fix: handle FunctionNotFound for ECR-based image functions in sam sync#8603
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fix: handle FunctionNotFound for ECR-based image functions in sam sync#8603
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Fixes #8381 When sam sync --watch encounters an image function with an ECR URI but no DockerContext metadata, SamFunctionProvider skips it (since it can't be built locally). However, CodeTriggerFactory still tries to create a trigger for it, causing LambdaImageCodeTrigger to raise FunctionNotFound. This change catches FunctionNotFound alongside ResourceNotFound in _add_code_triggers(), allowing sam sync to gracefully skip these functions with a warning instead of crashing.
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reedham-aws
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Feb 3, 2026
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Issue
Fixes #8381
Description
sam sync --watchfails withFunctionNotFoundwhen a nested stack contains a Lambda function withPackageType: Imagethat uses an ECR URI forImageUriwithoutDockerContextmetadata.Root Cause
_add_code_triggers()iterates over all resource IDs from the templateLambdaImageCodeTrigger, which callsSamFunctionProvider.get()SamFunctionProvider._extract_functions()intentionally skips image functions with ECR URIs but noDockerContextmetadata (since they can't be built locally)SamFunctionProvider.get()to returnNone, raisingFunctionNotFoundSolution
Catch
FunctionNotFoundalongsideResourceNotFoundin_add_code_triggers(), allowingsam syncto gracefully skip these functions with a warning instead of crashing. This is consistent with how S3-based functions are already handled.Changes
samcli/lib/sync/watch_manager.py: AddedFunctionNotFoundto exception handlingtests/unit/lib/sync/test_watch_manager.py: Added test forFunctionNotFoundhandlingTesting
test_add_code_triggers_function_not_found