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pin agent container image instead of spawning from :latest #34

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pin agent container image instead of spawning from :latest #34

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c7f3d5c
pin agent container image instead of spawning from latest
michaelfward Jul 2, 2026
ab37679
pin the chromium buildid image tag instead of sha-short
michaelfward Jul 2, 2026
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8 changes: 8 additions & 0 deletions netlify/functions/lib/image-ref.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
// pinned agent container image, bumped by app-building's build-container workflow after each
// image push (or by hand). must be an immutable tag, never :latest - spawning from :latest made
// the fleet's browser version depend on whenever someone last happened to push app-building main
// (recordings ran on a 2-month-old chromium through late june because of this).
// tag format is <app-building git sha>-<baked chromium buildId>, so a bump diff shows the
// browser change directly. the CONTAINER_IMAGE_REF env var still wins, for one-off experiments.
export const PINNED_CONTAINER_IMAGE =
'ghcr.io/replayio/app-building:fbc4139-linux-chromium-20260701-712764864f08-af657e1966d8'
3 changes: 3 additions & 0 deletions netlify/functions/lib/spawn.ts
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Expand Up @@ -12,6 +12,7 @@ import {

import { getSql } from '../db.ts'
import { containerBaseUrl, containerAddressHeaders } from './container-backend.ts'
import { PINNED_CONTAINER_IMAGE } from './image-ref.ts'

const FLY_API_BASE = 'https://api.machines.dev/v1'

Expand Down Expand Up @@ -397,6 +398,8 @@ export async function spawnContainer(opts: SpawnContainerOptions, repo: RepoOpti
const config: ContainerConfig = {
infisical: opts.infisical,
registry,
// pin the agent image instead of letting the package default to :latest
imageRef: process.env.CONTAINER_IMAGE_REF || PINNED_CONTAINER_IMAGE,
flyToken: opts.flyToken,
flyApp: opts.flyApp,
detached: opts.detached,
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