Component with bash script and python code - how to package/deploy

Question

I have created an AWS Greengrass component that consists of:  
 - A python program  
 - A bash script, called as a subprocess from within that Python program.   
  
I have it packaged/deployed as follows:  
 - .py file and .sh script zipped in my_archive.zip  
 - stored on S3:/path/to/my_archive.zip   
  
Snippet from recipe file is as follows:  
"Manifests": \[  
      {  
        "Platform": {  
          "os": "linux"  
        },  
        "Lifecycle": {  
          "Run": "python3 -u  {artifacts:decompressedPath}/my_archive/my_python_file.py "  
        },  
        "Artifacts": \[  
          {  
            "URI": "sS3:/path/to/my_archive.zip ",  
            "Unarchive": "ZIP",  
            "Permission": {  
              "Read": "ALL",  
              "Execute": "ALL"  
            }  
          }  
        ]  
      }  
    ]  
  
Within the code, the python file executes "subprocess.run" assuming that the script file is local:  
process = subprocess.Popen(\["./my_bash_script.sh",   
                "-i",  
                args])  
  
The logs report "file not found", and when I run "ls -ltrh" with the subprocess call within the component to debug, it reports 0 files.   
  
My question is -   
1. How do I get the deployed .sh filepath, relative to the python script, to be able to call it with the "subprocess" call?

Answer

Hi GreengrassUser,  
  
Thanks for using Greengrass V2. You cannot find the file from the `artifacts:decompressedPath` from the component process because when the lifecycle command runs its working directory will be set to the component's work path, i.e. /work/, as described in the documentation here https://docs.aws.amazon.com/greengrass/v2/developerguide/component-recipe-reference.html and you can verify $PWD from your component process. So you can access the file from the `artifacts:decompressedPath` by passing the path either as an environment variable or as an argument to your python script run lifecycle command as {artifacts:decompressedPath}/my_archive/my_bash_script.sh i.e. same as you run the python script.  
  
Thanks,  
Shagupta

Component with bash script and python code - how to package/deploy

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