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我已经配置了一个 Maven 项目以使用以下方式签出一个项目：

<scm>
    <developerConnection>scm:git:git@git.github.com:example/myproject.git</developerConnection>
</scm>

使用： mvn scm:checkout

该项目检查良好。

我希望如果 scm:checkout 有效， scm:update 也应该有效。但事实并非如此。通过使用“-e”选项 (mvn -e scm:update) 运行以获取完整的堆栈跟踪，它将显示一些模糊的错误消息：

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-scm-plugin:1.8.1:update (default-cli) on project mysampleproject: Command failed.The git-log command failed. -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-scm-plugin:1.8.1:update (default-cli) on project mysampleproject: Command failed.The git-log command failed.
    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:320)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.MojoExecutionException: Command failed.The git-log command failed.
    at org.apache.maven.scm.plugin.AbstractScmMojo.checkResult(AbstractScmMojo.java:439)
    at org.apache.maven.scm.plugin.UpdateMojo.execute(UpdateMojo.java:93)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    ... 19 more
[ERROR] 
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

现在这个错误应该告诉我什么？这可能是 Maven-scm-Plugin 中的错误吗？因为“git-log”当然不存在，它的“git log”会给你 Git 日志历史。

此外，给定的帮助链接也无济于事（从我的角度来看）。

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