Hi, We want to run a R script with in a

bash_command_solid

inside a

composite_solid

- and need to set a dependency between the output of a

solid

and the

bash_command_solid

. The pseudo code is as follows:

@composite_solid()
def func(): 
  path_to_file = save_file_solid()
  res = bash_command_solid(f"Rscript run_process.R {path_to_file}")
  return res

The error we receive is as follows:

dagster.core.definitions.events.Failure: Bash command execution failed with output: /tmp/tmpxxxxx line 1: syntax error near unexpected token `newline'\n/tmp/tmpxxxxx: `Rscirpt run_process.R <dagster.core.definitions.composition.InvokedSolidOutputHandle object at 0x7f....>'\n", "label": "intentional-failure", "metadata_entries":[]}

From what we understand the

composite_solid

is running within a pipeline and generating a temp path string output from the solid (without running the solid itself). Running the bash command in a terminal runs flawless. In other

composite_solid

s we are able to create dependencies so I'm guessing that it is related to

bash_command_solid

. What would be the correct approach for such task?

Hey sephi. The body of the @composite_solid function is run during pipeline construction time, not at runtime. So the “path_to_file” variable is not a the actual, path, but an object that represents the path. (It’s an instance of InvokedSolidOutputHandle, which explains the error string).