[FEA] Offline Usage Support

[TheRainstorm]

The server is in an offline environment, and rapids-cmake always tries to download files from the network. Is there a way to support offline usage of rapids-cmake? Is it sufficient to just download the rapids-cmake repository and then set CMAKE_MODULE_PATH to use it normally?

[vyasr]

Sorry for the slow response here. @robertmaynard is best positioned to answer the current state of things here. The last time that we looked into this, the steps required were documented in rapidsai/cudf#9757 (a library that uses rapids-cmake). Essentially what it boils down to is that you need to download both rapids-cmake itself and any other dependency that would be downloaded by CPM as part of the CMake configure process.