Cant set CRON expression as parameter to cloudFormation stack

Question

I am facing issues with passing cron expression as parameter to stack. Seems parameter is getting evaluated to differently than expected. Below are details:

1. Reading cron expression from json file.

   { "CronSchedule":""cron(0 19 * * * *)"" }

2. Code snippet of my cloudformation stack.

     ScheduledRule: 
       Type: AWS::Events::Rule 
         Properties: 
         Description: ScheduledRule 
         Name: !Sub '${Environment}-${Platform}-${AppName}-${Prefix}-SCHEDULE-CAPTURE' 
         ScheduleExpression: !Sub ${CronSchedule} 
         State: "ENABLED"
   

3. AWS command executing:

   aws --region us-east-1 cloudformation deploy --template-file ./deployment/aws/cfn/cloudwatch-resources.yml --stack-name QA-DUMMYAPP-CLOUD-WATCH --parameter-overrides Owner=DUMMYAPP AppID=C4E7876D-1BF6-0090-868C-A8E82D4BCBCD BU=DJI AppName=DUMMYAPP Platform=T3 LambdaStackName=QA-DUMMYAPP-LAMBDA ApiGwResourcesStackName=QA-DUMMYAPP-API-GW-RESOURCES CloudWatchStackName=QA-DUMMYAPP-CLOUD-WATCH FeedStateMachineStackName=STACK_NAME Environment=QA CronSchedule="cron(0 19 * * * *)" --no-fail-on-empty-changeset

4. On AWS Console, cronShedule is displayed as below on the parameter tab.

   CronSchedule = *cron(0 19 config deployment pom.xml README.md scripts src config deployment pom.xml README.md scripts src config deployment pom.xml README.md scripts src )

The issue seems to be * is replaced with directory/file names under the directory where cloudformation command is executed.

Any help would be appreciated.

Answer 1

It works for me passing the variable like this:

CronSchedule="'cron(0 19 * * * *)'"

Answer 2

You should use the wildcard in the expression. Check the following link Schedule Expressions for Rules