su: ignoring --preserve-environment, it's mutually exclusive with --login

checkpoint: Part of the Reproducible R Toolkit from Microsoft
https://mran.microsoft.com/documents/rro/reproducibility/
Warning in ..stacktraceon..({ :
  Packges list or library path is not set, this could take a while
Error in checkpoint(snapshotDate = opt$date, checkpointLocation = opt$pathBase,  : 
  argument "snapshot_date" is missing, with no default
Calls: runApp ... ..stacktraceon.. -> checkpoint -> checkpoint_dir -> file.path
Execution halted