anchore · kzantow · Mar 11, 2022 · Feb 17, 2022 · Feb 17, 2022 · Feb 17, 2022
diff --git a/cmd/format_aliases.go b/cmd/format_aliases.go
@@ -22,6 +22,8 @@ func formatAliases(ids ...sbom.FormatID) (aliases []string) {
 			aliases = append(aliases, "cyclonedx-xml")
 		case syft.CycloneDxJSONFormatID:
 			aliases = append(aliases, "cyclonedx-json")
+		case syft.GitHubID:
+			aliases = append(aliases, "github", "github-json")
 		default:
 			aliases = append(aliases, string(id))
 		}

diff --git a/internal/formats/github/encoder.go b/internal/formats/github/encoder.go
@@ -0,0 +1,183 @@
+package github
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/mholt/archiver/v3"
+
+	"github.com/anchore/packageurl-go"
+	"github.com/anchore/syft/internal"
+	"github.com/anchore/syft/internal/log"
+	"github.com/anchore/syft/internal/version"
+	"github.com/anchore/syft/syft/pkg"
+	"github.com/anchore/syft/syft/sbom"
+	"github.com/anchore/syft/syft/source"
+)
+
+// toGithubModel converts the provided SBOM to a GitHub dependency model
+func toGithubModel(s *sbom.SBOM) DependencySnapshot {
+	scanTime := time.Now().Format(time.RFC3339) // TODO is there a record of this somewhere?
+	v := version.FromBuild().Version
+	if v == "[not provided]" {
+		v = "0.0.0-dev"
+	}
+	return DependencySnapshot{
+		Version: 0,
+		// TODO allow property input to specify the Job, Sha, and Ref
+		Detector: DetectorMetadata{
+			Name:    internal.ApplicationName,
+			URL:     "https://github.com/anchore/syft",
+			Version: v,
+		},
+		Metadata:  toSnapshotMetadata(s),
+		Manifests: toGithubManifests(s),
+		Scanned:   scanTime,
+	}
+}
+
+// toSnapshotMetadata captures the linux distribution information and other metadata
+func toSnapshotMetadata(s *sbom.SBOM) Metadata {
+	out := Metadata{}
+
+	if s.Artifacts.LinuxDistribution != nil {
+		d := s.Artifacts.LinuxDistribution
+		qualifiers := packageurl.Qualifiers{}
+		if len(d.IDLike) > 0 {
+			qualifiers = append(qualifiers, packageurl.Qualifier{
+				Key:   "like",
+				Value: strings.Join(d.IDLike, ","),
+			})
+		}
+		purl := packageurl.NewPackageURL("generic", "", d.ID, d.VersionID, qualifiers, "")
+		out["syft:distro"] = purl.ToString()
+	}
+
+	return out
+}
+
+func filesystem(p pkg.Package) string {
+	if len(p.Locations) > 0 {
+		return p.Locations[0].FileSystemID
+	}
+	return ""
+}
+
+// isArchive returns true if the path appears to be an archive
+func isArchive(path string) bool {
+	_, err := archiver.ByExtension(path)
+	return err == nil
+}
+
+// toPath Generates a string representation of the package location, optionally including the layer hash
+func toPath(s source.Metadata, p pkg.Package) string {
+	inputPath := strings.TrimPrefix(s.Path, "./")
+	if inputPath == "." {
+		inputPath = ""
+	}
+	if len(p.Locations) > 0 {
+		location := p.Locations[0]
+		packagePath := location.RealPath
+		if location.VirtualPath != "" {
+			packagePath = location.VirtualPath
+		}
+		packagePath = strings.TrimPrefix(packagePath, "/")
+		switch s.Scheme {
+		case source.ImageScheme:
+			image := strings.ReplaceAll(s.ImageMetadata.UserInput, ":/", "//")
+			return fmt.Sprintf("%s:/%s", image, packagePath)
+		case source.FileScheme:
+			if isArchive(inputPath) {
+				return fmt.Sprintf("%s:/%s", inputPath, packagePath)
+			}
+			return inputPath
+		case source.DirectoryScheme:
+			if inputPath != "" {
+				return fmt.Sprintf("%s/%s", inputPath, packagePath)
+			}
+			return packagePath
+		}
+	}
+	return fmt.Sprintf("%s%s", inputPath, s.ImageMetadata.UserInput)
