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Copyright C 2009, 2010, 2011  Alain Reguera Delgado
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<title>The CentOS Artwork Repository: 3.11 trunk/Identity/Models/Tpl/Promo/Web</title>
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3.11 trunk/Identity/Models/Tpl/Promo/Web

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3.11.1 Goals

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Organize scalable vector graphics (svg) to help describe the CentOS

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web environment.
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3.11.2 The CentOS web environment

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Inside CentOS corporate identity, the CentOS web environment is

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considered a promotion component. The CentOS web environment is formed
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by a central web application --to cover base needs (e.g., per-major
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release information like release notes, lifetime, downloads,
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documentation, support, security advisories, bugs, etc.)-- and many
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different free web applications --to cover specific needs (e.g.,
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wiki, mailing lists, etc.)--. 
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The CentOS web environment is addressed to solve the following issues:

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  • One unique name and one unique visual style to all web
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    applications used inside the web environment.
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  • One-step navigation to web applications inside the environment.
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  • High degree of customization to change the visual style of all
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    web applications with few changes (e.g, updating just two or three
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    images plus common style sheet [CSS] definitions).
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    The CentOS project is attached to a monolithic corporate visual

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    identity (see section trunk/Identity), where all visual manifestations
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    have one unique name and one unique visual style. This way, the CentOS
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    web environment has one unique name (the CentOS brand) and one unique
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    visual style (the CentOS default theme) for all its visual
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    manifestations, the web applications in this case.
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    Since a maintainance point of view, achiving the one unique visual

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    style inside CentOS web environment is not a simple task. The CentOS
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    web environment is built upon many different web applications which
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    have different visual styles and different internal ways to customize
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    their own visual styles. For example: MoinMoin, the web application
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    used to support the CentOS wiki (http://wiki.centos.org/) is
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    highly customizable but Mailman (in its 2.x.x serie), the web
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    application used to support the CentOS mailing list, doesn't
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    support(1) a customization system that separates
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    presentation from logic, similar to MoinMoin's one.
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    This visual style diversity complicates our goal of one unique visual

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    style for all web applications. So, if we want one unique visual style
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    for all web applications used, it is innevitable to modify the web
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    applications in order to implement the CentOS one unique visual style
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    customization in them. Direct modification of upstream applications is
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    not convenient because upstream applications come with their one
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    visual style and administrators take the risk of loosing all
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    customization changes the next time the application be updated (since
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    not all upstream web applications, used in CentOS web environment,
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    separate presentation from logic).
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    To solve the "one unique visual style" issue, installation and

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    actualization of web applications --used inside CentOS web
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    environment-- need to be independent from upstream web applications
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    development line; in a way that CentOS web environment administrators
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    can install and update web applications freely without risk of loosing
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    the one unique visual style customization changes. 
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    At the surface of this issue we can see the need of one specific yum

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    repository to store CentOS web environment customized web applications.
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    3.11.2.1 Design model (without ads)

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    The CentOS web customization design model

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    Figure 3.1: The CentOS web customization design model.

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    3.11.2.2 Design model (with ads)

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    The CentOS web customization design model using promotion

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    Figure 3.2: The CentOS web customization using promotion design model.

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    3.11.2.3 HTML definitions

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    Web environment html defintions

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    Figure 3.3: Web environment html definitions

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    3.11.2.4 Controlling visual style

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    Inside CentOS web environment, the visual style is controlled by the

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    following compenents:
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    Webenv header background
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    trunk/Identity/Themes/Motifs/$THEME/Backgrounds/Img/1024x250.png
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    CSS definitions
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    trunk/Identity/Themes/Models/Default/Promo/Web/CSS/stylesheet.css
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    3.11.2.5 Producing visual style

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    The visual style of CentOS web environment is defined in the following

