Add an os-disk constraint

environs/ec2/instancetype.go

 // Copyright 2013 Canonical Ltd.
 // Licensed under the AGPLv3, see LICENCE file for details.
 
 package ec2
 
 import (
         "launchpad.net/goamz/aws"
         "launchpad.net/juju-core/environs/instances"
 )
 
 // Type of virtualisation used.
 var (
         paravirtual = "pv"
         hvm         = "hvm"
 )
 
 // all instance types can run amd64 images, and some can also run i386 ones.
 var (
         amd64 = []string{"amd64"}
         both  = []string{"amd64", "i386"}
 )
 
 // allRegions is defined here to allow tests to override the content.
 var allRegions = aws.Regions
+
+// TODO(bug 1212688): the RootDisk defaults to 8G currently until the
+// referenced bug is fixed, at which point RootDisk can be set to nil and the
+// specified constraint can be passed through via block device mapping to
+// request an appropriate resize of the root disk.
 
 // allInstanceTypes holds the relevant attributes of every known
 // instance type.
 var allInstanceTypes = []instances.InstanceType{
         { // First generation.
                 Name:     "m1.small",
                 Arches:   both,
                 CpuCores: 1,
                 CpuPower: instances.CpuPower(100),
                 Mem:      1740,
@@ skipping 269 matching lines @@
                 "m2.xlarge":   410,
                 "m2.2xlarge":  820,
                 "m2.4xlarge":  1640,
                 "c1.medium":   145,
                 "c1.xlarge":   580,
                 "cc2.8xlarge": 2400,
                 "cr1.8xlarge": 3500,
                 "hi1.4xlarge": 3100,
         },
 }