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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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>Package Structure</TITLE
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><A
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>Chapter 29. Managing the Package Repository</TD
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><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="PACKAGE-STRUCTURE">Package Structure</H1
><P
>The files in an installed <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> source tree are organized in
a natural tree structure, grouping together files which work together
into <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Packages</I
></SPAN
>. For example, the kernel files
are all together in: </P
><P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
><TT
CLASS="FILENAME"
><TT
CLASS="REPLACEABLE"
><I
>BASE_DIR</I
></TT
>/kernel/<TT
CLASS="REPLACEABLE"
><I
>&#60;version&#62;</I
></TT
>/include/</TT
></TD
></TR
><TR
><TD
>           <TT
CLASS="FILENAME"
><TT
CLASS="REPLACEABLE"
><I
>BASE_DIR</I
></TT
>/kernel/<TT
CLASS="REPLACEABLE"
><I
>&#60;version&#62;</I
></TT
>/src/</TT
></TD
></TR
><TR
><TD
>       <TT
CLASS="FILENAME"
><TT
CLASS="REPLACEABLE"
><I
>BASE_DIR</I
></TT
>/kernel/<TT
CLASS="REPLACEABLE"
><I
>&#60;version&#62;</I
></TT
>/tests/</TT
></TD
></TR
></TBODY
></TABLE
><P
></P
><P
>and &micro;ITRON compatibility layer files are in:
        </P
><P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
>           <TT
CLASS="FILENAME"
><TT
CLASS="REPLACEABLE"
><I
>BASE_DIR</I
></TT
>/compat/uitron/<TT
CLASS="REPLACEABLE"
><I
>&#60;version&#62;</I
></TT
>/include/</TT
></TD
></TR
><TR
><TD
>       <TT
CLASS="FILENAME"
><TT
CLASS="REPLACEABLE"
><I
>BASE_DIR</I
></TT
>/compat/uitron/<TT
CLASS="REPLACEABLE"
><I
>&#60;version&#62;</I
></TT
>/src/</TT
></TD
></TR
><TR
><TD
>       <TT
CLASS="FILENAME"
><TT
CLASS="REPLACEABLE"
><I
>BASE_DIR</I
></TT
>/compat/uitron/<TT
CLASS="REPLACEABLE"
><I
>&#60;version&#62;</I
></TT
>/tests/</TT
></TD
></TR
></TBODY
></TABLE
><P
></P
><P
>The feature of these names which is of interest here is
          the <TT
CLASS="REPLACEABLE"
><I
>&#60;version&#62;</I
></TT
> near the end. It may seem odd to place a version number deep in the
          path, rather than having something like
          <TT
CLASS="FILENAME"
><TT
CLASS="REPLACEABLE"
><I
>BASE_DIR</I
></TT
>/<TT
CLASS="REPLACEABLE"
><I
>&#60;version&#62;</I
></TT
>/...everything...</TT
>
          or leaving it up to you to choose a different
          install-place when a new release of the system arrives.
        </P
><P
>There is a rationale for this organization: as
          indicated, the kernel and the
          &micro;ITRON compatibility subsystem
          are examples of software packages. For the first few
          releases of <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
>, all the packages will move along
          in step, i.e. Release 1.3.x will feature Version
          1.3.x of every package, and so forth. But in future,
          especially when third party packages become available, it is
          intended that the package be the unit of software
          distribution, so it will be possible to build a system from
          a selection of packages with different version numbers, and
          even differing versioning <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>schemes</I
></SPAN
>. A
          Tcl script <B
CLASS="COMMAND"
>ecosadmin.tcl</B
> is
          provided in the <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> repository to manage the installation
          and removal of packages in this way.</P
><P
>Many users will have their own source code control system,
version control system or equivalent, and will want to use it with
<SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> sources. In that case, since a new release of <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> comes with
different pathnames for all the source files, a bit of work is necessary
to import a new release into your source repository. </P
><P
>One way of handling the import is to rename all the version
parts to some common name, for example &#8220;current&#8221;,
and continue to work. &#8220;current&#8221; is suggested because <B
CLASS="COMMAND"
>ecosconfig</B
> recognizes
it and places it first in any list of versions. In the future, we
may provide a tool to help with this, or an option in the install
wizard. Alternatively, in a POSIX shell environment (Linux or Cygwin
on Windows) use the following command: </P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>find . -name <TT
CLASS="REPLACEABLE"
><I
>&#60;version&#62;</I
></TT
> -type d -printf 'mv &#0037;p &#0037;h/current\n' | sh</PRE
></TD
></TR
></TABLE
><P
>Having carried out such a renaming operation, your
          source tree will now look like this: </P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
><TT
CLASS="REPLACEABLE"
><I
>BASE_DIR</I
></TT
>/kernel/current/include/
<TT
CLASS="REPLACEABLE"
><I
>BASE_DIR</I
></TT
>/kernel/current/src/
<TT
CLASS="REPLACEABLE"
><I
>BASE_DIR</I
></TT
>/kernel/current/tests/
        ...
