awsreboot

#!/bin/bash
#
# Reboot an AWS instance, given an aws ec2 listing pattern match string
#
# Depends on:
# 1) ec2list and clear_cache executables
# 2) awscli python package and "aws" executable
#

set -o errexit
set -o nounset
set -o pipefail

instance_search_string="${1:-}"

if [ ! "$instance_search_string" ]
then
  echo "usage: $0 <instance_search_string>"
  exit 2
fi

if [ ! "$AWS_SECRET_ACCESS_KEY" -o ! "$AWS_ACCESS_KEY_ID" ]
then
  . ~/amazon-build.sh
fi

header=$(ec2list | head -1)
data=$(ec2list $instance_search_string | tail -1)

# account for weird lost data
#
if [ \( ! "$data" \) -o "$(echo \"$data\" | grep running,\*$)" -o "$data" = "$header" ]
then
  echo "retrying to poll aws data"
  clear_cache
  header=$(ec2list | head -1)
  data=$(ec2list $instance_search_string | tail -1)
fi

# get column numbers
id_column="$(echo "$header"  | tr , \\n | grep -n InstanceId | cut -f1 -d: )"
state_column="$(echo "$header"  | tr , \\n | grep -n State.Name | cut -f1 -d: )"

id="$(echo "$data" | cut -f$id_column -d,)"
state="$(echo "$data" | cut -f$state_column -d,)"

if [ ! "$id" -o "$id" = "running" ]
then
  echo "Can't find dns info for server (id: $id, data: $data)"
  exit 3
fi

if [ "$state" != "running" ]
then
  echo "Invalid state to reboot instance from: $state"
  exit 4
fi

echo aws ec2 reboot-instances --instance-id $id
aws ec2 reboot-instances --instance-id $id