From now on, my posts, tests, and tutorials will be with Fedora 29.

Friday, November 2, 2018

Fedora 28 : Create a ISO image with stage2 and kernel ELF .

The tutorial for today solves the problem of creating an ISO image.
This image can be run and test with QEMU tool emulator like any ISO CDROM image.
You can build your kernel with any assembler and use this steps to test it.
I used the FASM assembly tool. Into my fasm folder I create these folders:
[mythcat@desk fasm]$ mkdir -p iso/boot/grub
You need a stage2 file known like: stage2_eltorito.
This file uses the El Torito is a specification for bootable CD using BIOS functions.
The GRUB supports the no emulation mode in the El Torito specification.
El Torito file booting begins by the Boot Record of the ISO 9660 filesystem at block address 0x11.
You can get this file from your Linux distro of you can find installed into old GRUB.
Put this file into grub folder:
[mythcat@desk fasm] cp /usr/lib/grub/i386-pc/stage2_eltorito  iso/boot/grub/
Use fasm tool with your kernel and use this commands to create the ISO file:
[mythcat@desk fasm]$ ./fasm kernel.asm 
flat assembler  version 1.73.04  (16384 kilobytes memory)
2 passes, 16756 bytes.
[mythcat@desk fasm]$ cp kernel.o iso/boot/kernel.k
[mythcat@desk fasm]$ cat > iso/boot/grub/menu.lst << EOF
> default 0
> timeout 1
> title fasm multiboot
> kernel /boot/kernel.k
> EOF
[mythcat@desk fasm]$ genisoimage -R -b boot/grub/stage2_eltorito -no-emul-boot -boot-load-size 4
 -boot-info-table -o mykernel.iso iso

I: -input-charset not specified, using utf-8 (detected in locale settings)
Size of boot image is 4 sectors -> No emulation
Total translation table size: 2048
Total rockridge attributes bytes: 920
Total directory bytes: 4096
Path table size(bytes): 34
Max brk space used 24000
241 extents written (0 MB)
Now you can test the result:
[mythcat@desk fasm]$ qemu-system-i386 -cdrom mykernel.iso
This is result of my kernel:

Sunday, October 28, 2018

Fedora 28 : The edb debugger.

Today I tested one debug for assembly language.
I used FASM programming language because is very flexible.
The main goal was to find a good debugger and I try the edb debugger.
If you try to use the Fedora dnf tool then you get an older version of this debugger.
[root@desk mythcat]# dnf install edb.x86_64

Because this package is old I try to compile it from source code from github.
Let's see this steps:
[mythcat@desk fasm]$ git clone --recursive https://github.com/eteran/edb-debugger.git

Cloning into 'edb-debugger'...
remote: Enumerating objects: 192, done.
remote: Counting objects: 100% (192/192), done.
...
[root@desk mythcat]# dnf install git make qt5-devel gcc gcc-c++ boost-devel cmake capstone-devel
...
[mythcat@desk edb-debugger]$ mkdir build
[mythcat@desk edb-debugger]$ cd build

[mythcat@desk build]$ cmake ..
-- Boost version: 1.66.0
-- Checking for module 'capstone>=3.0.4'
--   Found capstone, version 3.0.5
-- Checking for module 'libgvc>=2.38.0'
--   Package 'libgvc', required by 'virtual:world', not found
-- Checking for module 'double-conversion'
-- Looking for C++ include double-conversion/double-conversion.h
-- Looking for C++ include double-conversion/double-conversion.h - not found
CMake Warning at CMakeLists.txt:56 (message):
  libdouble-conversion header wasn't found.  32- and 64-bit floating-point
  values will be showed with max_digits10 digits of precision instead of
  shortest representation.


-- Checking for module 'gdtoa-desktop'
--   Package 'gdtoa-desktop', required by 'virtual:world', not found
CMake Warning at CMakeLists.txt:113 (message):
  gdtoa-desktop package wasn't found.  80-bit floating-point values will be
  showed with max_digits10 digits of precision instead of shortest
  representation.


-- Configuring done
-- Generating done
-- Build files have been written to: /home/mythcat/fasm/edb-debugger/build

[mythcat@desk build]$ make
Scanning dependencies of target edb_autogen
...
You can see the executable file named edb into the build folder.
Just run it and the debugger starts.
Into the next image you can see a simple executable run into this debugger:

Monday, October 22, 2018

Fedora 28 : Alien, Steam and Fedora distro.

