Add --quiet option to gitea dump (#22969)

Fixes: #19687

The --quiet options to gitea dump silences informational and less
important messages, but will still log warnings and errors to console.
Very useful in combination with cron backups and '-f -'.

Since --verbose and --quiet are incompatible with each other I made it
an error to specify both. To get the error message to be printed to
stderr I had to make this test after the NewServices()-call, which is
why there are three new blocks of code instead of two.

cmd/dump.go

@@ -112,6 +112,10 @@ It can be used for backup and capture Gitea server image to send to maintainer`,
 			Name:  "verbose, V",
 			Usage: "Show process details",
 		},
+		cli.BoolFlag{
+			Name:  "quiet, q",
+			Usage: "Only display warnings and errors",
+		},
 		cli.StringFlag{
 			Name:  "tempdir, t",
 			Value: os.TempDir(),
@@ -192,12 +196,25 @@ func runDump(ctx *cli.Context) error {
 	if _, err := setting.CfgProvider.Section("log.console").NewKey("STDERR", "true"); err != nil {
 		fatal("Setting console logger to stderr failed: %v", err)
 	}
+
+	// Set loglevel to Warn if quiet-mode is requested
+	if ctx.Bool("quiet") {
+		if _, err := setting.CfgProvider.Section("log.console").NewKey("LEVEL", "Warn"); err != nil {
+			fatal("Setting console log-level failed: %v", err)
+		}
+	}
+
 	if !setting.InstallLock {
 		log.Error("Is '%s' really the right config path?\n", setting.CustomConf)
 		return fmt.Errorf("gitea is not initialized")
 	}
 	setting.LoadSettings() // cannot access session settings otherwise
 
+	verbose := ctx.Bool("verbose")
+	if verbose && ctx.Bool("quiet") {
+		return fmt.Errorf("--quiet and --verbose cannot both be set")
+	}
+
 	stdCtx, cancel := installSignals()
 	defer cancel()
 
@@ -223,7 +240,6 @@ func runDump(ctx *cli.Context) error {
 		return err
 	}
 
-	verbose := ctx.Bool("verbose")
 	var iface interface{}
 	if fileName == "-" {
 		iface, err = archiver.ByExtension(fmt.Sprintf(".%s", outType))