Help passing form.yml variable to script.sh.erb for Interactive Application

Get Help
1

Hello

We have an RStudio interactive app which has been working well. We are trying to add an enhancement so the user can select which version of R to load with RStudio. I added the following to form.yml:

  r_version:
    widget: "select"
    options:
      - ["default","default"]
      - ["4.2.0","4.2.0"]
      - ["4.1.3","4.1.3"]
      - ["4.1.2","4.1.2"]
      - ["4.1.1","4.1.1"]
      - ["4.1.0","4.1.0"]
      - ["4.0.5","4.0.5"]
      - ["4.0.4","4.0.4"]
      - ["4.0.3","4.0.3"]
      - ["4.0.2","4.0.2"]
      - ["4.0.0","4.0.0"]
      - ["3.6.3","3.6.3"]
      - ["3.6.0","3.6.0"]
      - ["3.5.3","3.5.3"]
      - ["3.5.0","3.5.0"]
      - ["3.3.0","3.3.0"]
      - ["3.2.0","3.2.0"]
      - ["3.1.0","3.1.0"]
      - ["3.0.0","3.0.0"]
      - ["2.15.0","2.15.0"]

and also added r_version to the form: section

form:
  - r_version
  - bc_queue
  - bc_num_hours
  - slurm_mem
  - slurm_cores
  - slurm_scratch

Now, I would like to use the value of r_version in script.sh.erb but I am struggling to understand how the variable scoping works with erb. I naively tried:

#!/usr/bin/env bash

r_version="<%= r_version %>"

if [[ ${r_version} == "default" ]]; then
    r_version=""
fi

module load CBI
module load r/"${r_version}"
module load rstudio-server-controller

# Start RSC launching the personal Rstudio Server instance
rsc start --port="${port:?}"

This results in:

Failed to stage the template with the following error:

undefined local variable or method `r_version' for #<BatchConnect::Session::TemplateBinding:0x00007f248535da80>

    The RStudio Server session data for this session can be accessed under the staged root directory.

Any help would be greatly appreciated.

-Harry

2

You need to use context.r_version.

1 Like
3

Works perfectly, thanks so much!

4

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.