1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
#!/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, tags):
"""Create an EBS snapshot"""
client = boto3.client('ebs', region_name=region)
snapshot = client.start_snapshot(VolumeSize=1,
Description=description,
Tags=tags)
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 delete_images(region, filters, retain):
client = boto3.client('ec2', region_name=region)
resource = boto3.resource('ec2', region_name=region)
images = client.describe_images(Owners=['self'], Filters=filters)
old_images = sorted(images['Images'], key=lambda x: x['CreationDate'])
if retain > 0:
old_images = old_images[:-retain]
for image in old_images:
image_id = image['ImageId']
snapshot_id = image['BlockDeviceMappings'][0]['Ebs']['SnapshotId']
resource.Image(image_id).deregister()
resource.Snapshot(snapshot_id).delete()
def import_image(region, name, family, architecture, image, public, overwrite,
retain):
"""Import an AMI image"""
client = boto3.client('ec2', region_name=region)
resource = boto3.resource('ec2', region_name=region)
description = '%s (%s)' % (name, architecture)
tags = [
{'Key': 'family', 'Value': family},
{'Key': 'architecture', 'Value': architecture},
]
if overwrite:
filters = [{'Name': 'name', 'Values': [description]}]
delete_images(region=region, filters=filters, retain=0)
if retain is not None:
filters = [
{'Name': 'tag:family', 'Values': [family]},
{'Name': 'tag:architecture', 'Values': [architecture]},
{'Name': 'is-public', 'Values': [str(public).lower()]},
]
delete_images(region=region, filters=filters, retain=retain)
snapshot_id = create_snapshot(region=region, description=description,
image=image, tags=tags)
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,
TagSpecifications=[{
'ResourceType': 'image',
'Tags': tags,
}],
RootDeviceName='/dev/sda1',
SriovNetSupport='simple',
VirtualizationType='hvm')
image_id = image['ImageId']
client.get_waiter('image_available').wait(ImageIds=[image_id])
if public:
image_block = client.get_image_block_public_access_state()
if image_block['ImageBlockPublicAccessState'] != 'unblocked':
client.disable_image_block_public_access()
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('--family', '-f',
help="Image family 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('--retain', type=int, metavar='NUM',
help="Retain at most <NUM> old images")
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 family name if none specified
if not args.family:
args.family = 'iPXE'
# Use default name if none specified
if not args.name:
args.name = '%s (%s)' % (args.family, 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,
family=args.family,
architecture=architectures[image],
image=image,
public=args.public,
overwrite=args.overwrite,
retain=args.retain): (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)]
))
|
