Two surfaces in workspace-server hardcoded `ghcr.io` and silently bypassed
the `MOLECULE_IMAGE_REGISTRY` env override that flips every other image
operation to the configured private mirror (e.g. AWS ECR in production):
1. internal/imagewatch/watch.go — image-auto-refresh polled
`https://ghcr.io/v2/...` and `https://ghcr.io/token` directly. Post-
suspension, with the platform pointed at ECR, the watcher silently
stopped seeing digest changes (every poll either 404'd or hung on a
registry it has no business talking to).
2. internal/handlers/admin_workspace_images.go — Docker Engine auth
payload pinned `serveraddress: "ghcr.io"`, so when the operator sets
`MOLECULE_IMAGE_REGISTRY=…ecr…/molecule-ai` the engine matched the
wrong credential entry on every authenticated pull.
Fix: extract `provisioner.RegistryHost()` returning the host portion of
`RegistryPrefix()` (e.g. `ghcr.io` ← `ghcr.io/molecule-ai`, or
`004947743811.dkr.ecr.us-east-2.amazonaws.com` ← the ECR mirror prefix),
and route both surfaces through it. Default behavior is unchanged for
OSS users on GHCR.
Tests
- New `TestRegistryHost_SplitsHostFromOrgPath` and
`TestRegistryHost_NeverEmpty` pin the helper across GHCR / ECR /
self-hosted Gitea / bare-host edge cases.
- New `TestGHCRAuthHeader_RespectsRegistryEnv` asserts the Docker auth
payload's `serveraddress` follows MOLECULE_IMAGE_REGISTRY (and never
leaks the org-path suffix).
- New `TestRemoteDigest_RegistryHostFollowsEnv` stands up an httptest
server, points MOLECULE_IMAGE_REGISTRY at it, and confirms both the
token endpoint and the manifest HEAD land there — i.e. the full image-
watch loop respects the env override end-to-end.
Both new tests were verified to FAIL on the pre-fix code path before the
helper was wired in, so a future revert can't silently re-introduce the
bug.
Out of scope (followup needed)
ECR uses `aws ecr get-authorization-token` (SigV4 + basic-auth) instead
of GHCR's `/token?service=…&scope=…` flow. This PR makes the URL host-
configurable; the bearer-token negotiation in `fetchPullToken` still
speaks the GHCR flavor. On ECR with `IMAGE_AUTO_REFRESH=true`, the
watcher will now fail loudly at the token fetch (logged per tick) rather
than silently hitting ghcr.io. Operators on ECR should keep
IMAGE_AUTO_REFRESH=false until ECR auth is wired — tracked as a separate
task. Net effect of this PR alone is strictly better than pre-fix:
fail-loud > silent-broken.
Refs: RFC #229 P2-4
tier:low
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
