@Marvin In a

prefect.yaml

file, I would like to create a

dev

deployment that pulls my code from git in whatever branch was updated the latest. My initial thought was to do something like this:

pull:
  - prefect.deployments.steps.run_shell_script:
      id: get_latest_branch
      script: |
        bash -c '
          cd [MY REPO NAME HERE] && \
          git fetch --all && \
          LATEST_BRANCH=$(git for-each-ref --sort=-committerdate refs/remotes/origin/ --format="%(refname:short)" | grep -vE "^origin/(master|main)$" | head -n1 | sed "s#^origin/##") && \
          cd .. && \
          echo $LATEST_BRANCH
        '
  - prefect.deployments.steps.git_clone:
      repository: [LINK TO MY REPO]
      branch: "{{ get_latest_branch.stdout }}"

However, I've had different kinds of errors. How would you do this?

It seems there was an issue when trying to determine the latest version of Prefect and searching the documentations. However, I can guide you on setting up such a deployment in Prefect. Since you are dealing with errors related to fetching the latest branch and cloning it, I'll provide some tips to approach this: 1. Check Shell Script Execution: Ensure that the shell script you are running inside

prefect.deployments.steps.run_shell_script

executes correctly in your local shell environment. This will help identify syntax or logical errors in your script. 2. Pull and Clone Operations: - Run Shell Script: Ensure that the script has access to the necessary environment (e.g., Git configurations, authentication tokens if required). - Dynamic Value Passing: Make sure

get_latest_branch.stdout

is correctly referenced in the

git_clone

step. 3. Alternative Approach: If the

prefect.yaml

doesn't work as expected, consider using Python flow scripts for more control: - Use Python's subprocess to execute the shell script and capture the latest branch name. - Use Prefect tasks to clone the repository with the identified branch. Check out examples provided in Prefect documentation for deployment and shell script integration for more robust configurations. If you can provide additional error details, it would be helpful for further assistance. For checking specific configurations and compatibility with your Prefect version, please ensure you are referring to the correct Prefect documentation based on your installed version. Let me know if you try another approach or have specific error messages you need help with!

@Marvin Give me an example

prefect.yaml

file that would do this

Here is a conceptual example of how you might set up your

prefect.yaml

file to perform the task you described, assuming usage of Prefect 2.x:

yaml
deployments:
  - name: dev
    entrypoint: my_flow.py:flow_function  # Replace with your flow entrypoint.
    work_pool:
      name: my-work-pool
      work_queue_name: my-queue
    pull:
      - prefect.deployments.steps.run_shell_script:
          id: get_latest_branch
          script: |
            bash -c '
              git clone [LINK TO MY REPO] temp_repo && \
              cd temp_repo && \
              git fetch --all && \
              LATEST_BRANCH=$(git for-each-ref --sort=-committerdate refs/remotes/origin/ --format="%(refname:short)" | grep -vE "^origin/(master|main)$" | head -n1 | sed "s#^origin/##") && \
              echo $LATEST_BRANCH
            '
      - prefect.deployments.steps.run_shell_script:
          id: clone_latest_branch
          script: |
            bash -c '
              git clone -b $(cat temp_repo/LATEST_BRANCH) [LINK TO MY REPO] my_repo && \
              rm -rf temp_repo
            '

### Key Elements: 1. run_shell_script Step: This runs a bash command to clone the repository and determine the latest non-main/master branch. It first clones to a temporary directory, fetches all branches, determines the latest branch, and stores it. 2. clone_latest_branch Step: This clones the determined branch from your repository. 3. Adjust Paths and Links: Make sure to replace

[LINK TO MY REPO]

with your actual repository link and configure your flow entry point in

entrypoint

. This example assumes that you're using shell scripts to handle the process directly and adjust as needed per your specific environment and Prefect configuration. For further customization and checking git integration details, consider Prefect documentation on shell script integration and deployment steps. If you're using Prefect 3.x, the setup might vary, ensure you are referencing the correct documentation. Let me know if you need any more help!

@Tomás Rossetti - fyi, these steps like

prefect.deployments.steps.run_shell_script

are just fully qualified python function names which means, that if you don't want to write a bunch of bash to do file operations and stuff, you can write

your_module.steps.get_latest_branch

and then provide inputs like any other step for example: custom step definition and usage