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#!/usr/bin/python
#
# ubuntu-run-instances: ec2-run-instances that support human readable aliases for AMI's
#
# Copyright (C) 2011 Dustin Kirkland <kirkland@ubuntu.com>
#
# Authors: Dustin Kirkland <kirkland@ubuntu.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os, string, sys, urllib2
def parse_alias(word):
# BUG: cloud-images.ubuntu.com should maintain a current->oneiric symlink
# BUG: shall we debate these defaults?
alias = {"release":"oneiric", "flavor":"server", "age":"daily", "rootstore":"ebs"}
parts = string.split(word, ",")
# Autodetct the alias parts; allows for arbitrary ordering of options
for p in parts:
if p in ["server", "desktop"]:
alias["flavor"] = p
elif p in ["daily", "released"]:
alias["age"] = p
elif p in ["ebs", "instance-store"]:
alias["rootstore"] = p
else:
alias["release"] = p
return alias
def is_alias(aliases, word):
# An alias word is of the form:
# release[,flavor[,age[,rootstore]]]
# where:
# - release is one of [hardy|karmic|lucid|maverick|natty|oneiric], defaults to 'oneiric'
# - flavor is one of [server|desktop], defaults to 'server'
# - age is one of [daily|released], defaults to 'daily'
# - rootstore is one of [ebs|instance-store], defaults to 'ebs'
# Note that they can be in ANY comma-separated order!
alias = parse_alias(word)
for a in aliases:
parts = string.split(a)
if len(parts) > 3 and parts[0] == alias["release"] and parts[1] == alias["flavor"] and parts[2] == alias["age"]:
return True
return False
def get_region(args):
# Default to us-east-1 (least expensive option)
region = "us-east-1"
i = 0
# Look for a region option
while i < len(args):
if args[i] == "--region":
region = args[i+1]
i += 1
return region
def get_instance_type(args):
# Default to t1.micro (least expensive option)
instance_type = "t1.micro"
i = 0
# Look for an instance type option
while i < len(args):
if args[i] == "--instance-type" or args[i] == "-t":
instance_type = args[i+1]
i += 1
return instance_type
def get_arch(instance_type):
# Default to amd64 wherever possible
if instance_type in ["c1.medium", "m1.small"]:
return "i386"
else:
return "amd64"
def get_virt(instance_type):
# Default to paravirtual
if instance_type in ["cc1.4xlarge", "cg1.4xlarge"]:
return "hvm"
else:
return "paravirtual"
def get_ami(region, instance_type, alias):
alias = parse_alias(alias)
request = urllib2.Request("https://cloud-images.ubuntu.com/query/%s/%s/%s.current.txt" % (alias["release"], alias["flavor"], alias["age"]))
response = urllib2.urlopen(request)
arch = get_arch(instance_type)
virt = get_virt(instance_type)
for line in response.readlines():
parts = string.split(line)
if len(parts) > 9 and parts[0] == alias["release"] and parts[1] == alias["flavor"] and parts[2] == alias["age"] and parts[5] == arch and parts[4] == alias["rootstore"] and parts[6] == region and parts[9] == virt:
return parts[7]
return False
def get_aliases():
request = urllib2.Request("https://cloud-images.ubuntu.com/query/daily.latest.txt")
response = urllib2.urlopen(request)
image_aliases = []
for line in response.readlines():
image_aliases.append(line)
request = urllib2.Request("https://cloud-images.ubuntu.com/query/released.latest.txt")
response = urllib2.urlopen(request)
for line in response.readlines():
image_aliases.append(line)
return image_aliases
################################################################################
# 1) Obtain the list of valid aliases
image_aliases = get_aliases()
# 2) Search and replace valid aliases in argv with ami-* values
i = 0
while i < len(sys.argv):
if is_alias(image_aliases, sys.argv[i]):
r = get_region(sys.argv)
t = get_instance_type(sys.argv)
ami = get_ami(r, t, sys.argv[i])
if ami:
sys.argv[i] = ami
else:
print("Invalid AMI Alias [%s]" % sys.argv[i])
exit(1)
i += 1
# 3) Execute
#os.execv("/bin/echo", sys.argv)
os.execv("/usr/bin/ec2-run-instances", sys.argv)
################################################################################
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