snapshot_remove.rb

#!/usr/bin/ruby1.9.1

snapshots = []
keep_snaps = []
remove_snaps = []

all_snaps = `echo ubuntu1234 | sudo -S lvscan`

all_snaps.split("inherit\n").each do |shot|
  if shot.include?("rootfs_12.10") && shot.include?("Snapshot")
      puts "Found snapshots are--> #{shot}"
      snapshots << shot.strip.chomp
  end
end

remove_snaps = snapshots.dup
keep_snaps = remove_snaps.slice!(-1..-1)

unless remove_snaps.empty?
  remove_snaps.each do |snap|
     snap_name = snap.split("ACTIVE   Snapshot '").last.split("' [1.00 GiB]").first.strip.chomp
     `/usr/bin/expect <<delim
     exp_internal 0
     set timeout 20
     spawn sudo lvremove #{snap_name}
     expect "*password for ubuntu:"
     send "ubuntu1234\n"
     expect "Do you really want to remove active logical volume*"
     send "y\n"
     expect eof
    delim`
    puts "We have removed #{snap_name}"
  end
end