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fix(ci): ensure no gap during AMI replacement

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When an AMI name collision occurs during image creation, use a safe
replacement strategy:
1. Create temp image with unique name
2. Wait for temp image to be available
3. Copy temp image to final name
4. Wait for final image to be available
5. Only then deregister old and temp images

This ensures CI jobs always have a working AMI available during
the daily image rebuild - the old image is kept until the new
one is fully ready.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Claude Bot
2026-01-17 09:14:24 +00:00
parent f605257804
commit f49229f2ef
1 changed files with 23 additions and 2 deletions
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25
scripts/machine.mjs
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@@ -224,6 +224,7 @@ const aws = {
*/
async createImage(options) {
const flags = aws.getFlags(options);
const finalName = options?.name;
/** @type {string | undefined} */
let existingImageId;
@@ -246,9 +247,29 @@ const aws = {
return ImageId;
}
// Name collision: create with temp name, wait for availability, copy with final name,
// then deregister old and temp images. This ensures no gap where the image is unavailable.
const tempName = `${finalName}-temp-${Date.now()}`;
const tempFlags = aws.getFlags({ ...options, name: tempName });
const { ImageId: tempImageId } = await aws.spawn($`ec2 create-image ${tempFlags}`);
// Wait for temp image to be available
await aws.waitImage("image-available", tempImageId);
// Copy temp image to final name
const region = process.env.AWS_REGION || process.env.AWS_DEFAULT_REGION || "us-east-1";
const { ImageId: finalImageId } = await aws.spawn(
$`ec2 copy-image --source-image-id ${tempImageId} --source-region ${region} --name ${finalName}`,
);
// Wait for final image to be available
await aws.waitImage("image-available", finalImageId);
// Now safe to deregister old and temp images
await aws.spawn($`ec2 deregister-image --image-id ${existingImageId}`);
const { ImageId } = await aws.spawn($`ec2 create-image ${flags}`);
return ImageId;
await aws.spawn($`ec2 deregister-image --image-id ${tempImageId}`);
return finalImageId;
},
/**