<TT
CLASS="REPLACEABLE"
><I
>BASE_DIR</I
></TT
>/compat/uitron/current/include/
<TT
CLASS="REPLACEABLE"
><I
>BASE_DIR</I
></TT
>/compat/uitron/current/src/
<TT
CLASS="REPLACEABLE"
><I
>BASE_DIR</I
></TT
>/compat/uitron/current/tests/
        </PRE
></TD
></TR
></TABLE
><P
>which is a suitable format for import into your own
          source code control system. When you get a subsequent
          release of <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
>, do the same thing and use your own source
          code control system to manage the new source base, by
          importing the new version from </P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
><TT
CLASS="REPLACEABLE"
><I
>NEW_BASE_DIR</I
></TT
>/kernel/current/include/</PRE
></TD
></TR
></TABLE
><P
>and so on. </P
><P
>The <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> build tool will now offer only the
          &#8220;current&#8221; version of each package; select this
          for the packages you wish to use. </P
><P
>Making such a change has implications for any build
          trees you already have in use. A configured build tree
          contains information about the selected packages and their
          selected versions. Changing the name of the
          &#8220;versioning&#8221; folder in the source tree
          invalidates this information, and in consequence it also
          invalidates any local configuration options you have set up
          in this build tree. So if you want to change the version
          information in the source tree, do it first, before
          investing any serious time in configuring and building your
          system. When you create a new build tree to deal with the
          new source layout, it will contain default settings for all
          the configuration options, just like the old build tree did
          before you configured it. You will need to redo that
          configuration work in the new tree. </P
><P
>Moving source code around also invalidates debugging information
in any programs or libraries built from the old tree; these will
need to be rebuilt. </P
></DIV
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Line No.	Rev	Author	Line
1	1254	phoenix	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
4			`<!-- or later (the latest version is presently available at -->`
5			`<!-- http://www.opencontent.org/openpub/). -->`
6			`<!-- Distribution of the work or derivative of the work in any -->`
7			`<!-- standard (paper) book form is prohibited unless prior -->`
8			`<!-- permission is obtained from the copyright holder. -->`
9			`<HTML`
10			`><HEAD`
11			`><TITLE`
12			`>Package Structure</TITLE`
13			`><meta name="MSSmartTagsPreventParsing" content="TRUE">`
14			`<META`
15			`NAME="GENERATOR"`
16			`CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+`
17			`"><LINK`
18			`REL="HOME"`
19			`TITLE="eCos User Guide"`
20			`HREF="ecos-user-guide.html"><LINK`
21			`REL="UP"`
22			`TITLE="Managing the Package Repository"`
23			`HREF="managing-package-repository.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="Managing the Package Repository"`
26			`HREF="managing-package-repository.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="Appendixes"`
29			`HREF="appendices.html"></HEAD`
30			`><BODY`
31			`CLASS="SECT1"`
32			`BGCOLOR="#FFFFFF"`
33			`TEXT="#000000"`
34			`LINK="#0000FF"`
35			`VLINK="#840084"`
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37			`><DIV`
38			`CLASS="NAVHEADER"`
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40			`SUMMARY="Header navigation table"`
41			`WIDTH="100%"`
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44			`CELLSPACING="0"`
