Incrementals for Groups SharePoint backup (#4205)

<!-- PR description-->

---

#### Does this PR need a docs update or release note?

- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No

#### Type of change

<!--- Please check the type of change your PR introduces: --->
- [x] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup

#### Issue(s)

<!-- Can reference multiple issues. Use one of the following "magic words" - "closes, fixes" to auto-close the Github issue. -->
* https://github.com/alcionai/corso/issues/3990

#### Test Plan

<!-- How will this be tested prior to merging.-->
- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E

src/internal/data/mock/collection.go

@@ -5,8 +5,6 @@ import (
 	"io"
 	"time"
 
-	"github.com/alcionai/clues"
-
 	"github.com/alcionai/corso/src/internal/data"
 	"github.com/alcionai/corso/src/pkg/backup/details"
 	"github.com/alcionai/corso/src/pkg/fault"
@@ -80,8 +78,13 @@ var (
 
 type Collection struct {
 	Path                 path.Path
-	ItemData             []*Item
+	Loc                  *path.Builder
+	ItemData             []data.Item
 	ItemsRecoverableErrs []error
+	CState               data.CollectionState
+
+	// For restore
+	AuxItems map[string]data.Item
 }
 
 func (c Collection) Items(ctx context.Context, errs *fault.Bus) <-chan data.Item {
@@ -93,8 +96,9 @@ func (c Collection) Items(ctx context.Context, errs *fault.Bus) <-chan data.Item
 		el := errs.Local()
 
 		for _, item := range c.ItemData {
-			if item.ReadErr != nil {
+			it, ok := item.(*Item)
-				el.AddRecoverable(ctx, item.ReadErr)
+			if ok && it.ReadErr != nil {
+				el.AddRecoverable(ctx, it.ReadErr)
 				continue
 			}
 
@@ -114,17 +118,48 @@ func (c Collection) FullPath() path.Path {
 }
 
 func (c Collection) PreviousPath() path.Path {
-	return nil
+	return c.Path
+}
+
+func (c Collection) LocationPath() *path.Builder {
+	return c.Loc
 }
 
 func (c Collection) State() data.CollectionState {
-	return data.NewState
+	return c.CState
 }
 
 func (c Collection) DoNotMergeItems() bool {
-	return true
+	return false
 }
 
-func (c Collection) FetchItemByName(ctx context.Context, name string) (data.Item, error) {
+func (c Collection) FetchItemByName(
-	return &Item{}, clues.New("not implemented")
+	ctx context.Context,
+	name string,
+) (data.Item, error) {
+	res := c.AuxItems[name]
+	if res == nil {
+		return nil, data.ErrNotFound
+	}
+
+	return res, nil
+}
+
+var _ data.RestoreCollection = &RestoreCollection{}
+
+type RestoreCollection struct {
+	data.Collection
+	AuxItems map[string]data.Item
+}
+
+func (rc RestoreCollection) FetchItemByName(
+	ctx context.Context,
+	name string,
+) (data.Item, error) {
+	res := rc.AuxItems[name]
+	if res == nil {
+		return nil, data.ErrNotFound
+	}
+
+	return res, nil
 }

src/internal/kopia/wrapper_test.go

@@ -26,7 +26,6 @@ import (
 	"github.com/alcionai/corso/src/internal/data"
 	dataMock "github.com/alcionai/corso/src/internal/data/mock"
 	"github.com/alcionai/corso/src/internal/m365/collection/drive/metadata"
-	m365Mock "github.com/alcionai/corso/src/internal/m365/mock"
 	exchMock "github.com/alcionai/corso/src/internal/m365/service/exchange/mock"
 	"github.com/alcionai/corso/src/internal/tester"
 	"github.com/alcionai/corso/src/pkg/backup/details"
@@ -1126,10 +1125,10 @@ func (suite *KopiaIntegrationSuite) TestBackupCollections_NoDetailsForMeta() {
 					streams = append(streams, ms)
 				}
 
