fix(iso): restore boot UX and boot logs

audit/internal/platform/install_to_ram.go

@@ -12,6 +12,7 @@ import (
 )
 
 const installToRAMDir = "/dev/shm/bee-live"
+const copyProgressLogStep int64 = 100 * 1024 * 1024
 
 func (s *System) IsLiveMediaInRAM() bool {
 	return s.LiveMediaRAMState().InRAM
@@ -319,6 +320,7 @@ func copyFileLarge(ctx context.Context, src, dst string, logFunc func(string)) e
 	defer out.Close()
 	total := fi.Size()
 	var copied int64
+	var lastLogged int64
 	buf := make([]byte, 4*1024*1024)
 	for {
 		if err := ctx.Err(); err != nil {
@@ -330,7 +332,8 @@ func copyFileLarge(ctx context.Context, src, dst string, logFunc func(string)) e
 				return werr
 			}
 			copied += int64(n)
-			if logFunc != nil && total > 0 {
+			if shouldLogCopyProgress(copied, total, lastLogged) {
+				lastLogged = copied
 				pct := int(float64(copied) / float64(total) * 100)
 				logFunc(fmt.Sprintf("  %s / %s (%d%%)", humanBytes(copied), humanBytes(total), pct))
 			}
@@ -345,6 +348,19 @@ func copyFileLarge(ctx context.Context, src, dst string, logFunc func(string)) e
 	return out.Sync()
 }
 
+func shouldLogCopyProgress(copied, total, lastLogged int64) bool {
+	if total <= 0 || copied <= 0 {
+		return false
+	}
+	if copied >= total {
+		return copied > lastLogged
+	}
+	if copied < copyProgressLogStep {
+		return false
+	}
+	return copied-lastLogged >= copyProgressLogStep
+}
+
 func cpDir(ctx context.Context, src, dst string, logFunc func(string)) error {
 	return filepath.Walk(src, func(path string, fi os.FileInfo, err error) error {
 		if ctx.Err() != nil {

audit/internal/platform/install_to_ram_test.go

@@ -101,3 +101,26 @@ func TestEvaluateLiveMediaRAMState(t *testing.T) {
 		}
 	})
 }
+
+func TestShouldLogCopyProgress(t *testing.T) {
+	t.Parallel()
+
+	total := int64(250 * 1024 * 1024)
+	step := int64(100 * 1024 * 1024)
+
+	if shouldLogCopyProgress(step-1, total, 0) {
+		t.Fatal("progress logged too early")
+	}
+	if !shouldLogCopyProgress(step, total, 0) {
+		t.Fatal("expected log at first 100MB boundary")
+	}
+	if shouldLogCopyProgress(step+16*1024*1024, total, step) {
+		t.Fatal("progress logged again before next 100MB")
+	}
+	if !shouldLogCopyProgress(2*step, total, step) {
+		t.Fatal("expected log at second 100MB boundary")
+	}
+	if !shouldLogCopyProgress(total, total, 2*step) {
+		t.Fatal("expected final completion log")
+	}
+}