chore: refactor interface with new naming

Signed-off-by: Christopher Phillips <32073428+spiffcs@users.noreply.github.com>

syft/file/mock_resolver.go

@@ -14,6 +14,7 @@ import (
 
 var _ Resolver = (*MockResolver)(nil)
 var _ OCIMediaTypeResolver = (*MockResolver)(nil)
+var _ OCIArtifactResolver = (*MockResolver)(nil)
 
 // MockResolver implements the FileResolver interface and is intended for use *only in test code*.
 // It provides an implementation that can resolve local filesystem paths using only a provided discrete list of file
@@ -25,6 +26,7 @@ type MockResolver struct {
 	mediaTypeIndex map[string][]Location
 	extension      map[string][]Location
 	basename       map[string][]Location
+	ociRef         string
 }
 
 // NewMockResolverForPaths creates a new MockResolver, where the only resolvable
@@ -74,6 +76,16 @@ func NewMockResolverForPathsWithMetadata(metadata map[Coordinates]Metadata) *Moc
 	}
 }
 
+// NewMockResolverForOCIArtifact creates a MockResolver that can resolve files
+// by media type AND surfaces the given OCI ref via the OCIArtifactResolver
+// interface. Intended for tests that exercise the catalogers' OCI-artifact-aware
+// naming code paths.
+func NewMockResolverForOCIArtifact(ref string, mediaTypes map[string][]Location) *MockResolver {
+	r := NewMockResolverForMediaTypes(mediaTypes)
+	r.ociRef = ref
+	return r
+}
+
 // NewMockResolverForMediaTypes creates a MockResolver that can resolve files by media type.
 // The mediaTypes map specifies which locations should be returned for each media type.
 func NewMockResolverForMediaTypes(mediaTypes map[string][]Location) *MockResolver {
@@ -102,6 +114,11 @@ func NewMockResolverForMediaTypes(mediaTypes map[string][]Location) *MockResolve
 	}
 }
 
+// ImageReference returns the image reference associated with this mock, if any.
+func (r MockResolver) ImageReference() string {
+	return r.ociRef
+}
+
 // HasPath indicates if the given path exists in the underlying source.
 func (r MockResolver) HasPath(path string) bool {
 	for _, l := range r.locations {

syft/file/resolver.go

@@ -63,6 +63,17 @@ type OCIMediaTypeResolver interface {
 	FilesByMediaType(types ...string) ([]Location, error)
 }
 
+// OCIArtifactResolver exposes the user-supplied OCI image reference to
+// catalogers. Catalogers can type-assert a Resolver to this interface when they
+// need a naming or context hint that the layer contents alone don't carry — for
+// example, when a repacked AI model artifact has stripped name fields out of its
+// config.json and the only remaining identifier is the image reference itself.
+type OCIArtifactResolver interface {
+	// ImageReference returns the image reference the artifact was fetched with, e.g.
+	// "docker.io/ai/smollm2-vllm:360M". Returns "" when not known.
+	ImageReference() string
+}
+
 // LocationResolver provides iteration over all file locations in a source.
 type LocationResolver interface {
 	// AllLocations returns a channel of all file references from the underlying source.

syft/internal/fileresolver/container_image_model.go

@@ -12,6 +12,7 @@ import (
 
 var _ file.Resolver = (*ContainerImageModel)(nil)
 var _ file.OCIMediaTypeResolver = (*ContainerImageModel)(nil)
+var _ file.OCIArtifactResolver = (*ContainerImageModel)(nil)
 
 // LayerInfo holds information about an OCI model layer file stored on disk.
 type LayerInfo struct {
@@ -26,10 +27,14 @@ type ContainerImageModel struct {
 	tempDir    string                   // temp directory containing all layer files
 	layerFiles map[string]LayerInfo     // digest -> layer info (temp path + media type)
 	locations  map[string]file.Location // digest -> location
+	ref        string                   // image reference the artifact was fetched with
 }
 
