My Own Percept» how-to

`gem_original_require’: no such file to load — zlib (LoadError)

Marouan OMEZZINE — Sat, 28 Jan 2012 20:21:30 +0000

You may have faced a such a error, when trying to execute gem list :

//lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- zlib (LoadError)
	from //lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
	from //lib/ruby/site_ruby/1.8/rubygems/spec_fetcher.rb:1
	from //lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
	from //lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
	from //lib/ruby/site_ruby/1.8/rubygems/commands/query_command.rb:3
	from //lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
	from //lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
	from //lib/ruby/site_ruby/1.8/rubygems/commands/list_command.rb:2
	from //lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
	from //lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
	from //lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:167:in `load_and_instantiate'
	from //lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:88:in `[]'
	from //lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:144:in `find_command'
	from //lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:131:in `process_args'
	from //lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:102:in `run'
	from //lib/ruby/site_ruby/1.8/rubygems/gem_runner.rb:58:in `run'
	from /bin/gem:21

To solve this issue, move to the zlib/ folder, it should be something like this /usr/src/ruby-1.8.6-pXXX/ext/zlib/

execute the extconf.rb :

1	root@xen1:/usr/src/ruby-1.8.6-p398/ext/zlib# ruby extconf.rb

If every things are ok, you should see:

checking for deflateReset() in -lz... yes
checking for zlib.h... yes
checking for kind of operating system... Unix
creating Makefile

compile and deploy zlib by runnning both commands:

1 2	sudo make sudo make install

Make sure gem command is woking:

gem list

You should see:

1	* LOCAL GEMS *

How to recursively delete .svn directories

Marouan OMEZZINE — Wed, 20 Apr 2011 15:19:59 +0000

Just move to the directory where you want to delete, recursively, the .svn directories and type the folowing line:

rm -rf `find  . -type d -name .svn`

Error: Failed to get the adb version: Cannot run program … on Ubuntu 10.04 (Lucid Lynx)

Marouan OMEZZINE — Sat, 23 Oct 2010 17:51:05 +0000

I met the following error when trying to launch an Android project using eclipse:

[2010-10-23 19:31:02 - adb]Failed to get the adb version: Cannot run program "/usr/src/android-sdk-linux_x86/tools/adb": java.io.IOException: error=2, cialis effectiveness No such file or directory

After googling I found those useful steps to make it running properly:

1. install getlibs from http://frozenfox.freehostia.com/cappy/getlibs-all.deb

2. open terminal and go to your android folder and then platforms/android-1.6/tools

3. run this command from terminal getlibs aapt

Source: http://ubuntuforums.org/showthread.php?t=1317567

How to install Sun Java JRE / JDK on Ubuntu 10.04 (Lucid Lynx)

Marouan OMEZZINE — Sat, 23 Oct 2010 15:52:42 +0000

Copy and paste the following commands into your terminal:

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sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner" 
sudo apt-get update 
sudo apt-get install sun-java6-jre sun-java6-jdk sun-java6-plugin sun-java6-fonts

Verify your java version:

1	java -version

Done

Fatal error: Class ‘Net_SMTP’ not found in /usr/lib/php/Mail/smtp.php on line 349

Marouan OMEZZINE — Mon, 02 Aug 2010 12:48:18 +0000

Error:

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Warning: include_once(Net/SMTP.php) [function.include-once]: failed to open stream: No such file or directory in /usr/lib/php/Mail/smtp.php on line 348 
Warning: include_once() [function.include]: Failed opening 'Net/SMTP.php' for inclusion (include_path='.:/usr/lib/php') in /usr/lib/php/Mail/smtp.php on line 348 
Fatal error: Class 'Net_SMTP' not found in /usr/lib/php/Mail/smtp.php on line 349

Solution:
All you need is to install the missing pear package:

1	sudo pear install Net_SMTP

Creating init.d script for Juggernaut

Marouan OMEZZINE — Sat, 24 Jul 2010 10:26:04 +0000

The Juggernaut plugin for Ruby on Rails aims to revolutionize your Rails app by letting the server initiate a connection and push data to the client. In other words your app can have a real time connection to the server with the advantage of instant updates. Although the obvious use of this is for chat, the most exciting prospect is collaborative cms and wikis.

#!/bin/sh -e 
APP_PATH=/home/zooz.com/current 
JUGGERNAUT_CONFIG="$APP_PATH/juggernaut.yml" 
JUGGERNAUT_PID="$APP_PATH/tmp/pids/juggernaut.pid" 
JUGGERNAUT_LOG="$APP_PATH/log/juggernaut.log" 
RAILS_ENV=production 
case $1 in 
        start) 
                echo "Starting Juggernaut ..." 
                juggernaut -d -c $JUGGERNAUT_CONFIG --pid $JUGGERNAUT_PID --log $JUGGERNAUT_LOG 
        ;; 
        stop) 
                echo "Stopping Juggernaut ..." 
                juggernaut -k * -c $JUGGERNAUT_CONFIG --pid $JUGGERNAUT_PID --log $JUGGERNAUT_LOG 
        ;; 
        restart) 
                echo "Juggernaut restart ..." 
                echo "Stopping Juggernaut ..." 
                juggernaut -k * -c $JUGGERNAUT_CONFIG --pid $JUGGERNAUT_PID --log $JUGGERNAUT_LOG 
                echo "Starting Juggernaut ..." 
                juggernaut -d -c $JUGGERNAUT_CONFIG --pid $JUGGERNAUT_PID --log $JUGGERNAUT_LOG 
        ;; 
esac

ERROR 1045 (28000): Access denied for user ‘root’@'localhost’ (using password: NO)

Marouan OMEZZINE — Mon, 27 Jul 2009 14:10:29 +0000

Today I got the error below :

1	ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

after typing :

1	mysql -u root

I don’t know why ? but I know how to solve it.
First of all let’s disable password authentication :
Stop your MySQL daemon:

1	/etc/init.d/mysql stop

1	/etc/init.d/mysqld stop

Then run the following command line in background :

1	mysqld_safe --skip-grant-tables &

Secondly run :

1	mysql -u root

Finally, In your MySQL command line prompt issue the following command:

USE mysql;
UPDATE user SET password=PASSWORD("my_password") WHERE user="root";
FLUSH PRIVILEGES;
EXIT

Password is now reset to my_password. So just restart your MySQL server using :

1	/etc/init.d/mysql restart

1	/etc/init.d/mysqld restart

and use your new password to authenticate :

1	mysql -u root -p

All that remains is to enter your password.

