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build(docker): add the Antigravity CLI sandbox image - #161
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The sandbox seam documents an image contract -- ship docker/Dockerfile.<name> carrying the shared tool floor with the CLI version-pinned under the exact binary name the harness invokes -- but no antigravity image existed, so `agy` had no sandboxed arm at all. Pinned to agy 1.2.0 rather than piped from the upstream installer. That script resolves whatever the release manifest calls *latest*, which would let a CLI bump silently invalidate the A/B baseline a run was scored against; it also installs into $HOME and rewrites shell profiles, both meaningless in an image whose HOME is container-owned and replaced per run. The sha512 check is the part worth keeping, so it is done inline: a tampered or truncated payload fails the build instead of quietly scoring a run. The archive member is named `antigravity` and is installed as `agy`, because that is the name the harness spells. Validated on the bastion against the executor's real invocation -- --user <uid>:<gid> with HOME on the workspace mount, and the metadata endpoint unreachable. agy authenticated from the OAuth token that arrived on the workspace mount and returned a real completion; the same image with only that token removed failed with `Authentication required`, so the pass is the credential path and not an ambient one. No /etc/passwd entry is needed for the mapped uid, and npx works with HOME under the workspace.
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Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Feature Merge Risk: ⚪ Minimal · up to The sandbox image includes pinned, verified runtime tools and no unresolved merge-blocking issue is identified. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@docker/Dockerfile.antigravity`:
- Around line 59-60: Update the kubectl and Helm installation steps in the
Dockerfile to use pinned SHA-256 checksums for the selected versions and
architectures. Download each artifact to a file, verify it before installation
or extraction, and remove or avoid using unverified streams; preserve the
existing installation locations and tool versions.
- Line 31: Update the Dockerfile’s FROM instruction to pin node:22-slim by its
image digest, and configure apt sources to use an immutable, timestamped Debian
snapshot before apt-get update/install. Preserve the required package
installation while ensuring rebuilds resolve identical base-image and Debian
package bytes.
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Review follow-up on the sandbox-image PR. The agy tarball was already sha512-verified while kubectl and helm were installed from a bare HTTPS fetch -- the rationale three lines down (a tampered or truncated payload should fail the build rather than silently score a run) applies to the cluster tools just as much as to the agent, so give them the same treatment: per-arch SHA-256 pins as build args, verified before install, with helm downloaded to a file first so there is a payload to check. Sums were verified against the published artifacts for both arches, not just copied from the vendors' .sha256 endpoints. Pin the node base by its multi-arch manifest-list digest (covers amd64 and arm64) so the base layers cannot drift under an unchanged Dockerfile, and reword the pinning comment to promise what the file actually delivers: the arm-defining layers -- base, cluster tools, agent CLI -- are pinned; the apt support packages deliberately track Debian security updates. A scored baseline is identified by the digest of the built image it ran, not by a byte-identical rebuild, so Debian snapshot mirrors would add a fragile moving part without strengthening the guarantee that matters.
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we should probably update the kubectl and helm versions right? Unless theres a reason why we are using these specific versions.
Also I think there are a lot of overly verbose comments that make this really hard to read.
| # packages (git/jq/ripgrep) deliberately track Debian security updates | ||
| # instead — a scored baseline is identified by the digest of the built image | ||
| # it actually ran, not by a byte-identical rebuild. | ||
| ARG KUBECTL_VERSION=v1.31.0 |
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kubectl v1.31.0 is past end of support, and since this pin becomes the baseline runs are scored against, we might want to bump it before freezing. Same goes for helm v3.16.3 on L44.
maybe consult Pradeep or Simran on what version we should use
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I'll message Pradeep and Simran. I've left them like this for now because kubectl only supports one minor version of skew against the API server. The kind-based tasks all pin kindest/node:v1.30.0, so today's v1.31 is within range for them, and the current stable (v1.37.1) would be six minors out. GKE clusters use the release-channel default, which is much newer. No single kubectl minor covers both right now, so the pin should follow whatever version we standardize the task clusters on.