-// NewContainerImageModel creates a new resolver with the given temp directory and layer files.
-func NewContainerImageModel(tempDir string, layerFiles map[string]LayerInfo) *ContainerImageModel {
+// NewContainerImageModel creates a new resolver with the given temp directory
+// and layer files. The ref is surfaced through the file.OCIArtifactResolver
+// interface so catalogers can derive context-level naming hints from the
+// artifact reference when the layer contents don't carry one.
+func NewContainerImageModel(tempDir string, layerFiles map[string]LayerInfo, ref string) *ContainerImageModel {
 	// Create locations for all layer files
 	// Each location has RealPath="/", FileSystemID=digest, AccessPath="/"
 	locations := make(map[string]file.Location, len(layerFiles))
@@ -43,9 +48,15 @@ func NewContainerImageModel(tempDir string, layerFiles map[string]LayerInfo) *Co
 		tempDir:    tempDir,
 		layerFiles: layerFiles,
 		locations:  locations,
+		ref:        ref,
 	}
 }
 
+// ImageReference returns the image reference the artifact was fetched with.
+func (r *ContainerImageModel) ImageReference() string {
+	return r.ref
+}
+
 // FilesByMediaType returns locations for layers matching the given media type patterns.
 // Patterns support glob-style matching (e.g., "application/vnd.docker.ai*").
 func (r *ContainerImageModel) FilesByMediaType(types ...string) ([]file.Location, error) {

syft/internal/fileresolver/container_image_model_test.go

@@ -60,7 +60,7 @@ func TestOCIModelResolver_FilesByMediaType(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			resolver := NewContainerImageModel(tempDir, test.layerFiles)
+			resolver := NewContainerImageModel(tempDir, test.layerFiles, "")
 
 			locations, err := resolver.FilesByMediaType(test.patterns...)
 			require.NoError(t, err)
@@ -81,7 +81,7 @@ func TestOCIModelResolver_FileContentsByLocation(t *testing.T) {
 		digest: {TempPath: tempFile, MediaType: ggufLayerMediaType},
 	}
 
-	resolver := NewContainerImageModel(tempDir, layerFiles)
+	resolver := NewContainerImageModel(tempDir, layerFiles, "")
 
 	tests := []struct {
 		name      string

syft/pkg/cataloger/ai/parse_safetensors_test.go

@@ -147,10 +147,10 @@ func TestSafeTensorsMergeProcessor(t *testing.T) {
 		}
 	}
 
-	t.Run("dir scan: parent-dir fallback names a bare safetensors with no siblings", func(t *testing.T) {
-		// case #1: model.safetensors in /models/tiny-llama/ with no config.json
-		// or README. The processor cannot derive a producer name and Architecture
-		// is empty, so it lands on the parent-dir rung.
+	t.Run("dir scan: dropped when no sibling config.json carries _name_or_path", func(t *testing.T) {
+		// Without a config.json the dir-scan path has no name source. There is
+		// intentionally no parent-dir fallback (or any opaque fallback), so the
+		// group is dropped rather than named after the filesystem layout.
 		p := dirPkg("/models/tiny-llama/weights.safetensors", pkg.SafeTensorsModelInfo{
 			Format:       "safetensors",
 			TensorCount:  4,
@@ -160,30 +160,15 @@ func TestSafeTensorsMergeProcessor(t *testing.T) {
 		resolver := file.NewMockResolverForPaths() // no config.json / README available
 		out, _, err := safeTensorsMergeProcessor(context.Background(), resolver, []pkg.Package{p}, nil, nil)
 		require.NoError(t, err)
-		require.Len(t, out, 1)
-		assert.Equal(t, "tiny-llama", out[0].Name)
+		assert.Empty(t, out, "dir-scan group with no config.json must be dropped")
 	})
 
