Add trash can file versioning (fixes #1931)

internal/versioner/trashcan_test.go

@@ -0,0 +1,69 @@
+// Copyright (C) 2015 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package versioner
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestTrashcanCleanout(t *testing.T) {
+	// Verify that files older than the cutoff are removed, that files newer
+	// than the cutoff are *not* removed, and that empty directories are
+	// removed (best effort).
+
+	var testcases = []struct {
+		file         string
+		shouldRemove bool
+	}{
+		{"testdata/.stversions/file1", false},
+		{"testdata/.stversions/file2", true},
+		{"testdata/.stversions/keep1/file1", false},
+		{"testdata/.stversions/keep1/file2", false},
+		{"testdata/.stversions/keep2/file1", false},
+		{"testdata/.stversions/keep2/file2", true},
+		{"testdata/.stversions/remove/file1", true},
+		{"testdata/.stversions/remove/file2", true},
+	}
+
+	os.RemoveAll("testdata")
+	defer os.RemoveAll("testdata")
+
+	oldTime := time.Now().Add(-8 * 24 * time.Hour)
+	for _, tc := range testcases {
+		os.MkdirAll(filepath.Dir(tc.file), 0777)
+		if err := ioutil.WriteFile(tc.file, []byte("data"), 0644); err != nil {
+			t.Fatal(err)
+		}
+		if tc.shouldRemove {
+			if err := os.Chtimes(tc.file, oldTime, oldTime); err != nil {
+				t.Fatal(err)
+			}
+		}
+	}
+
+	versioner := NewTrashcan("default", "testdata", map[string]string{"cleanoutDays": "7"}).(*Trashcan)
+	if err := versioner.cleanoutArchive(); err != nil {
+		t.Fatal(err)
+	}
+
+	for _, tc := range testcases {
+		_, err := os.Lstat(tc.file)
+		if tc.shouldRemove && !os.IsNotExist(err) {
+			t.Error(tc.file, "should have been removed")
+		} else if !tc.shouldRemove && err != nil {
+			t.Error(tc.file, "should not have been removed")
+		}
+	}
+
+	if _, err := os.Lstat("testdata/.stversions/remove"); !os.IsNotExist(err) {
+		t.Error("empty directory should have been removed")
+	}
+}