add first distro support

imgbom/distro/distro.go

@@ -0,0 +1,31 @@
+package distro
+
+import (
+	"fmt"
+
+	hashiVer "github.com/hashicorp/go-version"
+)
+
+type Distro struct {
+	Type    Type
+	Version *hashiVer.Version
+}
+
+func NewDistro(t Type, ver string) (Distro, error) {
+	verObj, err := hashiVer.NewVersion(ver)
+	if err != nil {
+		return Distro{}, fmt.Errorf("could not create distro version: %w", err)
+	}
+	return Distro{
+		Type:    t,
+		Version: verObj,
+	}, nil
+}
+
+func (d Distro) MajorVersion() int {
+	return d.Version.Segments()[0]
+}
+
+func (d Distro) String() string {
+	return fmt.Sprintf("%s %s", d.Type, d.Version)
+}

imgbom/distro/identify.go

@@ -0,0 +1,11 @@
+package distro
+
+import (
+	"github.com/anchore/stereoscope/pkg/image"
+)
+
+func Identify(img *image.Image) (Distro, error) {
+	// TODO: implement me based off of https://github.com/anchore/anchore-engine/blob/78b23d7e8f007005c070673405b5e23730a660e0/anchore_engine/analyzers/utils.py#L131
+
+	return NewDistro(UnknownDistro, "0.0.0")
+}

imgbom/distro/type.go

@@ -0,0 +1,52 @@
+package distro
+
+const (
+	UnknownDistro Type = iota
+	Debian
+	// Ubuntu
+	// RedHat
+	// CentOS
+	// Fedora
+	// Alpine
+	// Busybox
+	// AmazonLinux
+	// OracleLinux
+	// ArchLinux
+)
+
+type Type int
+
+var distroStr = []string{
+	"UnknownDistro",
+	"Debian",
+	// "Ubuntu",
+	// "RedHat",
+	// "CentOS",
+	// "Fedora",
+	// "Alpine",
+	// "Busybox",
+	// "AmazonLinux",
+	// "OracleLinux",
+	// "ArchLinux",
+}
+
+var All = []Type{
+	Debian,
+	// Ubuntu,
+	// RedHat,
+	// CentOS,
+	// Fedora,
+	// Alpine,
+	// Busybox,
+	// AmazonLinux,
+	// OracleLinux,
+	// ArchLinux,
+}
+
+func (t Type) String() string {
+	if int(t) >= len(distroStr) || t < 0 {
+		return distroStr[0]
+	}
+
+	return distroStr[t]
+}