📄 managing-package-repository.html
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>Managing the Package Repository</TITLE
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><DIV
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><H1
><A
NAME="MANAGING-PACKAGE-REPOSITORY">Chapter 29. Managing the Package Repository</H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="managing-package-repository.html#PACKAGE-INSTALLATION"
>Package Installation</A
></DT
><DT
><A
HREF="package-structure.html"
>Package Structure</A
></DT
></DL
></DIV
><P
>A source distribution of <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> consists of a number of
packages, such as the kernel, the C library, and the
µITRON subsystems. These are
individually versioned in the tree structure of the source
code, to support distribution on a per-package basis and to
support third party packages whose versioning systems might be
different. The <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> <SPAN
CLASS="APPLICATION"
>Package
Administration Tool</SPAN
> is used to manage the
installation and removal of packages from a variety of sources
with potentially multiple versions.</P
><P
>The presence of the version information in the source tree
structure might be a hindrance to the use of a separate source
control system such as <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>CVS</I
></SPAN
> or
<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>SourceSafe</I
></SPAN
>. To work
in this way, you can rename all the version components to some
common name (such as “current”) thus unifying the
structure of source trees from distinct <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> releases.</P
><P
>The <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> build system will treat any such name as just another
version of the package(s), and support building in exactly the same
way. However, performing this rename invalidates any existing build
trees that referred to the versioned source tree, so do the rename
first, before any other work, and do a complete rebuild afterwards.</P
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="PACKAGE-INSTALLATION">Package Installation</H1
><P
>Package installation and removal is performed using the
<SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> <SPAN
CLASS="APPLICATION"
>Package Administration Tool</SPAN
>. This
tool is a Tcl script named
<B
CLASS="COMMAND"
>ecosadmin.tcl</B
> which allows
the user to add new <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> packages and new versions of
existing packages to an <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> repository. Such packages must
be distributed as a single file in the <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> package
distribution format. Unwanted packages may also be removed
from the repository using this tool. A graphical version of
the tool is provided as part of the
<SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> <SPAN
CLASS="APPLICATION"
>Configuration Tool</SPAN
>.</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN3069">Using the Administration Tool</H2
><P
>The graphical
version of the <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> <SPAN
CLASS="APPLICATION"
>Package
Administration Tool</SPAN
>, provided as part of the
<SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> <SPAN
CLASS="APPLICATION"
>Configuration
Tool</SPAN
>, provides functions equivalent to the command-line
version for those who prefer a Windows-based interface.</P
><P
>It may be invoked in one of two ways:</P
><P
></P
><UL
><LI
><P
>from the <SPAN
CLASS="GUIMENU"
>start menu</SPAN
> (by default
<SPAN
CLASS="GUIMENUITEM"
>Start->Programs->
eCos->Package Administration
Tool</SPAN
>)</P
></LI
><LI
><P
>from the <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> <SPAN
CLASS="APPLICATION"
>Configuration
Tool</SPAN
> via the
<SPAN
CLASS="GUIMENUITEM"
>Tools->Administration</SPAN
>
menu item</P
></LI
></UL
><P
><P
><IMG
SRC="pix/admin.png"></P
></P
><P
>The main window of the tool displays the packages which are
currently installed in the form of a tree. The installed versions
of each package may be examined by expanding the tree.</P
><P
>Packages may be added to the <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> repository by clicking on
the <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Add</I
></SPAN
> button. The <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> package distribution
file to be added is then selected via a <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>File Open</I
></SPAN
> dialog
box.</P
><P
>Packages may be removed by selecting a package in the tree
and then clicking on the <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Remove</I
></SPAN
> button. If
a package node is selected, all versions of the selected package
will be removed. If a package version node is selected, only the
selected version of the package will be removed.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN3097">Using the command line</H2
><P
>The <B
CLASS="COMMAND"
>ecosadmin.tcl</B
>
script is located in the base of the <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> repository. Use
a command of the following form under versions of
UNIX:</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>$ tclsh ecosadmin.tcl <command></PRE
></TD
></TR
></TABLE
><P
>Under Windows, a command of the following form may be used
at the Cygwin command line prompt:</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>$ cygtclsh80 ecosadmin.tcl <command></PRE
></TD
></TR
></TABLE
><P
>The following commands are available:</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><B
CLASS="COMMAND"
>add <file></B
></DT
><DD
><P
>Adds the packages contained with the specified package distribution
file to the <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> repository and updates the package database accordingly.
By convention, <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> package distribution files are given the <TT
CLASS="FILENAME"
>.epk</TT
> suffix.</P
></DD
><DT
><B
CLASS="COMMAND"
>remove <package> [ --version=<version> ]</B
></DT
><DD
><P
>Removes the specified package from the <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
>
repository and updates the package database
accordingly. Where the optional version qualifier is
used, only the specified version of the package is
removed.</P
></DD
><DT
><B
CLASS="COMMAND"
>list</B
></DT
><DD
><P
>Produces a list of the packages which
are currently installed and their versions. The
available templates and hardware targets are also
listed.</P
></DD
></DL
></DIV
><P
>Note that is is possible to remove critical packages
such as the common HAL package using this tool. Users
should take care to avoid such errors since core <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
>
packages may only be re-installed in the context of a
complete re-installation of <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
>.</P
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