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    files:
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    trunk/Identity/Themes/Motifs/$THEME/Backgrounds/Xcf/1024x250.xcf
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    trunk/Identity/Themes/Motifs/$THEME/Backgrounds/Img/1024x250.png
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    trunk/Identity/Themes/Motifs/$THEME/Backgrounds/Img/1024x250-bg.png
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    trunk/Identity/Themes/Motifs/$THEME/Backgrounds/Tpl/1024x250.svg
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    As graphic designer you use <tt>`1024x250.xcf'</tt> file to produce

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    <tt>`1024x250-bg.png'</tt> file. Later, inside <tt>`1024x250.svg'</tt> file,
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    you use the <tt>`1024x250-bg.png'</tt> file as background layer to draw
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    your vectorial design. When you consider you artwork ready, use the
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    centos-art.sh script, as described below, to produce the
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    visual style controller images of CentOS web environment.
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    centos-art render --entry=trunk/Identity/Themes/Motifs/$THEME/Backgrounds --filter='1024x250'
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    Once you have rendered required image files, changing the visual style

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    of CentOS web environment is a matter of replacing old image files
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    with new ones, inside webenv repository file system structure. The
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    visual style changes will take effect the next time customization line
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    of CentOS web applications be packaged, uploded, and installed from
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    [webenv] or [webenv-test] repositories.
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    3.11.2.6 Navigation

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    Inside CentOS web environment, the one-step navegation between web

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    applications is addressed using the web environment navigation bar.
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    The web environment navigation bar contains links to main applications
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    and is always visible no matter where you are inside the web
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    environment.
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    The CentOS web navigation design model

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    Figure 3.4: The CentOS web navigation design model.

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    3.11.2.7 Development and release cycle

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    The CentOS web environment development and relase cycle is described

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    below: 
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    Download
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    The first action is download the source code of web applications we

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    want to use inside CentOS web environment.
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    Important

    Important

    The source location from which web application are

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    downloaded is very important. Use SRPMs from CentOS [base]
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    and [updates] repositories as first choise, and third party
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    repositories (e.g. RPMForge, EPEL, etc.) as last resource.
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    Prepare
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    Once web application source code has been downloaded, our duty is

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    organize its files inside <samp>`webenv'</samp> version controlled repository.
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    When preparing the structure keep in mind that different web

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    applications have different visual styles, and also different ways to
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    implement it. A convenient way to organize the file system structure
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    would be create one development line for each web application we use
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    inside CentOS web environment. For example, consider the following
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    file system structure:
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    https://projects.centos.org/svn/webenv/trunk/
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    |-- WebApp1/
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    |   |-- Sources/
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    |   |   `-- webapp1-0.0.1/
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    |   |-- Rpms/
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    |   |   `-- webapp1-0.0.1.rpm
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    |   |-- Srpms/
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    |   |   `-- webapp1-0.0.1.srpm
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    |   `-- Specs/
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    |       `-- webapp1-0.0.1.spec
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    |-- WebApp2/
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    `-- WebAppN/
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    Customize
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    Once web applications have been organized inside the version

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    controlled repository file system, use subversion to create the CentOS
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    customization development line of web applications source code.  For
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    example, using the above file system structure, you can create the
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    customization development line of <tt>`webapp1-0.0.1/'</tt> with the
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    following command:
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    svn cp trunk/WebApp1/Sources/webapp1-0.0.1 trunk/WebApp1/Sources/webapp1-0.0.1-webenv
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    The command above creates the following structure:

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    https://projects.centos.org/svn/webenv/trunk/
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    |-- WebApp1/
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    |   |-- Sources/
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    |   |   |-- webapp1-0.0.1/
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    |   |   `-- webapp1-0.0.1-webenv/
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    |   |-- Rpms/
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    |   |   `-- webapp1-0.0.1.rpm
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    |   |-- Srpms/
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    |   |   `-- webapp1-0.0.1.srpm
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    |   `-- Specs/
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    |       `-- webapp1-0.0.1.spec
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    |-- WebApp2/
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    `-- WebAppN/
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    In the above structure, the <tt>`webapp1-0.0.1-webenv/'</tt> directory is