Today I tried an incurs in converting deb files into packages rpm for Fedora 28.
As you well know, the alien utility is used to solve this problem.
The Debian package I tried to convert is the Steam gaming utility.
[mythcat@desk ~]$ su
Password: 
[root@desk mythcat]# dnf search alien
Last metadata expiration check: 0:02:59 ago on Mon 22 Oct 2018 08:15:33 PM EEST.
========================= Name Exactly Matched: alien ==========================
alien.noarch : Converter between the rpm, dpkg, stampede slp, and Slackware tgz
             : file formats
[root@desk mythcat]# dnf install alien.noarch 
Last metadata expiration check: 0:05:58 ago on Mon 22 Oct 2018 08:15:33 PM EEST.

...
Complete!

[root@desk mythcat]# cd Downloads/

[root@desk Downloads]# alien --scripts -r steam_latest.deb
steam-launcher-1.0.0.56-2.noarch.rpm generated
The next step is the install process:
[root@desk Downloads]# dnf install steam-launcher-1.0.0.56-2.noarch.rpm
Last metadata expiration check: 0:17:36 ago on Mon 22 Oct 2018 08:15:33 PM EEST.
Dependencies resolved.
================================================================================
 Package              Arch         Version             Repository          Size
================================================================================
Installing:
 steam-launcher       noarch       1.0.0.56-2          @commandline       2.8 M

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

Total size: 2.8 M
Installed size: 2.8 M
Is this ok [y/N]: y
Downloading Packages:
Running transaction check
Transaction check succeeded.
Running transaction test
Error: Transaction check error:
  file / from install of steam-launcher-1.0.0.56-2.noarch conflicts with file from package filesystem-3.8-2.fc28.x86_64
  file /lib from install of steam-launcher-1.0.0.56-2.noarch conflicts with file from package filesystem-3.8-2.fc28.x86_64
  file /usr/bin from install of steam-launcher-1.0.0.56-2.noarch conflicts with file from package filesystem-3.8-2.fc28.x86_64
  file /usr/lib from install of steam-launcher-1.0.0.56-2.noarch conflicts with file from package filesystem-3.8-2.fc28.x86_64

Error Summary
-------------
The problem comes from the conversion and I try to see I have the correct packages into my Fedora 28 distro.
[root@desk Downloads]# dnf search filesystem-3.8-2.fc28.x86_64
Last metadata expiration check: 0:19:14 ago on Mon 22 Oct 2018 08:15:33 PM EEST.
No matches found.
[root@desk Downloads]# dnf search filesystem
Last metadata expiration check: 0:20:17 ago on Mon 22 Oct 2018 08:15:33 PM EEST.
======================= Name Exactly Matched: filesystem =======================
filesystem.x86_64 : The basic directory layout for a Linux system
====================== Name & Summary Matched: filesystem ======================
[root@desk Downloads]# dnf install filesystem.x86_64
Last metadata expiration check: 0:22:13 ago on Mon 22 Oct 2018 08:15:33 PM EEST.
Package filesystem-3.8-2.fc28.x86_64 is already installed, skipping.
Dependencies resolved.
Nothing to do.
Complete!
I try again to see is something new , but I got the same error.
[root@desk Downloads]# dnf install steam-launcher-1.0.0.56-2.noarch.rpm
In conclusion: Fedora distro solves a number of shortcomings in the field of package management, but the efforts of the development team do not resolve to cover user requirements. However, the alien utility remains a very important step in the development process that should be updated and optimized to implement new software. I would add here my attempts to create Fedora packets with software that works normally on this distro (Blender 3D - version 2.8).
Let's hope that the Fedora development team will resolve these issues until the next version of this distro.

Saturday, October 13, 2018

Fedora 28 : Fix XFS internal error XFS_WANT_CORRUPTED_GOTO .

It is a common kernel error created under certain predefined conditions.
...kernel: XFS internal error XFS_WANT_CORRUPTED_GOTO...
# xfs_repair -L /dev/mapper/fedora-root
# xfs_repair -L /dev/mapper/fedora-swap
# reboot
This will fix this error.

Wednesday, October 10, 2018

Fedora 28 : Testing Blender 2.80 .

I tested the new Blender 2.80 alpha 2 version and is working well.
You can start to download it from the official download page.
The next step: unarchive the tar.bz file and run the blender from the newly created folder.
I try to create a package but seems the tool not working with the .spec file.
This is a screenshot with this Blender 3D software running in my Fedora 28.

Thursday, October 4, 2018

Fedora 28 : Strife another golang game framework.

