ui/progress: don't print progress on non-interactive terminals

This reverts to the old behavior of not printing progress updates on
non-interactive terminals. It was accidentally changed in #3058.

cmd/restic/progress.go

@@ -17,7 +17,7 @@ func newProgressMax(show bool, max uint64, description string) *progress.Counter
 
 	interval := time.Second / 60
 	if !stdoutIsTerminal() {
-		interval = time.Second
+		interval = 0
 	} else {
 		fps, err := strconv.ParseInt(os.Getenv("RESTIC_PROGRESS_FPS"), 10, 64)
 		if err == nil && fps >= 1 {

doc/manual_rest.rst

@@ -133,15 +133,14 @@ command:
           --tls-client-cert file       path to a file containing PEM encoded TLS client certificate and private key
       -v, --verbose n                  be verbose (specify multiple times or a level using --verbose=n, max level/times is 3)
 
-Subcommand that support showing progress information such as ``backup``,
+Subcommands that support showing progress information such as ``backup``,
 ``check`` and ``prune`` will do so unless the quiet flag ``-q`` or
-``--quiet`` is set. When running from a non-interactive console progress
+``--quiet`` is set. For interactive consoles the environment variable
-reporting will be limited to once every 10 seconds to not fill your
+``RESTIC_PROGRESS_FPS`` can be used to control the frequency of progress
-logs. Use ``backup`` with the quiet flag ``-q`` or ``--quiet`` to skip
+reporting. When running from a non-interactive console progress reporting
-the initial scan of the source directory, this may shorten the backup
+is disabled to not fill your logs.
-time needed for large directories.
 
-Additionally on Unix systems if ``restic`` receives a SIGUSR1 signal the
+Additionally, on Unix systems if ``restic`` receives a SIGUSR1 signal the
 current progress will be written to the standard output so you can check up
 on the status at will.
 

internal/ui/progress/counter.go

@@ -41,7 +41,9 @@ func New(interval time.Duration, report Func) *Counter {
 		start:   time.Now(),
 		stopped: make(chan struct{}),
 		stop:    make(chan struct{}),
-		tick:    time.NewTicker(interval),
+	}
+	if interval > 0 {
+		c.tick = time.NewTicker(interval)
 	}
 
 	go c.run()
@@ -64,7 +66,9 @@ func (c *Counter) Done() {
 	if c == nil {
 		return
 	}
-	c.tick.Stop()
+	if c.tick != nil {
+		c.tick.Stop()
+	}
 	close(c.stop)
 	<-c.stopped    // Wait for last progress report.
 	*c = Counter{} // Prevent reuse.
@@ -85,11 +89,15 @@ func (c *Counter) run() {
 		c.report(c.get(), time.Since(c.start), true)
 	}()
 
+	var tick <-chan time.Time
+	if c.tick != nil {
+		tick = c.tick.C
+	}
 	for {
 		var now time.Time
 
 		select {
-		case now = <-c.tick.C:
+		case now = <-tick:
 		case sig := <-signals.ch:
 			debug.Log("Signal received: %v\n", sig)
 			now = time.Now()

internal/ui/progress/counter_test.go

@@ -53,3 +53,22 @@ func TestCounterNil(t *testing.T) {
 	c.Add(1)
 	c.Done()
 }
+
+func TestCounterNoTick(t *testing.T) {
+	finalSeen := false
+	otherSeen := false
+
+	report := func(value uint64, d time.Duration, final bool) {
+		if final {
+			finalSeen = true
+		} else {
+			otherSeen = true
+		}
+	}
+	c := progress.New(0, report)
+	time.Sleep(time.Millisecond)
+	c.Done()
+
+	test.Assert(t, finalSeen, "final call did not happen")
+	test.Assert(t, !otherSeen, "unexpected status update")
+}