-				mc := &m365Mock.BackupCollection{
+				mc := &dataMock.Collection{
 					Path:     storePath,
 					Loc:      locPath,
-					Streams: streams,
+					ItemData: streams,
 				}
 
 				return []data.BackupCollection{mc}
@@ -1153,10 +1152,10 @@ func (suite *KopiaIntegrationSuite) TestBackupCollections_NoDetailsForMeta() {
 					ItemInfo: details.ItemInfo{OneDrive: &info},
 				}
 
-				mc := &m365Mock.BackupCollection{
+				mc := &dataMock.Collection{
 					Path:     storePath,
 					Loc:      locPath,
-					Streams: []data.Item{ms},
+					ItemData: []data.Item{ms},
 					CState:   data.NotMovedState,
 				}
 
@@ -1296,10 +1295,10 @@ func (suite *KopiaIntegrationSuite) TestBackupCollections_ReaderError() {
 	r := NewReason(testTenant, testUser, path.ExchangeService, path.EmailCategory)
 
 	collections := []data.BackupCollection{
-		&m365Mock.BackupCollection{
+		&dataMock.Collection{
 			Path: suite.storePath1,
 			Loc:  loc1,
-			Streams: []data.Item{
+			ItemData: []data.Item{
 				&dataMock.Item{
 					ItemID:   testFileName,
 					Reader:   io.NopCloser(bytes.NewReader(testFileData)),
@@ -1312,10 +1311,10 @@ func (suite *KopiaIntegrationSuite) TestBackupCollections_ReaderError() {
 				},
 			},
 		},
-		&m365Mock.BackupCollection{
+		&dataMock.Collection{
 			Path: suite.storePath2,
 			Loc:  loc2,
-			Streams: []data.Item{
+			ItemData: []data.Item{
 				&dataMock.Item{
 					ItemID:   testFileName3,
 					Reader:   io.NopCloser(bytes.NewReader(testFileData3)),
@@ -1340,6 +1339,8 @@ func (suite *KopiaIntegrationSuite) TestBackupCollections_ReaderError() {
 		},
 	}
 
+	errs := fault.New(true)
+
 	stats, deets, _, err := suite.w.ConsumeBackupCollections(
 		suite.ctx,
 		[]identity.Reasoner{r},
@@ -1348,13 +1349,14 @@ func (suite *KopiaIntegrationSuite) TestBackupCollections_ReaderError() {
 		nil,
 		nil,
 		true,
-		fault.New(true))
+		errs)
 	require.Error(t, err, clues.ToCore(err))
-	assert.Equal(t, 0, stats.ErrorCount)
+	assert.Equal(t, 0, stats.ErrorCount, "error count")
-	assert.Equal(t, 5, stats.TotalFileCount)
+	assert.Equal(t, 5, stats.TotalFileCount, "total files")
-	assert.Equal(t, 6, stats.TotalDirectoryCount)
+	assert.Equal(t, 6, stats.TotalDirectoryCount, "total directories")
-	assert.Equal(t, 1, stats.IgnoredErrorCount)
+	assert.Equal(t, 0, stats.IgnoredErrorCount, "ignored errors")
-	assert.False(t, stats.Incomplete)
+	assert.Equal(t, 1, len(errs.Errors().Recovered), "recovered errors")
+	assert.False(t, stats.Incomplete, "incomplete")
 	// 5 file and 2 folder entries.
 	assert.Len(t, deets.Details().Entries, 5+2)
 
@@ -1373,7 +1375,7 @@ func (suite *KopiaIntegrationSuite) TestBackupCollections_ReaderError() {
 
 	require.Len(t, dcs, 1, "number of restore collections")
 
-	errs := fault.New(true)
+	errs = fault.New(true)
 	items := dcs[0].Items(suite.ctx, errs)
 