ERROR: ‘phpize’ failed on ubuntu

Marouan OMEZZINE — Wed, 24 Jun 2009 08:55:22 +0000

Today when I tried to install a pear package using the pecl command line on ubuntu, I got the following error :

pecl install pecl_http
downloading pecl_http-1.6.3.tgz ...
Starting to download pecl_http-1.6.3.tgz (173,005 bytes)
.....................done: 173,005 bytes
71 source files, building
running: phpize
sh: phpize: not found
ERROR: `phpize' failed

Solution :
Just install php5-dev package

1	apt-get install php5-dev

or php4-dev if you are running php 4.x

1	apt-get install php4-dev

LoadError : no such file to load — readline (LoadError) when running script/console on ubuntu

Marouan OMEZZINE — Mon, 15 Jun 2009 12:51:27 +0000

Q : What’s the best thing that may happen to a developer ?
A : A Bug at the beginning of the day

I ran script/console in a rails project to debug something on console, but I got this LoadError:

Loading development environment (Rails 2.1.0)
/usr/local/lib/ruby/1.8/irb/completion.rb:10:in `require’: no such file to load — readline (LoadError)
        from /usr/local/lib/ruby/1.8/irb/completion.rb:10
        from /usr/local/lib/ruby/1.8/irb/init.rb:252:in `require’
        from /usr/local/lib/ruby/1.8/irb/init.rb:252:in `load_modules’
        from /usr/local/lib/ruby/1.8/irb/init.rb:250:in `each’
        from /usr/local/lib/ruby/1.8/irb/init.rb:250:in `load_modules’
        from /usr/local/lib/ruby/1.8/irb/init.rb:21:in `setup’
        from /usr/local/lib/ruby/1.8/irb.rb:54:in `start’
        from /usr/local/bin/irb:13

How to fix ?
I figured out that some libraries are missing after installing ruby from sources (I got those troubles after upgrading my ubuntu from 8.10 to 9.04 and then reinstalling ruby from sources to solve a non-compatibility problem of the already installed ruby binary package with ubuntu 9.04) :

1 2	sudo apt-get install libncurses5-dev sudo apt-get install libreadline5-dev

Then move to your ruby source folder, subfolder ext/readline and then configure, build and install stuffs.

cd /usr/src/ruby-1.8.6-p368/ext/readline/
ruby extconf.rb
sudo make
sudo make install

you may get something like this : ( when running ruby extconf.rb)

marouan@myownpercept:/usr/src/ruby-1.8.6-p368/ext/readline$ sudo ruby extconf.rb
checking for tgetnum() in -lncurses... yes
checking for readline/readline.h... yes
checking for readline/history.h... yes
checking for readline() in -lreadline... yes
checking for rl_filename_completion_function()... yes
checking for rl_username_completion_function()... yes
checking for rl_completion_matches()... yes
checking for rl_deprep_term_function in stdio.h,readline/readline.h,readline/history.h... yes
checking for rl_completion_append_character in stdio.h,readline/readline.h,readline/history.h... yes
checking for rl_basic_word_break_characters in stdio.h,readline/readline.h,readline/history.h... yes
checking for rl_completer_word_break_characters in stdio.h,readline/readline.h,readline/history.h... yes
checking for rl_basic_quote_characters in stdio.h,readline/readline.h,readline/history.h... yes
checking for rl_completer_quote_characters in stdio.h,readline/readline.h,readline/history.h... yes
checking for rl_filename_quote_characters in stdio.h,readline/readline.h,readline/history.h... yes
checking for rl_attempted_completion_over in stdio.h,readline/readline.h,readline/history.h... yes
checking for rl_library_version in stdio.h,readline/readline.h,readline/history.h... yes
checking for rl_event_hook in stdio.h,readline/readline.h,readline/history.h... yes
checking for rl_cleanup_after_signal()... yes
checking for rl_clear_signals()... yes
checking for rl_vi_editing_mode()... yes
checking for rl_emacs_editing_mode()... yes
checking for replace_history_entry()... yes
checking for remove_history()... yes
creating Makefile

How to remove the blue border around an image link

Marouan OMEZZINE — Sun, 12 Apr 2009 17:34:22 +0000

[ad#only_in_post]

You want to use an image as a link.However, a blue border appears around the image.

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<a href="http://www.myownpercept.com/">  
  <img src="logo.png" alt="" />
</a>

This border is meant to inform users that the image is a link. Well, it’s a link but this is ugly :s and may not fit your need.
[ad#hire_me]

Solution

You simply have to add a border-style, set to none, as a style to your img tag

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<a href="http://www.myownpercept.com/">
  <img style="border-style: none;" src="logo.png" alt="" />
</a>

A cleaner way, that will pass the W3C validation, is by adding those lines to your CSS file :
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img { border-style: none; }

A dirty old way, but works, is by adding border attribute to the img tag.

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<a href="http://www.myownpercept.com/">  
  <img src="logo.png" border="0" alt="" />
</a>