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SDF supports execution of arbitrary scripts which can be executed via the sdf exec command. In this way, you may string multiple commmands together, sequentially. scripts is a reserved name keyword in the config yml block. Each property in scripts will be an independently executable command. To execute any script run: sdf exec [SCRIPT_NAME] Keep in mind:
  • If a subcommand exits with an error code, SDF will propagate that error code, and exit with that same error code
  • SDF pipes both stdout and stderr from subcommands
  • Scripts are run via the sh shell. Color coding will not be preserved.

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Getting Started

To configure a custom script, add a scripts element to the config block. Each element in the properties array will become a separately executable command. 
---
config:
  name: scripts
  description: My custom scripts
  properties:
    my_script: "echo 'hello world'"
    other_script: "echo $USER"
    macro_script: "echo {{env_var('PWD')}}" # needs preprocessor: jinja
You are now able to execute these scripts as:
  • sdf exec my_script
  • sdf exec other_script
  • sdf exec macro_script

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Reserved Script Keywords: Pre-Compile, Pre-Run, Post-Compile & Post-Run

In addition to generic scripts, SDF has 4 reserved keywords which will execute scripts natively as part of sdf compile and sdf run commands.
  • pre-compile -> When executing sdf compile or sdf check or sdf report, the script in pre-compile is executed first
  • post-compile -> When executing sdf compile or sdf check or sdf report, the script in post-compile is executed after compile has successfully finished
  • pre-run -> When executing sdf run or sdf test or sdf stats, the script in pre-run is executed first
  • post-run -> When executing sdf run or sdf test or sdf stats, the script in post-run is executed after run has successfully finished

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Example

The configuration below utilizes all 4 keywords. Let’s add it to the default workspace from sdf new 
---
config:
  name: scripts
  description: Below are the 4 reserved keywords for scripts
  properties:
    pre-compile: >
      echo "RUNNING PRE-COMPILE"
    post-compile: >
      echo "RUNNING POST-COMPILE"
    pre-run: >
      echo "RUNNING PRE-RUN"
    post-run: >
      echo "RUNNING POST-RUN"
When executing sdf compile, we now run the pre-compile script first, and then post-compile resulting in the below output. 
> sdf compile
  Working set 1 model file, 1 .sdf file
         Info Executing pre-hook
  RUNNING PRE-COMPILE
    Compiling cfg.pub.main (./models/main.sql)
         Info Executing post-hook
  RUNNING POST-COMPILE
     Finished 1 model [1 succeeded] in 0.270 secs

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Use Cases

Scripts allow for organization specific workflows
  • Pre-hooks and Post-hooks -> Run custom logic before or after an SDF command
  • Metadata uploading -> Upload SDF’s information schema to a database for further processing.
  • Post processing -> Parse metadata for post-run statistics
  • Validate results -> Run python, js, shell, or any other process to validate that current changes fit with your current data infrastructure.

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User & Root User

Scripts inherit the user of the calling SDF process. As a result sudo sdf exec ... will run subcommands as sudo as well. See the below script to validate whether an SDF script is root. 
---
config:
  name: scripts
  properties:
    is_root: >
      if [ "$EUID" -ne 0 ]
        then echo "Not running as root"
      else 
        echo "Running as root"
      fi
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