refactor(detector): standardize db.NewDB to db.CloseDB (#1380)

* feat(subcmds/report,server): read environment variables when configPath is ""

* refactor: standardize db.NewDB to db.CloseDB

* chore: clean up import

* chore: error wrap

* chore: update goval-dictionary

* fix(oval): return Pseudo instead of nil for client

* chore: fix comment

* fix: lint error

subcmds/server.go

@@ -11,10 +11,11 @@ import (
 	"os"
 	"path/filepath"
 
+	"github.com/google/subcommands"
+
 	"github.com/future-architect/vuls/config"
 	"github.com/future-architect/vuls/logging"
 	"github.com/future-architect/vuls/server"
-	"github.com/google/subcommands"
 )
 
 // ServerCmd is subcommand for server
@@ -93,9 +94,23 @@ func (p *ServerCmd) SetFlags(f *flag.FlagSet) {
 func (p *ServerCmd) Execute(_ context.Context, _ *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
 	logging.Log = logging.NewCustomLogger(config.Conf.Debug, config.Conf.Quiet, config.Conf.LogToFile, config.Conf.LogDir, "", "")
 	logging.Log.Infof("vuls-%s-%s", config.Version, config.Revision)
-	if err := config.Load(p.configPath); err != nil {
-		logging.Log.Errorf("Error loading %s. err: %+v", p.configPath, err)
-		return subcommands.ExitUsageError
+
+	if p.configPath == "" {
+		for _, cnf := range []config.VulnDictInterface{
+			&config.Conf.CveDict,
+			&config.Conf.OvalDict,
+			&config.Conf.Gost,
+			&config.Conf.Exploit,
+			&config.Conf.Metasploit,
+			&config.Conf.KEVuln,
+		} {
+			cnf.Init()
+		}
+	} else {
+		if err := config.Load(p.configPath); err != nil {
+			logging.Log.Errorf("Error loading %s. err: %+v", p.configPath, err)
+			return subcommands.ExitUsageError
+		}
 	}
 
 	logging.Log.Info("Validating config...")