Support Alpine Linux #194 (#545)

* Support Alpine Linux #194

* Fix testcase

* Fix README

* Fix dep files

* Fix changelog

* Bump up version

oval/alpine.go

@@ -0,0 +1,82 @@
+/* Vuls - Vulnerability Scanner
+Copyright (C) 2016  Future Architect, Inc. Japan.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package oval
+
+import (
+	"github.com/future-architect/vuls/config"
+	"github.com/future-architect/vuls/models"
+	"github.com/future-architect/vuls/util"
+	ovalmodels "github.com/kotakanbe/goval-dictionary/models"
+)
+
+// Alpine is the struct of Alpine Linux
+type Alpine struct {
+	Base
+}
+
+// NewAlpine creates OVAL client for SUSE
+func NewAlpine() Alpine {
+	return Alpine{
+		Base{
+			family: config.Alpine,
+		},
+	}
+}
+
+// FillWithOval returns scan result after updating CVE info by OVAL
+func (o Alpine) FillWithOval(r *models.ScanResult) (err error) {
+	var relatedDefs ovalResult
+	if o.isFetchViaHTTP() {
+		if relatedDefs, err = getDefsByPackNameViaHTTP(r); err != nil {
+			return err
+		}
+	} else {
+		if relatedDefs, err = getDefsByPackNameFromOvalDB(r); err != nil {
+			return err
+		}
+	}
+	for _, defPacks := range relatedDefs.entries {
+		o.update(r, defPacks)
+	}
+
+	return nil
+}
+
+func (o Alpine) update(r *models.ScanResult, defPacks defPacks) {
+	ovalContent := *o.convertToModel(&defPacks.def)
+	cveID := defPacks.def.Advisory.Cves[0].CveID
+	vinfo, ok := r.ScannedCves[cveID]
+	if !ok {
+		util.Log.Debugf("%s is newly detected by OVAL", cveID)
+		vinfo = models.VulnInfo{
+			CveID:       cveID,
+			Confidence:  models.OvalMatch,
+			CveContents: models.NewCveContents(ovalContent),
+		}
+	}
+
+	vinfo.AffectedPackages = defPacks.toPackStatuses(r.Family)
+	vinfo.AffectedPackages.Sort()
+	r.ScannedCves[cveID] = vinfo
+}
+
+func (o Alpine) convertToModel(def *ovalmodels.Definition) *models.CveContent {
+	return &models.CveContent{
+		CveID: def.Advisory.Cves[0].CveID,
+	}
+}