如何在 Gradle 中检查文件的当前内容

Question

首先...我是 Gradle 新手。话虽如此，我喜欢它。不幸的是，我遇到了障碍。我有一系列任务是部署过程的一部分。一个 (buildProject) 调用一个 shell 脚本，作为其进程的一部分，它会使用新的“版本”更新一个 REVISION 文件。之后调用deployToRemote 任务将最新版本部署到服务器。它调用getCurrentVersion 从REVISION 文件中读取最新版本。下面概述了所有这些任务。问题是getLatestVersion 似乎被称为first，尽管有正确的mustRunAfter 语句，因为它总是在REVISION 文件中列出的“PRE”buildProject 版本中读取。我如何确保getLatestVersion 在 buildProject 运行后读取文件？

以下是任务：

构建项目：

task buildProject(type:Exec) {
  def command = ['./make-release', '-f']
  if (deployEnvironment != 'stage') {
    command = ['./make-release', "-e ${deployEnvironment}"]
  }

  commandLine command
}

部署到远程

task deployToRemote(dependsOn: 'getCurrentVersion') {
  doLast {
    def version = tasks.getCurrentVersion.hash()
    println "Using version ${version}"
    println "Using user ${webhostUser}"
    println "Using host ${webhostUrl}"
    ssh.run {
      session(remotes.webhost) {
        put from: "dist/project-${version}.tar.gz", into: '/srv/staging/'
        execute "cd /srv/staging; ./manual_install.sh ${version}"
      }
    }
  }
}

获取当前版本

task getCurrentVersion {
  def line
  new File("REVISION").withReader { line = it.readLine() }
  ext.hash = {
    line
  }
}

我的build.gradle 文件末尾有这个：

deployToRemote.mustRunAfter buildProject
getCurrentVersion.mustRunAfter buildProject

REVISION 文件如下所示；

1196.dev10
919b642fd5ca5037a437dac28e2cfac0ea18ceed
dev

Answer 1

Gradle build 有three phases：初始化、配置和执行。

您面临的问题是getCurrentVersion 中的代码是在配置阶段执行的。在配置阶段，任务中的代码按照定义的顺序执行，不考虑依赖关系。

考虑这个例子：

task second(dependsOn: 'first') {
    println 'second: this is executed during the configuration phase.'
    doLast {
      println 'second: This is executed during the execution phase.'
    }
}

task first {
    println 'first: this is executed during the configuration phase.'
    doLast {
      println 'first: This is executed during the execution phase.'
    }
}

second.mustRunAfter first

如果你执行gradle -q second，你会得到：

second: this is executed during the configuration phase.
first: this is executed during the configuration phase.
first: This is executed during the execution phase.
second: This is executed during the execution phase.

要修复您的脚本，您需要将代码放入doLast，如下所示：

task getCurrentVersion {
  doLast {
     def line
     new File("REVISION").withReader { line = it.readLine() }
     ext.hash = {
       line
     }
  }
}