+}
+
+// toGithubManifests manifests, each of which represents a specific location that has dependencies
+func toGithubManifests(s *sbom.SBOM) Manifests {
+	manifests := map[string]*Manifest{}
+
+	for _, p := range s.Artifacts.PackageCatalog.Sorted() {
+		path := toPath(s.Source, p)
+		manifest, ok := manifests[path]
+		if !ok {
+			manifest = &Manifest{
+				Name: path,
+				File: FileInfo{
+					SourceLocation: path,
+				},
+				Resolved: DependencyGraph{},
+			}
+			fs := filesystem(p)
+			if fs != "" {
+				manifest.Metadata = Metadata{
+					"syft:filesystem": fs,
+				}
+			}
+			manifests[path] = manifest
+		}
+
+		name := dependencyName(p)
+		manifest.Resolved[name] = DependencyNode{
+			Purl:         p.PURL,
+			Metadata:     toDependencyMetadata(p),
+			Relationship: toDependencyRelationshipType(p),
+			Scope:        toDependencyScope(p),
+			Dependencies: toDependencies(s, p),
+		}
+	}
+
+	out := Manifests{}
+	for k, v := range manifests {
+		out[k] = *v
+	}
+	return out
+}
+
+// dependencyName to make things a little nicer to read; this might end up being lossy
+func dependencyName(p pkg.Package) string {
+	purl, err := packageurl.FromString(p.PURL)
+	if err != nil {
+		log.Warnf("Invalid PURL for package: '%s' PURL: '%s' (%w)", p.Name, p.PURL, err)
+		return ""
+	}
+	// don't use qualifiers for this
+	purl.Qualifiers = nil
+	return purl.ToString()
+}
+
+func toDependencyScope(_ pkg.Package) DependencyScope {
+	return DependencyScopeRuntime
+}
+
+func toDependencyRelationshipType(_ pkg.Package) DependencyRelationship {
+	return DependencyRelationshipDirect
+}
+
+func toDependencyMetadata(_ pkg.Package) Metadata {
+	// We have limited properties: up to 8 with reasonably small values
+	// For now, we are encoding the location as part of the key, we are encoding PURLs with most
+	// of the other information Grype might need; and the distro information at the top level
+	// so we don't need anything here yet
+	return Metadata{}
+}
+
+func toDependencies(s *sbom.SBOM, p pkg.Package) (out []string) {
+	for _, r := range s.Relationships {
+		if r.From.ID() == p.ID() {
+			if p, ok := r.To.(pkg.Package); ok {
+				out = append(out, dependencyName(p))
+			}
+		}
+	}
+	return
+}
diff --git a/internal/formats/github/encoder_test.go b/internal/formats/github/encoder_test.go
@@ -0,0 +1,161 @@
+package github
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/anchore/packageurl-go"
+	"github.com/anchore/syft/syft/linux"
+	"github.com/anchore/syft/syft/pkg"
+	"github.com/anchore/syft/syft/sbom"
+	"github.com/anchore/syft/syft/source"
+)
+
+func Test_toGithubModel(t *testing.T) {
+	s := sbom.SBOM{
+		Source: source.Metadata{
+			Scheme: source.ImageScheme,
+			ImageMetadata: source.ImageMetadata{
+				UserInput:    "ubuntu:18.04",
+				Architecture: "amd64",
+			},
+		},
+		Artifacts: sbom.Artifacts{
+			LinuxDistribution: &linux.Release{
+				ID:        "ubuntu",
+				VersionID: "18.04",
+				IDLike:    []string{"debian"},
+			},
+			PackageCatalog: pkg.NewCatalog(),
+		},
+	}
+	for _, p := range []pkg.Package{
+		{
+			Name:    "pkg-1",
+			Version: "1.0.1",
+			Locations: []source.Location{{
+				Coordinates: source.Coordinates{
+					RealPath:     "/usr/lib",
+					FileSystemID: "fsid-1",
+				},
+			}},
+		},
+		{
+			Name:    "pkg-2",
+			Version: "2.0.2",
+			Locations: []source.Location{{
+				Coordinates: source.Coordinates{
+					RealPath:     "/usr/lib",
+					FileSystemID: "fsid-1",
+				},
+			}},
+		},
+		{
+			Name:    "pkg-3",
