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maven: Document access to Maven properties in Bnd instructions #5379

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Sep 26, 2022
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22 changes: 22 additions & 0 deletions maven/bnd-maven-plugin/README.md
Original file line number Diff line number Diff line change
Expand Up @@ -180,6 +180,28 @@ The plugin will by default set some OSGi bundle headers derived from [pom elemen
| `Bundle-Developers` | `developers` (child element `id` must be set on each developer) |
| `Bundle-DocURL` | `url` |

### POM Properties

The Bnd instructions can reference properties defined for the Maven project and Maven settings using the `project.` and `settings.` stems, respectively.
Other properties defined in the POM can also be referenced.

```xml
<properties>
<implementation.vendor>Acme Inc.</implementation.vendor>
</properties>
<plugin>
<groupId>biz.aQute.bnd</groupId>
<artifactId>bnd-maven-plugin</artifactId>
<configuration>
<bnd><![CDATA[
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@kwin kwin Sep 26, 2022

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@bjhargrave maybe this is not the best example, as with inline bnd instructions the replacement is actually done by Maven (https://maven.apache.org/ref/3.8.6/maven-model-builder/#model-interpolation). Only for external bnd files it is done by the bnd-maven-plugin IIUC.

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Perhaps you can make a PR to improve the example?

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Either split up the example to show both pom.xml and bnd.bnd or get rid of it alltogether I would say. But referencing https://maven.apache.org/ref/current/maven-model-builder/#model-interpolation in this context would be beneficial, as it works similarly.

Implementation-Title: ${project.name}
Implementation-Version: ${project.version}
Implementation-Vendor: ${implementation.vendor}
]]></bnd>
</configuration>
</plugin>
```

### Reproducible Builds

If the configuration parameter `outputTimestamp` is set, indicating [reproducible][1] output, this plugin will automatically use the following Bnd instructions, if not otherwise configured.
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