如何手动调用Gradle的存储库搜索？

Question

作为构建发布版本的前提条件，比如acme-widgets-1.0，我想搜索已配置的存储库(或特定存储库)以确保acme-widgets-1.0.jar尚未发布。我怎样才能用Gradle做到这一点？或者，有没有办法为特定版本配置not-exists依赖项？

group = 'com.acme'
version = '1.0'

repositories {
    jcenter()
}

if (gradle.startParameter.taskNames.contains("release")) {
    def taskNames = gradle.startParameter.taskNames
    taskNames.add(0, "checkReleaseDoesntExist")
    gradle.startParameter.taskNames = taskNames
}

task checkReleaseDoesntExist() {
}

task release() {
    println "Building release"
}

checkReleaseDoesntExist.doLast {
    println "Checking repositories to make sure release hasn't already been built"
    // TODO What do I do here?
}

Answer 1

您可以声明一个配置，其中只包含您试图查看其是否已经发布的工件。在解析此配置时，您将拥有一个空文件集或空文件集。

所以大概是这样的：

configurations {
    checkRelease { transitive = false }
}
dependency {
    checkRelease "$group:$name:$version"
}

task ('checkReleaseDoesntExist') {
    doLast {
        println "Checking repositories to make sure release hasn't already been built"
        try {
            if (!configurations.checkRelease.files.isEmpty()) {
                // already exists
            }
        }
        catch (ResolveException e) {
            // doesn't exist
        }
}