replace ad-hoc context.TODO() with gopts.ctx, so that cancellation

can properly trickle down from cmd_*.

gh-1434

internal/archiver/archive_reader.go

@@ -103,7 +103,7 @@ func (r *Reader) Archive(ctx context.Context, name string, rd io.Reader, p *rest
 
 	debug.Log("snapshot saved as %v", id.Str())
 
-	err = repo.Flush()
+	err = repo.Flush(ctx)
 	if err != nil {
 		return nil, restic.ID{}, err
 	}

internal/archiver/archiver.go

@@ -764,7 +764,7 @@ func (arch *Archiver) Snapshot(ctx context.Context, p *restic.Progress, paths, t
 	debug.Log("workers terminated")
 
 	// flush repository
-	err = arch.repo.Flush()
+	err = arch.repo.Flush(ctx)
 	if err != nil {
 		return nil, restic.ID{}, err
 	}

internal/archiver/archiver_duplication_test.go

@@ -144,7 +144,7 @@ func testArchiverDuplication(t *testing.T) {
 
 	wg.Wait()
 
-	err = repo.Flush()
+	err = repo.Flush(context.Background())
 	if err != nil {
 		t.Fatal(err)
 	}

internal/archiver/archiver_test.go

@@ -248,7 +248,7 @@ func testParallelSaveWithDuplication(t *testing.T, seed int) {
 		rtest.OK(t, <-errChan)
 	}
 
-	rtest.OK(t, repo.Flush())
+	rtest.OK(t, repo.Flush(context.Background()))
 	rtest.OK(t, repo.SaveIndex(context.TODO()))
 
 	chkr := createAndInitChecker(t, repo)