Today I tested this 2D game framework named Strife.
You can read more about this from the official website.
The development team tells us:
  "This a work in progress. It provides a very minimal toolset for rendering shapes, images, and text as well as capturing user input."
This game framework uses SDL2 libraries.
Strife is open source and available under the MIT license.
Let's start with installation into Fedora 28 distro.
[root@desk mythcat]# dnf install SDL2-devel.x86_64
[root@desk mythcat]# dnf install SDL2_ttf-devel.x86_64 
[root@desk mythcat]# dnf install SDL2_image-devel.x86_64 
[mythcat@desk ~]$ go get github.com/felixangell/strife
[mythcat@desk ~]$ cd $GOPATH/src/github.com/felixangell/strife
I test one example from installation folder with particles:
[mythcat@desk strife]$ cd example/particles
[mythcat@desk particles]$ go run particles.go
2018/10/04 22:13:18 initializing window  1280 x 720
2018/10/04 22:13:18 dpi, default_dpi =  0 72
2018/10/04 22:13:21 Loading font  /usr/share/fonts/DejaVuSans.ttf
2018/10/04 22:13:21 Failed to load font at '/usr/share/fonts/DejaVuSans.ttf'
 ' try setting a font yourself with strife.LoadFont
resize to  1280 x 960
resize to  1280 x 960
resize to  1280 x 720
resize to  1280 x 720
closing window!
This is result of the running example:

Monday, October 1, 2018

Fedora 28 : Web development with Nikola and python.

The development team comes with this info about Nikola:
Nikola is a static site and blog generator, written in Python. It can use Mako and Jinja2 templates, and input in many popular markup formats, such as reStructuredText and Markdown — and can even turn Jupyter Notebooks into blog posts! It also supports image galleries and is multilingual. Nikola is flexible, and page builds are extremely fast, courtesy of do it (which is rebuilding only what has been changed).
I tested today with Fedora 28 and python version 2.7.15.
If you take a look at Nikola handbook, you will see all the features, options and settings you need for web development.
The installation is very simple:
[mythcat@desk ~]$ pip install Nikola --user
Collecting Nikola
...
Installing collected packages: Nikola
Successfully installed Nikola-7.8.15

[mythcat@desk ~]$ nikola init mysite
[2018-10-01T14:09:02Z] WARNING: Nikola: In order to USE_BUNDLES, you must install the "webassets" Python package.
[2018-10-01T14:09:02Z] WARNING: bundles: Setting USE_BUNDLES to False.
Creating Nikola Site
====================

This is Nikola v7.8.15.  We will now ask you a few easy questions about your new site.
If you do not want to answer and want to go with the defaults instead, simply restart with the `-q` parameter.
--- Questions about the site ---
Site title [My Nikola Site]: my_website
Site author [Nikola Tesla]: catafest
Site author's e-mail [n.tesla@example.com]: catafest@yahoo.com
Site description [This is a demo site for Nikola.]: website with Nikola static sit
Site URL [https://example.com/]: http://example.com
    The URL does not end in '/' -- adding it.
Enable pretty URLs (/page/ instead of /page.html) that don't need web server configuration? [Y/n] y
--- Questions about languages and locales ---
We will now ask you to provide the list of languages you want to use.
Please list all the desired languages, comma-separated, using ISO 639-1 codes.  
The first language will be used as the default.
Type '?' (a question mark, sans quotes) to list available languages.
Language(s) to use [en]: en

Please choose the correct time zone for your blog. Nikola uses the tz database.
You can find your time zone here:
https://en.wikipedia.org/wiki/List_of_tz_database_time_zones

Time zone [Europe/Bucharest]: 
    Current time in Europe/Bucharest: 17:12:36
Use this time zone? [Y/n] y
--- Questions about comments ---
You can configure comments now.  Type '?' (a question mark, sans quotes) to list available comment systems.  
If you do not want any comments, just leave the field blank.
Comment system: 

That's it, Nikola is now configured.  Make sure to edit conf.py to your liking.
If you are looking for themes and addons, check out https://themes.getnikola.com/ and https://plugins.getnikola.com/.
Have fun!
[2018-10-01T14:12:54Z] INFO: init: Created empty site at mysite.
Now you can build and start the server with this command:
[mythcat@desk ~]$ cd mysite/
[mythcat@desk mysite]$ ls
cache  conf.py  conf.pyc  files  galleries  listings  pages  posts
[mythcat@desk mysite]$ nikola build
[2018-10-01T14:14:51Z] WARNING: Nikola: In order to USE_BUNDLES, you must install the "webassets" Python package.
[2018-10-01T14:14:51Z] WARNING: bundles: Setting USE_BUNDLES to False.
Scanning posts........done!
.  render_posts:timeline_changes
...
[2018-10-01T14:14:52Z] WARNING: Nikola: Python 2 is old and busted. Python 3 is the new hotness.
[2018-10-01T14:14:52Z] WARNING: Nikola: Nikola is going to deprecate Python 2 support in 2017. You already have Python 3
available in your system. Why not switch?

Please check http://bit.ly/1FKEsiX for details.

