Maemo-releases
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| - | |colspan="5" style="border:1px solid;" | Example: <code>foo | maemo-release (< | + | |colspan="5" style="border:1px solid;" | Example: <code>foo | maemo-release (< 3.0.0) | maemo-release (> 4.0.0)</code> |
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| align="center" style="background:red; color:white" colspan="2" | foo is absent | | align="center" style="background:red; color:white" colspan="2" | foo is absent | ||
Revision as of 13:32, 29 October 2009
The rationale behind maemo-release
The maemo-release package seeks to address the situation wherein a source package is forked into gregale/bora/chinook/diablo/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 debian/control file for the various distributions, which in turn forces one to make a different debian/changelog 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 debian/control entry.
Example: Suppose Bora and Diablo contain package foo, but the other distributions do not. The corresponding debian/control Build-Depends entry will be:
Build-Depends: package1-dev, package2-dev, ..., foo | maemo-release (= 1.0.0) | maemo-release (= 3.0.0) | maemo-release (= 5.0.0), ..., packagen-dev
This way you can describe intervals of distributions wherein a certain package has become available. Examples:
| (1.0.0) Gregale | (2.0.0) Bora | (3.0.0) Chinook | (4.0.0) Diablo | (5.0.0) Fremantle |
|---|---|---|---|---|
Example: foo | maemo-release (< 3.0.0)
| ||||
| foo is absent | foo is present | |||
Example: foo | maemo-release (< 3.0.0) | maemo-release (> 4.0.0)
| ||||
| foo is absent | foo is present | foo is absent | ||
Example: foo | maemo-release (= 1.0.0) | maemo-release (= 3.0.0) | maemo-release (= 5.0.0)
| ||||
| foo is absent | foo is present | foo is absent | foo is present | 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.