Tidy up Linux container example [ci skip]

Author: HenrikBengtsson

R/batchtools_slurm.R

@@ -109,15 +109,25 @@ print.BatchtoolsSlurmFutureBackend <- function(x, ...) {
 #' info <- value(f)
 #' print(info)
 #'
-#' # As above, but run R within the Rocker 'r-base' Linux container.
+#' # As above, but run R within the Rocker 'r-base' Linux container;
+#' #
+#' #   mkdir -p ~/lxc
+#' #   apptainer build ~/lxc/rocker_r-base.sif docker://rocker/r-base
+#' #
 #' # It assumes that 'future.batchtools' has been installed in the
-#' # container already to the below 'R_LIBS_USER' library path.
+#' # container already with 'R_LIBS_USER' on host;
+#' #
+#' #   R_LIBS_USER="~/R/rocker-%p-library/%v" \
+#' #     apptainer exec ~/lxc/rocker_r-base.sif R --quiet
+#' #   > chooseCRANmirror(ind = 1)
+#' #   > install.packages("future.batchtools")
+#' #
 #' plan(future.batchtools::batchtools_slurm, resources = list(
 #'   time = "00:10:00", mem = "400M",
 #'   asis = c("--nodes=1", "--ntasks=4", "--partition=freecycle"),
 #'   modules = c("r", "jags"),
 #'   details = TRUE,
-#'   envs = c(R_LIBS_USER="~/R/rocker-%p-library/%v-CBI-gcc13"),
+#'   envs = c(R_LIBS_USER="~/R/rocker-%p-library/%v"),
 #'   rscript = c("apptainer", "exec", "~/lxc/rocker_r-base.sif", "Rscript")
 #' ))
 #'