sam local invoke supports detecting layers from SAR nested app's Outputs

[robk1234]

Describe your idea/feature/enhancement

sam local invoke doesn't load layers imported from a AWS::Serverless::Application.

I'm trying to follow this procedure:
https://awslabs.github.io/aws-lambda-powertools-python/latest/#lambda-layer

When I deploy to AWS, the Lambda layer gets created and the code completes.

When I run:

 r53-automation git:(master) ✗ sam local invoke --force-image-build --event events/find_zone.json ZoneFinderFunction
2021-05-11 14:16:03 Requesting to create CFN template arn:aws:serverlessrepo:eu-west-1:057560766410:applications/aws-lambda-powertools-python-layer/1.15.0 in serverless application repo...
2021-05-11 14:16:05 {'ResponseMetadata': {'RequestId': '9b3d41c6-2237-40b2-9687-59263a4b1632', 'HTTPStatusCode': 201, 'HTTPHeaders': {'date': 'Tue, 11 May 2021 18:16:04 GMT', 'content-type': 'application/json', 'content-length': '1682', 'connection': 'keep-alive', 'x-amzn-requestid': '9b3d41c6-2237-40b2-9687-59263a4b1632', 'x-amz-apigw-id': 'fLR7sF-NoAMF_Rw=', 'x-amzn-trace-id': 'Root=1-609ac9e4-6ffa4c5e3576ed933a10935f'}, 'RetryAttempts': 0}, 'ApplicationId': 'arn:aws:serverlessrepo:eu-west-1:057560766410:applications/aws-lambda-powertools-python-layer', 'CreationTime': '2021-05-11T18:16:04.942Z', 'ExpirationTime': '2021-05-12T00:16:04.942Z', 'SemanticVersion': '1.15.0', 'Status': 'PREPARING', 'TemplateId': '9fe5efce-82ac-4ee4-a52a-1dccffbe4c02', 'TemplateUrl': 'https://awsserverlessrepo-changesets-plntc6bfnfj.s3.amazonaws.com/777548758970/arn%3Aaws%3Aserverlessrepo%3Aeu-west-1%3A057560766410%3Aapplications-aws-lambda-powertools-python-layer-versions-1.15.0/e8b84b8c-af66-4290-92aa-96a5dfb645d5.yaml?X-Amz-Security-Token=IQoJb3JpZ2luX2VjECIaCXVzLWVhc3QtMSJGMEQCIGdOuHqn2s3K0aSJ79tXGoVa85aKPandmC97587S8HMAAiAO9QBzFBMtJcQP%2BQMSiemA7r%2B5%2FIFMlu%2BGJJYmu1RxfCrxAQiq%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F8BEAEaDDA2NjI0MjQ2ODY1NCIMPMcltDsAGH%2BviBq5KsUBma220INO4MQ2Ds9xiN1rkUuiQjbYjdi4DpNTaG%2B8l3iRausx%2FSS%2B5yF%2BTkmcdK0joO6OIhx8VzwmBhzU5yghwh5wIhzb3rzt46M%2B3xxm5fyGDiUQeh9LSrAZoYyNxryAiKvsu7vahHVeSMcwdyFrDX1AAmXWsX8JXRvxtrrNbFsJwDVC7W50ZQ4T%2F6bcueAg6QlJCdh%2Bl%2BYWnfawxjsTzC%2FUFA%2FexkrN8FhRvm0xEaQH%2FSYdw2N4eDGCtml7GxCZRUnJ8Vgw1fTqhAY64QES3vpkzr%2BfKsxhWZGCKFwO6TJWHnLl5UOaW%2BW%2FJDr3Jc9bLkHRbRvaXCP6FgzRV20Z31UmARfGpDjGSmP2tEM%2F9H9f34ePMccS4vkTiYRTuxty%2B7A7BuP6EZG4v1SZio9ILXo7aPOyGeMMGI%2FRXDPB6vuR3kKRrrzxGmrlCnJ4fSHAruMesw4s18bCloQs8XFaTKF1CDPJ%2FSPJ5poCuAAjeES4SHemn0xDvMVo4BPvONlaRUsFmU2lj5InxcW0B7qdsXg36no3ljgVVTRign6ioParWJGLycKSHQTIsMTiLUY%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20210511T181604Z&X-Amz-SignedHeaders=host&X-Amz-Expires=21600&X-Amz-Credential=ASIAQ63C33MXDMXGSCNP%2F20210511%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=9d388c64ce05af4995a152dc4e7d1b378145963f72ad2263db52749111fb76fa'}
