Editing Maemo-releases

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== The rationale behind maemo-release ==

The maemo-release package seeks to address the situation wherein a source package is forked into gregale/bora/chinook/[[Open development/Maemo roadmap/Diablo|diablo]]/[[Open development/Maemo roadmap/Fremantle|fremantle]] versions of itself because one set of Build-Depends does not work for all distributions.

Example: Fremantle provides libgstfarsight0.10-dev, whereas previous distributions do not. pidgin needs to Build-Depend on it for voice/video support to be compiled in during the build process. However, the libgstfarsight0.10-dev package does not exist in any previous distribution.

This results in having to provide a different <code>debian/control</code> file for the various distributions, which in turn forces one to make a different <code>debian/changelog</code> file for the various distributions. At this point, different distributions have different source packages.

To prevent this one reason for forking the source package, we need the maemo-release package. Then, knowing which distribution(s) contain a needed package foo, we can create an appropriate <code>debian/control</code> entry.

Example: Suppose Bora and Diablo contain package foo, but the other distributions do not. The corresponding debian/control Build-Depends entry will be:

<pre>
Build-Depends: package1-dev, 
 package2-dev, 
 ..., 
 foo | maemo-release (= 1.0.0) | maemo-release (= 3.0.0) | maemo-release (= 5.0.0),
 ...,
 packagen-dev
</pre>

This way you can describe intervals of distributions wherein a certain package has become available. Examples:

{|style="border:1px solid;"
|-
!align="center"| &nbsp; (1.0.0) Gregale &nbsp;
!align="center"| &nbsp; (2.0.0) Bora &nbsp;
!align="center"| &nbsp; (3.0.0) Chinook &nbsp;
!align="center"| &nbsp; (4.0.0) Diablo &nbsp;
!align="center"| &nbsp; (5.0.0) Fremantle &nbsp;
|-
|colspan="5" style="border:1px solid;" | Example: <code>foo | maemo-release (< 3.0.0)</code>
|-
| align="center" style="background:red; color:white" colspan="2" | foo is absent
| align="center" style="background:green; color:white" colspan="3" | foo is present
|-
|-
|colspan="5" style="border:1px solid;" | Example: <code>foo | maemo-release (< 3.0.0) | maemo-release (> 4.0.0)</code>
|-
| align="center" style="background:red; color:white" colspan="2" | foo is absent
| align="center" style="background:green; color:white" colspan="2" | foo is present
| align="center" style="background:red; color:white" colspan="1" | foo is absent
|-
|-
|colspan="5" style="border:1px solid;" | Example: <code>foo | maemo-release (= 1.0.0) | maemo-release (= 3.0.0) | maemo-release (= 5.0.0)</code>
|-
| align="center" style="background:red; color:white" colspan="1" | foo is absent
| align="center" style="background:green; color:white" colspan="1" | foo is present
| align="center" style="background:red; color:white" colspan="1" | foo is absent
| align="center" style="background:green; color:white" colspan="1" | foo is present
| align="center" style="background:red; color:white" colspan="1" | foo is absent
|-
|}

Of course, the rest of the build process has also to be made tolerant of the presence/absence of a given package.

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Editing Maemo-releases

@@ Line 3: / Line 3: @@
 == The rationale behind maemo-release ==
-The [http://maemo.org/packages/view/maemo-release/ maemo-release package] seeks to address the situation wherein a source package is forked into gregale/bora/chinook/[[Open development/Maemo roadmap/Diablo|diablo]]/[[Open development/Maemo roadmap/Fremantle|fremantle]] versions of itself because one set of Build-Depends does not work for all distributions.
+The maemo-release package seeks to address the situation wherein a source package is forked into gregale/bora/chinook/[[Open development/Maemo roadmap/Diablo|diablo]]/[[Open development/Maemo roadmap/Fremantle|fremantle]] versions of itself because one set of Build-Depends does not work for all distributions.
 Example: Fremantle provides libgstfarsight0.10-dev, whereas previous distributions do not. pidgin needs to Build-Depend on it for voice/video support to be compiled in during the build process. However, the libgstfarsight0.10-dev package does not exist in any previous distribution.