Question:
How do I do a one-time check if a lambda function exists via the CLI? I saw this function-exists option – https://docs.aws.amazon.com/cli/latest/reference/lambda/wait/function-exists.html
But it polls every second and returns a failure after 20 failed checks. I only want to check once and fail if it isn’t found. Is there a way to do that?
Answer:
You can check the exit code of get-function in bash. If the function does not exists it returns exit code 255 else it returns 0 on success.
e.g.
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aws lambda get-function --function-name my_lambda echo $? |
And you can use it like below:
(paste this in your terminal)
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function does_lambda_exist() { aws lambda get-function --function-name $1 > /dev/null 2>&1 if [ 0 -eq $? ]; then echo "Lambda '$1' exists" else echo "Lambda '$1' does not exist" fi } does_lambda_exist my_lambda_fn_name |