2021-05-11 14:16:05 Requested to create CFN template arn:aws:serverlessrepo:eu-west-1:057560766410:applications/aws-lambda-powertools-python-layer/1.15.0 in serverless application repo.
2021-05-11 14:16:05 Requesting to create CFN template arn:aws:serverlessrepo:eu-west-1:057560766410:applications/aws-lambda-powertools-python-layer/1.15.0 in serverless application repo...
2021-05-11 14:16:06 {'ResponseMetadata': {'RequestId': 'caee4be3-8d60-40b0-8076-e91b383f1780', 'HTTPStatusCode': 201, 'HTTPHeaders': {'date': 'Tue, 11 May 2021 18:16:06 GMT', 'content-type': 'application/json', 'content-length': '1682', 'connection': 'keep-alive', 'x-amzn-requestid': 'caee4be3-8d60-40b0-8076-e91b383f1780', 'x-amz-apigw-id': 'fLR76HmbIAMFVkQ=', 'x-amzn-trace-id': 'Root=1-609ac9e5-382699872eb86b312d7be6e9'}, 'RetryAttempts': 0}, 'ApplicationId': 'arn:aws:serverlessrepo:eu-west-1:057560766410:applications/aws-lambda-powertools-python-layer', 'CreationTime': '2021-05-11T18:16:06.294Z', 'ExpirationTime': '2021-05-12T00:16:06.294Z', 'SemanticVersion': '1.15.0', 'Status': 'PREPARING', 'TemplateId': '6115398d-ed74-4861-b228-f342279894a9', 'TemplateUrl': 'https://awsserverlessrepo-changesets-plntc6bfnfj.s3.amazonaws.com/777548758970/arn%3Aaws%3Aserverlessrepo%3Aeu-west-1%3A057560766410%3Aapplications-aws-lambda-powertools-python-layer-versions-1.15.0/06711f5d-5102-4689-90c9-31db3a4e628e.yaml?X-Amz-Security-Token=IQoJb3JpZ2luX2VjECIaCXVzLWVhc3QtMSJGMEQCIGdOuHqn2s3K0aSJ79tXGoVa85aKPandmC97587S8HMAAiAO9QBzFBMtJcQP%2BQMSiemA7r%2B5%2FIFMlu%2BGJJYmu1RxfCrxAQiq%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F8BEAEaDDA2NjI0MjQ2ODY1NCIMPMcltDsAGH%2BviBq5KsUBma220INO4MQ2Ds9xiN1rkUuiQjbYjdi4DpNTaG%2B8l3iRausx%2FSS%2B5yF%2BTkmcdK0joO6OIhx8VzwmBhzU5yghwh5wIhzb3rzt46M%2B3xxm5fyGDiUQeh9LSrAZoYyNxryAiKvsu7vahHVeSMcwdyFrDX1AAmXWsX8JXRvxtrrNbFsJwDVC7W50ZQ4T%2F6bcueAg6QlJCdh%2Bl%2BYWnfawxjsTzC%2FUFA%2FexkrN8FhRvm0xEaQH%2FSYdw2N4eDGCtml7GxCZRUnJ8Vgw1fTqhAY64QES3vpkzr%2BfKsxhWZGCKFwO6TJWHnLl5UOaW%2BW%2FJDr3Jc9bLkHRbRvaXCP6FgzRV20Z31UmARfGpDjGSmP2tEM%2F9H9f34ePMccS4vkTiYRTuxty%2B7A7BuP6EZG4v1SZio9ILXo7aPOyGeMMGI%2FRXDPB6vuR3kKRrrzxGmrlCnJ4fSHAruMesw4s18bCloQs8XFaTKF1CDPJ%2FSPJ5poCuAAjeES4SHemn0xDvMVo4BPvONlaRUsFmU2lj5InxcW0B7qdsXg36no3ljgVVTRign6ioParWJGLycKSHQTIsMTiLUY%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20210511T181606Z&X-Amz-SignedHeaders=host&X-Amz-Expires=21600&X-Amz-Credential=ASIAQ63C33MXDMXGSCNP%2F20210511%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=ffcba9ee3e2bfc70020de53c1b3764b0aff1a2ef8ea8e281bc9a50be6b9a01a4'}
2021-05-11 14:16:06 Requested to create CFN template arn:aws:serverlessrepo:eu-west-1:057560766410:applications/aws-lambda-powertools-python-layer/1.15.0 in serverless application repo.