.  sitemap:output/sitemap.xml
.  sitemap:output/sitemapindex.xml
.  robots_file:output/robots.txt
[mythcat@desk mysite]$ nikola serve -b 
Let's see the result of this running server:
To add a post just use this command:
[mythcat@desk mysite]$ nikola new_post
[2018-10-01T14:16:09Z] WARNING: Nikola: In order to USE_BUNDLES, you must install the "webassets" Python package.
[2018-10-01T14:16:09Z] WARNING: bundles: Setting USE_BUNDLES to False.
Creating New Post
-----------------

Title: New post
Scanning posts........done!
[2018-10-01T14:16:24Z] INFO: new_post: Your post's text is at: posts/new-post.rst

[mythcat@desk mysite]$ nikola build
[2018-10-01T14:16:34Z] WARNING: Nikola: In order to USE_BUNDLES, you must install the "webassets" Python package.
[2018-10-01T14:16:34Z] WARNING: bundles: Setting USE_BUNDLES to False.
Scanning posts........done!
.  render_posts:timeline_changes
The result will be this:

There are a few themes for Nikola available at the Themes Index.
[mythcat@desk mysite]$ nikola theme -l
[2018-10-01T14:21:20Z] WARNING: Nikola: In order to USE_BUNDLES, you must install the "webassets" Python package.
[2018-10-01T14:21:20Z] WARNING: bundles: Setting USE_BUNDLES to False.
Available Themes:
-----------------
blogtxt
bnw
bootblog
bootblog-jinja
bootstrap
bootstrap-jinja
bootstrap3-gradients
bootstrap3-gradients-jinja
cadair
canterville
carpet
detox
foundation6
hack
hemingway
hpstr
hyde
jidn
lanyon
libretto
lotabout
material-theme
maupassant
mdl
monospace
oldfashioned
planetoid
readable
reveal
reveal-jinja
slidemenu
srcco.de
yesplease
zen
zen-forkawesome
zen-ipython
zen-jinja

Saturday, September 29, 2018

Fedora 28 : Integrate tinymce editor with Fedora and Django.

This is a raw tutorial about how to integrate the python module named django-tinymce with a Django project.
I used the raw word because you need to have a working Django project into your Fedora distro.
You can see my old tutorial about Django to see how to build a Django project.
About this python module, you can read more here.
The django-tinymce is a Django application that contains a widget to render a form field as a TinyMCE editor.
I have a project named trydjango with a Django application named products into my django folder.
I used activate command to activate my virtual environment:
[mythcat@desk django]$ source bin/activate
I install this python module named django-tinymce:
(django) [mythcat@desk django]$ pip install django-tinymce4-lite
Collecting django-tinymce4-lite
...
Installing collected packages: jsmin, django-tinymce4-lite
Successfully installed django-tinymce4-lite-1.7.2 jsmin-2.2.2
Let's see my folder project django named src:
(django) [mythcat@desk django]$ cd src/
(django) [mythcat@desk src]$ ll
total 136
-rw-r--r--. 1 mythcat mythcat 135168 Sep 28 12:21 db.sqlite3
-rwxrwxr-x. 1 mythcat mythcat    541 Sep 23 18:56 manage.py
drwxrwxr-x. 4 mythcat mythcat    142 Sep 26 21:45 pages
drwxrwxr-x. 4 mythcat mythcat    142 Sep 28 18:30 products
drwxrwxr-x. 3 mythcat mythcat    112 Sep 28 12:04 templates
drwxrwxr-x. 3 mythcat mythcat     93 Sep 28 12:14 trydjango
The installation is simple and star with to your settings.py and url.py file:
(django) [mythcat@desk src]$ cd trydjango/
(django) [mythcat@desk trydjango]$ vim settings.py 

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'products',
    'tinymce',
]
(django) [mythcat@desk trydjango]$ vim urls.py

from django.contrib import admin
from django.urls import path, include

from pages.views import home_view, about_view, contact_view
from products.views import product_detail_view

urlpatterns = [
    path('', home_view, name='home'),
    path('about/', about_view),
    path('contact/',contact_view),
    path('admin/',admin.site.urls),
    path('product/',product_detail_view),
    path(r'^tinymce/', include('tinymce.urls')),
This is my change I used to add the tinymce editor into my django application named products.
(django) [mythcat@desk products]$ vim models.py
from django.db import models
from tinymce.models import HTMLField

# Create your models here.
class Product(models.Model):
    title = models.CharField(max_length=120)
#    description = models.TextField(blank=True, null=True)
    description = HTMLField()
    price = models.DecimalField(decimal_places=2, max_digits=1000)
    summary = models.TextField(default='this is cool!')
You can see I used HTMLField and default come is TextField.
The result of this changes can see into the next output:

Thursday, September 27, 2018

Fedora 28 : Show a video with Google Apps Script.

