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organization, and administration of CentOS Artwork Repository.
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Copyright C 2009-2011 Alain Reguera Delgado
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Permission is granted to copy, distribute and/or modify this document
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<title>CentOS Artwork Repository: 2.67 The trunk/Scripts/Functions/Path Directory</title>
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/* CSS
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 * repository.css -- This file provides visual style for repository
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 * documentation manual in HTML format, as output by Texi2html
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 * Copyright (C) 2009-2011 Alain Reguera Delgado
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[ < ]
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[ > ]
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[Contents]
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[Index]
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[ ? ]
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2.67 The <tt>`trunk/Scripts/Functions/Path'</tt> Directory

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    2.67.1 Goals 
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    2.67.2 Description 
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      2.67.2.1 Repository layout 
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      2.67.2.2 Repository name convenctions 
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      2.67.2.3 Repository work flow 
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      2.67.2.4 Parallel directories 
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      2.67.2.5 Syncronizing path information 
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      2.67.2.6 What is the right place to store it? 
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      2.67.3 Usage 
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      2.67.4 See also 
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      2.67.1 Goals

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      This section exists to organize files related to path

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      functiontionality.  The path functionality standardizes
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      movement, syncronization, branching, tagging, and general file
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      maintainance inside the repository. 
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      2.67.2 Description

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        2.67.2.1 Repository layout 
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        2.67.2.2 Repository name convenctions 
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        2.67.2.3 Repository work flow 
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        2.67.2.4 Parallel directories 
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        2.67.2.5 Syncronizing path information 
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        2.67.2.6 What is the right place to store it? 
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        "CentOS like trees, has roots, trunk, branches, leaves and

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        flowers.  Day by day they work together in freedom, ruled by the laws
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        of nature and open standards, to show the beauty of its existence."
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        2.67.2.1 Repository layout

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        The repository layout describes organization of files and directories

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        inside the repository. The repository layout provides the standard
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        backend required for automation scripts to work correctly. If such
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        layout changes unexpectedly, automation scripts may confuse themselves
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        and stop doing what we expect from them to do.
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        As convenction, inside CentOS Artwork Repository, we organize files

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        and directories related to CentOS corporate visual identity under
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        three top level directories named: <tt>`trunk/'</tt>, <tt>`branches/'</tt>,
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        and <tt>`tags/'</tt>. 
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        The <tt>`trunk/'</tt> directory (see section The <tt>`trunk'</tt> Directory) organizes the main

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        development line of CentOS corporate visual identity. Inside
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        <tt>`trunk/'</tt> directory structure, the CentOS corporate visual
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        identity concepts are implemented using directories.  There is one
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        directory level for each relevant concept inside the repository. The
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        <tt>`trunk/'</tt> directory structure is mainly used to perform
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        development tasks related to CentOS corporate visual identity.
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        The <tt>`branches/'</tt> directory () oranizes

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        parallel development lines to <tt>`trunk/'</tt> directory. The
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        <tt>`branches/'</tt> directory is used to set points in time where
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        develpment lines are devided one from another taking separte and
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        idependent lives that share a common past from the point they were
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        devided on. The <tt>`branches/'</tt> directory is mainly used to perform
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        quality assurance tasks related to CentOS corporate visual identity.
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        The <tt>`tags/'</tt> directory (see section The <tt>`tags'</tt> Directory) organizes parallel frozen

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        lines to <tt>`branches/'</tt> directory.  The parallel frozen lines are
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        immutable, nothing change inside them once they has been created.  The
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        <tt>`tags/'</tt> directory is mainly used to publish final releases of
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        CentOS corporate visual identity.
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        The CentOS Artwork Repository layout is firmly grounded on a

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        Subversion base.  Subversion (http://subversion.tigris.org) is a
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        version control system, which allows you to keep old versions of files
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        and directories (usually source code), keep a log of who, when, and
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        why changes occurred, etc., like CVS, RCS or SCCS.  Subversion keeps a
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        single copy of the master sources.  This copy  is called the source
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        "repository"; it contains all the information to permit extracting
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        previous versions of those files at any time.
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        2.67.2.2 Repository name convenctions

