AWS Elastic Beanstalk and Whenever Gem - ruby-on-rails

Question

I have a Rails 4.2.1 app, using Ruby 2.2. I'm trying to use the Whenever Gem to update cron tasks on my Elastic Beanstalk from my code base. I've followed a few resources from AWS where you can add files to the .ebextensions folder and use EB's post deployment hook via shell files. Here are a couple resources:
https://forums.aws.amazon.com/thread.jspa?threadID=137136
http://www.dannemanne.com/posts/post-deployment_script_on_elastic_beanstalk_restart_delayed_job
http://blog.endpoint.com/2015/01/elastic-beanstalk-whenever.html
Following the blog articles, I added the file below, uncommented the gitignore line about files in the .ebextensions folder, and deployed my app. Unfortunatley, I have been able to see any changes. I've checked the log files (log/eb-tools.log, log/cron, etc.), and grepped all the log files for the shell file I create, whenever, and more. No luck though.
commands:
create-post-dir:
command: "mkdir /opt/elasticbeanstalk/hooks/appdeploy/post"
ignoreErrors: true
files:
"/opt/elasticbeanstalk/hooks/appdeploy/post/99_update_cron.sh"
mode: "000755"
owner: root
group: root
content: |
#!/usr/bin/env bash
# Using similar syntax as the appdeploy pre hooks that is managed by AWS
# Loading environment data
EB_SCRIPT_DIR=$(/opt/elasticbeanstalk/bin/get-config container -k script_dir)
EB_SUPPORT_DIR=$(/opt/elasticbeanstalk/bin/get-config container -k support_dir)
EB_APP_USER=$(/opt/elasticbeanstalk/bin/get-config container -k app_user)
EB_APP_CURRENT_DIR=$(/opt/elasticbeanstalk/bin/get-config container -k app_deploy_dir)
EB_APP_PIDS_DIR=$(/opt/elasticbeanstalk/bin/get-config container -k app_pid_dir)
# Setting up correct environment and ruby version so that bundle can load all gems
. $EB_SUPPORT_DIR/envvars
. $EB_SCRIPT_DIR/use-app-ruby.sh
# Now we can do the actual restart of the worker. Make sure to have double quotes when using env vars in the command.
su -c "cd $EB_APP_CURRENT_DIR; bundle exec whenever --update-cron --set='environment=$RACK_ENV'" - $EB_APP_USER
How can I make sure this shell file is getting called? Can I test it without a new deployment each time? Also, I'm open to other options if the Whenever gem is not the best option. I mainly want to be able to have my cron tasks managed in code and under version control.
Thanks in advance!
UPDATE:
I had a type on the .ebextensions folder, which was causing it to not be added. After that was fixed, I was able to read error messages, and create a cron script that updated the crontab using the Whenever gem.

Answer 1

I was able to figure this out after fixing a typo in my .ebextensions folder name. Afterwards, the scripts got compiled, and log messages started to appear. After reading the log messages, I came up with the following config script (.ebextensions/01_cron.config):
files:
"/opt/elasticbeanstalk/hooks/appdeploy/post/01_cron.sh":
mode: "000755"
owner: root
group: root
content: |
#!/usr/bin/env bash
# Using similar syntax as the appdeploy pre hooks that is managed by AWS
set -xe
EB_SCRIPT_DIR=$(/opt/elasticbeanstalk/bin/get-config container -k script_dir)
EB_SUPPORT_DIR=$(/opt/elasticbeanstalk/bin/get-config container -k support_dir)
EB_DEPLOY_DIR=$(/opt/elasticbeanstalk/bin/get-config container -k app_deploy_dir)
. $EB_SUPPORT_DIR/envvars
. $EB_SCRIPT_DIR/use-app-ruby.sh
cd $EB_DEPLOY_DIR
su -c "bundle exec whenever --update-cron"
su -c "crontab -l"