-	t.Run("dir scan: parent-dir fallback rescues a metadata-only header", func(t *testing.T) {
-		// case #3: header carries only __metadata__, no tensors. Parameters and
-		// Architecture are both empty, so Arch-Parameters can't fire either —
-		// the parent-dir fallback is the only thing that names the package.
-		p := dirPkg("/scan/edge/headeronly/model.safetensors", pkg.SafeTensorsModelInfo{
-			Format:       "safetensors",
-			MetadataHash: "xyz",
-			UserMetadata: pkg.KeyValues{{Key: "producer", Value: "stgen"}},
-		})
-		resolver := file.NewMockResolverForPaths()
-		out, _, err := safeTensorsMergeProcessor(context.Background(), resolver, []pkg.Package{p}, nil, nil)
-		require.NoError(t, err)
-		require.Len(t, out, 1)
-		assert.Equal(t, "headeronly", out[0].Name)
-	})
-
-	t.Run("dir scan: Architecture-Parameters synthetic wins over parent-dir", func(t *testing.T) {
-		// Architecture and Parameters are both populated → synthetic wins over
-		// the parent-dir fallback. _name_or_path is not available (no sibling
-		// config.json mock).
+	t.Run("dir scan: Architecture-Parameters alone does not name the package", func(t *testing.T) {
+		// Even with rich content-derived metadata (Architecture + Parameters),
+		// the package must be dropped when there is no producer-declared name.
+		// The Arch-Params synthetic rung was removed because it produced labels
+		// like "LlamaForCausalLM-2.68B" that SBOM consumers couldn't trace back
+		// to a recognizable model.
 		p := dirPkg("/models/tiny/weights.safetensors", pkg.SafeTensorsModelInfo{
 			Format:       "safetensors",
 			Architecture: "LlamaForCausalLM",
@@ -194,15 +179,14 @@ func TestSafeTensorsMergeProcessor(t *testing.T) {
 		resolver := file.NewMockResolverForPaths()
 		out, _, err := safeTensorsMergeProcessor(context.Background(), resolver, []pkg.Package{p}, nil, nil)
 		require.NoError(t, err)
-		require.Len(t, out, 1)
-		assert.Equal(t, "LlamaForCausalLM-2.68B", out[0].Name)
+		assert.Empty(t, out, "Arch-Params alone is not a name source")
 	})
 
 	t.Run("OCI: dropped when no name source is available", func(t *testing.T) {
 		// The vllm-style shape: config-blob package + a weight-layer package,
-		// both at virtual path "/", no model.file companions on the resolver.
-		// With nothing to derive a name from, the group is dropped (no opaque
-		// fallback / no parent-dir option for OCI).
+		// both at virtual path "/", no model.file companions on the resolver
+		// AND no image ref. With nothing to derive a name from, the group is
+		// dropped — no opaque fallback.
 		configMd := pkg.SafeTensorsModelInfo{
 			Format:      "safetensors",
 			TensorCount: 5,
@@ -223,6 +207,57 @@ func TestSafeTensorsMergeProcessor(t *testing.T) {
 		assert.Empty(t, out, "OCI group with no naming source must be dropped")
 	})
 
+	t.Run("OCI: image-ref last segment names the group when config.json is absent", func(t *testing.T) {
+		// vllm-style artifact: a repacked model whose embedded config.json has
+		// been stripped of _name_or_path. The merge processor falls through to
+		// the second rung — the image-reference last segment — so we still emit
+		// a recognizable model name instead of dropping it.
+		configMd := pkg.SafeTensorsModelInfo{
+			Format:      "safetensors",
+			TensorCount: 290,
+			TotalSize:   "723MB",
+		}
+		shardMd := pkg.SafeTensorsModelInfo{
+			Format:       "safetensors",
+			TensorCount:  290,
+			Quantization: "BF16",
+			MetadataHash: "deadbeef",
+		}
+		resolver := file.NewMockResolverForOCIArtifact(
+			"docker.io/ai/smollm2-vllm:360M", nil,
+		)
+		out, _, err := safeTensorsMergeProcessor(
+			context.Background(), resolver,
+			[]pkg.Package{ociPkg(configMd), ociPkg(shardMd)}, nil, nil,
+		)
+		require.NoError(t, err)
+		require.Len(t, out, 1)
+		assert.Equal(t, "smollm2-vllm", out[0].Name, "rung 2: image-ref repository basename")
+	})
+
+	t.Run("OCI: config.json _name_or_path beats the image-ref fallback", func(t *testing.T) {
+		// When the embedded config.json carries _name_or_path, rung 1 wins over
+		// the image ref even if both are present.
+		dir := t.TempDir()
+		hfConfigPath := filepath.Join(dir, "config.json")
+		require.NoError(t, os.WriteFile(hfConfigPath,
+			[]byte(`{"_name_or_path":"org/preferred-name"}`), 0o644))
+		resolver := file.NewMockResolverForOCIArtifact(
+			"docker.io/ai/smollm2-vllm:360M",
+			map[string][]file.Location{
+				dockerAIModelFileMediaType: {file.NewLocation(hfConfigPath)},
+			},
+		)
+		configMd := pkg.SafeTensorsModelInfo{Format: "safetensors", TensorCount: 1}
+		out, _, err := safeTensorsMergeProcessor(
+			context.Background(), resolver,
+			[]pkg.Package{ociPkg(configMd)}, nil, nil,
+		)
+		require.NoError(t, err)
+		require.Len(t, out, 1)
+		assert.Equal(t, "preferred-name", out[0].Name, "rung 1 (config.json) wins over rung 2 (image ref)")
+	})
+
 	t.Run("OCI: merges config + shard and names from companion config.json", func(t *testing.T) {
 		// Write a single model.file companion blob containing HF config.json so
 		// the processor can derive _name_or_path and Architecture from it.
@@ -348,118 +383,56 @@ spdx-id: Apache-2.0
 	})
 }
 
