feat: add postgresql classifier (#1536)

* add postgresql classifier
Signed-off-by: witchcraze <witchcraze@gmail.com>

* revert package dedup test upgrade

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

---------

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>
Co-authored-by: Alex Goodman <alex.goodman@anchore.com>

syft/pkg/cataloger/binary/cataloger_test.go

@@ -19,6 +19,62 @@ func TestClassifierCataloger_DefaultClassifiers_PositiveCases(t *testing.T) {
 		fixtureDir string
 		expected   pkg.Package
 	}{
+		{
+			name:       "positive-postgresql-15beta4",
+			fixtureDir: "test-fixtures/classifiers/positive/postgresql-15beta4",
+			expected: pkg.Package{
+				Name:      "postgresql",
+				Version:   "15beta4",
+				Type:      "binary",
+				PURL:      "pkg:generic/postgresql@15beta4",
+				Locations: singleLocation("postgres"),
+				Metadata: pkg.BinaryMetadata{
+					Classifier: "postgresql-binary",
+				},
+			},
+		},
+		{
+			name:       "positive-postgresql-15.1",
+			fixtureDir: "test-fixtures/classifiers/positive/postgresql-15.1",
+			expected: pkg.Package{
+				Name:      "postgresql",
+				Version:   "15.1",
+				Type:      "binary",
+				PURL:      "pkg:generic/postgresql@15.1",
+				Locations: singleLocation("postgres"),
+				Metadata: pkg.BinaryMetadata{
+					Classifier: "postgresql-binary",
+				},
+			},
+		},
+		{
+			name:       "positive-postgresql-9.6.24",
+			fixtureDir: "test-fixtures/classifiers/positive/postgresql-9.6.24",
+			expected: pkg.Package{
+				Name:      "postgresql",
+				Version:   "9.6.24",
+				Type:      "binary",
+				PURL:      "pkg:generic/postgresql@9.6.24",
+				Locations: singleLocation("postgres"),
+				Metadata: pkg.BinaryMetadata{
+					Classifier: "postgresql-binary",
+				},
+			},
+		},
+		{
+			name:       "positive-postgresql-9.5alpha1",
+			fixtureDir: "test-fixtures/classifiers/positive/postgresql-9.5alpha1",
+			expected: pkg.Package{
+				Name:      "postgresql",
+				Version:   "9.5alpha1",
+				Type:      "binary",
+				PURL:      "pkg:generic/postgresql@9.5alpha1",
+				Locations: singleLocation("postgres"),
+				Metadata: pkg.BinaryMetadata{
+					Classifier: "postgresql-binary",
+				},
+			},
+		},
 		{
 			name:       "positive-traefik-2.9.6",
 			fixtureDir: "test-fixtures/classifiers/positive/traefik-2.9.6",

syft/pkg/cataloger/binary/default_classifiers.go

@@ -175,4 +175,16 @@ var defaultClassifiers = []classifier{
 		Package: "traefik",
 		PURL:    mustPURL("pkg:generic/traefik@version"),
 	},
+	{
+		Class:    "postgresql-binary",
+		FileGlob: "**/postgres",
+		EvidenceMatcher: fileContentsVersionMatcher(
+			// [NUL]PostgreSQL 15beta4
+			// [NUL]PostgreSQL 15.1
+			// [NUL]PostgreSQL 9.6.24
+			// ?PostgreSQL 9.5alpha1
+			`(?m)(\x00|\?)PostgreSQL (?P<version>[0-9]+(\.[0-9]+)?(\.[0-9]+)?(alpha[0-9]|beta[0-9]|rc[0-9])?)`),
+		Package: "postgresql",
+		PURL:    mustPURL("pkg:generic/postgresql@version"),
+	},
 }

syft/pkg/cataloger/binary/test-fixtures/classifiers/positive/postgresql-9.5alpha1/postgres

@@ -0,0 +1,5 @@
+byteaout
+byteain
+?PostgreSQL 9.5alpha1 on x86_64-unknown-linux-gnu, compiled by gcc (Debian 4.9.2-10) 4.9.2, 64-bit
+/tmp/buildd/postgresql-9.5-9.5~alpha1/build/../src/backend/utils/adt/windowfuncs.c
+argument of ntile must be greater than zero