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    the place where you customize the visual style of
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    <tt>`webapp1-0.0.1/'</tt> web application. 
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    Info

    Tip

    Use Subversion's diff between CentOS

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    customization and upstream development lines to know what you are
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    changing exactly.
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    Build packages
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    When web application has been customized, build the web application

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    RPM and SRPM using the source location with <samp>`-webenv'</samp> prefix. 
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    https://projects.centos.org/svn/webenv/trunk/
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    |-- WebApp1/
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    |   |-- Sources/
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    |   |   |-- webapp1-0.0.1/
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    |   |   `-- webapp1-0.0.1-webenv/
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    |   |-- Rpms/
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    |   |   |-- webapp1-0.0.1.rpm
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    |   |   `-- webapp1-0.0.1-webenv.rpm
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    |   |-- Srpms/
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    |   |   |-- webapp1-0.0.1.srpm
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    |   |   `-- webapp1-0.0.1-webenv.srpm
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    |   `-- Specs/
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    |       |-- webapp1-0.0.1.spec
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    |       `-- webapp1-0.0.1-webenv.spec
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    |-- WebApp2/
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    `-- WebAppN/
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    Release for testing
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    When the customized web application has been packaged, make packages

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    available for testing and quality assurance. This can be achives using
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    a [webenv-test] yum repository. 
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    info

    Note

    The [webenv-test] repository is not shipped inside

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    CentOS distribution default yum configuraiton. In order to use
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    [webenv-test] repository you need to configure it first.
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    If some problem is found to install/update/use the customized version

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    of web application, the problem is notified somewhere (a bugtracker
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    maybe) and the customization face is repated in order to fix the
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    problem. To release the new package add a number after <samp>`-webenv'</samp>
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    prefix. For example, if some problem is found in
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    <tt>`webapp1-0.0.1-webenv.rpm'</tt>, when it be fixed the new package will
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    be named <tt>`webapp1-0.0.1-webenv-1.rpm'</tt>. If a problem is found in
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    <tt>`webapp1-0.0.1-webenv-1.rpm'</tt>, when it be fixed the new package
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    will be named <tt>`webapp1-0.0.1-webenv-2.rpm'</tt>, and so on.
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    The "customization -- release for testing" process is repeated

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    until CentOS quality assurance team considers the package is ready for
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    production.
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    Release for production
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    When customized web application packages are considered ready for

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    production they are moved from [webenv-test] to [webenv] repository.
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    This action is commited by CentOS quality assurance team.
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    info

    Note

    The [webenv] repository is not shipped inside CentOS

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    distribution default yum configuraiton. In order to use [webenv]
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    repository you need to configure it first.
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    3.11.2.8 The [webenv-test] repository

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    /etc/yum.repos.d/CentOS-Webenv-test.repo
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    [webenv-test]
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    name=CentOS-$releasever - Webenv-test
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    mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=webenv-test
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    #baseurl=http://mirror.centos.org/centos/$releasever/webenv-test/$basearch/
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    gpgcheck=1
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    gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-$releasever
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    enabled=1
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    priority=10
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    3.11.2.9 The [webenv] repository

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    /etc/yum.repos.d/CentOS-Webenv.repo
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    [webenv]
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    name=CentOS-$releasever - Webenv
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    mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=webenv
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    #baseurl=http://mirror.centos.org/centos/$releasever/webenv/$basearch/
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    gpgcheck=1
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    gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-$releasever
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    enabled=1
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    priority=10
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    3.11.2.10 Priority configuration

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    Both [webenv] and [webenv-test] repositories update packages inside

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    CentOS [base] and CentOS [updates] repositories.
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    3.11.3 Usage

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      3.11.4 See also

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      3.9 trunk/Identity/Models/Img/Promo/Web  
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