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        Repository name convenctions help us to maintain consistency of names

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        inside the repository.
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        Repository name convenctions are applied to files and directories

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        inside the repository layout. As convenction, inside the repository
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        layout, file names are all written in lowercase
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        (<samp>`01-welcome.png'</samp>, <samp>`splash.png'</samp>, <samp>`anaconda_header.png'</samp>,
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        etc.) and directory names are all written capitalized (e.g.,
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        <samp>`Identity'</samp>, <samp>`Themes'</samp>, <samp>`Motifs'</samp>, <samp>`TreeFlower'</samp>,
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        etc.).
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        Repository name convenctions are implemented inside the

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        cli_getRepoName function of <tt>`centos-art.sh'</tt> script. With
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        cli_getRepoName function we reduce the amount of commands and
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        convenctions to remember, concentrating them in just one single place
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        to look for fixes and improvements.
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        2.67.2.3 Repository work flow

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        Repository work flow describes the steps and time intervals used to

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        produce CentOS corporate visual identity inside CentOS Artwork
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        Repository.  
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        To illustrate repository work flow let's consider themes' development

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        cycle. 
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        Initially, we start working themes on their trunk development line

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        (e.g., <tt>`trunk/Identity/Themes/Motifs/TreeFlower/'</tt>), here we
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        organize information that cannot be produced automatically (i.e.,
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        background images, concepts, color information, screenshots, etc.).
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        Later, when theme trunk development line is considered "ready" for

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        implementation (e.g.,  all required backgrounds have been designed),
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        we create a branch for it (e.g.,
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        <tt>`branches/Identity/Themes/Motifs/TreeFlower/1/'</tt>).  Once the
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        branch has been created, we forget that branch and continue working
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        the trunk development line while others (e.g., an artwork quality
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        assurance team) test the new branch for tunning it up. 
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        Once the branch has been tunned up, and considered "ready" for

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        release, it is freezed under <tt>`tags/'</tt> directory (e.g.,
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        <tt>`tags/Identity/Themes/Motifs/TreeFower/1.0/'</tt>) for packagers,
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        webmasters, promoters, and anyone who needs images from that CentOS
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        theme the tag was created for.
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        Both branches and tags, inside CentOS Artwork Repository, use

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        numerical values to identify themselves under the same location.
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        Branches start at one (i.e., <samp>`1'</samp>) and increment one unit for each
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        branch created from the same trunk development line.  Tags start at
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        zero (i.e., <samp>`0'</samp>) and increment one unit for each tag created from
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        the same branch development line.
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        Convenction

        Convenction

        Do not freeze trunk development lines using tags

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        directly.  If you think you need to freeze a trunk development line,
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        create a branch for it and then freeze that branch instead.
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        The trunk development line may introduce problems we cannot see

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        immediatly. Certainly, the high changable nature of trunk development
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        line complicates finding and fixing such problems. On the other hand,
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        the branched development lines provide a more predictable area where
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        only fixes/corrections to current content are commited up to
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        repository. 
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        If others find and fix bugs inside the branched development line, we

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        could merge such changes/experiences back to trunk development line
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        (not visversa) in order for future branches, created from trunk, to
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        benefit.
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        Time intervals used to create branches and tags may vary, just as

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        different needs may arrive. For example, consider the release schema
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        of CentOS distribution: one major release every 2 years, security
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        updates every 6 months, support for 7 years long. Each time a CentOS
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        distribution is released, specially if it is a major release, there is
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        a theme need in order to cover CentOS distribution artwork
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        requirements. At this point, is where CentOS Artwork Repository comes
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        up to scene. 
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        Before releasing a new major release of CentOS distribution we create

