Lambda Function code to fetch from git

Question

I have created a codepipline using the following git link 
https://github.com/aws-samples/aws-serverless-samfarm/blob/master/pipeline/pipeline.yaml

The Pipeline has been created and I have connected the source to my Git repo(V2). I am using the following file as a SAM Input for lambda creation. How can I make the lambda function fetch the function code stored in a git folder in the same branch where I want to deploy the pipeline? Do I need to create a build spec file or something?

AWSTemplateFormatVersion: '2010-09-09'
Description: Lambda function and EventBridge rule for EC2 Instance State Change

Resources:
  LambdaFunction:
    Type: AWS::Lambda::Function
    Properties:
      FunctionName: xxxxx_xxxx
      Handler: main.lambda_handler
      Role: arn:aws:iam::xxxxx:role/xxxxxxxxxx
      Runtime: python3.8
      Timeout: 60

EventBridgeRule:
    Type: AWS::Events::Rule
    Properties:
      Name: sk-poc-usstg-ec2-state-change
      EventPattern:
        source:
          - aws.ec2
        detail-type:
          - EC2 Instance State-change Notification
        detail:
          state:
            - stopped
            - stopping
      Targets:
        - Arn: !GetAtt LambdaFunction.Arn
          Id: TargetLambda

Outputs:
  LambdaFunctionArn:
    Description: ARN of the Lambda function
    Value: !GetAtt LambdaFunction.Arn

EventBridgeRuleArn:
    Description: ARN of the Amazon EventBridge rule
    Value: !Ref EventBridgeRule  # Reference the EventBridge rule's ARN

Answer

Try the following in your buildspec:

1. cd into the top of your repo copy.
2. git fetch.
3. git checkout HEAD path/to/file.
4. Push code into your lambda.

Lambda Function code to fetch from git

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