s3-download.py

import urllib2
import boto
import re
import sys
from boto.s3.key import Key

if len(sys.argv) != 3:
  print "Usage: s3-download.py s3://bucket/path localfile"
  sys.exit(-1)
s3_url=sys.argv[1]
installer_jar=sys.argv[2]
r=re.search('s3://([^/]+)(.*)', s3_url)
if r == None:
  raise "Malformed S3 URL"
s3_bucket=r.group(1)
s3_path=r.group(2)

c = boto.connect_s3()
b = c.get_bucket(s3_bucket)
k = Key(b)
k.key = s3_path
print "downloading from S3 {0} to {1}".format(s3_url, installer_jar)
k.get_contents_to_filename(installer_jar)