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        a branch for one of several theme development lines available inside
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        the CentOS Artwork Repository, perform quality assurance on it, and
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        later, freeze that branch using tags. Once a the theme branch has been
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        frozen (under <tt>`tags/'</tt> directory), CentOS Packagers (the persons
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        whom build CentOS distribution) can use that frozen branch as source
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        location to fulfill CentOS distribution artwork needs. The same
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        applies to CentOS Webmasters (the persons whom build CentOS websites),
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        and any other visual manifestation required by the project.
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        2.67.2.4 Parallel directories

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        Inside CentOS Artwork Repository, parallel directories are simple

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        directory entries built from a common parent directory and placed in a
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        location different to that, the common parent directory is placed on.
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        Parallel directories are useful to create branches, tags,
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        translations, documentation, pre-rendering configuration script, and
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        similar directory structures.
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        Parallel directories take their structure from one unique parent

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        directory. Inside CentOS Artwork Repository, this unique parent
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        directory is under <tt>`trunk/Identity'</tt> location.  The
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        <tt>`trunk/Identity'</tt> location must be considered the reference for
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        whatever information you plan to create inside the repository.
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        In some circumstances, parallel directories may be created removing

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        uncommon information from their paths. Uncommon path information
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        refers to those directory levels in the path which are not common for
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        other parallel directories.  For example, when rendering
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        <tt>`trunk/Identity/Themes/Motifs/TreeFlower/Distro'</tt> directory
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        structure, the <tt>`centos-art.sh'</tt> script removes the
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        <tt>`Motifs/TreeFlower/'</tt> directory levels from path, in order to
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        build the parallel directory used to retrived translations, and
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        pre-rendering configuration scripts required by render
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        functionality.
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        Another example of parallel directory is the documentation structure

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        created by manual functionality. This time,
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        <tt>`centos-art.sh'</tt> script uses parallel directory information with
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        uncommon directory levels to build the documentation entry required by
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        Texinfo documentation system, inside the repository.
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        Othertimes, parallel directories may add uncommon information to their

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        paths. This is the case we use to create branches and tags. When we
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        create branches and tags, a numerical identifier is added to parallel
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        directory structure path. The place where the numerical identifier is
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        set on is relevant to corporate visual identity structure and should
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        be carefully considered where it will be.
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        When one parent directory changes, all their related parallel

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        directories need to be changed too. This is required in order for
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        parallel directories to retain their relation with the parent
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        directory structure.  In the other hand, parallel directories should
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        never be modified under no reason but to satisfy the relation to their
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        parent directory structure.  Liberal change of parallel directories
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        may suppresses the conceptual idea they were initially created for;
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        and certainly, things may stop working the way they should do.
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        2.67.2.5 Syncronizing path information

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        Parallel directories are very useful to keep repository organized but

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        introduce some complications.  For instance, consider what would
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        happen to functionalities like manual (<samp>`trunk Scripts Bash
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        Functions Manual'</samp>) that rely on parent directory structures to create
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        documentation entries (using parallel directory structures) if one of
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        those parent directory structures suddenly changes after the
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        documentation entry has been already created for it? 
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        In such cases, functionalities like manual may confuse

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        themselves if path information is not updated to reflect the relation
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        with its parent directory.  Such functionalities work with parent
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        directory structure as reference; if a parent directory changes, the
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        functionalities dont't even note it because they work with the last
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        parent directory structure available in the repository, no matter what
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        it is. 
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        In the specific case of documentation (the manual

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        functionality), the problem mentioned above provokes that older parent
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        directories, already documented, remain inside documentation directory
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        structures as long as you get your hands into the documentation
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        directory structure (<tt>`trunk/Manuals'</tt>) and change what must be
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        changed to match the new parent directory structure.
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        There is no immediate way for manual, and similar

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        functionalities that use parent directories as reference, to know when
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        and how directory movements take place inside the repository. Such
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        information is available only when the file movement itself takes
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        place inside the repository. So, is there, at the moment of moving
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        files, when we need to syncronize parallel directories with their
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        unique parent directory structure.
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        Warning