-// TestSafeTensorsNamingPrecedence codifies pickSafeTensorsName's documented
-// precedence chain. Each case sets exactly the inputs that should activate one
-// rung and asserts the expected outcome — including the drop case when every
-// rung is unavailable.
+// TestSafeTensorsNamingPrecedence codifies pickSafeTensorsName's two-rung
+// precedence chain. Each case sets the inputs that should activate one rung
+// (or neither, asserting the drop path).
 //
 // Precedence (highest → lowest):
-//  1. config.json _name_or_path  (path.Base applied)
-//  2. OCI manifest title         (follow-up; covered today by an empty-string input)
-//  3. Architecture + Parameters  (both must be non-empty)
-//  4. parent directory           (dir-scan only; OCI groups skip this rung)
+//  1. config.json _name_or_path  (path.Base applied; both dir-scan and OCI)
+//  2. OCI image-ref last segment (OCI only — empty string for dir scans)
 //     → drop (empty name) when nothing matches
 func TestSafeTensorsNamingPrecedence(t *testing.T) {
-	const dirGroup = "/scan/parent-name"
-
 	cases := []struct {
 		name         string
-		groupKey   string
 		nameOrPath   string
-		arch       string
-		params     string
+		imageRefName string
 		want         string
 	}{
 		// rung 1
 		{
-			name:       "rung 1: _name_or_path beats Arch+Params and parent-dir",
-			groupKey:   dirGroup,
+			name:         "rung 1: _name_or_path beats the image-ref fallback",
 			nameOrPath:   "org/MyModel",
-			arch:       "LlamaForCausalLM",
-			params:     "7B",
+			imageRefName: "fallback-ref",
 			want:         "MyModel",
 		},
 		{
 			name:       "rung 1: applies path.Base to the raw value",
-			groupKey:   dirGroup,
 			nameOrPath: "very/deep/checkpoint/path/leaf-model",
 			want:       "leaf-model",
 		},
 		{
-			name:       "rung 1: works for OCI groups too",
-			groupKey:   ociGroupKey,
-			nameOrPath: "org/OciModel",
+			name:       "rung 1: bare name without slashes is preserved",
+			nameOrPath: "OciModel",
 			want:       "OciModel",
 		},
 
-		// rung 3
+		// rung 2
 		{
-			name:     "rung 3: Arch+Params wins when no _name_or_path",
-			groupKey: dirGroup,
-			arch:     "LlamaForCausalLM",
-			params:   "7B",
-			want:     "LlamaForCausalLM-7B",
-		},
-		{
-			name:     "rung 3: works for OCI groups (the only non-drop rung when no manifest title)",
-			groupKey: ociGroupKey,
-			arch:     "Qwen3ForCausalLM",
-			params:   "2.66B",
-			want:     "Qwen3ForCausalLM-2.66B",
-		},
-		{
-			name:     "rung 3 NOT taken when only Architecture is set: falls through to parent-dir",
-			groupKey: dirGroup,
-			arch:     "LlamaForCausalLM",
-			want:     "parent-name",
-		},
-		{
-			name:     "rung 3 NOT taken when only Parameters is set: falls through to parent-dir",
-			groupKey: dirGroup,
-			params:   "7B",
-			want:     "parent-name",
-		},
-
-		// rung 4
-		{
-			name:     "rung 4: parent-dir when no other rung populated",
-			groupKey: dirGroup,
-			want:     "parent-name",
-		},
-		{
-			name:     "rung 4 skipped for OCI groups: no usable parent path",
-			groupKey: ociGroupKey,
-			want:     "",
+			name:         "rung 2: image-ref last segment used when _name_or_path is empty",
+			imageRefName: "smollm2-vllm",
+			want:         "smollm2-vllm",
 		},
 