It's not a tutorial specific to Fedora's distribution, but many users of this are programmers or developers and its tutorial is very useful.
The tutorial is about how to display a video in a sidebar on a Google document.
I used Google Apps Script to do this.
You can see the tutorial here.
This is a screenshot with the output of this tutorial:

Monday, September 24, 2018

Fedora 28 : Add the Fedora logo to the Google document.

I've been able to progress with Google Apps Script.
The latest tutorial with number 008.
This tutorial is about adding a logo and creating an add-on to a document in google drive.
See the full tutorial here, and result of this addon:

Sunday, September 23, 2018

Fedora 28 : Start a service daemon with Python.

In this tutorial I will starting one service using systemctl , python and systemd. First, you need to create a file named testpython.service .
[mythcat@desk system]# cd /etc/systemd/system/
[root@desk system]# vim testpython.service
This file is a configuration file for this service.
[Unit]
Description=Python Service
After=multi-user.target
[Service]
Type=simple
ExecStart=/usr/bin/python /home/mythcat/test_service.py
[Install]
WantedBy=multi-user.target
Create the python file for this service. I named test_service.py .
[root@desk system]# exit
exit
[mythcat@desk system]$ cd ~
[mythcat@desk ~]$ vim test_service.py

#!/usr/bin/env python

import logging
import time

logging.basicConfig(level="INFO")

while True:
    logging.info("Hi")
    time.sleep(3)
Change permissions file for this python file and testpython.service, see:
[mythcat@desk ~]$ chmod 764 test_service.py
Because you run this service with systemd then selinux will send you error, fix that:
[mythcat@desk ~]$ chcon -t bin_t ~/test_service.py
Reload all services and start your service with this commands:
[root@desk system]# systemctl daemon-reload
[root@desk system]# systemctl start  testpython.service
[root@desk system]# systemctl status  testpython.service
● testpython.service - Python Service
   Loaded: loaded (/etc/systemd/system/testpython.service; enabled; vendor>
   Active: active (running) since Sat 2018-09-22 21:36:23 EEST; 5s ago
 Main PID: 7213 (python)
    Tasks: 1 (limit: 2102)
   Memory: 5.7M
   CGroup: /system.slice/testpython.service
           └─7213 /usr/bin/python /home/mythcat/test_service.py

Sep 22 21:36:23 desk systemd[1]: Started Python Service.
Sep 22 21:36:24 desk python[7213]: INFO:root:Hi
Sep 22 21:36:27 desk python[7213]: INFO:root:Hi
You can use the journalctl command to see the output of this service:
[root@desk system]# journalctl -u testpython.service 
-- Logs begin at Sat 2018-09-22 20:40:06 EEST, end at Sat 2018-09-22 21:31:07 EEST. --
Sep 22 20:40:06 desk python[6232]: INFO:root:Hi
Sep 22 20:40:09 desk python[6232]: INFO:root:Hi
Sep 22 20:40:12 desk python[6232]: INFO:root:Hi
Sep 22 20:40:15 desk python[6232]: INFO:root:Hi
Sep 22 20:40:18 desk python[6232]: INFO:root:Hi
Sep 22 20:40:21 desk python[6232]: INFO:root:Hi
Sep 22 20:40:24 desk python[6232]: INFO:root:Hi
Sep 22 20:40:27 desk python[6232]: INFO:root:Hi
Sep 22 20:40:30 desk python[6232]: INFO:root:Hi
Let's see the result:

Sunday, September 16, 2018

Fedora 28 : Using AdonisJs web framework.

AdonisJs is a Node.js web framework with a breath of fresh air and drizzle of elegant syntax on top of it.
We prefer developer joy and stability over anything else.
I tested today this web framework named AdonisJs with Fedora 28.
The main goal was to use MySQL with MariaDB from Fedora 28 distro.
Let's start with the installation of AdonisJs on Fedora 28:
[root@desk mythcat]# npm i --global @adonisjs/cli
/usr/bin/adonis -> /usr/lib/node_modules/@adonisjs/cli/index.js
...
+ @adonisjs/cli@4.0.7
added 406 packages from 182 contributors in 33.533s
Go to the default user:
[root@desk mythcat]# exit
exit
Create the application , I named myapp:
[mythcat@desk ~]$ adonis new myapp
    _       _             _         _     
   / \   __| | ___  _ __ (_)___    | |___ 
  / _ \ / _` |/ _ \| '_ \| / __|_  | / __|
 / ___ \ (_| | (_) | | | | \__ \ |_| \__ \
/_/   \_\__,_|\___/|_| |_|_|___/\___/|___/

  [1/6] 🔬  Requirements matched [node & npm]
  [2/6] 🔦  Ensuring project directory is clean [myapp]
  [3/6] 📥  Cloned [adonisjs/adonis-fullstack-app]
  [4/6] 📦  Dependencies installed
  [5/6] 📖  Environment variables copied [.env]
  [6/6] 🔑  Key generated [adonis key:generate]

🚀   Successfully created project
👉   Get started with the following commands
Let's test the default myapp with this commands:
$ cd myapp
$ adonis serve --dev

[mythcat@desk ~]$ cd myapp
[mythcat@desk myapp]$ adonis serve --dev

 SERVER STARTED 
> Watching files for changes...