        Warning

        There is not support for URL reference inside

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        <tt>`centos-art.sh'</tt> script.  The <tt>`centos-art.sh'</tt> script is
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        designed to work with local files inside the working copy only.
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        As CentOS Artwork Repository is built over a version control system,

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        file movements inside the repository are considered repository
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        changes. In order for these repository changes to be versioned, we
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        need to, firstly, add changes into the version control system, commit
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        them, and later, perform movement actions using version control system
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        commands. This configuration makes possible for everyone to know about
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        changes details inside the repository; and if needed, revert or update
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        them back to a previous revision.
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        Finally, once all path information has been corrected, it is time to

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        take care of information inside the files. For instance, considere
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        what would happen if you make a reference to a documentation node, and
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        later the documentation node you refere to is deleted. That would make
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        Texinfo to produce error messages at export time. So, the
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        <tt>`centos-art.sh'</tt> script needs to know when such changes happen, in
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        a way they could be noted and handled without producing errors.
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        2.67.2.6 What is the right place to store it?

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        Occasionly, you may find that new corporate visual identity components

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        need to be added to the repository. If that is your case, the first
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        question you need to ask yourself, before start to create directories
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        blindly all over, is: What is the right place to store it?
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        The CentOS Community different free support vains (see:

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        http://wiki.centos.org/GettingHelp) are the best place to find
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        answers to your question, but going there with hands empty is not good
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        idea. It may give the impression you don't really care about. Instead,
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        consider the following suggestions to find your own comprehension and
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        so, make your propositions based on it.
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        When we are looking for the correct place to store new files, to bear

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        in mind the corporate visual identity structure used inside the CentOS
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        Artwork Repository (see section The <tt>`trunk/Identity'</tt> Directory) would be probaly the best
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        advice we could offer, the rest is just matter of choosing appropriate
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        names.  To illustrate this desition process let's consider the
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        <tt>`trunk/Identity/Themes/Motifs/TreeFlower'</tt> directory as example.
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        It is the trunk development line of TreeFlower artistic motif.
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        Artistic motifs are considered part of themes, which in turn are
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        considered part of CentOS corporate visual identity.
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        When building parent directory structures, you may find that reaching

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        an acceptable location may take some time, and as it uses to happen
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        most of time; once you've find it, that may be not a definite
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        solution.  There are many concepts that you need to play with, in
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        order to find a result that match the conceptual idea you try to
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        implement in the new directory location. To know which these concepts
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        are, split the location in words and read its documentation entry from
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        less specific to more specific.
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        For example, the <tt>`trunk/Identity/Themes/Motifs/TreeFlower'</tt>

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        location evolved through several months of contant work and there is
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        no certain it won't change in the future, even it fixes quite well the
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        concept we are trying to implement.  The concepts used in
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        <tt>`trunk/Identity/Themes/Distro/Motifs/TreeFlower'</tt> location are
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        described in the following commands, respectively:
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        centos-art manual --read=turnk/
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        centos-art manual --read=turnk/Identity/
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        centos-art manual --read=turnk/Identity/Themes/
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        centos-art manual --read=turnk/Identity/Themes/Motifs/
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        centos-art manual --read=turnk/Identity/Themes/Motifs/TreeFlower/
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        Other location concepts can be found similary as we did above, just

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        change the location we used above by the one you are trying to know
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        concepts for.
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        2.67.3 Usage

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        centos-art path --copy='SRC' --to='DST'
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        Copy <samp>`SRC'</samp> to <samp>`DST'</samp> and schedule <samp>`DST'</samp> for

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        addition (with history).  In this command, <tt>`SRC'</tt> and <tt>`DST'</tt>
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        are both working copy (WC) entries.
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        centos-art path --delete='SRC'
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        Delete <samp>`DST'</samp>. In order for this command to work the file or

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        directory you intend to delete should be under version control first.
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        In this command, <tt>`SRC'</tt> is a working copy (WC) entry.  
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        2.67.4 See also

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        [Contents]
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        [Index]
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        [ ? ]
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