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<html>
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Copyright C 2009, 2010, 2011 Alain Reguera Delgado
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.2 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled GNU Free
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Documentation License.
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-->
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Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author)
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Karl Berry <karl@freefriends.org>
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Olaf Bachmann <obachman@mathematik.uni-kl.de>
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and many others.
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Maintained by: Many creative people <dev@texi2html.cvshome.org>
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Send bugs and suggestions to <users@texi2html.cvshome.org>
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-->
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<head>
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<title>The CentOS Artwork Repository: 3.42 trunk/Scripts/Bash/Functions/Path</title>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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[Top]
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[Contents]
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[Index]
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[ ? ]
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3.42 trunk/Scripts/Bash/Functions/Path
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3.42.1 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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3.42.2 Description
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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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3.42.2.1 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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Figure 3.15: The CentOS Artwork Repository layout.
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The <tt>`trunk/'</tt> directory (see section trunk) 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 (see section branches) oranizes parallel
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development lines to <tt>`trunk/'</tt> directory. The <tt>`branches/'</tt>
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directory is used to set points in time where develpment lines are
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devided one from another taking separte and idependent lives that
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share a common past from the point they were devided on. The
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<tt>`branches/'</tt> directory is mainly used to perform quality assurance
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tasks related to CentOS corporate visual identity.
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The <tt>`tags/'</tt> directory (see section tags) 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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3.42.2.2 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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3.42.2.3 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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Figure 3.16: Name convention for tags and branches creation.
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 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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3.42.2.4 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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Figure 3.17: Parallel directories removing uncommon information.
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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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Figure 3.18: Parallel directories adding uncommon information.
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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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Figure 3.19: Wrong construction of parallel directories.
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3.42.2.5 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 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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3.42.2.6 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 trunk/Identity) 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
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example. It is the trunk development line of TreeFlower's artistic
|
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motif. Artistic motifs are considered part of themes, which in turn
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are 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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|
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centos-art manual --read=turnk/
|
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|
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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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|
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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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3.42.3 Usage
|
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|
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centos-art path --copy='SRC' --to='DST'
|
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|
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|
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|
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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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|
3f9ae1 |
are both working copy (WC) entries.
|
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|
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|
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centos-art path --delete='SRC'
|
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|
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|
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Delete <samp>`DST'</samp>. In order for this command to work the file or
|
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|
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directory you intend to delete should be under version control first.
|
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|
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In this command, <tt>`SRC'</tt> is a working copy (WC) entry.
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3.42.4 See also
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3.37 trunk/Scripts/Bash
|
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|
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3.38 trunk/Scripts/Bash/Functions
|
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|
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63f275 |
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[ < ]
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[ > ]
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[ << ]
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[ Up ]
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[ >> ]
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<font size="-1">
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This document was generated on January, 6 2011 using texi2html 1.76.
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</font>
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</body>
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</html>
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