How to install custom packages in Greengrass v2 lambda function

Question

Hey there 👋,

I'm trying to put a simple .txt file from my lambda function to a s3 bucket. My GG core device is installed in a Raspberry Pi 4 64bit arm.

However, I'm facing some library issues while doing so. Below you can see the problem.

`2023-10-01T05:15:11.388Z [INFO] (Copier) signal_processing_lambda: Startup script exited. {exitCode=0, serviceInstance=1, serviceName=signal_processing_lambda, currentState=STARTING}
2023-10-01T05:15:11.685Z [INFO] (pool-2-thread-86) signal_processing_lambda: lambda_runtime.py:402,Status thread started. {serviceInstance=1, serviceName=signal_processing_lambda, currentState=RUNNING}
2023-10-01T05:15:11.695Z [ERROR] (pool-2-thread-84) signal_processing_lambda: FATAL: lambda_runtime.py:146,Failed to import handler function "lambda_function.lambda_handler" due to exception: No module named 'boto3'. {serviceInstance=1, serviceName=signal_processing_lambda, currentState=RUNNING}
2023-10-01T05:15:11.698Z [ERROR] (pool-2-thread-84) signal_processing_lambda: FATAL: lambda_runtime.py:426,Failed to initialize Lambda runtime due to exception: No module named 'boto3'. {serviceInstance=1, serviceName=signal_processing_lambda, currentState=RUNNING}
2023-10-01T05:15:17.202Z [INFO] (pool-2-thread-82) signal_processing_lambda: shell-runner-start. {scriptName=services.signal_processing_lambda.lifecycle.shutdown.script, serviceInstance=1, serviceName=signal_processing_lambda, currentState=STOPPING, command=["/greengrass/v2/packages/artifacts/aws.greengrass.LambdaLauncher/2.0.11/lambda-..."]}`

It seems that I have to install the boto3 library for doing so.

**Therefore, my question is:** How can I install custom packages in the lambda function running in the core device?

This is my lambda component configuration

```
{
    "lambdaArn": "arn:aws:lambda:eu-central-1:109139691401:function:lambda_greengrass:${lambda_function_version}",
    "componentName": "signal_processing_lambda",
    "componentVersion": "${lambda_component_version}",
    "componentLambdaParameters": {
        "eventSources": [
            {
                "topic": "thesis/v1/greengrass/lambda/exp1",
                "type": "IOT_CORE"
            }
        ],
        "maxQueueSize": 1000,
        "maxInstancesCount": 100,
        "maxIdleTimeInSeconds": 60,
        "timeoutInSeconds": 3,
        "statusTimeoutInSeconds": 60,
        "pinned": false,
        "inputPayloadEncodingType": "json",
        "linuxProcessParams": {
            "isolationMode": "NoContainer",
            "containerParams": {
                "memorySizeInKB": 16384,
                "mountROSysfs": false,
                "volumes": [],
                "devices": []
            }
        }
    }
}
```

Answer

I just figured it out. For this I had to use two components, one for the dependencies and another one for the lambda function.

This is the component for the dependency of the function

```
{
    "RecipeFormatVersion": "2020-01-25",
    "ComponentName": "lambda_function_depedencies",
    "ComponentDescription": "Install Dependecies for Lambda Function",
    "ComponentPublisher": "Ed",
    "ComponentVersion": "1.0.0",
    "Manifests": [
        {
            "Lifecycle": {
                "install": "python3 -m pip install --user boto3"
            }
        }
    ]
}
```

This is the updated version of the lambda component

```
{
    "lambdaArn": "arn:aws:lambda:eu-central-1:109139691401:function:lambda_greengrass:${lambda_function_version}",
    "componentName": "signal_processing_lambda",
    "componentVersion": "${lambda_component_version}",
    "componentDependencies": {
        "lambda_function_depedencies": {
            "versionRequirement": "1.0.0",
            "dependencyType": "HARD"
        }
    },
    "componentLambdaParameters": {
        "eventSources": [
            {
                "topic": "thesis/v1/greengrass/lambda/exp1",
                "type": "IOT_CORE"
            }
        ],
        "maxQueueSize": 1000,
        "maxInstancesCount": 100,
        "maxIdleTimeInSeconds": 60,
        "timeoutInSeconds": 3,
        "statusTimeoutInSeconds": 60,
        "pinned": false,
        "inputPayloadEncodingType": "json",
        "linuxProcessParams": {
            "isolationMode": "NoContainer",
            "containerParams": {
                "memorySizeInKB": 16384,
                "mountROSysfs": false,
                "volumes": [],
                "devices": []
            }
        }
    }
}
```

How to install custom packages in Greengrass v2 lambda function

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