detectors/namespace: add alpine-release detector

worker/detectors/namespace/alpinerelease/alpinerelease.go

@@ -0,0 +1,60 @@
+// Copyright 2016 clair authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package alpinerelease
+
+import (
+	"bufio"
+	"bytes"
+	"regexp"
+
+	"github.com/coreos/clair/database"
+	"github.com/coreos/clair/worker/detectors"
+)
+
+const (
+	osName            = "alpine"
+	alpineReleasePath = "/etc/alpine-release"
+)
+
+var versionRegexp = regexp.MustCompile(`^(\d)+\.(\d)+\.(\d)+$`)
+
+func init() {
+	detectors.RegisterNamespaceDetector("alpine-release", &detector{})
+}
+
+// detector implements NamespaceDetector by reading the current version of
+// Alpine Linux from /etc/alpine-release.
+type detector struct{}
+
+func (d *detector) Detect(data map[string][]byte) *database.Namespace {
+	file, exists := data[alpineReleasePath]
+	if exists {
+		scanner := bufio.NewScanner(bytes.NewBuffer(file))
+		for scanner.Scan() {
+			line := scanner.Text()
+			match := versionRegexp.FindStringSubmatch(line)
+			if len(match) > 0 {
+				version := match[0]
+				return &database.Namespace{Name: osName + ":" + version}
+			}
+		}
+	}
+
+	return nil
+}
+
+func (d *detector) GetRequiredFiles() []string {
+	return []string{alpineReleasePath}
+}

worker/detectors/namespace/alpinerelease/alpinerelease_test.go

@@ -0,0 +1,43 @@
+// Copyright 2016 clair authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package alpinerelease
+
+import (
+	"testing"
+
+	"github.com/coreos/clair/database"
+	"github.com/coreos/clair/worker/detectors/namespace"
+)
+
+func TestAlpineReleaseNamespaceDetection(t *testing.T) {
+	testData := []namespace.TestData{
+		{
+			ExpectedNamespace: &database.Namespace{Name: "alpine:0.3.4"},
+			Data:              map[string][]byte{"/etc/alpine-release": []byte(`0.3.4`)},
+		},
+		{
+			ExpectedNamespace: &database.Namespace{Name: "alpine:0.3.4"},
+			Data: map[string][]byte{"/etc/alpine-release": []byte(`
+0.3.4
+`)},
+		},
+		{
+			ExpectedNamespace: nil,
+			Data:              map[string][]byte{},
+		},
+	}
+
+	namespace.TestDetector(t, &detector{}, testData)
+}