We presently require the assembly:assembly goal. This has been deprecated for quite some time. We should support assembly:single but that doesn't work now with our current structure. Also, assembly plugin handles unpacking so we can use a more standard approach. Also the assembly build should occur as a normal part of the lifecycle. A user shouldn't have to execute that in addition to the normal build.RPM plugin doens't have the flexibility of the assembly plugin though so for now it will need to still use the generated-source trick.