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[cloud] Omit uploading empty blocks to EBS snapshots

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2026-03-23 15:34:41 +00:00
parent 5921e6b453
commit a0bf3f1cc8
1 changed files with 6 additions and 1 deletions
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7
contrib/cloud/aws-import
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@ -12,6 +12,7 @@ import subprocess
import boto3
BLOCKSIZE = 512 * 1024
EMPTY_CHECKSUM = b64encode(sha256(b'\0' * BLOCKSIZE).digest()).decode()
def detect_architecture(image):
@ -30,6 +31,7 @@ def create_snapshot(region, description, image, tags):
Description=description,
Tags=tags)
snapshot_id = snapshot['SnapshotId']
changed = 0
with open(image, 'rb') as fh:
for block in count():
data = fh.read(BLOCKSIZE)
@ -37,14 +39,17 @@ def create_snapshot(region, description, image, tags):
break
data = data.ljust(BLOCKSIZE, b'\0')
checksum = b64encode(sha256(data).digest()).decode()
if checksum == EMPTY_CHECKSUM:
continue
client.put_snapshot_block(SnapshotId=snapshot_id,
BlockIndex=block,
BlockData=data,
DataLength=BLOCKSIZE,
Checksum=checksum,
ChecksumAlgorithm='SHA256')
changed += 1
client.complete_snapshot(SnapshotId=snapshot_id,
ChangedBlocksCount=block)
ChangedBlocksCount=changed)
return snapshot_id