[gradle-user] Tar Task Up-To-Date?

[Neil Chaudhuri]

I am generating a tar ball from a war file like so:

task buildTarball(type: Tar) {
  destinationDir file(outputDirName)
  compression Compression.GZIP
  includes ["${buildDir}/*.war"]
}

When I run this, I keep finding

:project:buildTarball UP-TO-DATE

There is no tar ball, so I don't know why this occurs. What are the criteria 
for determining whether a Tar task is up-to-date? Any insight into how I should 
rewrite my task is appreciated.

Thanks.