45			`><TR`
46			`><TH`
47			`COLSPAN="3"`
48			`ALIGN="center"`
49			`>eCos User Guide</TH`
50			`></TR`
51			`><TR`
52			`><TD`
53			`WIDTH="10%"`
54			`ALIGN="left"`
55			`VALIGN="bottom"`
56			`><A`
57			`HREF="managing-package-repository.html"`
58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`>Chapter 29. Managing the Package Repository</TD`
66			`><TD`
67			`WIDTH="10%"`
68			`ALIGN="right"`
69			`VALIGN="bottom"`
70			`><A`
71			`HREF="appendices.html"`
72			`ACCESSKEY="N"`
73			`>Next</A`
74			`></TD`
75			`></TR`
76			`></TABLE`
77			`><HR`
78			`ALIGN="LEFT"`
79			`WIDTH="100%"></DIV`
80			`><DIV`
81			`CLASS="SECT1"`
82			`><H1`
83			`CLASS="SECT1"`
84			`><A`
85			`NAME="PACKAGE-STRUCTURE">Package Structure</H1`
86			`><P`
87			`>The files in an installed <SPAN`
88			`CLASS="PRODUCTNAME"`
89			`>eCos</SPAN`
90			`> source tree are organized in`
91			`a natural tree structure, grouping together files which work together`
92			`into <SPAN`
93			`CLASS="emphasis"`
94			`><I`
95			`CLASS="EMPHASIS"`
96			`>Packages</I`
97			`></SPAN`
98			`>. For example, the kernel files`
99			`are all together in: </P`
100			`><P`
101			`></P`
102			`><TABLE`
103			`BORDER="0"`
104			`><TBODY`
105			`><TR`
106			`><TD`
107			`><TT`
108			`CLASS="FILENAME"`
109			`><TT`
110			`CLASS="REPLACEABLE"`
111			`><I`
112			`>BASE_DIR</I`
113			`></TT`
114			`>/kernel/<TT`
115			`CLASS="REPLACEABLE"`
116			`><I`
117			`><version></I`
118			`></TT`
119			`>/include/</TT`
120			`></TD`
121			`></TR`
122			`><TR`
123			`><TD`
124			`> <TT`
125			`CLASS="FILENAME"`
126			`><TT`
127			`CLASS="REPLACEABLE"`
128			`><I`
129			`>BASE_DIR</I`
130			`></TT`
131			`>/kernel/<TT`
132			`CLASS="REPLACEABLE"`
133			`><I`
134			`><version></I`
135			`></TT`
136			`>/src/</TT`
137			`></TD`
138			`></TR`
139			`><TR`
140			`><TD`
141			`> <TT`
142			`CLASS="FILENAME"`
143			`><TT`
144			`CLASS="REPLACEABLE"`
145			`><I`
146			`>BASE_DIR</I`
147			`></TT`
148			`>/kernel/<TT`
149			`CLASS="REPLACEABLE"`
150			`><I`
151			`><version></I`
152			`></TT`
153			`>/tests/</TT`
154			`></TD`
155			`></TR`
156			`></TBODY`
157			`></TABLE`
158			`><P`
159			`></P`
160			`><P`
161			`>and µITRON compatibility layer files are in:`
162			`</P`
163			`><P`
164			`></P`
165			`><TABLE`
166			`BORDER="0"`
167			`><TBODY`
168			`><TR`
169			`><TD`
170			`> <TT`
171			`CLASS="FILENAME"`
172			`><TT`
173			`CLASS="REPLACEABLE"`
174			`><I`
175			`>BASE_DIR</I`
176			`></TT`
177			`>/compat/uitron/<TT`
178			`CLASS="REPLACEABLE"`
179			`><I`
180			`><version></I`
181			`></TT`
182			`>/include/</TT`
183			`></TD`
184			`></TR`
185			`><TR`
186			`><TD`
187			`> <TT`
188			`CLASS="FILENAME"`
189			`><TT`
190			`CLASS="REPLACEABLE"`
191			`><I`
192			`>BASE_DIR</I`
193			`></TT`
194			`>/compat/uitron/<TT`
195			`CLASS="REPLACEABLE"`
196			`><I`
197			`><version></I`
198			`></TT`
199			`>/src/</TT`
200			`></TD`
201			`></TR`
202			`><TR`
203			`><TD`
204			`> <TT`
205			`CLASS="FILENAME"`
206			`><TT`
207			`CLASS="REPLACEABLE"`
208			`><I`
209			`>BASE_DIR</I`
210			`></TT`
211			`>/compat/uitron/<TT`
212			`CLASS="REPLACEABLE"`
213			`><I`
214			`><version></I`
215			`></TT`
216			`>/tests/</TT`
217			`></TD`
218			`></TR`
219			`></TBODY`
220			`></TABLE`
221			`><P`
222			`></P`
223			`><P`
224			`>The feature of these names which is of interest here is`
225			`the <TT`
226			`CLASS="REPLACEABLE"`
227			`><I`
228			`><version></I`
229			`></TT`
230			`> near the end. It may seem odd to place a version number deep in the`
231			`path, rather than having something like`
232			`<TT`
233			`CLASS="FILENAME"`
234			`><TT`