2021-05-11 14:16:06 Requesting to create CFN template arn:aws:serverlessrepo:eu-west-1:057560766410:applications/aws-lambda-powertools-python-layer/1.15.0 in serverless application repo...
2021-05-11 14:16:07 {'ResponseMetadata': {'RequestId': '18418eee-20c2-48c7-8abd-51f4903c4a95', 'HTTPStatusCode': 201, 'HTTPHeaders': {'date': 'Tue, 11 May 2021 18:16:07 GMT', 'content-type': 'application/json', 'content-length': '1682', 'connection': 'keep-alive', 'x-amzn-requestid': '18418eee-20c2-48c7-8abd-51f4903c4a95', 'x-amz-apigw-id': 'fLR8HGd0oAMFYlg=', 'x-amzn-trace-id': 'Root=1-609ac9e7-6bc45bc81a616ac0030682a8'}, 'RetryAttempts': 0}, 'ApplicationId': 'arn:aws:serverlessrepo:eu-west-1:057560766410:applications/aws-lambda-powertools-python-layer', 'CreationTime': '2021-05-11T18:16:07.558Z', 'ExpirationTime': '2021-05-12T00:16:07.558Z', 'SemanticVersion': '1.15.0', 'Status': 'PREPARING', 'TemplateId': 'b668cba3-817e-47b9-a83b-f97aa3a4232e', 'TemplateUrl': 'https://awsserverlessrepo-changesets-plntc6bfnfj.s3.amazonaws.com/777548758970/arn%3Aaws%3Aserverlessrepo%3Aeu-west-1%3A057560766410%3Aapplications-aws-lambda-powertools-python-layer-versions-1.15.0/1106d9b0-38b4-433d-8db6-648c26d935cb.yaml?X-Amz-Security-Token=IQoJb3JpZ2luX2VjECIaCXVzLWVhc3QtMSJGMEQCIGdOuHqn2s3K0aSJ79tXGoVa85aKPandmC97587S8HMAAiAO9QBzFBMtJcQP%2BQMSiemA7r%2B5%2FIFMlu%2BGJJYmu1RxfCrxAQiq%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F8BEAEaDDA2NjI0MjQ2ODY1NCIMPMcltDsAGH%2BviBq5KsUBma220INO4MQ2Ds9xiN1rkUuiQjbYjdi4DpNTaG%2B8l3iRausx%2FSS%2B5yF%2BTkmcdK0joO6OIhx8VzwmBhzU5yghwh5wIhzb3rzt46M%2B3xxm5fyGDiUQeh9LSrAZoYyNxryAiKvsu7vahHVeSMcwdyFrDX1AAmXWsX8JXRvxtrrNbFsJwDVC7W50ZQ4T%2F6bcueAg6QlJCdh%2Bl%2BYWnfawxjsTzC%2FUFA%2FexkrN8FhRvm0xEaQH%2FSYdw2N4eDGCtml7GxCZRUnJ8Vgw1fTqhAY64QES3vpkzr%2BfKsxhWZGCKFwO6TJWHnLl5UOaW%2BW%2FJDr3Jc9bLkHRbRvaXCP6FgzRV20Z31UmARfGpDjGSmP2tEM%2F9H9f34ePMccS4vkTiYRTuxty%2B7A7BuP6EZG4v1SZio9ILXo7aPOyGeMMGI%2FRXDPB6vuR3kKRrrzxGmrlCnJ4fSHAruMesw4s18bCloQs8XFaTKF1CDPJ%2FSPJ5poCuAAjeES4SHemn0xDvMVo4BPvONlaRUsFmU2lj5InxcW0B7qdsXg36no3ljgVVTRign6ioParWJGLycKSHQTIsMTiLUY%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20210511T181607Z&X-Amz-SignedHeaders=host&X-Amz-Expires=21600&X-Amz-Credential=ASIAQ63C33MXDMXGSCNP%2F20210511%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=1f2f66a871c49fa23dbbd53e320b85ff2297c14bb51bbeff0859bd7d1f601b78'}
2021-05-11 14:16:07 Requested to create CFN template arn:aws:serverlessrepo:eu-west-1:057560766410:applications/aws-lambda-powertools-python-layer/1.15.0 in serverless application repo.
Invoking app.lambda_handler (python3.8)
Building image............
Skip pulling image and use local one: amazon/aws-sam-cli-emulation-image-python3.8:rapid-1.23.0.

