build: remove buildinfo

BuildKit v0.11 has deprecated buildinfo, and BuildKit v0.12 will remove
it, so we should remove it from Buildx as well.

Signed-off-by: Justin Chadwell <me@jedevc.com>

build/build.go

@@ -555,12 +555,6 @@ func toSolveOpt(ctx context.Context, node builder.Node, multiDriver bool, opt Op
 				}
 			}
 		}
-		if e.Type == "docker" || e.Type == "image" || e.Type == "oci" {
-			// inline buildinfo attrs from build arg
-			if v, ok := opt.BuildArgs["BUILDKIT_INLINE_BUILDINFO_ATTRS"]; ok {
-				e.Attrs["buildinfo-attrs"] = v
-			}
-		}
 	}
 
 	so.Exports = opt.Exports
@@ -1487,9 +1481,6 @@ func waitContextDeps(ctx context.Context, index int, results *waitmap.Map, so *c
 				if dt, ok := rr.Metadata[exptypes.ExporterImageConfigKey+"/"+platform]; ok {
 					metadata[exptypes.ExporterImageConfigKey] = dt
 				}
-				if dt, ok := rr.Metadata[exptypes.ExporterBuildInfo+"/"+platform]; ok {
-					metadata[exptypes.ExporterBuildInfo] = dt
-				}
 				if len(metadata) > 0 {
 					dt, err := json.Marshal(metadata)
 					if err != nil {
@@ -1511,9 +1502,6 @@ func waitContextDeps(ctx context.Context, index int, results *waitmap.Map, so *c
 			if dt, ok := rr.Metadata[exptypes.ExporterImageConfigKey]; ok {
 				metadata[exptypes.ExporterImageConfigKey] = dt
 			}
-			if dt, ok := rr.Metadata[exptypes.ExporterBuildInfo]; ok {
-				metadata[exptypes.ExporterBuildInfo] = dt
-			}
 			if len(metadata) > 0 {
 				dt, err := json.Marshal(metadata)
 				if err != nil {

docs/reference/buildx_build.md

@@ -125,7 +125,6 @@ Same as [`docker build` command](https://docs.docker.com/engine/reference/comman
 There are also useful built-in build args like:
 
 * `BUILDKIT_CONTEXT_KEEP_GIT_DIR=<bool>` trigger git context to keep the `.git` directory
-* `BUILDKIT_INLINE_BUILDINFO_ATTRS=<bool>` inline build info attributes in image config or not
 * `BUILDKIT_INLINE_CACHE=<bool>` inline cache metadata to image config or not
 * `BUILDKIT_MULTI_PLATFORM=<bool>` opt into deterministic output regardless of multi-platform output or not
 
@@ -286,26 +285,6 @@ $ cat metadata.json
 ```
 ```json
 {
-  "containerimage.buildinfo": {
-    "frontend": "dockerfile.v0",
-    "attrs": {
-      "context": "https://github.com/crazy-max/buildkit-buildsources-test.git#master",
-      "filename": "Dockerfile",
-      "source": "docker/dockerfile:master"
-    },
-    "sources": [
-      {
-        "type": "docker-image",
-        "ref": "docker.io/docker/buildx-bin:0.6.1@sha256:a652ced4a4141977c7daaed0a074dcd9844a78d7d2615465b12f433ae6dd29f0",
-        "pin": "sha256:a652ced4a4141977c7daaed0a074dcd9844a78d7d2615465b12f433ae6dd29f0"
-      },
-      {
-        "type": "docker-image",
-        "ref": "docker.io/library/alpine:3.13",
-        "pin": "sha256:026f721af4cf2843e07bba648e158fb35ecc876d822130633cc49f707f0fc88c"
-      }
-    ]
-  },
   "containerimage.config.digest": "sha256:2937f66a9722f7f4a2df583de2f8cb97fc9196059a410e7f00072fc918930e66",
   "containerimage.descriptor": {
     "annotations": {