当我们通过“系统管理—插件管理”安装*.hpi的插件，安装完成后在$jenkins_home/plugins目录下查看发现后缀是.jpi。在插件安装过程中发生了什么呢？
/jenkins/core/src/main/java/hudson/PluginManager.java
protected void copyBundledPlugin(URL src, String fileName) throws IOException {
LOGGER.log(FINE, "Copying {0}", src);
fileName = fileName.replace(".hpi",".jpi"); // normalize fileNames to have the correct suffix
String legacyName = fileName.replace(".jpi",".hpi");
long lastModified = getModificationDate(src);
File file = new File(rootDir, fileName);
https://github.com/jenkinsci/jenkins
https://javadoc.jenkins.io/hudson/PluginManager.html
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