235			`CLASS="REPLACEABLE"`
236			`><I`
237			`>BASE_DIR</I`
238			`></TT`
239			`>/<TT`
240			`CLASS="REPLACEABLE"`
241			`><I`
242			`><version></I`
243			`></TT`
244			`>/...everything...</TT`
245			`>`
246			`or leaving it up to you to choose a different`
247			`install-place when a new release of the system arrives.`
248			`</P`
249			`><P`
250			`>There is a rationale for this organization: as`
251			`indicated, the kernel and the`
252			`µITRON compatibility subsystem`
253			`are examples of software packages. For the first few`
254			`releases of <SPAN`
255			`CLASS="PRODUCTNAME"`
256			`>eCos</SPAN`
257			`>, all the packages will move along`
258			`in step, i.e. Release 1.3.x will feature Version`
259			`1.3.x of every package, and so forth. But in future,`
260			`especially when third party packages become available, it is`
261			`intended that the package be the unit of software`
262			`distribution, so it will be possible to build a system from`
263			`a selection of packages with different version numbers, and`
264			`even differing versioning <SPAN`
265			`CLASS="emphasis"`
266			`><I`
267			`CLASS="EMPHASIS"`
268			`>schemes</I`
269			`></SPAN`
270			`>. A`
271			`Tcl script <B`
272			`CLASS="COMMAND"`
273			`>ecosadmin.tcl</B`
274			`> is`
275			`provided in the <SPAN`
276			`CLASS="PRODUCTNAME"`
277			`>eCos</SPAN`
278			`> repository to manage the installation`
279			`and removal of packages in this way.</P`
280			`><P`
281			`>Many users will have their own source code control system,`
282			`version control system or equivalent, and will want to use it with`
283			`<SPAN`
284			`CLASS="PRODUCTNAME"`
285			`>eCos</SPAN`
286			`> sources. In that case, since a new release of <SPAN`
287			`CLASS="PRODUCTNAME"`
288			`>eCos</SPAN`
289			`> comes with`
290			`different pathnames for all the source files, a bit of work is necessary`
291			`to import a new release into your source repository. </P`
292			`><P`
293			`>One way of handling the import is to rename all the version`
294			`parts to some common name, for example “current”,`
295			`and continue to work. “current” is suggested because <B`
296			`CLASS="COMMAND"`
297			`>ecosconfig</B`
298			`> recognizes`
299			`it and places it first in any list of versions. In the future, we`
300			`may provide a tool to help with this, or an option in the install`
301			`wizard. Alternatively, in a POSIX shell environment (Linux or Cygwin`
302			`on Windows) use the following command: </P`
303			`><TABLE`
304			`BORDER="5"`
305			`BGCOLOR="#E0E0F0"`
306			`WIDTH="70%"`
307			`><TR`
308			`><TD`
309			`><PRE`
310			`CLASS="SCREEN"`
311			`>find . -name <TT`
312			`CLASS="REPLACEABLE"`
313			`><I`
314			`><version></I`
315			`></TT`
316			`> -type d -printf 'mv %p %h/current\n' \| sh</PRE`
317			`></TD`
318			`></TR`
319			`></TABLE`
320			`><P`
321			`>Having carried out such a renaming operation, your`
322			`source tree will now look like this: </P`
323			`><TABLE`
324			`BORDER="5"`
325			`BGCOLOR="#E0E0F0"`
326			`WIDTH="70%"`
327			`><TR`
328			`><TD`
329			`><PRE`
330			`CLASS="SCREEN"`
331			`><TT`
332			`CLASS="REPLACEABLE"`
333			`><I`
334			`>BASE_DIR</I`
335			`></TT`
336			`>/kernel/current/include/`
337			`<TT`
338			`CLASS="REPLACEABLE"`
339			`><I`
340			`>BASE_DIR</I`
341			`></TT`
342			`>/kernel/current/src/`
343			`<TT`
344			`CLASS="REPLACEABLE"`
345			`><I`
346			`>BASE_DIR</I`
347			`></TT`
348			`>/kernel/current/tests/`
349			`...`
350			`<TT`
351			`CLASS="REPLACEABLE"`
352			`><I`
353			`>BASE_DIR</I`
354			`></TT`
355			`>/compat/uitron/current/include/`
356			`<TT`
357			`CLASS="REPLACEABLE"`
358			`><I`
359			`>BASE_DIR</I`
360			`></TT`