 		// drops
 		{
-			name:     "drop: dir group at filesystem root",
-			groupKey: "/",
-			want:     "",
-		},
-		{
-			name:     "drop: dir group with empty parent",
-			groupKey: ".",
-			want:     "",
-		},
-		{
-			name:     "drop: OCI group with nothing",
-			groupKey: ociGroupKey,
+			name: "drop: both rungs empty",
 			want: "",
 		},
 	}
 
 	for _, tc := range cases {
 		t.Run(tc.name, func(t *testing.T) {
-			merged := pkg.Package{
-				Type: pkg.ModelPkg,
-				Metadata: pkg.SafeTensorsModelInfo{
-					Architecture: tc.arch,
-					Parameters:   tc.params,
-				},
-			}
-			got := pickSafeTensorsName(merged, tc.groupKey, tc.nameOrPath)
+			got := pickSafeTensorsName(tc.nameOrPath, tc.imageRefName)
 			assert.Equal(t, tc.want, got)
 		})
 	}

syft/pkg/cataloger/ai/processor.go

@@ -11,6 +11,7 @@ import (
 	"strings"
 
 	"github.com/cespare/xxhash/v2"
+	gcrname "github.com/google/go-containerregistry/pkg/name"
 	"gopkg.in/yaml.v3"
 
 	"github.com/anchore/syft/internal"
@@ -87,10 +88,13 @@ func ggufMergeProcessor(pkgs []pkg.Package, rels []artifact.Relationship, err er
 //     sibling config.json + README.md for dir scans, the model-file companion
 //     layers + license layer for OCI — and attaches those locations as
 //     supporting evidence;
-//  4. picks a name via the precedence chain
-//     config.json _name_or_path → Architecture-Parameters → parent-dir
-//     and drops the group when none of those produced a name (no opaque
-//     fallback / no MetadataHash-as-name).
+//  4. picks a name via a two-rung precedence chain (see pickSafeTensorsName):
+//     config.json _name_or_path first (both sources), then the OCI image-ref
+//     last segment (OCI only). Drops the group when neither rung produces a
+//     name. There is no opaque fallback (no Architecture-Parameters synthetic,
+//     no parent-dir, no MetadataHash-as-name) — an unnameable model is
+//     intentionally absent from the SBOM rather than recorded under a
+//     misleading label.
 func safeTensorsMergeProcessor(ctx context.Context, resolver file.Resolver, pkgs []pkg.Package, rels []artifact.Relationship, err error) ([]pkg.Package, []artifact.Relationship, error) {
 	if err != nil || len(pkgs) == 0 {
 		return pkgs, rels, err
@@ -123,8 +127,8 @@ func safeTensorsMergeProcessor(ctx context.Context, resolver file.Resolver, pkgs
 	out := other
 	for _, key := range keys {
 		merged := mergeSafeTensorsGroup(groups[key])
-		nameOrPath := enrichSafeTensorsGroup(ctx, resolver, key, &merged)
-		name := pickSafeTensorsName(merged, key, nameOrPath)
+		nameOrPath, imageRefName := enrichSafeTensorsGroup(ctx, resolver, key, &merged)
+		name := pickSafeTensorsName(nameOrPath, imageRefName)
 		if name == "" {
 			continue // drop unnameable groups, per design (no opaque fallback)
 		}
@@ -331,9 +335,11 @@ func rollupHash(hashes []string) string {
 // enrichSafeTensorsGroup reads the resolver once for the group to populate the
 // merged metadata's Architecture / TorchDtype / TransformersVersion, set the
 // licenses on the merged package, and attach the location of every consulted
-// supporting file as SupportingEvidence. Returns the raw _name_or_path so the
-// caller can apply path.Base in its naming step.
-func enrichSafeTensorsGroup(ctx context.Context, resolver file.Resolver, groupKey string, merged *pkg.Package) (nameOrPath string) {
+// supporting file as SupportingEvidence. Returns two name candidates for the
+// merge processor: nameOrPath (raw _name_or_path from a config.json) and
+// imageRefName (the last path segment of the OCI image reference, empty for
+// dir-scan groups).
+func enrichSafeTensorsGroup(ctx context.Context, resolver file.Resolver, groupKey string, merged *pkg.Package) (nameOrPath, imageRefName string) {
 	md := merged.Metadata.(pkg.SafeTensorsModelInfo)
 
