aws-cli-functions.sh

#!/bin/bash

function F_get_instance_state {
    aws ec2 describe-instances --instance-id $1 | jq -r ".Reservations[0].Instances[0].State.Name"
}

function F_get_volume_state {
    aws ec2 describe-volumes --volume-ids $1 | jq -r ".Volumes[0].State"
}

function F_get_instance_public_ip {
    aws ec2 describe-instances --instance-ids $1 | jq -r ".Reservations[0].Instances[0].PublicIpAddress"
}

function F_get_volume_id_from_instance {
    aws ec2 describe-volumes --filters Name=attachment.instance-id,Values=$1  | jq -r ".Volumes[0].VolumeId"
}

function F_create_volume_from_snapshot {
    aws ec2 create-volume --availability-zone eu-west-1a --snapshot-id $1 \
        --tag-specifications "ResourceType=volume,Tags=[{Key=Name,Value=$2}]" \
        --volume-type gp2 | jq -r ".VolumeId"
}

function F_wait_for_instance_state {
    local I_ID=$1
    local STATE=$2
    while [ $(F_get_instance_state $I_ID ) != $STATE ]; do
        echo "Waiting for instance $I_ID $STATE state... Current state:" $(F_get_instance_state $I_ID)
        sleep 1
    done
}

function F_wait_for_volume_state {
    local V_ID=$1
    local STATE=$2
    while [ $(F_get_volume_state $V_ID) != $STATE ]; do
        echo "Waiting for volume $V_ID $STATE state... Current state " $(F_get_volume_state $V_ID)
        sleep 1
    done
}

OLD_VOLUME_ID=$( F_get_volume_id_from_instance $TARGET_EC2_INSTANCE_ID)

NEW_VOLUME_ID=$(F_create_volume_from_snapshot $CLEAN_UBUNTU_INSTALL_SNAPSHOT_ID $NEW_VOL_NAME)

aws ec2 stop-instances --instance-ids $TARGET_EC2_INSTANCE_ID

F_wait_for_instance_state $TARGET_EC2_INSTANCE_ID "stopped"
aws ec2 detach-volume --volume-id $OLD_VOLUME_ID

F_wait_for_volume_state $NEW_VOLUME_ID "available"
aws ec2 attach-volume --volume-id $NEW_VOLUME_ID --instance-id $TARGET_EC2_INSTANCE_ID --device /dev/sda1 | jq .

F_wait_for_volume_state $NEW_VOLUME_ID "in-use"
aws ec2 start-instances --instance-ids $TARGET_EC2_INSTANCE_ID | jq .

F_wait_for_instance_state $TARGET_EC2_INSTANCE_ID "running"
INSTANCE_PUBLIC_IP=$(F_get_instance_public_ip $TARGET_EC2_INSTANCE_ID)

scp -o "UserKnownHostsFile /dev/null" -o "StrictHostKeyChecking no" -i $INSTANCE_SSH_KEY deploy/install_environment.sh ubuntu@$INSTANCE_PUBLIC_IP:/home/ubuntu/
ssh -t -o UserKnownHostsFile=/dev/null -o "StrictHostKeyChecking no" -i $INSTANCE_SSH_KEY ubuntu@$INSTANCE_PUBLIC_IP "sudo /home/ubuntu/install_environment.sh"