361			`>/compat/uitron/current/src/`
362			`<TT`
363			`CLASS="REPLACEABLE"`
364			`><I`
365			`>BASE_DIR</I`
366			`></TT`
367			`>/compat/uitron/current/tests/`
368			`</PRE`
369			`></TD`
370			`></TR`
371			`></TABLE`
372			`><P`
373			`>which is a suitable format for import into your own`
374			`source code control system. When you get a subsequent`
375			`release of <SPAN`
376			`CLASS="PRODUCTNAME"`
377			`>eCos</SPAN`
378			`>, do the same thing and use your own source`
379			`code control system to manage the new source base, by`
380			`importing the new version from </P`
381			`><TABLE`
382			`BORDER="5"`
383			`BGCOLOR="#E0E0F0"`
384			`WIDTH="70%"`
385			`><TR`
386			`><TD`
387			`><PRE`
388			`CLASS="SCREEN"`
389			`><TT`
390			`CLASS="REPLACEABLE"`
391			`><I`
392			`>NEW_BASE_DIR</I`
393			`></TT`
394			`>/kernel/current/include/</PRE`
395			`></TD`
396			`></TR`
397			`></TABLE`
398			`><P`
399			`>and so on. </P`
400			`><P`
401			`>The <SPAN`
402			`CLASS="PRODUCTNAME"`
403			`>eCos</SPAN`
404			`> build tool will now offer only the`
405			`“current” version of each package; select this`
406			`for the packages you wish to use. </P`
407			`><P`
408			`>Making such a change has implications for any build`
409			`trees you already have in use. A configured build tree`
410			`contains information about the selected packages and their`
411			`selected versions. Changing the name of the`
412			`“versioning” folder in the source tree`
413			`invalidates this information, and in consequence it also`
414			`invalidates any local configuration options you have set up`
415			`in this build tree. So if you want to change the version`
416			`information in the source tree, do it first, before`
417			`investing any serious time in configuring and building your`
418			`system. When you create a new build tree to deal with the`
419			`new source layout, it will contain default settings for all`
420			`the configuration options, just like the old build tree did`
421			`before you configured it. You will need to redo that`
422			`configuration work in the new tree. </P`
423			`><P`
424			`>Moving source code around also invalidates debugging information`
425			`in any programs or libraries built from the old tree; these will`
426			`need to be rebuilt. </P`
427			`></DIV`
428			`><DIV`
429			`CLASS="NAVFOOTER"`
430			`><HR`
431			`ALIGN="LEFT"`
432			`WIDTH="100%"><TABLE`
433			`SUMMARY="Footer navigation table"`
434			`WIDTH="100%"`
435			`BORDER="0"`
436			`CELLPADDING="0"`
437			`CELLSPACING="0"`
438			`><TR`
439			`><TD`
440			`WIDTH="33%"`
441			`ALIGN="left"`
442			`VALIGN="top"`
443			`><A`
444			`HREF="managing-package-repository.html"`
445			`ACCESSKEY="P"`
446			`>Prev</A`
447			`></TD`
448			`><TD`
449			`WIDTH="34%"`
450			`ALIGN="center"`
451			`VALIGN="top"`
452			`><A`
453			`HREF="ecos-user-guide.html"`
454			`ACCESSKEY="H"`
455			`>Home</A`
456			`></TD`
457			`><TD`
458			`WIDTH="33%"`
459			`ALIGN="right"`
460			`VALIGN="top"`
461			`><A`
462			`HREF="appendices.html"`
463			`ACCESSKEY="N"`
464			`>Next</A`
465			`></TD`
466			`></TR`
467			`><TR`
468			`><TD`
469			`WIDTH="33%"`
470			`ALIGN="left"`
471			`VALIGN="top"`
472			`>Managing the Package Repository</TD`
473			`><TD`
474			`WIDTH="34%"`
475			`ALIGN="center"`
476			`VALIGN="top"`
477			`><A`
478			`HREF="managing-package-repository.html"`
479			`ACCESSKEY="U"`
480			`>Up</A`
481			`></TD`
482			`><TD`
483			`WIDTH="33%"`
484			`ALIGN="right"`
485			`VALIGN="top"`
486			`>Appendixes</TD`
487			`></TR`
488			`></TABLE`
489			`></DIV`
490			`></BODY`
491			`></HTML`
492			`>`

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