Setup scan provider before checking arg to be able to opt out

Signed-off-by: Guillaume Lours <guillaume.lours@docker.com>

Author: glours

cmd/docker-scan/main.go

@@ -183,15 +183,15 @@ func runAuthentication(ctx context.Context, dockerCli command.Streams, flags opt
 }
 
 func runScan(ctx context.Context, cmd *cobra.Command, dockerCli command.Cli, flags options, args []string) error {
+	scanProvider, err := configureProvider(ctx, dockerCli, flags, provider.WithAuthConfig(func(hub *registry.IndexInfo) types.AuthConfig {
+		return command.ResolveAuthConfig(context.Background(), dockerCli, hub)
+	}))
 	if len(args) != 1 {
 		if err := cmd.Usage(); err != nil {
 			return err
 		}
 		return fmt.Errorf(`"docker scan" requires exactly 1 argument`)
 	}
-	scanProvider, err := configureProvider(ctx, dockerCli, flags, provider.WithAuthConfig(func(hub *registry.IndexInfo) types.AuthConfig {
-		return command.ResolveAuthConfig(context.Background(), dockerCli, hub)
-	}))
 	if err != nil {
 		return err
 	}