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[PILOT-00] Record offline gVisor build feasibility - #507
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThis change adds a Linux probe that builds a pinned sample image offline with Kaniko under gVisor, then runs a separate offline oracle. It records probe evidence, the host-specific BuildKit comparison, operational recommendations, and deployment limits. ChangesOffline gVisor probe
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Other Sequence Diagram(s)sequenceDiagram
participant probe.sh
participant Docker-in-Docker
participant runsc
participant Kaniko
participant oracle.sh
participant evidence.json
probe.sh->>Docker-in-Docker: Start the owned probe harness
Docker-in-Docker->>runsc: Launch the constrained builder
runsc->>Kaniko: Build the sample image without network access
probe.sh->>Docker-in-Docker: Run the separate oracle container
Docker-in-Docker->>runsc: Launch the oracle under gVisor
runsc->>oracle.sh: Check payload, digest, and isolation
probe.sh->>evidence.json: Record probe results and measurements
Suggested reviewers: Merge Risk: ⚪ Minimal · up to The offline feasibility probe is ready to merge after normal checks. Its documented measurements remain limited to the stated host and small fixture. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 22 functions across 5 files. (2 skipped: 2 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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This was referenced Oct 8, 2026
Abiorh001
marked this pull request as ready for review
October 8, 2026 12:56
abiorh-claw
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October 8, 2026 13:32
abiorh-claw
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Oct 8, 2026
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Inline comments:
Review comments at @experiments/pilot00_gvisor_offline/probe.sh:
- Around line 176-183: Update the readiness loop in the inner Docker startup
flow to detect when all 45 attempts fail, then exit explicitly with a diagnostic
naming the inner daemon and container before the runtime-check pipeline runs.
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Problem and result
PILOT-04/PILOT-06 need an offline image-build boundary before the external launcher design can be fixed. This spike proves that the included digest-pinned Alpine fixture can build with maintained Kaniko inside gVisor with networking disabled and no host container socket, then pass its oracle in a separate gVisor sandbox.
The builder is a non-privileged Docker container running as root inside gVisor with only
CHOWN,DAC_OVERRIDE,FOWNER, andSYS_CHROOT. The oracle runs as UID 65532 with no capabilities and a read-only root. A privileged, networkless outer Docker-in-Docker container is used only as trusted development infrastructure to registerrunsc; it is not evidence that a whole deployment is privilege-free.This adds a reproducible experiment, the measured engineering recommendation, and a narrow roadmap/Commitrail reconciliation. It changes no product, backend, schema, authority, workflow, or production runtime path.
Evidence
On Linux 6.8 x86_64 with Docker 29.1.3 and
runsc release-20260928.0:0B / 0Bnetwork I/O.afc06f12ed50606372147a97824467ec448d28037ab8a5baa8dc26616b844c81.Rootless BuildKit failed subordinate user-namespace setup under both the gVisor probe and an ordinary
runccontrol on this host. The recommendation therefore selects maintained Kaniko plus a second gVisor sandbox for the pilot, without making a general BuildKit portability claim.The probe refuses pre-existing foreign same-name volumes before harness mount/start and validates evidence IDs before filesystem or Docker access. Focused collision probes preserved foreign volume data/labels, created no harness container, and made zero Docker calls for
../../input. Harness startup now reports a specific error after exactly 45 failed inner-daemon readiness attempts, before querying the runtime inventory.Validation
prepareand complete positive/negativerunmatrix.bash -nforprobe.sh,daemon_ready.sh,oracle.sh, andtest_probe.sh.b169e83f816bba417fc0618a6e2d419acb2f94ed.47e81b46ce1018fd6c7e8c9d0f89a6fdb1bf1de0; fresh required checks for that head are running.The current head is reconciled with
mainb169e83f816bba417fc0618a6e2d419acb2f94ed. The measured runtime matrix predates the current-base reconciliation and daemon-readiness diagnostic repair; those later changes were reviewed with source, integration, and focused guard tests rather than represented as another gVisor matrix run.Limits
The measurements cover a tiny Alpine fixture. They do not establish representative Terminal-Bench limits, hosted hardening, cleanup after host loss, byte-reproducible image output, concurrency, or macOS/Apple Silicon behavior. Ordinary Docker Desktop remains an explicitly recorded
docker-devfallback and is not gVisor proof. PILOT-04 owns the final transport/failure contract and must benchmark an adjudicated representative task.Refs #500. Informs #491 and #493.
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