我正在使用maven-buildnumber-plugin版本1.0-beta-4。这在从Subversion检出的项目上可以正常工作，但在Jenkins中失败。

我认为这个问题是由于詹金斯以某种方式删除了.svn文件夹。

我认为错了。这是我得到的错误：

maven builder waiting
mavenExecutionResult exceptions not empty
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.codehaus.mojo:buildnumber-maven-plugin:1.0-beta-4:create (default) on project swift-core: Cannot get the revision information from the scm repository : 
Error!
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    at org.jvnet.hudson.maven3.launcher.Maven3Launcher.main(Maven3Launcher.java:79)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:329)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:239)
    at org.jvnet.hudson.maven3.agent.Maven3Main.launch(Maven3Main.java:146)
    at hudson.maven.Maven3Builder.call(Maven3Builder.java:124)
    at hudson.maven.Maven3Builder.call(Maven3Builder.java:71)
    at hudson.remoting.UserRequest.perform(UserRequest.java:114)
    at hudson.remoting.UserRequest.perform(UserRequest.java:48)
    at hudson.remoting.Request$2.run(Request.java:270)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)
Caused by: org.apache.maven.plugin.MojoExecutionException: Cannot get the revision information from the scm repository : 
Error!
    at org.codehaus.mojo.build.CreateMojo.getRevision(CreateMojo.java:673)
    at org.codehaus.mojo.build.CreateMojo.execute(CreateMojo.java:431)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    ... 27 more
Caused by: org.apache.maven.scm.ScmException: Error!
    at org.codehaus.mojo.build.CreateMojo.checkResult(CreateMojo.java:753)
    at org.codehaus.mojo.build.CreateMojo.getRevision(CreateMojo.java:648)
    ... 30 more

我忽略了这一点：

Provider message:
The svn command failed.
Command output:
/bin/sh: svn: command not found

mojoFailed org.codehaus.mojo:buildnumber-maven-plugin:1.0-beta-4(default)

svn机器上没有安装任何客户端，这才是真正的麻烦根源。