OSS contributors who clone molecule-core and `go run ./workspace-server/cmd/server`
now get a working end-to-end provision without authenticating to GHCR or AWS ECR.
Pre-fix: with MOLECULE_IMAGE_REGISTRY unset, the provisioner attempted to pull
ghcr.io/molecule-ai/workspace-template-<runtime>:latest, which has been
returning 403 since the 2026-05-06 GitHub-org suspension.
Post-fix: when MOLECULE_IMAGE_REGISTRY is unset, the provisioner switches to
local-build mode — looks up the workspace-template-<runtime> repo's HEAD sha
on Gitea via a single API call, shallow-clones into ~/.cache/molecule/, and
runs `docker build --platform=linux/amd64`. SHA-pinned cache key skips the
clone+build entirely on subsequent provisions.
Production tenants are unaffected: every prod tenant sets the var to its
private ECR mirror, so the SaaS pull path is byte-for-byte identical.
SSOT for mode detection lives in Resolve() (registry_mode.go) returning a
discriminated RegistrySource{Mode, Prefix} so call sites that branch on
mode get a compile-time push instead of a string-equality footgun.
Coverage:
* registry_mode.go — new SSOT (Resolve, RegistryMode, IsKnownRuntime)
* registry_mode_test.go — 8 tests pinning mode-decision contract
* localbuild.go — clone+build pipeline (570 LOC, fully unit-tested)
* localbuild_test.go — 22 tests covering happy/sad paths, fail-closed
* provisioner.go — Start() inserts ensureLocalImageHook in local mode
* docs/adr/ADR-002 — design rationale + alternatives + security review
* docs/development/local-development.md — local-build flow + env overrides
Security:
* Allowlist-only runtime names (knownRuntimes) gate the clone path.
* Repo prefix hardcoded to git.moleculesai.app/molecule-ai/molecule-ai-workspace-template-;
forks via opt-in MOLECULE_LOCAL_TEMPLATE_REPO_PREFIX.
* MOLECULE_GITEA_TOKEN masked in every log line via maskTokenInURL/maskTokenInString.
* Fail-closed: Gitea unreachable / runtime not mirrored → clear error, never
silently fall back to GHCR/ECR.
* docker build invocation passes no --build-arg from external input.
* HTTP body cap 64KB on Gitea API responses (defence vs malicious upstream).
Closes#63 / Task #194.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
