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?

shagupta-aws · 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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