2018-09-16T09:47:46.799Z - info: serving app on http://127.0.0.1:3333
This is the result of the running myapp on 127.0.0.1:3333 web address:
Let's see the folders and files from AdonisJS:
[mythcat@desk myapp]$ ls
ace  config    node_modules  package-lock.json  README.md  server.js
app  database  package.json  public             resources  start
The configuration for web files can be seen here:
[mythcat@desk myapp]$ vim  start/routes.js 
'use strict'

/*
|--------------------------------------------------------------------------
| Routes
|--------------------------------------------------------------------------
|
| Http routes are entry points to your web application. You can create
| routes for different URL's and bind Controller actions to them.
|
| A complete guide on routing is available here.
| http://adonisjs.com/docs/4.1/routing
|
*/

/** @type {import('@adonisjs/framework/src/Route/Manager'} */
const Route = use('Route')

Route.on('/').render('welcome')
~                                                                               
This is telling Adonis that when the root of the site is loaded, render a template/view called welcome.
That welcome template can be found in /resources/views/welcome.edge.
[mythcat@desk myapp]$ cd resources/
[mythcat@desk resources]$ ll
total 0
drwxrwxr-x. 2 mythcat mythcat 26 Sep 16 12:46 views
[mythcat@desk resources]$ cd views/
[mythcat@desk views]$ ll
total 4
-rw-rw-r--. 1 mythcat mythcat 339 Sep 16 12:46 welcome.edge
Let's see the source code of this default webpage:
[mythcat@desk views]$ vim welcome.edge 
...
For example, if you change into start/routes.js from welcome to index then you need to rename the welcome.edge to index.edge .
About css files you can make changes into public/style.css :
[mythcat@desk myapp]$ cd public/
[mythcat@desk public]$ vim  style.css


@import url('https://fonts.googleapis.com/css?family=Montserrat:300');

html, body {
  height: 100%;
  width: 100%;
}

body {
  font-family: 'Montserrat', sans-serif;
  font-weight: 300;
  background-image: url("/splash.png");
  background-color: #220052;
}

* {
  margin: 0;
  padding: 0;
}
...
Using the mysql database is simple. Into Fedora 28 distro you can use mariadb, let's install it.
[mythcat@desk myapp]$ su
Password: 
[root@desk myapp]# dnf install mariadb mariadb-server
...
Complete!
[root@desk myapp]# systemctl start mariadb
[root@desk myapp]# systemctl status mariadb
● mariadb.service - MariaDB 10.2 database server
...
You need to make changes into .env file into your project folder.
[mythcat@desk myapp]$ vim .env
HOST=127.0.0.1
PORT=3333
NODE_ENV=development
APP_URL=http://${HOST}:${PORT}
CACHE_VIEWS=false
APP_KEY=xxxxxxxxxxxxxxxx
DB_CONNECTION=sqlite
DB_HOST=127.0.0.1
DB_PORT=3306
DB_USER=root
DB_PASSWORD=
DB_DATABASE=adonis
SESSION_DRIVER=cookie
HASH_DRIVER=bcrypt
~
Use this changes for mariadb:
DB_CONNECTION=mysql
Install into AdonisJs with this command:
[mythcat@desk myapp]$ adonis install mysql
  [1/1] 📦  Dependencies installed [mysql]
Use this mysql commands to create the database:
[mythcat@desk myapp]$ mysql -u root
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 18
Server version: 10.2.17-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)]> create database adonis;
Query OK, 1 row affected (0.11 sec)

MariaDB [(none)]> exit;
Bye 
Let's test migration command for files to allow you to create and delete tables.
[mythcat@desk myapp]$ adonis migration:run
migrate: 1503248427885_user.js
migrate: 1503248427886_token.js
Database migrated successfully in 4.11 s
[mythcat@desk myapp]$ adonis make:migration jobs
> Choose an action undefined
✔ create  database/migrations/1537095058367_jobs_schema.js
Now that our database and tables have been created, I can create a model for handling jobs table and associated data.
The next tasks to follow depends by your website:

  • Creating a Model 
  • Creating a Controller 
  • User Authentication

Thursday, September 13, 2018

Fedora: LibreOffice remote connection.

