alias: add new backend to create aliases for remote names #1049

The alias backend is a wrapper for an existing remote.
It allows you to name a "remote:path" as an "alias:".

backend/alias/alias_internal_test.go

@@ -0,0 +1,106 @@
+package alias
+
+import (
+	"fmt"
+	"path"
+	"path/filepath"
+	"sort"
+	"testing"
+
+	_ "github.com/ncw/rclone/backend/local" // pull in test backend
+	"github.com/ncw/rclone/fs"
+	"github.com/ncw/rclone/fs/config"
+	"github.com/stretchr/testify/require"
+)
+
+var (
+	remoteName = "TestAlias"
+	testPath   = "test"
+	filesPath  = filepath.Join(testPath, "files")
+)
+
+func prepare(t *testing.T, root string) {
+	config.LoadConfig()
+
+	// Configure the remote
+	config.FileSet(remoteName, "type", "alias")
+	config.FileSet(remoteName, "remote", root)
+}
+
+func TestNewFS(t *testing.T) {
+	type testEntry struct {
+		remote string
+		size   int64
+		isDir  bool
+	}
+	for testi, test := range []struct {
+		remoteRoot string
+		fsRoot     string
+		fsList     string
+		wantOK     bool
+		entries    []testEntry
+	}{
+		{"", "", "", true, []testEntry{
+			{"four", -1, true},
+			{"one%.txt", 6, false},
+			{"three", -1, true},
+			{"two.html", 7, false},
+		}},
+		{"", "four", "", true, []testEntry{
+			{"five", -1, true},
+			{"under four.txt", 9, false},
+		}},
+		{"", "", "four", true, []testEntry{
+			{"four/five", -1, true},
+			{"four/under four.txt", 9, false},
+		}},
+		{"four", "..", "", true, []testEntry{
+			{"four", -1, true},
+			{"one%.txt", 6, false},
+			{"three", -1, true},
+			{"two.html", 7, false},
+		}},
+		{"four", "../three", "", true, []testEntry{
+			{"underthree.txt", 9, false},
+		}},
+	} {
+		what := fmt.Sprintf("test %d remoteRoot=%q, fsRoot=%q, fsList=%q", testi, test.remoteRoot, test.fsRoot, test.fsList)
+
+		remoteRoot, err := filepath.Abs(filepath.FromSlash(path.Join("test/files", test.remoteRoot)))
+		require.NoError(t, err, what)
+		prepare(t, remoteRoot)
+		f, err := fs.NewFs(fmt.Sprintf("%s:%s", remoteName, test.fsRoot))
+		require.NoError(t, err, what)
+		gotEntries, err := f.List(test.fsList)
+		require.NoError(t, err, what)
+
+		sort.Sort(gotEntries)
+
+		require.Equal(t, len(test.entries), len(gotEntries), what)
+		for i, gotEntry := range gotEntries {
+			what := fmt.Sprintf("%s, entry=%d", what, i)
+			wantEntry := test.entries[i]
+
+			require.Equal(t, wantEntry.remote, gotEntry.Remote(), what)
+			require.Equal(t, wantEntry.size, int64(gotEntry.Size()), what)
+			_, isDir := gotEntry.(fs.Directory)
+			require.Equal(t, wantEntry.isDir, isDir, what)
+		}
+	}
+}
+
+func TestNewFSNoRemote(t *testing.T) {
+	prepare(t, "")
+	f, err := fs.NewFs(fmt.Sprintf("%s:", remoteName))
+
+	require.Error(t, err)
+	require.Nil(t, f)
+}
+
+func TestNewFSInvalidRemote(t *testing.T) {
+	prepare(t, "not_existing_test_remote:")
+	f, err := fs.NewFs(fmt.Sprintf("%s:", remoteName))
+
+	require.Error(t, err)
+	require.Nil(t, f)
+}