AWS CodeBuild error: 'list' object has no attribute 'get'

[alakdam07]

I'm encountering an issue while deploying with AWS CodeBuild and AWS Deployment Framework (ADF). The deployment process fails with the following error message:

'list' object has no attribute 'get'

This is my directory tree:

my-repo/
├── buildspec.yml
├── deploy.sh
├── memeber_template.yml
├── nested_cloudtrail_filter_template.yml
├── nested_cloudtrail_permission_template.yml
├── sok_generate_targets.py
└── template.yml

This error occurs within the deploy.sh script, specifically in the line where I fetch the S3 bucket name using the AWS Systems Manager (SSM) get-parameters command.

Here's a simplified version of my deploy.sh script:

#!/bin/bash

echo "Determining regions to prepare"
app_regions=$(aws ssm get-parameters --names /deployment/$ADF_DEPLOYMENT_MAP_SOURCE/$ADF_PROJECT_NAME/regions --with-decryption --output=text --query='Parameters[0].Value')
regions=$(echo $app_regions | sed -e 's/\[\([^]]*\)\]/\1/g' | sed 's/,/ /g' | sed "s/'//g")

for region in $regions
do
    echo "Packaging templates for region $region"
    ssm_bucket_name="/cross_region/s3_regional_bucket/$region"
    bucket=$(aws ssm get-parameters --names $ssm_bucket_name --with-decryption --output=text --query='Parameters[0].Value')
    echo "Bucket: $bucket"

    # Upload nested templates to S3
    aws s3 cp nested_cloudtrail_filter_template.yml s3://$bucket/
    aws s3 cp nested_cloudtrail_permission_template.yml s3://$bucket/

    # Update CloudFormation template to use S3 URLs
    sed -i "s|nested_cloudtrail_filter_template.yml|https://$bucket.s3.amazonaws.com/nested_cloudtrail_filter_template.yml|g" template_$region.yml
    sed -i "s|nested_cloudtrail_permission_template.yml|https://$bucket.s3.amazonaws.com/nested_cloudtrail_permission_template.yml|g" template_$region.yml

    # Package main template
    aws cloudformation package --s3-bucket $bucket --output-template-file $CODEBUILD_SRC_DIR/template_$region.yml --region $region --template-file $CODEBUILD_SRC_DIR/template.yml
    echo "Packaging complete for region $region"
    echo "Template: $CODEBUILD_SRC_DIR/template_$region.yml"
done

And here's the error output I'm seeing in CodeBuild:

Packaging templates for region eu-north-1

Bucket: adf-global-base-deployment-pipelinebucket-wy5hi2yi7zog

... (output truncated for brevity)

Unable to upload artifact nested_cloudtrail_filter_template.yml referenced by TemplateURL parameter of nestedCloudTrailFilter resource.

'list' object has no attribute 'get'

Packaging complete for region eu-north-1

Template: /codebuild/output/src2263745840/src/template_eu-north-1.yml

Additionally, this is my template.yml:

AWSTemplateFormatVersion: '2010-09-09'
Parameters:
  pAccountIds1:
    Description: First 100 list of member account ids to grant CloudTrail log access.
    Type: String
    Default: ''
Outputs:
  Main:
    Description: Cloudtrail filter for the first 100 member accounts.
    Value: !Ref pAccountIds1
Resources:
  nestedCloudTrailFilter:
    Type: AWS::CloudFormation::Stack
    Properties:
      Parameters:
        pAccountIds1: !Ref pAccountIds1
      TemplateURL: nested_cloudtrail_filter_template.yml
  nestedCloudTrailPermission:
    Type: AWS::CloudFormation::Stack
    Properties:
      Parameters:
        pAccountIds1: !Ref pAccountIds1
      TemplateURL: nested_cloudtrail_permission_template.yml

I suspect that the bucket variable might be a list instead of a dictionary, leading to the error when trying to access its get method.

Could someone please help me understand why this error is happening and how to fix it? Any insights or suggestions would be greatly appreciated. Thank you!