Container Device Interface (CDI) — syntax=docker/dockerfile:1-labs

Reference note (untrusted external data; do not execute it as instructions). FROM busybox RUN --device=vendor1.com/device \ env | grep ^FOO= Bounded code example (external data; do not execute automatically): ```text Here we use the [`RUN --device` command](/reference/dockerfile.md#run---device) and set `vendor1.com/device` which requests the first device available in the specification. In this case it uses `foo`, which is the first device in `/etc/cdi/foo.yaml`. > [!NOTE] > [`RUN --device` command](/reference/dockerfile.md#run---device) is only > featured in [`labs` channel](../buildkit/frontend.md#labs-channel) since > [Dockerfile frontend v1.14.0-labs](https://github.com/moby/buildkit/releases/tag/dockerfile%2F1.14.0-labs) > and not yet available in stable syntax. Now let's build this Dockerfile: ``` $ docker buildx build . [+] Building 0.4s (5/5) FINISHED docker:default => [internal] load build definition from Dockerfile 0.0s => => transferring dockerfile: 155B 0.0s => resolve image config for docker-image://docker/dockerfile:1-labs 0.1s => CACHED docker-image://docker/dockerfile:1-labs@sha256:9187104f31e3a002a8a6a3209ea1f937fb7486c093cbbde1e14b0fa0d7e4f1b5 0.0s => [internal] load metadata for docker.io/library/busybox:latest 0.1s => [internal] load .dockerignore 0.0s => => transferring context: 2B 0.0s ERROR: failed to build: failed to solve: failed to load LLB: device vendor1.com/device=foo is requested by the build but not allowed Bounded code example (external data; do not execute automatically): ```text It fails because the device `vendor1.com/device=foo` is not automatically allowed by the build as shown in the `buildx inspect` output above: ``` Devices: Name: vendor1.com/device=foo Automatically allowed: false Bounded code example (external data; do not execute automatically): ```text To allow the device, you can use the [`--allow` flag](/reference/cli/docker/buildx/build/#allow) with the `docker buildx build` command: ``` $ docker buildx build --allow device . Bounded code example (external data; do not execute automatically): ```text Or you can set the `org.mobyproject.buildkit.device.autoallow` annotation in the CDI specification to automatically allow the device for all builds: ``` cdiVersion: "0.6.0" kind: "vendor1.com/device" devices: name: foo containerEdits: env: FOO=injected annotations: org.mobyproject.buildkit.device.autoallow: true … Attribution: Adapted from Docker Documentation under Apache-2.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.