checkout.kt

fun main(args: Array<String>) {
    val tmpPath = File(System.getProperty("java.io.tmpdir")).toPath()
    val fileAttribute = PosixFilePermissions.asFileAttribute(PosixFilePermissions.fromString("rwxrwx---"))
    val tmpDir = Files.createTempDirectory(
            tmpPath,
            "hogehoge",
            fileAttribute
    ).toFile()
    val git = Git.
            init().
            setDirectory(tmpDir).
            call()

    git.remoteAdd().apply {
        setName("origin")
        setUri(URIish("https://github.com/kikuchy/line-sender.git"))
    }.call()
    git.fetch().apply {
        setTagOpt(TagOpt.FETCH_TAGS)
    }.call()
    git.checkout().setName(git.tagList().call()[0].objectId.name).call()
}