Show restore progress details

internal/restic/restic.go

@@ -280,12 +280,17 @@ func (r *Runner) List(ctx context.Context, repo model.Repository, snapshot, path
 	return items, scanner.Err()
 }
 
-func (r *Runner) Restore(ctx context.Context, repo model.Repository, task model.RestoreTask) error {
-	args := []string{"restore", task.SnapshotID, "--target", task.Target}
+func (r *Runner) Restore(ctx context.Context, repo model.Repository, task model.RestoreTask, progress ProgressCallback) error {
+	args := []string{"restore", task.SnapshotID, "--target", task.Target, "--json"}
 	for _, include := range task.Includes {
 		args = append(args, "--include", include)
 	}
-	return r.run(ctx, repo, args, nil, nil)
+	return r.run(ctx, repo, args, func(line []byte) {
+		var status Progress
+		if json.Unmarshal(line, &status) == nil && status.MessageType == "status" && progress != nil {
+			progress(status)
+		}
+	}, nil)
 }
 
 func (r *Runner) run(ctx context.Context, repo model.Repository, args []string, onLine func([]byte), capture *[]byte) error {

internal/restic/restic_test.go

@@ -164,6 +164,32 @@ func TestBackupImageStreamsRawDeviceWithStableFilename(t *testing.T) {
 	}
 }
 
+func TestRestoreReportsProgress(t *testing.T) {
+	dir := t.TempDir()
+	argsPath := filepath.Join(dir, "args")
+	script := filepath.Join(dir, "restic")
+	body := fmt.Sprintf("#!/bin/sh\nprintf '%%s\\n' \"$@\" > '%s'\nprintf '%%s\\n' '{\"message_type\":\"status\",\"percent_done\":0.25,\"total_files\":8,\"files_done\":2,\"total_bytes\":4096,\"bytes_done\":1024,\"seconds_remaining\":30,\"current_files\":[\"/restore/file.txt\"]}'\n", argsPath)
+	if err := os.WriteFile(script, []byte(body), 0700); err != nil {
+		t.Fatal(err)
+	}
+	runner := &Runner{Binary: script, RuntimeDir: dir, Secrets: fakeSecrets{"password": "secret"}}
+	repo := model.Repository{Type: model.RepositoryLocal, Location: "/repo", PasswordRef: "password"}
+	task := model.RestoreTask{SnapshotID: "snap123", Target: "/target", Includes: []string{"/source/file.txt"}}
+	var progress Progress
+	if err := runner.Restore(context.Background(), repo, task, func(value Progress) { progress = value }); err != nil {
+		t.Fatal(err)
+	}
+	if progress.PercentDone != 0.25 || progress.FilesDone != 2 || progress.BytesDone != 1024 || progress.SecondsRemaining != 30 || len(progress.CurrentFiles) != 1 {
+		t.Fatalf("unexpected progress: %+v", progress)
+	}
+	args, _ := os.ReadFile(argsPath)
+	for _, expected := range []string{"restore", "snap123", "--target", "/target", "--json", "--include", "/source/file.txt"} {
+		if !strings.Contains(string(args), expected) {
+			t.Fatalf("arguments missing %q: %s", expected, args)
+		}
+	}
+}
+
 func TestStatsUsesRequestedRepositoryCountingMode(t *testing.T) {
 	dir := t.TempDir()
 	argsPath := filepath.Join(dir, "args")