gradle-73

tasks.register('generateTarManifest') {
    def manifestFile = layout.buildDirectory.file("tmp/tar-manifest/MANIFEST.MF")
    outputs.file(manifestFile)

    doLast {
        File file = manifestFile.get().asFile
        file.parentFile.mkdirs()

        Manifest manifest = new Manifest()
        def attributes = manifest.mainAttributes
        attributes.putValue("Manifest-Version", "1.0")
        attributes.putValue("Built-By", System.getProperty('user.name'))
        attributes.putValue("Implementation-Version", project.version.toString())
        attributes.putValue("Build-Date", new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ").format(new Date()))
        attributes.putValue("Build-Jdk", "${System.getProperty('java.version')} (${System.getProperty('java.vendor')})")
        attributes.putValue("Build-OS", "${System.getProperty('os.name')} ${System.getProperty('os.arch')}")

        file.withOutputStream { os ->
            manifest.write(os)
        }
    }
}