opscode/knife-ec2 — pull request #264 by prabhu-das (2014-11-27 10:54:49+00:00)
Title: Security group id patch

A single security group given as a string i.e. knife[:security_group_ids]= 'sg-0172f169'
fails when specified in knife.rb. A patch has been applied for this in ec2 server create.