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Merge pull request #26479 from crazy-max/docs/buildx-3415-git-query-compatibility

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build: explain Git query compatibility resolution
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CrazyMax authored and GitHub committed 2026-10-29 12:56:08 +01:00
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commit a2cc501182
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content/manuals/build/building/variables.md
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@@ -331,6 +331,7 @@ They're used to configure the Buildx client, or the BuildKit daemon.
| [BUILDX_NO_DEFAULT_ATTESTATIONS](#buildx_no_default_attestations) | Boolean | Turn off default provenance attestations. |
| [BUILDX_NO_DEFAULT_OCI_ARTIFACT](#buildx_no_default_oci_artifact) | Boolean | Turn off OCI artifact storage for attestations by default. |
| [BUILDX_NO_DEFAULT_LOAD](#buildx_no_default_load) | Boolean | Turn off loading images to image store by default. |
| [BUILDX_SEND_GIT_QUERY_AS_INPUT](#buildx_send_git_query_as_input) | Boolean | Resolve Git URL queries in Buildx for frontend compatibility. |
| [EXPERIMENTAL_BUILDKIT_SOURCE_POLICY](#experimental_buildkit_source_policy) | String | Specify a BuildKit source policy file. |
BuildKit also supports a few additional configuration parameters. Refer to
@@ -808,4 +809,26 @@ Usage:
$ export BUILDX_NO_DEFAULT_LOAD=1
```
### BUILDX_SEND_GIT_QUERY_AS_INPUT
Set `BUILDX_SEND_GIT_QUERY_AS_INPUT=1` to use Git URL queries with a BuildKit
daemon or Dockerfile frontend that doesn't support the Git query-string
format. Buildx resolves the Git URL into a source input instead of requiring
the frontend to interpret the query. The default is `false`.
For example, select a tag and verify its commit while using an older builder:
```console
$ BUILDX_SEND_GIT_QUERY_AS_INPUT=1 docker buildx build \
'https://github.com/moby/buildkit.git?tag=v0.21.1&checksum=66735c67'
```
This applies to the main Git context and additional Git contexts that use
URL queries. It changes how the context is represented in provenance:
the context is supplied as a source input instead of the usual context
string. If you consume provenance, account for that difference before
enabling the setting in your workflow.
See [Git URL queries](../concepts/context.md#url-queries) for query syntax.
<!-- vale Docker.HeadingSentenceCase = YES -->
content/manuals/build/concepts/context.md
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@@ -289,6 +289,11 @@ $ docker buildx build 'https://github.com/user/myrepo.git?tag=v0.1.0&commit=dead
> Short commit hash is supported with `checksum` (alias `commit`) query but for
> `ref`, only the full hash of the commit is supported.
If your BuildKit daemon or Dockerfile frontend doesn't support URL queries,
set `BUILDX_SEND_GIT_QUERY_AS_INPUT=1` to let Buildx resolve them. This changes
the context's provenance representation; see the
[compatibility setting](../building/variables.md#buildx_send_git_query_as_input).
#### Keep `.git` directory
By default, BuildKit doesn't keep the `.git` directory when using Git contexts.