Mounting /Users/rklages/interesting/dns/r53-automation/.aws-sam/build/ZoneFinderFunction as /var/task:ro,delegated inside runtime container
START RequestId: 1e546c65-a2d0-436f-b3b1-52fed649c5a2 Version: $LATEST
Traceback (most recent call last): Unable to import module 'app': No module named 'aws_lambda_powertools'
END RequestId: 1e546c65-a2d0-436f-b3b1-52fed649c5a2
REPORT RequestId: 1e546c65-a2d0-436f-b3b1-52fed649c5a2	Init Duration: 0.24 ms	Duration: 2126.17 ms	Billed Duration: 2200 ms	Memory Size: 128 MB	Max Memory Used: 128 MB	
{"errorMessage": "Unable to import module 'app': No module named 'aws_lambda_powertools'", "errorType": "Runtime.ImportModuleError", "stackTrace": []}%          

I get an import error. There are no layer definitions in .aws-sam/build.toml

r53-automation git:(master) ✗ cat .aws-sam/build.toml 
# This file is auto generated by SAM CLI build command

[function_build_definitions]
[function_build_definitions.42418459-82cf-4b90-a827-08dd69e2a4fa]
codeuri = "/Users/rklages/interesting/dns/r53-automation/functions/zone_finder"
runtime = "python3.8"
source_md5 = ""
packagetype = "Zip"
functions = ["ZoneFinderFunction"]

[function_build_definitions.e97041b9-a457-4e60-818e-403c1ec215a2]
codeuri = "/Users/rklages/interesting/dns/r53-automation/functions/backup_record"
runtime = "python3.8"
source_md5 = ""
packagetype = "Zip"
functions = ["RecordBackupFunction"]

[layer_build_definitions]

➜  r53-automation git:(master) ✗ sam --version
SAM CLI, version 1.23.0

Proposal

Add details of how to add this to the product.

Things to consider:

1. Will this require any updates to the SAM Spec

Additional Details

[ssenchenko]

Thanks for the feature request! We have a roadmap here, but we also try to take in popular feature requests based on 👍🏽 from the community. We will be adding this to our intake for prioritization.