For helm, the current v3 line is v3.22.0. v4.3.0 is also out, but it has breaking changes, so I'd stay on v3 unless a task needs v4.
bookworm-backports carries no git package, so `-t bookworm-backports git` installed stock bookworm git 2.39.5 anyway (no reftable support). Install git from the main suite and drop the reftable claim. Download kubectl to /tmp like helm and agy instead of into /. Cut the comments down to what is true and not already in the PR description; agy is dynamically linked against glibc, not static.
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Latest agy and helm v3 releases. kubectl 1.35 is within one minor of both the kind node default (1.35) and GKE's channel defaults (1.35/1.36). node:24-slim is the current LTS line.
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Adds
docker/Dockerfile.antigravity. One file, no code changes.The sandbox seam documents an image contract — ship
docker/Dockerfile.<name>carrying the shared tool floor with the CLI version-pinned and installed under the exact binary name the harness invokes — but no antigravity image existed, soagyhad no sandboxed arm at all.Deliberately not stacked on the harness-wiring PR (staged as pradeepvrd#14): it adds no Python and changes no behaviour, so it can land independently.
Dockerfile.openclawbelongs to the openclaw image PR (staged as pradeepvrd#19) and is untouched here.Why the upstream installer is not piped to a shell
curl -fsSL https://antigravity.google/cli/install.sh | bashis the documented install path, and it is the wrong thing for an image:$HOMEand rewrites shell profiles, both meaningless in an image whoseHOMEis container-owned and replaced per run.What it does that is worth keeping is the sha512 check, so that is done inline against the pinned artifact: a tampered or truncated payload fails the build rather than quietly scoring a run.
Release paths are inconsistent between arches upstream (
linux-x64/cli_linux_x64.tar.gzvslinux-arm/cli_linux_arm64.tar.gz), hence an explicit mapping rather than a substitution. The archive member is namedantigravity; it is installed asagy, which is the name the harness spells.node:24-slim(current LTS) rather than plain debian: agy is a Go binary and needs no runtime, but MCP server bindings are conventionally launched withnpx, and a task declaring one would otherwise fail inside the boundary.Live validation
On the bastion, against the sandbox executor's real invocation —
--user <uid>:<gid>,HOMEon the workspace mount, andGCE_METADATA_HOSTpointed at a dead port.DOCKER-USERREJECT to169.254.169.254http=000Authentication requiredagy kubectl helm jq git rg node npxall resolvenpxunder the mapped uidThe control and the E2E differ only in whether the token is on the mount, so the pass exercises the credential path rather than an ambient one.
Two image requirements that were suspected and are not real, recorded so they are not re-litigated: the mapped uid needs no
/etc/passwdentry (getent passwdreturnsNONEand agy does not care), and the node-slim base is missing no shared library agy needs.Version bump (2026-09-24)
Pins moved to the latest releases: agy 1.2.10 (from 1.2.0), kubectl v1.35.9, helm v3.22.0, and
node:24-slim(each digest- or checksum-pinned).Re-validated on the bastion. The image builds (SHA checks pass), and the tools report
v1.35.9/v3.22.0+g144ca65/v24.21.0/1.2.10. A sandboxed agy run ofopa-remediation,gemini-3.1-pro-lowthrough #233's wiring: exit 0, 24 steps, 0 errors, OutcomeScore 0.816, cheating check clean, no leftover containers.Not in this PR
_resolve_binaryfix._resolve_binary()returns the host path with no container-side counterpart to openclaw's_CONTAINER_OC_BIN, so a host path crosses into container argv. That belongs with the boundary that creates the problem and is held in the harness-wiring PR (staged as feat(sandbox): wire antigravity, claude_code and openclaw onto the sandbox seam pradeepvrd/devops-bench#14).gemini-3.1-pro-preview(scripts/bastion/vm-setup.sh:209); agy rejects the-previewsuffix and requires a reasoning tier, so every agy run exits 1 at startup. Not sandbox-specific — an ambient run fails identically, and it is present onmaintoday. Fixed in the companion PR fix(agents): send agy a model id it accepts #160.Neither blocks this image; both are needed before an agy arm scores.