 	var (
@@ -341,7 +347,7 @@ func enrichSafeTensorsGroup(ctx context.Context, resolver file.Resolver, groupKe
 		supporting []file.Location
 	)
 	if groupKey == ociGroupKey {
-		nameOrPath, lics, supporting = enrichSafeTensorsOCI(ctx, resolver, &md)
+		nameOrPath, imageRefName, lics, supporting = enrichSafeTensorsOCI(ctx, resolver, &md)
 	} else {
 		nameOrPath, lics, supporting = enrichSafeTensorsDir(ctx, resolver, groupKey, &md)
 	}
@@ -353,7 +359,7 @@ func enrichSafeTensorsGroup(ctx context.Context, resolver file.Resolver, groupKe
 	for _, loc := range supporting {
 		merged.Locations.Add(loc.WithAnnotation(pkg.EvidenceAnnotationKey, pkg.SupportingEvidenceAnnotation))
 	}
-	return nameOrPath
+	return nameOrPath, imageRefName
 }
 
 // enrichSafeTensorsDir handles the directory-scan case: look for sibling
@@ -380,11 +386,16 @@ func enrichSafeTensorsDir(ctx context.Context, resolver file.Resolver, dir strin
 // enrichSafeTensorsOCI handles the OCI-artifact case: walk the
 // vnd.docker.ai.model.file layers (READMEs and HF config.json all ride that
 // media type — we sniff content to tell them apart), then fall back to the
-// vnd.docker.ai.license layer through the shared license scanner.
-func enrichSafeTensorsOCI(ctx context.Context, resolver file.Resolver, md *pkg.SafeTensorsModelInfo) (nameOrPath string, lics []pkg.License, supporting []file.Location) {
+// vnd.docker.ai.license layer through the shared license scanner. It also
+// pulls the user-supplied image reference off the resolver (when the resolver
+// implements file.OCIArtifactResolver) and returns its last path segment as a
+// naming candidate — repacked artifacts like Docker AI vllm images frequently
+// strip name fields out of every embedded config, so the image ref is often
+// the only remaining identifier for the model.
+func enrichSafeTensorsOCI(ctx context.Context, resolver file.Resolver, md *pkg.SafeTensorsModelInfo) (nameOrPath, imageRefName string, lics []pkg.License, supporting []file.Location) {
 	ociResolver, ok := resolver.(file.OCIMediaTypeResolver)
 	if !ok {
-		return "", nil, nil
+		return "", "", nil, nil
 	}
 
 	modelFileLocs, err := ociResolver.FilesByMediaType(dockerAIModelFileMediaType)
@@ -424,7 +435,30 @@ func enrichSafeTensorsOCI(ctx context.Context, resolver file.Resolver, md *pkg.S
 			supporting = append(supporting, licLocs...)
 		}
 	}
-	return nameOrPath, lics, supporting
+
+	imageRefName = ociImageRefBasename(resolver)
+	return nameOrPath, imageRefName, lics, supporting
+}
+
+// ociImageRefBasename returns the last path segment of the repository portion
+// of the OCI image reference exposed by the resolver, or "" when the resolver
+// does not implement OCIArtifactResolver or the reference fails to parse. For
+// "docker.io/ai/smollm2-vllm:360M" this returns "smollm2-vllm".
+func ociImageRefBasename(resolver file.Resolver) string {
+	info, ok := resolver.(file.OCIArtifactResolver)
+	if !ok {
+		return ""
+	}
+	ref := info.ImageReference()
+	if ref == "" {
+		return ""
+	}
+	parsed, err := gcrname.ParseReference(ref)
+	if err != nil {
+		log.Debugf("failed to parse OCI ref %q: %v", ref, err)
+		return ""
+	}
+	return path.Base(parsed.Context().RepositoryStr())
 }
 
 // identifyLicenseLayers turns Docker AI license-layer locations into
@@ -530,32 +564,21 @@ func applyHFConfig(md *pkg.SafeTensorsModelInfo, cfg *hfConfig) {
 
