try to clean up cache if updating grypeDB fails

Signed-off-by: Matthias Bertschy <matthias.bertschy@gmail.com>

adapters/v1/grype.go

@@ -2,6 +2,7 @@ package v1
 
 import (
 	"context"
+	"os"
 	"path"
 	"sync"
 	"time"
@@ -87,11 +88,22 @@ func (g *GrypeAdapter) Ready(ctx context.Context) bool {
 		logger.L().Info("updating grype DB",
 			helpers.String("listingURL", g.dbConfig.ListingURL))
 		var err error
-		g.store, g.dbStatus, g.dbCloser, err = grype.LoadVulnerabilityDB(g.dbConfig, true)
+		newStore, newDbStatus, newDbCloser, err := grype.LoadVulnerabilityDB(g.dbConfig, true)
 		if err != nil {
 			logger.L().Ctx(ctx).Error("failed to update grype DB", helpers.Error(err))
+			if g.dbCloser != nil {
+				g.dbCloser.Close()
+				logger.L().Debug("closed DB")
+			}
+			err := os.RemoveAll(g.dbConfig.DBRootDir)
+			_ = os.Mkdir(g.dbConfig.DBRootDir, 0755)
+			logger.L().Debug("cleaned up cache", helpers.Error(err),
+				helpers.String("DBRootDir", g.dbConfig.DBRootDir))
 			return false
 		}
+		g.store = newStore
+		g.dbStatus = newDbStatus
+		g.dbCloser = newDbCloser
 		g.lastDbUpdate = now
 		logger.L().Info("grype DB updated")
 		return true