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Merged
merged 1 commit into from
Sep 15, 2020
Merged

#34 fail stack creation if python not configured #35

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21 changes: 19 additions & 2 deletions design-patterns/cloudformation/UserData.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -118,10 +118,21 @@ function configure_python_and_install
/usr/bin/pip-3.6 install -r /home/ec2-user/workshop/requirements.txt

log frustrating pip user installs
mkdir /home/ec2-user/.local
mkdir /home/ec2-user/.local 1>&2 2>/dev/null
chattr +i /home/ec2-user/.local

}
function verify_configuration_and_signal
{
log verify_configuration_and_signal running.
log Checking if python36 installed by yum.
yum list installed python36 1>/dev/null || signal_failure_and_exit "Python3.6 not installed correctly."

log Checking if python scripts are in workshop directory.
ls -l /home/ec2-user/workshop/*.py 1>/dev/null || signal_failure_and_exit "Python scripts not in workshop directory."

signal_success
}
function lock_instance
{
cat > /etc/profile.d/motd.sh << "EOF"
Expand Down Expand Up @@ -171,6 +182,12 @@ function signal_success
{
/opt/aws/bin/cfn-signal --success true $CFN_WAIT_HANDLE
}
function signal_failure_and_exit
{
/opt/aws/bin/cfn-signal --success false $CFN_WAIT_HANDLE --reason "$@"
log failure signal sent to CloudFormation: "${@}"
exit 0
}

#Main Execution
lock_instance
Expand All @@ -183,5 +200,5 @@ lock_repo_version
update_yum_packages

configure_python_and_install
verify_configuration_and_signal
unlock_instance
signal_success