@Marvin is it possible to run a script before the main function executes in a deployment?

It appears that the Prefect documentation doesn't specifically address running a script before the main function of a deployment. However, deployments in Prefect are metadata that can include various settings and triggers. You might want to consider setting up a custom pre-run trigger in Prefect Cloud for Cloud-only deployments, or implement the script logic within your flow as a separate task that is ensured to run before your main task. For further details on deployments and how to manage them, you can review the Prefect documentation on deployments here, and additional information on work pools which includes some deployment examples here. Additionally, depending on your use case, you may want to look into implementing setup tasks within your flow that run prior to your main function. Keep in mind that Prefect's flow programming model should allow you to structure your tasks' dependencies to ensure a certain order of execution.

yes!

It seems the link provided does not include an example for a

pull

step with

run_shell_script

. However, I can craft a hypothetical example for you. In Prefect 2.x, you would create a

pull

block to specify a script you want to run. Here's an example of how you might structure a flow to include a

run_shell_script

step:

python
from prefect import flow, task
from prefect.shell import run_shell_command
from prefect.deployments import DeploymentSpec
from prefect.flow_runners import SubprocessFlowRunner

@task
def run_shell_script():
    return run_shell_command.run("path/to/your/script.sh")

@flow
def my_flow():
    shell_script_result = run_shell_script()
    # Further tasks that depend on the output of the shell script can go here.

if __name__ == "__main__":
    DeploymentSpec(
        flow=my_flow,
        name="Shell Script Pull Example",
        flow_runner=SubprocessFlowRunner(),
        tags=["example"]
    )

This example is illustrative; the actual API may differ slightly. It uses the

run_shell_command

from the Prefect tasks library to run a shell script as part of the

pull

step in a deployment. Make sure your path to the script is corrected and the script has the appropriate executable permissions. Please refer to the Prefect documentation for the most up-to-date information on creating flows and deployments.

🙄

thank you @Nate!