 	// Get all the items from channel
@@ -1555,11 +1557,11 @@ func (suite *KopiaSimpleRepoIntegrationSuite) SetupTest() {
 
 	for _, parent := range []path.Path{suite.testPath1, suite.testPath2} {
 		loc := path.Builder{}.Append(parent.Folders()...)
-		collection := &m365Mock.BackupCollection{Path: parent, Loc: loc}
+		collection := &dataMock.Collection{Path: parent, Loc: loc}
 
 		for _, item := range suite.files[parent.String()] {
-			collection.Streams = append(
+			collection.ItemData = append(
-				collection.Streams,
+				collection.ItemData,
 				&dataMock.Item{
 					ItemID:   item.itemPath.Item(),
 					Reader:   io.NopCloser(bytes.NewReader(item.data)),

src/internal/m365/backup.go

@@ -8,12 +8,15 @@ import (
 	"github.com/alcionai/corso/src/internal/common/prefixmatcher"
 	"github.com/alcionai/corso/src/internal/data"
 	"github.com/alcionai/corso/src/internal/diagnostics"
+	"github.com/alcionai/corso/src/internal/kopia"
+	kinject "github.com/alcionai/corso/src/internal/kopia/inject"
 	"github.com/alcionai/corso/src/internal/m365/graph"
 	"github.com/alcionai/corso/src/internal/m365/service/exchange"
 	"github.com/alcionai/corso/src/internal/m365/service/groups"
 	"github.com/alcionai/corso/src/internal/m365/service/onedrive"
 	"github.com/alcionai/corso/src/internal/m365/service/sharepoint"
 	"github.com/alcionai/corso/src/internal/operations/inject"
+	bupMD "github.com/alcionai/corso/src/pkg/backup/metadata"
 	"github.com/alcionai/corso/src/pkg/fault"
 	"github.com/alcionai/corso/src/pkg/filters"
 	"github.com/alcionai/corso/src/pkg/logger"
@@ -186,3 +189,55 @@ func verifyBackupInputs(sels selectors.Selector, cachedIDs []string) error {
 
 	return nil
 }
+
+func (ctrl *Controller) GetMetadataPaths(
+	ctx context.Context,
+	r kinject.RestoreProducer,
+	man kopia.ManifestEntry,
+	errs *fault.Bus,
+) ([]path.RestorePaths, error) {
+	var (
+		paths = []path.RestorePaths{}
+		err   error
+	)
+
+	for _, reason := range man.Reasons {
+		filePaths := [][]string{}
+
+		switch reason.Service() {
+		case path.GroupsService:
+			filePaths, err = groups.MetadataFiles(ctx, reason, r, man.ID, errs)
+			if err != nil {
+				return nil, err
+			}
+		default:
+			for _, fn := range bupMD.AllMetadataFileNames() {
+				filePaths = append(filePaths, []string{fn})
+			}
+		}
+
+		for _, fp := range filePaths {
+			pth, err := path.BuildMetadata(
+				reason.Tenant(),
+				reason.ProtectedResource(),
+				reason.Service(),
+				reason.Category(),
+				true,
+				fp...)
+			if err != nil {
+				return nil, err
+			}
+
+			dir, err := pth.Dir()
+			if err != nil {
+				return nil, clues.
+					Wrap(err, "building metadata collection path").
+					With("metadata_file", fp)
+			}
+
+			paths = append(paths, path.RestorePaths{StoragePath: pth, RestorePath: dir})
+		}
+	}
+
+	return paths, nil
+}

src/internal/m365/collection/drive/collections.go

@@ -122,10 +122,10 @@ func deserializeMetadata(
 
 				switch item.ID() {
 				case bupMD.PreviousPathFileName:
-					err = deserializeMap(item.ToReader(), prevFolders)
+					err = DeserializeMap(item.ToReader(), prevFolders)
 
 				case bupMD.DeltaURLsFileName:
-					err = deserializeMap(item.ToReader(), prevDeltas)
+					err = DeserializeMap(item.ToReader(), prevDeltas)
 
 				default:
 					logger.Ctx(ictx).Infow(
@@ -191,11 +191,11 @@ func deserializeMetadata(
 
 var errExistingMapping = clues.New("mapping already exists for same drive ID")
 
