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#!/usr/bin/env python3
import argparse
from base64 import b64encode
from concurrent.futures import ThreadPoolExecutor, as_completed
from datetime import date
from hashlib import sha256
from itertools import count
import subprocess
import boto3
BLOCKSIZE = 512 * 1024
def detect_architecture(image):
"""Detect CPU architecture"""
mdir = subprocess.run(['mdir', '-b', '-i', image, '::/EFI/BOOT'],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
if any(b'BOOTAA64.EFI' in x for x in mdir.stdout.splitlines()):
return 'arm64'
return 'x86_64'
def create_snapshot(region, description, image):
"""Create an EBS snapshot"""
client = boto3.client('ebs', region_name=region)
snapshot = client.start_snapshot(VolumeSize=1,
Description=description)
snapshot_id = snapshot['SnapshotId']
with open(image, 'rb') as fh:
for block in count():
data = fh.read(BLOCKSIZE)
if not data:
break
data = data.ljust(BLOCKSIZE, b'\0')
checksum = b64encode(sha256(data).digest()).decode()
client.put_snapshot_block(SnapshotId=snapshot_id,
BlockIndex=block,
BlockData=data,
DataLength=BLOCKSIZE,
Checksum=checksum,
ChecksumAlgorithm='SHA256')
client.complete_snapshot(SnapshotId=snapshot_id,
ChangedBlocksCount=block)
return snapshot_id
def import_image(region, name, architecture, image, public, overwrite):
"""Import an AMI image"""
client = boto3.client('ec2', region_name=region)
resource = boto3.resource('ec2', region_name=region)
description = '%s (%s)' % (name, architecture)
images = client.describe_images(Filters=[{'Name': 'name',
'Values': [description]}])
if overwrite and images['Images']:
images = images['Images'][0]
image_id = images['ImageId']
snapshot_id = images['BlockDeviceMappings'][0]['Ebs']['SnapshotId']
resource.Image(image_id).deregister()
resource.Snapshot(snapshot_id).delete()
snapshot_id = create_snapshot(region=region, description=description,
image=image)
client.get_waiter('snapshot_completed').wait(SnapshotIds=[snapshot_id])
image = client.register_image(Architecture=architecture,
BlockDeviceMappings=[{
'DeviceName': '/dev/sda1',
'Ebs': {
'SnapshotId': snapshot_id,
'VolumeType': 'standard',
},
}],
EnaSupport=True,
Name=description,
RootDeviceName='/dev/sda1',
SriovNetSupport='simple',
VirtualizationType='hvm')
image_id = image['ImageId']
client.get_waiter('image_available').wait(ImageIds=[image_id])
if public:
resource.Image(image_id).modify_attribute(Attribute='launchPermission',
OperationType='add',
UserGroups=['all'])
return image_id
def launch_link(region, image_id):
"""Construct a web console launch link"""
return ("https://console.aws.amazon.com/ec2/v2/home?"
"region=%s#LaunchInstanceWizard:ami=%s" % (region, image_id))
# Parse command-line arguments
parser = argparse.ArgumentParser(description="Import AWS EC2 image (AMI)")
parser.add_argument('--name', '-n',
help="Image name")
parser.add_argument('--public', '-p', action='store_true',
help="Make image public")
parser.add_argument('--overwrite', action='store_true',
help="Overwrite any existing image with same name")
parser.add_argument('--region', '-r', action='append',
help="AWS region(s)")
parser.add_argument('--wiki', '-w', metavar='FILE',
help="Generate Dokuwiki table")
parser.add_argument('image', nargs='+', help="iPXE disk image")
args = parser.parse_args()
# Detect CPU architectures
architectures = {image: detect_architecture(image) for image in args.image}
# Use default name if none specified
if not args.name:
args.name = 'iPXE (%s)' % date.today().strftime('%Y-%m-%d')
# Use all regions if none specified
if not args.region:
args.region = sorted(x['RegionName'] for x in
boto3.client('ec2').describe_regions()['Regions'])
# Use one thread per import to maximise parallelism
imports = [(region, image) for region in args.region for image in args.image]
with ThreadPoolExecutor(max_workers=len(imports)) as executor:
futures = {executor.submit(import_image,
region=region,
name=args.name,
architecture=architectures[image],
image=image,
public=args.public,
overwrite=args.overwrite): (region, image)
for region, image in imports}
results = {futures[future]: future.result()
for future in as_completed(futures)}
# Construct Dokuwiki table
wikitab = ["^ AWS region ^ CPU architecture ^ AMI ID ^\n"] + list(
"| ''%s'' | ''%s'' | ''[[%s|%s]]'' |\n" % (
region,
architectures[image],
launch_link(region, results[(region, image)]),
results[(region, image)],
) for region, image in imports)
if args.wiki:
with open(args.wiki, 'wt') as fh:
fh.writelines(wikitab)
# Show created images
for region, image in imports:
print("%s %s %s %s" % (
region, image, architectures[image], results[(region, image)]
))
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