 // pickSafeTensorsName implements the documented naming precedence chain:
 //
-//  1. config.json _name_or_path             (path.Base, so "org/Model" → "Model")
-//  2. OCI manifest title                    (deferred to a follow-up; reserved here)
-//  3. Architecture-Parameters synthetic     (only when both are populated)
-//  4. parent directory of the group         (dir-scan only — OCI has no useful path)
+//  1. config.json _name_or_path  (path.Base, so "org/Model" → "Model";
+//     applies to both dir-scan and OCI groups)
+//  2. OCI image-ref last segment (OCI-only; the user-supplied artifact
+//     reference's repository basename, e.g.
+//     "docker.io/ai/smollm2-vllm:360M" → "smollm2-vllm")
 //
-// Returns "" to signal the merge processor should drop the group rather than
-// invent a name.
-func pickSafeTensorsName(merged pkg.Package, groupKey, nameOrPath string) string {
-	md, _ := merged.Metadata.(pkg.SafeTensorsModelInfo)
-
+// Returns "" to signal the merge processor should drop the group. There is
+// intentionally no Architecture-Parameters synthetic or parent-directory
+// fallback: an unnameable model is recorded as absent rather than under a
+// label the SBOM consumer would not recognize.
+func pickSafeTensorsName(nameOrPath, imageRefName string) string {
 	if nameOrPath != "" {
 		return path.Base(nameOrPath)
 	}
-	// 2. OCI manifest title — follow-up.
-
-	if md.Architecture != "" && md.Parameters != "" {
-		return md.Architecture + "-" + md.Parameters
-	}
-
-	if groupKey != ociGroupKey {
-		base := path.Base(groupKey)
-		if base != "" && base != "." && base != "/" {
-			return base
-		}
-	}
-	return ""
+	return imageRefName
 }
 
 // --- Relocated enrichment helpers ----------------------------------------
@@ -632,11 +655,11 @@ func extractFrontmatterBlock(buf []byte) []byte {
 	if i := bytes.IndexByte(rest, '\n'); i >= 0 {
 		rest = rest[i+1:]
 	}
-	end := bytes.Index(rest, []byte("\n---"))
-	if end < 0 {
+	block, _, found := bytes.Cut(rest, []byte("\n---"))
+	if !found {
 		return nil
 	}
-	return rest[:end]
+	return block
 }
 
 // parseFrontmatter decodes a Hugging Face model card YAML frontmatter block

syft/pkg/cataloger/ai/test_helpers_test.go

@@ -52,11 +52,6 @@ func (b *testGGUFBuilder) withVersion(v uint32) *testGGUFBuilder {
 	return b
 }
 
-func (b *testGGUFBuilder) withTensorCount(count uint64) *testGGUFBuilder {
-	b.tensorCount = count
-	return b
-}
-
 func (b *testGGUFBuilder) withStringKV(key, value string) *testGGUFBuilder {
 	b.kvPairs = append(b.kvPairs, testKVPair{key: key, valueType: ggufTypeString, value: value})
 	return b
@@ -119,10 +114,3 @@ func (b *testGGUFBuilder) build() []byte {
 
 	return b.buf.Bytes()
 }
-
-// buildInvalidMagic creates a file with invalid magic number
-func (b *testGGUFBuilder) buildInvalidMagic() []byte {
-	buf := new(bytes.Buffer)
-	binary.Write(buf, binary.LittleEndian, uint32(0x12345678))
-	return buf.Bytes()
-}

syft/source/ocimodelsource/oci_model_source.go

@@ -39,6 +39,7 @@ type ociModelSource struct {
 	resolver  interface {
 		file.Resolver
 		file.OCIMediaTypeResolver
+		file.OCIArtifactResolver
 	}
 	mutex *sync.Mutex
 }
@@ -158,7 +159,11 @@ func fetchAndStoreModelHeaders(ctx context.Context, client *registryClient, arti
 		}
 	}
 
-	resolver := fileresolver.NewContainerImageModel(tempDir, layerFiles)
+	resolver := fileresolver.NewContainerImageModel(
+		tempDir,
+		layerFiles,
+		artifact.Reference.String(),
+	)
 
 	return tempDir, resolver, nil
 }