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Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author)
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<title>CentOS Artwork Repository: 1.49 The Filesystem/trunk/Scripts/Bash Directory</title>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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[ < ]
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[Top]
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[Contents]
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[Index]
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[ ? ]
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1.49 The <tt>`Filesystem/trunk/Scripts/Bash'</tt> Directory
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1.49.1 Goals
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The <tt>`trunk/Scripts/Bash'</tt> directory exists to organize the trunk
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development line of <tt>`centos-art.sh'</tt> automation script. The
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<tt>`centos-art.sh'</tt> script standardizes frequent tasks inside your
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working copy of CentOS Artwork Repository.
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1.49.2 Description
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The best way to understand <tt>`centos-art.sh'</tt> automation script is
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studying its source code. However, as start point, you may prefer to
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read an introductory resume before diving into the source code
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details.
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The <tt>`centos-art.sh'</tt> script is written in Bash. Most tasks, inside
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<tt>`centos-art.sh'</tt> script, have been organized in many specific
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functionalities that you can invoke from the centos-art
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command-line interface.
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When you type the centos-art command in your terminal, the
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operating system trys to execute that command. In order to execute the
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command, the operating system needs to know where it is, so the
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operating system uses the PATH environment variable to look for
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that command location. If your system was prepared to use CentOS
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Artwork Repository correctly (-- Removed(pxref:trunk Scripts Bash Functions
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Verify) --), you should have a symbolic link inside <tt>`~/bin/'</tt>
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directory that points to the <tt>`centos-art.sh'</tt> script file. As
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<tt>`~/bin/'</tt> directory is, by default, inside PATH environment
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variable, the execution of centos-art command runs the
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<tt>`centos-art.sh'</tt> script.
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When <tt>`centos-art.sh'</tt> script is executed, the first it does is
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executing the <tt>`trunk/Scripts/Bash/initEnvironment.sh'</tt> script to
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initialize global variables (e.g., gettext variables) and
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global function scripts. Global function scripts are located inside
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<tt>`trunk/Scripts/Bash/Functions'</tt> directory and their file names
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begin with <samp>`cli'</samp>. Global function scripts provide common
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functionalities that can be used anywhere inside <tt>`centos-art.sh'</tt>
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script execution environment.
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Once global variables and function scripts have been loaded,
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<tt>`centos-art.sh'</tt> script executes the cli global function
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from <tt>`cli.sh'</tt> function script to retrive command-line arguments
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and define some default values that may be used later by specific
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function scripts (-- Removed(pxref:trunk Scripts Bash Functions) --).
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As convenction, the <tt>`centos-art.sh'</tt> command-line arguments have
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the following format:
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centos-art arg1 --arg2=val2 --arg3=val3
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In the above example, <samp>`centos-art'</samp> is the command you use to
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invoke <tt>`centos-art.sh'</tt> script. The <samp>`arg1'</samp> is required and
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represents the functionality you want to perform (e.g.,
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<samp>`verify'</samp>, <samp>`render'</samp>, <samp>`locale'</samp>, <samp>`manual'</samp>,
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etc.). The remaining arguments are modifiers to <samp>`arg1'</samp>. The
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<samp>`--arg2'</samp> definition is required and represets, specifically,
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the action inside the functionality you want to perform. The
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<samp>`--arg3'</samp> and on, are optional.
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Once command-line arguments have been retrived, the
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<tt>`centos-art.sh'</tt> script loads specific functionalities using the
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<tt>`cli_getFunctions.sh'</tt> function script. Only one specific
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functionality can be loaded at one script execution I.e., you run
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centos-art.sh script to run just one functionality.
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+----------------------------------------------------------------------+
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| [centos@host]$ centos-art function --action='value' --option='value' |
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+----------------------------------------------------------------------+
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| ~/bin/centos-art --> ~/artwork/trunk/Scripts/Bash/centos-art.sh |
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+---v-----------------------------------------v------------------------+
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| centos-art.sh |
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+---v---------------------------------v---+
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. | initEnvironment.sh | .
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. +---------------------------------+ .
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. | cli $@ | .
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. +---v-------------------------v---+ .
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. . | cli_getFunctions | . .
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. . +---v-----------------v---+ . .
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. . . | function1 | . . .
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. . . | function2 | . . .
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. . . | function3 | . . .
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. . . +-----------------+ . . .
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. . ........................... . .
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. ................................... .
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...........................................
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Figure 1.1: The functionalities initialization environment.
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Functionalities are implemented by means of actions. Once the
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functionality has been initiazalized, actions initialization take
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place for that functionality. Actions initialization model is very
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similar to functions initialization model. But with the difference,
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that actions are loaded inside function environment, and so, share
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variables and functions defined inside function environment.
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+--------------------------------------+
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| cli_getFunctions |
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+---v------------------------------v---+
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. | function1 | .
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. +---v----------------------v---+ .
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. . | function1_getActions | . .
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. . +---v--------------v---+ . .
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. . . | action 1 | . . .
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. . . | action 2 | . . .
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. . . | action n | . . .
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. . . +--------------+ . . .
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. . ........................ . .
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. ................................ .
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. +------------------------------+ .
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. | function2 | .
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. +---v----------------------v---+ .
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. . | function2_getActions | . .
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. . +---v--------------v---+ . .
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. . . | action 1 | . . .
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. . . | action 2 | . . .
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. . . | action n | . . .
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. . . +--------------+ . . .
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. . ........................ . .
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. ................................ .
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. +------------------------------+ .
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. | function3 | .
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. +---v----------------------v---+ .
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. . | function3_getActions | . .
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. . +---v--------------v---+ . .
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. . . | action 1 | . . .
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. . . | action 2 | . . .
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. . . | action n | . . .
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. . . +--------------+ . . .
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. . ........................ . .
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. ................................ .
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........................................
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Figure 1.2: The actions initialization environment.
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1.49.3 Usage
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The <tt>`centos-art.sh'</tt> script usage information is described inside
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each specific function documentation (-- Removed(pxref:trunk Scripts Bash
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Functions) --).
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1.49.4 See also
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1.48 The <tt>`Filesystem/trunk/Scripts'</tt> Directory
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