I wrote a tutorial about 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 relevent 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.

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.

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:

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

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 

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
...

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.

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

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.

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

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.

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.

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.

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.

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:

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:

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.

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:

Saturday, April 14, 2018

Fedora 28 : The VS Code on Fedora.

The Visual Studio Code is an editor for development and includes the features you need for highly productive source code editing. You can use this editor with many Linux distros. Today I tested with Fedora 28 distro version.
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
Next step is to install extensions for Python, Golang, PHP, C# and more.

Saturday, April 7, 2018

Fedora 28 : Golang by JetBrains .

This I.D.E. is a commercial and a free 30-day trial.
The price varies :
  • € 199.00 /1st year
  • € 159.00 /2nd year
  • € 119.00 /3rd yr onwards
JetBrains s.r.o. is a software development company whose tools are targeted towards software developers and project managers. 
... 
JetBrains, creator of the leading Java IDE - IntelliJ IDEA - is a cutting-edge software vendor specializing in the creation of intelligent development tools.

The development team come with this infos about the Golang I.D.E. :
GoLand is a new commercial IDE by JetBrains aimed at providing an ergonomic environment for Go development.
... 
The new IDE extends the IntelliJ platform with the coding assistance and tool integrations specific for the Go language.

You can download it from here.
The tree command show install files:
[mythcat@desk bin]$ tree
.
├── format.sh
├── fsnotifier
├── fsnotifier64
├── fsnotifier-arm
├── goland64.vmoptions
├── goland.png
├── goland.sh
├── goland.vmoptions
├── idea.properties
├── inspect.sh
├── libyjpagent-linux64.so
├── libyjpagent-linux.so
├── log.xml
├── printenv.py
└── restart.py

0 directories, 15 files

Some screenshots with this  linux tool:





Sunday, April 1, 2018

Fedora 27 : Fix your distro with systemctl .

This is a simple tutorial about systemctl tool and how to fix one simple error show by status. The help of this cmmand can be found with:
# man systemctl
Let's see how we can see this errors and how this working. First let's see the status for systemctl command (:
# systemctl status
The output is this:
    ● laptop
    State: degraded
     Jobs: 0 queued
   Failed: 1 units
    Since: Sun 2018-04-01 10:44:37 EEST; 58min ago
   CGroup: /
           ├─user.slice
           │ └─user-1000.slice
           │   ├─user@1000.service
           │   │ └─init.scope
           │   │   ├─929 /usr/lib/systemd/systemd --user
           │   │   └─931 (sd-pam)
           │   └─session-1.scope
           │     ├─ 748 login -- mythcat
           │     ├─ 936 -bash
           │     ├─ 982 sudo su
           │     ├─ 986 su
           │     ├─ 987 bash
           │     └─9879 systemctl status
           ├─init.scope
           │ └─1 /usr/lib/systemd/systemd --switched-root --system --deserialize 24
           └─system.slice
             ├─irqbalance.service
             │ └─655 /usr/sbin/irqbalance --foreground
             ├─lvm2-lvmetad.service
             │ └─578 /usr/sbin/lvmetad -f -t 3600
             ├─firewalld.service
             │ └─698 /usr/bin/python3 -Es /usr/sbin/firewalld --nofork --nopid
 ...
Detect the problem from list all failed units:
# systemctl list-units --state=failed
I find the rngd module is the problem. To fix this issue just use this commands:
# systemctl daemon-reload
# systemctl status rngd 
# systemctl stop rngd
# systemctl disable rngd
# systemctl enable rngd
# systemctl start rngd
The next step is reboot and check again if systemctl come with errors.

Saturday, March 31, 2018

Testing the Fedora SOAS.

These are some of the most beautiful projects I appreciate and that's why I'm writing about them.
First is a Fedora Spin with the abbreviations SOAS from Sugar on a Stick.
This Fedora Spin is lightweight and made to run off of a flash drive, or a live CD.
Originally Red Hat and Pentagram developed SoaS as part of the One Laptop Per Child project.
About One Laptop Per Child project you can read here.
They tell us about this project at official web page:
Sugar on a Stick is a Fedora-based operating system featuring the award-winning Sugar Learning Platform and designed to fit on an ordinary USB thumbdrive ("stick").
Let's see some screenshots:

News: Yahoo hit QupZilla.

Like most, you already know as an XFCE environment installation comes with QupZilla web browser.
The QupZilla web browser is a lightweight multiplatform web browser written in Qt Framework and using its web rendering engine QtWebEngine.
If you using Fedora 28 you can get the Falkon web browser.
The Wikipedia tells us about Falkon browser "(formerly QupZilla[3]) is a free and open-source web browser, intended for general users. Falkon is licensed under GPLv3."
The Falkon browser working well with Yahoo.