+			Version: "3.0.3",
+			Locations: []source.Location{{
+				Coordinates: source.Coordinates{
+					RealPath:     "/etc",
+					FileSystemID: "fsid-1",
+				},
+			}},
+		},
+	} {
+		p.PURL = packageurl.NewPackageURL(
+			"generic",
+			"",
+			p.Name,
+			p.Version,
+			nil,
+			"",
+		).ToString()
+		s.Artifacts.PackageCatalog.Add(p)
+	}
+
+	actual := toGithubModel(&s)
+
+	expected := DependencySnapshot{
+		Version: 0,
+		Detector: DetectorMetadata{
+			Name:    "syft",
+			Version: "0.0.0-dev",
+			URL:     "https://github.com/anchore/syft",
+		},
+		Metadata: Metadata{
+			"syft:distro": "pkg:generic/[email protected]?like=debian",
+		},
+		Scanned: actual.Scanned,
+		Manifests: Manifests{
+			"ubuntu:18.04:/usr/lib": Manifest{
+				Name: "ubuntu:18.04:/usr/lib",
+				File: FileInfo{
+					SourceLocation: "ubuntu:18.04:/usr/lib",
+				},
+				Metadata: Metadata{
+					"syft:filesystem": "fsid-1",
+				},
+				Resolved: DependencyGraph{
+					"pkg:generic/[email protected]": DependencyNode{
+						Purl:         "pkg:generic/[email protected]",
+						Scope:        DependencyScopeRuntime,
+						Relationship: DependencyRelationshipDirect,
+					},
+					"pkg:generic/[email protected]": DependencyNode{
+						Purl:         "pkg:generic/[email protected]",
+						Scope:        DependencyScopeRuntime,
+						Relationship: DependencyRelationshipDirect,
+					},
+				},
+			},
+			"ubuntu:18.04:/etc": Manifest{
+				Name: "ubuntu:18.04:/etc",
+				File: FileInfo{
+					SourceLocation: "ubuntu:18.04:/etc",
+				},
+				Metadata: Metadata{
+					"syft:filesystem": "fsid-1",
+				},
+				Resolved: DependencyGraph{
+					"pkg:generic/[email protected]": DependencyNode{
+						Purl:         "pkg:generic/[email protected]",
+						Scope:        DependencyScopeRuntime,
+						Relationship: DependencyRelationshipDirect,
+					},
+				},
+			},
+		},
+	}
+
+	// just using JSONEq because it gives a comprehensible diff
+	s1, _ := json.Marshal(expected)
+	s2, _ := json.Marshal(actual)
+	assert.JSONEq(t, string(s1), string(s2))
+
+	// Just test the other schemes:
+	s.Source.Path = "."
+	s.Source.Scheme = source.DirectoryScheme
+	actual = toGithubModel(&s)
+	assert.Equal(t, "etc", actual.Manifests["etc"].Name)
+
+	s.Source.Path = "./artifacts"
+	s.Source.Scheme = source.DirectoryScheme
+	actual = toGithubModel(&s)
+	assert.Equal(t, "artifacts/etc", actual.Manifests["artifacts/etc"].Name)
+
+	s.Source.Path = "/artifacts"
+	s.Source.Scheme = source.DirectoryScheme
+	actual = toGithubModel(&s)
+	assert.Equal(t, "/artifacts/etc", actual.Manifests["/artifacts/etc"].Name)
+
+	s.Source.Path = "./executable"
+	s.Source.Scheme = source.FileScheme
+	actual = toGithubModel(&s)
+	assert.Equal(t, "executable", actual.Manifests["executable"].Name)
+
+	s.Source.Path = "./archive.tar.gz"
+	s.Source.Scheme = source.FileScheme
+	actual = toGithubModel(&s)
+	assert.Equal(t, "archive.tar.gz:/etc", actual.Manifests["archive.tar.gz:/etc"].Name)
+}
diff --git a/internal/formats/github/format.go b/internal/formats/github/format.go
@@ -0,0 +1,29 @@
+package github
+
+import (
+	"encoding/json"
+	"io"
+
+	"github.com/anchore/syft/syft/sbom"
+)
+
+const ID sbom.FormatID = "github-0-json"
+
+func Format() sbom.Format {
+	return sbom.NewFormat(
+		ID,
+		func(writer io.Writer, sbom sbom.SBOM) error {
+			bom := toGithubModel(&sbom)
+
+			bytes, err := json.MarshalIndent(bom, "", "  ")
+			if err != nil {
+				return err
+			}
+			_, err = writer.Write(bytes)
+
+			return err
+		},
+		nil,
+		nil,
+	)
+}