snappywrapper

#!/bin/bash
# Wrapper script to run rolling backups using ec2-create-rolling-snapshot script
# needs 'multiverse' enabled (using AWS sources) to install ec2-api-tools
# which itself pulls in java
# Also needs custom script ec2-create-rolling-snapshot in the path
# (has been put in /usr/local/ec2 along with the official ec2 stuff)

set -e

ALERT_EMAIL="alerts@EXAMPLE.COM"

errorb(){
    echo !! exited abnormally with args: $@
    echo -e "The rolling snapshots controlled by '${HOSTNAME}' exited abnormally, using settings:\n\n $@" | mail -s "${HOSTNAME} ERROR: rolling snapshot error" $ALERT_EMAIL
}
trap 'errorb $@' ERR # vars must be in single quotes with traps

export JAVA_HOME='/usr'
export EC2_HOME='/usr/local/ec2'
export EC2_URL='ec2.ap-southeast-1.amazonaws.com'
export PATH="$PATH:$EC2_HOME/bin"
##'backup' user in AWS IAM console:
# dynamic key access
# '\K' in grep kills the matching part so far, returning the rest of the match
role=$(curl -s http://169.254.169.254/latest/meta-data/iam/info |\
         grep -Po '"InstanceProfileArn" : "\K[^\"]*' |\
         xargs basename)
export AWS_ACCESS_KEY=$(curl -s http://169.254.169.254/latest/meta-data/iam/security-credentials/$role | grep -Po '"AccessKeyId" : "\K[^\"]*')
export AWS_SECRET_KEY=$(curl -s http://169.254.169.254/latest/meta-data/iam/security-credentials/$role | grep -Po '"SecretAccessKey" : "\K[^\"]*')


#echo "role=$role, key=$AWS_ACCESS_KEY, secret=$AWS_SECRET_KEY"


# $@ = all args passed through
ec2-create-rolling-snapshot "$@" > /dev/null