如何在Gradle中检查文件的当前内容

Question

首先和formost ......我是Gradle的新手。话虽如此，我爱它。不幸的是，我遇到了麻烦。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，作为其过程的一部分，使用新的＆＃34;版本＆＃34;更新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。所有这些任务概述如下。问题是，尽管有getLatestVersion个正确的语句，mustRunAfter似乎被称为 first ，因为它始终读入＆＃34; PRE＆＃34; buildProject文件中列出的REVISION版本。如何在 getLatestVersion运行后确保buildProject读取文件 ？

以下是任务：

buildProject：

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

  commandLine command
}

deployToRemote

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}"
      }
    }
  }
}

getCurrentVersion

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

我的build.gradle文件最后有这个：

deployToRemote.mustRunAfter buildProject
getCurrentVersion.mustRunAfter buildProject

REVISION文件看起来像这样;

1196.dev10
919b642fd5ca5037a437dac28e2cfac0ea18ceed
dev

Answer 1

Gradle build three phases：初始化，配置和执行。

您遇到的问题是getCurrentVersion中的代码是在配置阶段执行的。在配置阶段，任务中的代码按其定义的顺序执行，并且不考虑依赖性。

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

如果执行gradle -q second，您将获得：

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
     }
  }
}