add xml-report

add struct tag for encoding/xml

update README

update glide.lock

report/xml.go

@@ -0,0 +1,54 @@
+package report
+
+import (
+	"bytes"
+	"encoding/xml"
+	"fmt"
+	"io/ioutil"
+	"path/filepath"
+	"time"
+
+	"github.com/future-architect/vuls/models"
+)
+
+const (
+	vulsOpenTag  = "<vulsreport>"
+	vulsCloseTag = "</vulsreport>"
+)
+
+// XMLWriter writes results to file.
+type XMLWriter struct {
+	ScannedAt time.Time
+}
+
+func (w XMLWriter) Write(scanResults []models.ScanResult) (err error) {
+	var path string
+	if path, err = ensureResultDir(w.ScannedAt); err != nil {
+		return fmt.Errorf("Failed to make direcotory/symlink : %s", err)
+	}
+
+	for _, scanResult := range scanResults {
+		scanResult.ScannedAt = w.ScannedAt
+	}
+
+	var xmlBytes []byte
+	for _, r := range scanResults {
+		xmlPath := ""
+		if len(r.Container.ContainerID) == 0 {
+			xmlPath = filepath.Join(path, fmt.Sprintf("%s.xml", r.ServerName))
+		} else {
+			xmlPath = filepath.Join(path,
+				fmt.Sprintf("%s_%s.xml", r.ServerName, r.Container.Name))
+		}
+
+		if xmlBytes, err = xml.Marshal(r); err != nil {
+			return fmt.Errorf("Failed to Marshal to XML: %s", err)
+		}
+
+		allBytes := bytes.Join([][]byte{[]byte(xml.Header + vulsOpenTag), xmlBytes, []byte(vulsCloseTag)}, []byte{})
+		if err := ioutil.WriteFile(xmlPath, allBytes, 0600); err != nil {
+			return fmt.Errorf("Failed to write XML. path: %s, err: %s", xmlPath, err)
+		}
+	}
+	return nil
+}