Fix race in shutdown: context should be shut down in case of error.

cmd/context.go

@@ -139,7 +139,13 @@ func ShutdownContext() {
 			context.fileMemProfile = nil
 		}
 	}
-	context.database.Close()
-	context.downloader.Shutdown()
-	context.progress.Shutdown()
+	if context.database != nil {
+		context.database.Close()
+	}
+	if context.downloader != nil {
+		context.downloader.Shutdown()
+	}
+	if context.progress != nil {
+		context.progress.Shutdown()
+	}
 }

main.go

@@ -39,6 +39,7 @@ func loadConfig(command *commander.Command) error {
 			}
 			if !os.IsNotExist(err) {
 				fatal(fmt.Errorf("error loading config file %s: %s", configLocation, err))
+				return nil
 			}
 		}
 
@@ -67,6 +68,9 @@ func main() {
 		fatal(err)
 		return
 	}
+	if returnCode != 0 {
+		return
+	}
 
 	err = cmd.InitContext(command)
 	if err != nil {