docker-knowledge-patch
Docker changes since training cutoff (latest: 0.31.0) — Rego source policies, bake --var flag, semvercmp function, env lookup disable. Load before working with Docker.
What this skill does
# Docker Knowledge Patch
Claude Opus 4.6 knows Docker Engine through 24.x and Compose through 2.x. This skill provides features from Buildx 0.31.0 (2026-01-22).
## Index
| Topic | Reference | Key features |
|---|---|---|
| Buildx & Bake | [references/buildx-bake.md](references/buildx-bake.md) | Rego source policies, `--var` flag, `semvercmp`, env lookup disable |
---
## Quick Reference
### Source policy enforcement with Rego (Buildx 0.31.0)
Buildx enforces build policies written in Rego (Open Policy Agent). Policies control what sources/images are allowed during builds.
```bash
# Explicit policy file
docker buildx build --policy policy.rego .
# Auto-loads Dockerfile.rego or app.Dockerfile.rego alongside the Dockerfile
docker buildx build -f app.Dockerfile .
# Evaluate and test policies
docker buildx policy eval
docker buildx policy test
```
In Bake, use the `policy` key or rely on auto-loading:
```hcl
# docker-bake.hcl
target "app" {
dockerfile = "Dockerfile"
policy = "policy.rego"
}
```
---
### Bake `--var` flag (Buildx 0.31.0)
Set HCL variables directly from the command line instead of using environment variables:
```bash
docker buildx bake --var FOO=bar --var VERSION=1.2.3
```
---
### Bake `semvercmp` function (Buildx 0.31.0)
Stdlib function for semantic version comparisons in Bake HCL files.
---
### Bake env lookup disable (Buildx 0.31.0)
Option to prevent Bake from reading host environment variables, useful for reproducible builds.
---
## Reference Files
| File | Contents |
|---|---|
| [buildx-bake.md](references/buildx-bake.md) | Rego source policy enforcement (auto-loading, explicit `--policy`, `policy eval`/`test`, Bake `policy` key), `--var` flag for HCL variables, `semvercmp` stdlib function, env lookup disable |
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