About QupZilla web browser.

I used this web browser with Fedora 27 distro and then I tested with new Fedora 28.
Same problem from both distros with the Yahoo mail and the QupZilla web browser.
After authenticating when you access the mail button, a message that redirects us to use other browsers.
Is it okay or bad?
Most users would like to have no such issues.

Thursday, March 29, 2018

Fedora 27 : Tips and tricks with hugo framework .

he most important fact in learning development is knowing the information flow and how to drain it knowing the elements and stages of information processing of the content.
That's why I wrote this article succinctly to show you how simple basics of exemplification can correctly complete and help the user to modify and create content.
I will show you how to follow steps into hugo framework and website development with hugo.
You need to read the basic of hugo terms from documentation if you want to learn all about hugo or take some helpful information.
First use --verbose flag gives extra information that will be helpful when we debug or build your hogo website.
You need to know your hugo version because is the old versions has bad issues, check it with:
$ hugo version
The next command is to see and debug your work:
$ hugo --verbose 
How hugo framework works when you start for the first time with hugo development.
Now, the first place that Hugo will look for rules and files is in the layouts/ directory so it will always find the skin.
If you start with hugo then you can change the default.
This files name skins are the files responsible for the look and feel of your site.
You have two ways to create a skin:
  • create it in the layouts/ directory;
  • create it in a sub-directory of the themes/ directory.
A skin in layouts/ folder can’t be customized without updating the templates and static files that it is built from.
The skin created in themes/ folder , can be and that makes it easier for other people to use it.
In my example tutorial , I add this text to themes/test_themes_001/layouts/index.html.
The result of running hugo server command will rput this text on your browser at 127.0.0.1:13131, see command:
$ hugo server --buildDrafts
The hugo command come with many features like :
  • --buildDrafts this include content marked as draft ( see files with draft:true from .md file);
  • --ignoreCache this ignores the cache directory if you use it;
Using --verbose let you to see your errors.
For example a bad template or configuration can come with this error:
 ...Unable to locate layout for "taxonomyTerm" ...
This show you what term created by you is not on your hugo development area.
I make just few changes to show you how the hugo working. First I create the website named hugo_website_001. I used hugo command to add some pages first_test.md and new.md and a theme named test_theme_001, see:
$ hugo new site hugo_website_001
$ cd hugo_website_001
$ hugo new theme test_theme_001
$ hugo new first_test.md
$ hugo new new.md
$ tree 
.
├── archetypes
│   └── default.md
├── config.toml
├── content
│   ├── first_test.md
│   └── new.md
├── data
├── fpaste_hugo.txt
├── layouts
├── public
│   ├── categories
│   │   └── index.xml
│   ├── css
│   ├── index.html
│   ├── index.xml
│   ├── js
│   ├── sitemap.xml
│   └── tags
│       └── index.xml
├── static
└── themes
    └── test_theme_001
        ├── archetypes
        │   └── default.md
        ├── layouts
        │   ├── 404.html
        │   ├── _default
        │   │   ├── list.html
        │   │   └── single.html
        │   ├── index.html
        │   ├── index.html.save
        │   └── partials
        │       ├── footer.html
        │       └── header.html
        ├── LICENSE.md
        ├── static
        │   ├── css
        │   └── js
        └── theme.toml

19 directories, 20 files
$ 
Let's see files for settings - the toml file type. First is the config.toml file:
baseURL = "http://localhost.com"
languageCode = "en-us"
title = "My New Hugo Site"
theme = "test_theme_001"
contentdir ="content"
publishdir = "public"
The next file is the theme.toml .

# theme.toml template for a Hugo theme
# See https://github.com/gohugoio/hugoThemes#themetoml for an example

name = "Test_theme_001"
license = "MIT"
licenselink = "https://github.com/yourname/yourtheme/blob/master/LICENSE.md"
description = "first theme with hugo"
homepage = "http://example.com/"
tags = ["tags","categories"]
features = []
min_version = "0.31"

[author]
  name = "catafest"
  homepage = "free-tutorials.org"

# If porting an existing theme
[original]
  name = ""
  homepage = ""
  repo = ""
I will show a minimal example to understand the changes you need to make to run well with hugo framework and the my custom theme.
I show next how this changes into files is show by hugo on browser.
The basic file load is the index.html from themes/test_theme_001/layouts folder with tag h2 and text Some text !, see:

Some text !


{{ partial "header.html" . }}
This file load another file from partials folder and is named header.html with tag p and this text:
This is a custom header
Let's run the hugo server :
hugo server --theme=test_theme_001 --buildDrafts --ignoreCache --disableFastRender
This is result is this: