gradle - download and unzip file from url

Question

What would be the proper gradle way of downloading and unzipping the file from url (http)?

If possible, I'd like to prevent re-downloading each time I run the task (in ant.get can be achieved by skipexisting: 'true').

My current solution would be:

task foo {
  ant.get(src: 'http://.../file.zip', dest: 'somedir', skipexisting: 'true')
  ant.unzip(src: 'somedir' + '/file.zip', dest: 'unpackdir')
}

still, I'd expect ant-free solution. Any chance to achieve that?

Answer 1

@CMPS:

So lets say you want to download this zip file as a dependency:

https://github.com/jmeter-gradle-plugin/jmeter-gradle-plugin/archive/1.0.3.zip

You define your ivy repo as:

repositories {
    ivy {
        url 'https://github.com/'
        layout 'pattern', {
            artifact '/[organisation]/[module]/archive/[revision].[ext]'
        }
    }
}

and then use it as:

dependencies {
    compile 'jmeter-gradle-plugin:jmeter-gradle-plugin:1.0.3@zip'
    //This maps to the pattern: [organisation]:[module]:[revision]:[classifier]@[ext]         
}

Borrowing @Matthias' unzip task, except picking up the zip from gradle cache:

task unzip(type: Copy) {

  def zipPath = project.configurations.compile.find {it.name.startsWith("jmeter") }
  println zipPath
  def zipFile = file(zipPath)
  def outputDir = file("${buildDir}/unpacked/dist")

  from zipTree(zipFile)
  into outputDir
}

Answer 2

There isn't currently a Gradle API for downloading from a URL. You can implement this using Ant, Groovy, or, if you do want to benefit from Gradle's dependency resolution/caching features, by pretending it's an Ivy repository with a custom artifact URL. The unzipping can be done in the usual Gradle way (copy method or Copy task).

Answer 3

Unzipping using the copy task works like this:

task unzip(type: Copy) {
  def zipFile = file('src/dists/dist.zip')
  def outputDir = file("${buildDir}/unpacked/dist")

  from zipTree(zipFile)
  into outputDir
}

http://mrhaki.blogspot.de/2012/06/gradle-goodness-unpacking-archive.html