Legacy code from Oct 5 2012. Deleting registered ec2 snapshots by first unregistering the ami and then deleting the snapshot.

ec2-delete-registered-snapshot

#!/usr/bin/env ruby -W0
# -W0 = disable Ruby “Insecure world writable dir” warnings

# ec2-delete-registered-snapshot
#
# This is a simple timesaver script for deleting registered snapshots by
# first unregistering the ami and then deleting the snapshot.
# I use it for the EBS based backups that I create by another script.
#
# The ec2-descripe-snapshots output is as follows:
# SNAPSHOT  snap-12345678   vol-90abcdef    completed   2010-07-27T21:52:51+0000    100%    266627911898    15  Created by CreateImage(i-87654321) for ami-abcdefab from vol-90abcdef

if __FILE__ == $0
  snapshot = ARGV[0]
  output = `ec2-describe-snapshots #{snapshot}`
  if output =~ /for\s(ami-.+)\sfrom/
    #puts "We found #{$&} via\n#{$1}"
    ami = $1
    #puts ami
    if output =~ /.+?\s+?.+?\s+?.+?\s+?.+?\s+?(.+?)\s+?/ 
      snapdate = $1
    end
    puts "#{snapshot} created on #{snapdate} is #{ami} will be deregistered and deleted\n"
    # deregister the ami
    result = `ec2-deregister #{ami}`
    puts result
    # delete the snapshot
    result = `ec2-delete-snapshot #{snapshot}`
    puts result    
  else 
    puts "No ami found for #{snapshot}.\n"
  end
  puts "bye...\n"
end