$ export BUILDX_EXPERIMENTAL=1
```

### BUILDX_GIT_CHECK_DIRTY

{{< summary-bar feature_name="Buildx Git check dirty" >}}

When set to true, checks for dirty state in source control information for
[provenance attestations](/manuals/build/metadata/attestations/slsa-provenance.md).

Usage:

```console
$ export BUILDX_GIT_CHECK_DIRTY=1
```

### BUILDX_GIT_INFO

{{< summary-bar feature_name="Buildx Git info" >}}

When set to false, removes source control information from
[provenance attestations](/manuals/build/metadata/attestations/slsa-provenance.md).

Usage:

```console
$ export BUILDX_GIT_INFO=0
```

### BUILDX_GIT_LABELS

{{< summary-bar feature_name="Buildx Git labels" >}}

Adds provenance labels, based on Git information, to images that you build. The
labels are:

- `com.docker.image.source.entrypoint`: Location of the Dockerfile relative to
  the project root
- `org.opencontainers.image.revision`: Git commit revision
- `org.opencontainers.image.source`: SSH or HTTPS address of the repository

Example:

```json
  "Labels": {
    "com.docker.image.source.entrypoint": "Dockerfile",
    "org.opencontainers.image.revision": "5734329c6af43c2ae295010778cd308866b95d9b",
    "org.opencontainers.image.source": "git@github.com:foo/bar.git"
  }
```

Usage:

- Set `BUILDX_GIT_LABELS=1` to include the `entrypoint` and `revision` labels.
- Set `BUILDX_GIT_LABELS=full` to include all labels.

If the repository is in a dirty state, the `revision` gets a `-dirty` suffix.

### BUILDX_MEM_PROFILE

{{< summary-bar feature_name="Buildx mem profile" >}}

If specified, Buildx generates a `pprof` memory profile at the specified
location.

> [!NOTE]
> This property is only useful for when developing Buildx. The profiling data
> is not relevant for analyzing a build's performance.

Usage:

```console
$ export BUILDX_MEM_PROFILE=buildx_mem.prof
```

### BUILDX_METADATA_PROVENANCE

{{< summary-bar feature_name="Buildx metadata provenance" >}}

By default, Buildx includes minimal provenance information in the metadata file
through [`--metadata-file` flag](/reference/cli/docker/buildx/build/#metadata-file).
This environment variable allows you to customize the provenance information
included in the metadata file:
* `min` sets minimal provenance (default).
* `max` sets full provenance.
* `disabled`, `false` or `0` does not set any provenance.

### BUILDX_METADATA_WARNINGS

{{< summary-bar feature_name="Buildx metadata warnings" >}}

By default, Buildx does not include build warnings in the metadata file through
[`--metadata-file` flag](/reference/cli/docker/buildx/build/#metadata-file).
You can set this environment variable to `1` or `true` to include them.

### BUILDX_NO_DEFAULT_ATTESTATIONS

{{< summary-bar feature_name="Buildx no default" >}}

By default, BuildKit v0.11 and later adds
[provenance attestations](/manuals/build/metadata/attestations/slsa-provenance.md) to images you
build. Set `BUILDX_NO_DEFAULT_ATTESTATIONS=1` to disable the default provenance
attestations.

Usage:

```console
$ export BUILDX_NO_DEFAULT_ATTESTATIONS=1
```

### BUILDX_NO_DEFAULT_LOAD

When you build an image using the `docker` driver, the image is automatically
loaded to the image store when the build finishes. Set `BUILDX_NO_DEFAULT_LOAD`
to disable automatic loading of images to the local container store.

Usage:

```console
$ export BUILDX_NO_DEFAULT_LOAD=1
```

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