第谷：对 p2 元数据进行分类

Question

我正在尝试使用 Tycho 生成分类的 p2 存储库。制作基本上分为三个步骤（比较Eclipse documentation）：

1. 下载捆绑包
2. 触发 org.eclipse.equinox.p2.publisher.FeaturesAndBundlesPublisher
3. 触发 org.eclipse.equinox.p2.publisher.CategoryPublisher

我在 maven pom 文件中配置。第 1 步和第 2 步运行良好，而第 3 步失败：

Status ERROR: this code=0 publishing result null children=[Status ERROR: org.eclipse.equinox.p2.updatesite code=0 Error
generating category xml action. org.eclipse.equinox.p2.core.ProvisionException: Error reading update site file:/<path>/category.xml.]

这是我的 pom.file

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001 XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>demo</groupId>
  <artifactId>simple-p2-repository</artifactId>
  <version>0.1.0-SNAPSHOT</version>
  <name>Simple p2 repository build</name>
  <packaging>pom</packaging>

  <properties>
    <tycho-version>0.18.0</tycho-version>
  </properties>

  <build>
    <plugins>
        <!-- Step 1 -->
        <plugin>
        <artifactId>maven-dependency-plugin</artifactId>
        <executions>
          <execution>
            <id>copy-bundles-for-publishing</id>
            <phase>process-resources</phase>
            <goals>
              <goal>copy</goal>
            </goals>
            <configuration>
              <artifactItems>
                <artifactItem>
                  <groupId>org.apache.cxf</groupId>
                  <artifactId>cxf-bundle</artifactId>
                  <version>2.7.5</version>
                </artifactItem>
              </artifactItems>
              <outputDirectory>${project.basedir}/target/source/plugins</outputDirectory>
            </configuration>
          </execution>
        </executions>
      </plugin>
      <!-- Step 2 -->
      <plugin>
        <groupId>org.eclipse.tycho.extras</groupId>
        <artifactId>tycho-p2-extras-plugin</artifactId>
        <version>${tycho-version}</version>
        <executions>
          <execution>
            <phase>prepare-package</phase>
            <goals>
              <goal>publish-features-and-bundles</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
          <compress>true</compress>
          <append>true</append>
          <publishArtifacts>true</publishArtifacts>
        </configuration>
      </plugin>
      <!-- Step3 -->
      <plugin>
        <groupId>org.eclipse.tycho</groupId>
        <artifactId>tycho-p2-plugin</artifactId>
        <version>${tycho-version}</version>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>category-p2-metadata</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
          <target>${basedir}/target/repository</target>
          <categoryDefinition>${basedir}/category.xml</categoryDefinition>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

还有我的 category.xml

<?xml version="1.0" encoding="UTF-8"?>
  <site>
    <category-def name="all" label="Maven osgi-bundles"/>
    <iu>
      <category name="all"/>
      <query>
        <expression type="match">providedCapabilities.exists(p | p.namespace == 'osgi.bundle')</expression>
     </query>
   </iu>
</site>

如果我手动执行这些步骤，则会发生相同的错误。我错过了什么？

Answer 1

虽然理论上可以通过 Tycho 调用低级 p2 动作，但我不建议您尝试解决此问题。

该工件已在 Maven 存储库中可用，因此您可以通过 pomDependencies=consider 轻松将其添加到 Tycho 构建的 target platform。然后，您可以使用 Tycho 的打包类型 eclipse-repository，例如使用工件构建 p2 存储库。

您需要以下 POM 配置...

  ...
  <packaging>eclipse-repository</packaging>

  <dependencies>
    <dependency>
      <groupId>org.apache.cxf</groupId>
      <artifactId>cxf-bundle</artifactId>
      <version>2.7.5</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.eclipse.tycho</groupId>
        <artifactId>target-platform-configuration</artifactId>
        <version>${tycho-version}</version>
        <configuration>
          <pomDependencies>consider</pomDependencies>
        </configuration>
      </plugin>
    </plugins>
  </build>

... 和一个 category.xml 明确列出您想要包含的包：

<?xml version="1.0" encoding="UTF-8"?>
<site>
   <bundle id="org.apache.cxf.bundle" version="0.0.0">
      <category name="all"/>
   </bundle>
   <category-def name="all" label="Maven osgi-bundles"/>
</site>