如何觸發Maven SCM插件根據現有目錄自動切換目標？ (How to trigger Maven SCM plugin to automatically switch goals based on existing directory?)

問題描述

如何觸發Maven SCM插件根據現有目錄自動切換目標？ (How to trigger Maven SCM plugin to automatically switch goals based on existing directory?)

我是 Maven 新手，遇到一個問題，我試圖根據源是否已經是自動將 SCM 插件目標從 checkout 更改為 update簽出。

誰能給我看一個代碼示例來讓它工作？這是插件配置：

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven‑scm‑plugin</artifactId>
    <version>1.9.4</version>
        <executions>
            <execution>
                <phase>generate‑sources</phase>
                <goals>
                    <goal>checkout</goal>
                </goals>
                <configuration>
                    <connectionType>developerConnection</connectionType>
                    <scmVersion>master</scmVersion>
                    <scmVersionType>branch</scmVersionType>
                    <checkoutDirectory>${project.basedir}/src</checkoutDirectory>
                    <workingDirectory>${project.basedir}/src</workingDirectory>
                </configuration>
            </execution>
        </executions>
</plugin>

參考解法

方法 1:

change goal:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven‑scm‑plugin</artifactId>
    <version>1.9.4</version>
        <executions>
            <execution>
                <phase>generate‑sources</phase>
                <goals>
                    <goal>update</goal>
                </goals>
                <configuration>
                    <connectionType>developerConnection</connectionType>
                    <scmVersion>master</scmVersion>
                    <scmVersionType>branch</scmVersionType>
                    <checkoutDirectory>${project.basedir}/src</checkoutDirectory>
                    <workingDirectory>${project.basedir}/src</workingDirectory>
                </configuration>
            </execution>
        </executions>
</plugin>

Reference
https://maven.apache.org/scm/maven‑scm‑plugin/
https://maven.apache.org/scm/maven‑scm‑plugin/update‑mojo.html

方法 2:

To change the goal of the SCM plugin was inspired by Đỗ Như Vý (above).

Approach was to

1. Place the goal in a property called scm.goal set to a default value ie update.
2. Use a profile (bootstrap) to change the scm.goal property value from 'update' to 'checkout'.
3. Activate the bootstrap profile based on missing .gitignore file.
4. Place the property scm.goal in the SCM plugin goal element.

Code:

    <properties>
        <scm.dest.path>${project.basedir}/src</scm.dest.path>
        <scm.goal>update</scm.goal>
    </properties>

    <profiles>
        <profile> 
            <id>bootstrap</id> 
            <activation> 
                <file>
                  <missing>./src/.gitignore</missing>
                </file>
             </activation> 
            <properties>
                <scm.goal>checkout</scm.goal>
            </properties>
        </profile>
    </profiles>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven‑scm‑plugin</artifactId>
                <version>1.9.4</version>
                <executions>
                    <execution>
                        <phase>generate‑sources</phase>
                        <goals>
                            <goal>${scm.goal}</goal>
                        </goals>
                        <configuration>
                            <connectionType>developerConnection</connectionType>
                            <scmVersion>master</scmVersion>
                            <scmVersionType>branch</scmVersionType>
                            <checkoutDirectory>${scm.dest.path}</checkoutDirectory>
                            <workingDirectory>${scm.dest.path}</workingDirectory>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
...

(by garyM、James Graham、garyM)

參考文件

1. How to trigger Maven SCM plugin to automatically switch goals based on existing directory? (CC BY‑SA 2.5/3.0/4.0)