Implement support for Chainguard Linux (#1198)

Signed-off-by: Dan Luhring <dluhring@chainguard.dev>

grype/db/v3/namespace_test.go

@@ -186,6 +186,10 @@ func Test_NamespaceForDistro(t *testing.T) {
 			version:  "2022yzblah", // Wolfi is a rolling release
 			expected: "wolfi:rolling",
 		},
+		{
+			dist:     distro.Chainguard,
+			expected: "chainguard:rolling",
+		},
 	}
 
 	observedDistros := strset.New()

grype/db/v4/namespace/index_test.go

@@ -133,6 +133,7 @@ func TestIndex_NamespacesForDistro(t *testing.T) {
 		"ubuntu:distro:ubuntu:18.04",
 		"oracle:distro:oraclelinux:8",
 		"wolfi:distro:wolfi:rolling",
+		"chainguard:distro:chainguard:rolling",
 		"archlinux:distro:archlinux:rolling",
 	})
 
@@ -267,6 +268,12 @@ func TestIndex_NamespacesForDistro(t *testing.T) {
 				distro.NewNamespace("wolfi", osDistro.Wolfi, "rolling"),
 			},
 		},
+		{
+			distro: newDistro(t, osDistro.Chainguard, "20230214", []string{}),
+			namespaces: []*distro.Namespace{
+				distro.NewNamespace("chainguard", osDistro.Chainguard, "rolling"),
+			},
+		},
 	}
 
 	for _, test := range tests {

grype/db/v5/namespace/index_test.go

@@ -134,6 +134,7 @@ func TestIndex_NamespacesForDistro(t *testing.T) {
 		"ubuntu:distro:ubuntu:18.04",
 		"oracle:distro:oraclelinux:8",
 		"wolfi:distro:wolfi:rolling",
+		"chainguard:distro:chainguard:rolling",
 		"archlinux:distro:archlinux:rolling",
 	})
 
@@ -310,6 +311,14 @@ func TestIndex_NamespacesForDistro(t *testing.T) {
 				distro.NewNamespace("wolfi", osDistro.Wolfi, "rolling"),
 			},
 		},
+		{
+
+			name:   "Chainguard matches chainguard rolling namespace",
+			distro: newDistro(t, osDistro.Chainguard, "20230214", []string{}),
+			namespaces: []*distro.Namespace{
+				distro.NewNamespace("chainguard", osDistro.Chainguard, "rolling"),
+			},
+		},
 		{
 
 			name:       "Gentoo doesn't match any namespace since the gentoo rolling namespace doesn't exist in index",

grype/distro/distro.go

@@ -87,7 +87,7 @@ func (d Distro) String() string {
 }
 
 func (d Distro) IsRolling() bool {
-	return d.Type == Wolfi || d.Type == ArchLinux || d.Type == Gentoo
+	return d.Type == Wolfi || d.Type == Chainguard || d.Type == ArchLinux || d.Type == Gentoo
 }
 
 // Unsupported Linux distributions

grype/distro/distro_test.go

@@ -208,6 +208,10 @@ func Test_NewDistroFromRelease_Coverage(t *testing.T) {
 			fixture: "test-fixtures/os/wolfi",
 			Type:    Wolfi,
 		},
+		{
+			fixture: "test-fixtures/os/chainguard",
+			Type:    Chainguard,
+		},
 	}
 
 	observedDistros := internal.NewStringSet()
@@ -243,7 +247,6 @@ func Test_NewDistroFromRelease_Coverage(t *testing.T) {
 			if test.Version != "" {
 				assert.Equal(t, d.Version.String(), test.Version)
 			}
-
 		})
 	}
 

grype/distro/test-fixtures/os/chainguard/etc/os-release

@@ -0,0 +1,5 @@
+ID=chainguard
+NAME="Chainguard"
+PRETTY_NAME="Chainguard"
+VERSION_ID="20230214"
+HOME_URL="https://chainguard.dev/"

grype/distro/type.go

@@ -29,6 +29,7 @@ const (
 	AlmaLinux    Type = "almalinux"
 	Gentoo       Type = "gentoo"
 	Wolfi        Type = "wolfi"
+	Chainguard   Type = "chainguard"
 )
 
 // All contains all Linux distribution options
@@ -52,6 +53,7 @@ var All = []Type{
 	AlmaLinux,
 	Gentoo,
 	Wolfi,
+	Chainguard,
 }
 
 // IDMapping connects a distro ID like "ubuntu" to a Distro type
@@ -75,6 +77,7 @@ var IDMapping = map[string]Type{
 	"almalinux":     AlmaLinux,
 	"gentoo":        Gentoo,
 	"wolfi":         Wolfi,
+	"chainguard":    Chainguard,
 }
 
 func TypeFromRelease(release linux.Release) Type {