check OS

analyzer/os/amazonlinux/amazonlinux.go

@@ -0,0 +1,51 @@
+package amazonlinux
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/knqyf263/fanal/analyzer/os"
+
+	"github.com/knqyf263/fanal/analyzer"
+	"github.com/knqyf263/fanal/extractor"
+)
+
+func init() {
+	analyzer.RegisterOSAnalyzer(&amazonlinuxOSAnalyzer{})
+}
+
+type amazonlinuxOSAnalyzer struct{}
+
+func (a amazonlinuxOSAnalyzer) Analyze(fileMap extractor.FileMap) (analyzer.OS, error) {
+	for _, filename := range a.RequiredFiles() {
+		file, ok := fileMap[filename]
+		if !ok {
+			continue
+		}
+		scanner := bufio.NewScanner(bytes.NewBuffer(file))
+		for scanner.Scan() {
+			line := scanner.Text()
+			fields := strings.Fields(line)
+			// Amazon Linuxという名称が確認できたときのみ
+			if strings.HasPrefix(line, "Amazon Linux release 2") {
+				return analyzer.OS{
+					Family: os.Amazon,
+					Name:   fmt.Sprintf("%s %s", fields[3], fields[4]),
+				}, nil
+			} else if strings.HasPrefix(line, "Amazon Linux") {
+				return analyzer.OS{
+					Family: os.Amazon,
+					Name:   strings.Join(fields[2:], " "),
+				}, nil
+			}
+		}
+	}
+	return analyzer.OS{}, errors.New("amzn: Not match")
+}
+
+func (a amazonlinuxOSAnalyzer) RequiredFiles() []string {
+	return []string{"etc/system-release"}
+}