prune: fix not working option

cmd/restic/cmd_prune.go

@@ -207,6 +207,7 @@ func runPruneWithRepo(ctx context.Context, opts PruneOptions, gopts GlobalOption
 
 		MaxUnusedBytes: opts.maxUnusedBytes,
 		MaxRepackBytes: opts.MaxRepackBytes,
+		SmallPackBytes: opts.SmallPackBytes,
 
 		RepackCacheableOnly: opts.RepackCacheableOnly,
 		RepackSmall:         opts.RepackSmall,

cmd/restic/cmd_prune_integration_test.go

@@ -13,14 +13,25 @@ import (
 )
 
 func testRunPrune(t testing.TB, gopts GlobalOptions, opts PruneOptions) {
+	t.Helper()
+	rtest.OK(t, testRunPruneOutput(gopts, opts))
+}
+
+func testRunPruneMustFail(t testing.TB, gopts GlobalOptions, opts PruneOptions) {
+	t.Helper()
+	err := testRunPruneOutput(gopts, opts)
+	rtest.Assert(t, err != nil, "expected non nil error")
+}
+
+func testRunPruneOutput(gopts GlobalOptions, opts PruneOptions) error {
 	oldHook := gopts.backendTestHook
 	gopts.backendTestHook = func(r backend.Backend) (backend.Backend, error) { return newListOnceBackend(r), nil }
 	defer func() {
 		gopts.backendTestHook = oldHook
 	}()
-	rtest.OK(t, withTermStatus(gopts, func(ctx context.Context, term *termstatus.Terminal) error {
+	return withTermStatus(gopts, func(ctx context.Context, term *termstatus.Terminal) error {
 		return runPrune(context.TODO(), opts, gopts, term)
-	}))
+	})
 }
 
 func TestPrune(t *testing.T) {
@@ -237,3 +248,20 @@ func testEdgeCaseRepo(t *testing.T, tarfile string, optionsCheck CheckOptions, o
 			"prune should have reported an error")
 	}
 }
+
+func TestPruneRepackSmallerThanSmoke(t *testing.T) {
+	env, cleanup := withTestEnvironment(t)
+	defer cleanup()
+
+	// the implementation is already unit tested, so just check that
+	// the setting reaches its goal
+	createPrunableRepo(t, env)
+	testRunPrune(t, env.gopts, PruneOptions{
+		SmallPackSize: "4M",
+		MaxUnused:     "5%",
+	})
+	testRunPruneMustFail(t, env.gopts, PruneOptions{
+		SmallPackSize: "500M",
+		MaxUnused:     "5%",
+	})
+}