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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<HTML
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>Package Organization</TITLE
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TITLE="The eCos Component Writer's Guide"
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COLSPAN="3"
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ALIGN="center"
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>The <SPAN
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>eCos</SPAN
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> Component Writer's Guide</TH
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><TR
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><DIV
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CLASS="CHAPTER"
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><H1
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><A
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NAME="PACKAGE">Chapter 2. Package Organization</H1
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><DIV
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CLASS="TOC"
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><DL
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><DT
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><B
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>Table of Contents</B
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></DT
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><DT
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><A
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HREF="package.html#PACKAGE.HIERARCHY"
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>Packages and the Component Repository</A
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></DT
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><DT
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><A
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HREF="package.versions.html"
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>Package Versioning</A
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></DT
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><DT
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><A
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HREF="package.contents.html"
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>Package Contents and Layout</A
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></DT
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><DT
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><A
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HREF="package.distrib.html"
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>Making a Package Distribution</A
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></DT
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></DL
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></DIV
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><P
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>For a package to be usable in the <SPAN
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CLASS="APPLICATION"
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>eCos</SPAN
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> component framework it must
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conform to certain rules imposed by that framework. Packages must be
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distributed in a form that is understood by the component repository
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administration tool. There must be a top-level <SPAN
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CLASS="APPLICATION"
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>CDL</SPAN
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> script which
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describes the package to the component framework. There are certain
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limitations related to how a package gets built, so that the package
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can still be used in a variety of host environments. In addition to
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these rules, the component framework provides a number of guidelines.
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Packages do not have to conform to the guidelines, but sticking to
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them can simplify certain operations.</P
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><P
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>This chapter deals with the general organization of a package, for
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example how to distinguish between private and exported header files.
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<A
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HREF="language.html"
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>Chapter 3</A
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> describes the <SPAN
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>CDL</SPAN
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> language.
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<A
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HREF="build.html"
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>Chapter 4</A
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> details the build process.</P
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="PACKAGE.HIERARCHY">Packages and the Component Repository</H1
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><P
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>All <SPAN
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CLASS="APPLICATION"
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>eCos</SPAN
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> installations include a component repository. This is a
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directory structure for all installed packages. The component
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framework comes with an administration tool that allows new packages
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or new versions of a package to be installed, old packages to be
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removed, and so on. The component repository includes a simple
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database, maintained by the administration tool, which contains
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details of the various packages.</P
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SRC="repo.png"
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ALIGN="CENTER"></P
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><P
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>Each package has its own little directory hierarchy within the
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component repository. Keeping several packages in a single directory
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is illegal. The error, infra and kernel packages all live at the
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top-level of the repository. For other types of packages there are
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some pre-defined directories: <TT
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CLASS="FILENAME"
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>compat</TT
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> is used for compatibility
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packages, which implement other interfaces such as &micro;ITRON or POSIX
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using native <SPAN
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>eCos</SPAN
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> calls; <TT
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CLASS="FILENAME"
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>hal</TT
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>
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is used for packages that port <SPAN
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>eCos</SPAN
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> to different architectures or
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platforms, and this directory is further organized on a
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per-architecture basis; <TT
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CLASS="FILENAME"
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>io</TT
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> is
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intended for device drivers; <TT
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CLASS="FILENAME"
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>language</TT
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> is used for language support
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libraries, for example the C library. There are no strict rules
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defining where new packages should get installed. Obviously if an
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existing top-level directory such as <TT
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CLASS="FILENAME"
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>compat</TT
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> is applicable then the new package
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should go in there. If a new category is desirable then it is possible
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to create a new sub-directory in the component repository. For
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example, an organization planning to release a number of <SPAN
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CLASS="APPLICATION"
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>eCos</SPAN
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>
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packages may want them all to appear below a sub-directory
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corresponding to the organization's name&nbsp;&#8212; in the hope that
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the name will not change too often. It is possible to add new packages
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directly to the top-level of the component repository, but this should
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be avoided.</P
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><P
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>The <SPAN
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CLASS="DATABASE"
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>ecos.db</SPAN
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> file holds the component repository
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database and is managed by the administration tool. The various
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configuration tools read in this file when they start-up to obtain
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information about the various packages that have been installed. When
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developing a new package it is necessary to add some information to
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the file, as described in <A
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HREF="language.database.html"
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>the Section called <I
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>Updating the <SPAN
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CLASS="DATABASE"
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>ecos.db</SPAN
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> database</I
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> in Chapter 3</A
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>. The
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<TT
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CLASS="FILENAME"
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>templates</TT
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> directory holds
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various configuration templates.</P
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><DIV
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CLASS="NOTE"
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><BLOCKQUOTE
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><P
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><B
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>Note: </B
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>Earlier releases of <SPAN
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>eCos</SPAN
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> came with two separate files,
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<TT
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CLASS="FILENAME"
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>targets</TT
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> and <TT
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CLASS="FILENAME"
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>packages</TT
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>. The
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<SPAN
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CLASS="DATABASE"
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>ecos.db</SPAN
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> database replaces both of these.</P
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><TD
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><B
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>Caution</B
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></TD
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></TR
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><TR
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><TD
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ALIGN="LEFT"
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><P
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>The current <SPAN
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CLASS="DATABASE"
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>ecos.db</SPAN
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> database does not yet provide
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all of the information needed by the component framework. Its format
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is subject to change in future releases, and the file may be replaced
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completely if necessary. There are a number of other likely future
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developments related to the component repository and the database. The
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way targets are described is subject to change. Sometimes it is
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desirable for component writers to do their initial development in a
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directory outside the component repository, but there is no specific
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support in the framework for that yet.</P
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>&nbsp;</TD
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