Added way to configure SBOM scanner

Signed-off-by: Laurent Goderre <[email protected]>

control/control.go

@@ -460,15 +460,22 @@ func (c *Controller) Solve(ctx context.Context, req *controlapi.SolveRequest) (*
 	var procs []llbsolver.Processor
 
 	if attrs, ok := attests["sbom"]; ok {
-		src := attrs["generator"]
-		if src == "" {
-			return nil, errors.Errorf("sbom generator cannot be empty")
-		}
-		ref, err := reference.ParseNormalizedNamed(src)
-		if err != nil {
-			return nil, errors.Wrapf(err, "failed to parse sbom generator %s", src)
+		var ref reference.Named
+		params := make(map[string]string)
+		for k, v := range attrs {
+			if k == "generator" {
+				if v == "" {
+					return nil, errors.Errorf("sbom generator cannot be empty")
+				}
+				ref, err = reference.ParseNormalizedNamed(v)
+				if err != nil {
+					return nil, errors.Wrapf(err, "failed to parse sbom generator %s", v)
+				}
+				ref = reference.TagNameOnly(ref)
+			} else {
+				params[k] = v
+			}
 		}
-		ref = reference.TagNameOnly(ref)
 
 		useCache := true
 		if v, ok := req.FrontendAttrs["no-cache"]; ok && v == "" {
@@ -480,7 +487,7 @@ func (c *Controller) Solve(ctx context.Context, req *controlapi.SolveRequest) (*
 			resolveMode = v
 		}
 
-		procs = append(procs, proc.SBOMProcessor(ref.String(), useCache, resolveMode))
+		procs = append(procs, proc.SBOMProcessor(ref.String(), useCache, resolveMode, params))
 	}
 
 	if attrs, ok := attests["provenance"]; ok {

frontend/attestations/parse_test.go

@@ -0,0 +1,66 @@
+package attestations
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestParse(t *testing.T) {
+	for _, tc := range []struct {
+		name     string
+		values   map[string]string
+		expected map[string]map[string]string
+	}{
+		{
+			name: "simple",
+			values: map[string]string{
+				"attest:sbom":       "generator=docker.io/foo/bar",
+				"attest:provenance": "mode=max",
+			},
+			expected: map[string]map[string]string{
+				"sbom": {
+					"generator": "docker.io/foo/bar",
+				},
+				"provenance": {
+					"mode": "max",
+				},
+			},
+		},
+		{
+			name: "extra params",
+			values: map[string]string{
+				"attest:sbom": "generator=docker.io/foo/bar,param1=foo,param2=bar",
+			},
+			expected: map[string]map[string]string{
+				"sbom": {
+					"generator": "docker.io/foo/bar",
+					"param1":    "foo",
+					"param2":    "bar",
+				},
+			},
+		},
+		{
+			name: "extra params (complex)",
+			values: map[string]string{
+				"attest:sbom": "\"generator=docker.io/foo/bar\",\"param1=foo\",\"param2=bar\",\"param3=abc,def\"",
+			},
+			expected: map[string]map[string]string{
+				"sbom": {
+					"generator": "docker.io/foo/bar",
+					"param1":    "foo",
+					"param2":    "bar",
+					"param3":    "abc,def",
+				},
+			},
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			attests, err := Parse(tc.values)
+			require.NoError(t, err)
+			_ = attests
+			assert.Equal(t, tc.expected, attests)
+		})
+	}
+}

frontend/attestations/sbom/sbom.go

@@ -34,7 +34,7 @@ const (
 // attestation.
 type Scanner func(ctx context.Context, name string, ref llb.State, extras map[string]llb.State, opts ...llb.ConstraintsOpt) (result.Attestation[*llb.State], error)
 
-func CreateSBOMScanner(ctx context.Context, resolver sourceresolver.MetaResolver, scanner string, resolveOpt sourceresolver.Opt) (Scanner, error) {
+func CreateSBOMScanner(ctx context.Context, resolver sourceresolver.MetaResolver, scanner string, resolveOpt sourceresolver.Opt, params map[string]string) (Scanner, error) {
 	if scanner == "" {
 		return nil, nil
 	}
@@ -66,6 +66,10 @@ func CreateSBOMScanner(ctx context.Context, resolver sourceresolver.MetaResolver
 			env = append(env, "BUILDKIT_SCAN_SOURCE_EXTRAS="+path.Join(srcDir, "extras/"))
 		}
 
+		for k, v := range params {
+			env = append(env, "BUILDKIT_SCAN_"+k+"="+v)
+		}
+
 		runOpts := []llb.RunOption{
 			llb.WithCustomName(fmt.Sprintf("[%s] generating sbom using %s", name, scanner)),
 		}

frontend/dockerfile/builder/build.go

@@ -118,7 +118,7 @@ func Build(ctx context.Context, c client.Client) (_ *client.Result, err error) {
 			ImageOpt: &sourceresolver.ResolveImageOpt{
 				ResolveMode: opts["image-resolve-mode"],
 			},
-		})
+		}, bc.SBOM.Parameters)
 		if err != nil {
 			return nil, err
 		}

frontend/dockerui/config.go

@@ -89,7 +89,8 @@ type Client struct {
 }
 
 type SBOM struct {
-	Generator string
+	Generator  string
+	Parameters map[string]string
 }
 
 type Source struct {
@@ -257,17 +258,26 @@ func (bc *Client) init() error {
 		return err
 	}
 	if attrs, ok := attests[attestations.KeyTypeSbom]; ok {
-		src, ok := attrs["generator"]
-		if !ok {
-			return errors.Errorf("sbom scanner cannot be empty")
+		params := make(map[string]string)
+		var ref reference.Named
+		for k, v := range attrs {
+			if k == "generator" {
+				ref, err = reference.ParseNormalizedNamed(v)
+				if err != nil {
+					return errors.Wrapf(err, "failed to parse sbom scanner %s", v)
+				}
+				ref = reference.TagNameOnly(ref)
+			} else {
+				params[k] = v
+			}
 		}
-		ref, err := reference.ParseNormalizedNamed(src)
-		if err != nil {
-			return errors.Wrapf(err, "failed to parse sbom scanner %s", src)
+		if ref == nil {
+			return errors.Errorf("sbom scanner cannot be empty")
 		}
-		ref = reference.TagNameOnly(ref)
+
 		bc.SBOM = &SBOM{
-			Generator: ref.String(),
+			Generator:  ref.String(),
+			Parameters: params,
 		}
 	}
 

solver/llbsolver/proc/sbom.go

@@ -16,7 +16,7 @@ import (
 	"github.com/pkg/errors"
 )
 
-func SBOMProcessor(scannerRef string, useCache bool, resolveMode string) llbsolver.Processor {
+func SBOMProcessor(scannerRef string, useCache bool, resolveMode string, params map[string]string) llbsolver.Processor {
 	return func(ctx context.Context, res *llbsolver.Result, s *llbsolver.Solver, j *solver.Job, usage *resources.SysSampler) (*llbsolver.Result, error) {
 		// skip sbom generation if we already have an sbom
 		if sbom.HasSBOM(res.Result) {
@@ -35,7 +35,7 @@ func SBOMProcessor(scannerRef string, useCache bool, resolveMode string) llbsolv
 			ImageOpt: &sourceresolver.ResolveImageOpt{
 				ResolveMode: resolveMode,
 			},
-		})
+		}, params)
 		if err != nil {
 			return nil, err
 		}