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?
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.
aws lambda get-function --function-name my_lambda
echo $?
And you can use it like below: (paste this in your terminal)
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