Overriding RStudio's Startup Hook inside Rprofile

From the R and RStudio in a Secured Environment on CentOS 7 and Improving the secured computer-based testing environment for R on CentOS 7 using Rprofile and Renviron posts, there was a need to override commands that required internet access in an internetless environment. One huge part of the puzzle that wasn’t quite solved was the ability to disable the install.packages() command within RStudio. In particular, the outcome from running …