-// deserializeMap takes an reader and a map of already deserialized items and
+// DeserializeMap takes an reader and a map of already deserialized items and
 // adds the newly deserialized items to alreadyFound. Items are only added to
 // alreadyFound if none of the keys in the freshly deserialized map already
 // exist in alreadyFound. reader is closed at the end of this function.
-func deserializeMap[T any](reader io.ReadCloser, alreadyFound map[string]T) error {
+func DeserializeMap[T any](reader io.ReadCloser, alreadyFound map[string]T) error {
 	defer reader.Close()
 
 	tmp := map[string]T{}

src/internal/m365/collection/groups/export_test.go

@@ -32,8 +32,8 @@ func (suite *ExportUnitSuite) TestStreamItems() {
 		{
 			name: "no errors",
 			backingColl: dataMock.Collection{
-				ItemData: []*dataMock.Item{
+				ItemData: []data.Item{
-					{ItemID: "zim"},
+					&dataMock.Item{ItemID: "zim"},
 				},
 			},
 			expectName: "zim",
@@ -51,8 +51,8 @@ func (suite *ExportUnitSuite) TestStreamItems() {
 		{
 			name: "items and recoverable errors",
 			backingColl: dataMock.Collection{
-				ItemData: []*dataMock.Item{
+				ItemData: []data.Item{
-					{ItemID: "gir"},
+					&dataMock.Item{ItemID: "gir"},
 				},
 				ItemsRecoverableErrs: []error{
 					clues.New("I miss my cupcake."),

src/internal/m365/mock/collection.go

@@ -1,67 +0,0 @@
-package mock
-
-import (
-	"context"
-
-	"github.com/alcionai/corso/src/internal/data"
-	"github.com/alcionai/corso/src/pkg/fault"
-	"github.com/alcionai/corso/src/pkg/path"
-)
-
-type RestoreCollection struct {
-	data.Collection
-	AuxItems map[string]data.Item
-}
-
-func (rc RestoreCollection) FetchItemByName(
-	ctx context.Context,
-	name string,
-) (data.Item, error) {
-	res := rc.AuxItems[name]
-	if res == nil {
-		return nil, data.ErrNotFound
-	}
-
-	return res, nil
-}
-
-type BackupCollection struct {
-	Path    path.Path
-	Loc     *path.Builder
-	Streams []data.Item
-	CState  data.CollectionState
-}
-
-func (c *BackupCollection) Items(context.Context, *fault.Bus) <-chan data.Item {
-	res := make(chan data.Item)
-
-	go func() {
-		defer close(res)
-
-		for _, s := range c.Streams {
-			res <- s
-		}
-	}()
-
-	return res
-}
-
-func (c BackupCollection) FullPath() path.Path {
-	return c.Path
-}
-
-func (c BackupCollection) PreviousPath() path.Path {
-	return c.Path
-}
-
-func (c BackupCollection) LocationPath() *path.Builder {
-	return c.Loc
-}
-
-func (c BackupCollection) State() data.CollectionState {
-	return c.CState
-}
-
-func (c BackupCollection) DoNotMergeItems() bool {
-	return false
-}

src/internal/m365/mock/connector.go

@@ -3,9 +3,13 @@ package mock
 import (
 	"context"
 
+	"github.com/alcionai/clues"
+
 	"github.com/alcionai/corso/src/internal/common/idname"
 	"github.com/alcionai/corso/src/internal/common/prefixmatcher"
 	"github.com/alcionai/corso/src/internal/data"
+	"github.com/alcionai/corso/src/internal/kopia"
+	kinject "github.com/alcionai/corso/src/internal/kopia/inject"
 	"github.com/alcionai/corso/src/internal/operations/inject"
 	"github.com/alcionai/corso/src/pkg/backup/details"
 	"github.com/alcionai/corso/src/pkg/control"
@@ -46,6 +50,15 @@ func (ctrl Controller) ProduceBackupCollections(
 	return ctrl.Collections, ctrl.Exclude, ctrl.Err == nil, ctrl.Err
 }
 
+func (ctrl *Controller) GetMetadataPaths(
+	ctx context.Context,
+	r kinject.RestoreProducer,
+	man kopia.ManifestEntry,
+	errs *fault.Bus,
+) ([]path.RestorePaths, error) {
+	return nil, clues.New("not implemented")
+}
+
 func (ctrl Controller) IsServiceEnabled(
 	_ context.Context,
 	_ path.ServiceType,

src/internal/m365/service/groups/backup.go

@@ -4,12 +4,14 @@ import (
 	"context"
 
 	"github.com/alcionai/clues"
+	"github.com/kopia/kopia/repo/manifest"
 	"golang.org/x/exp/slices"
 
 	"github.com/alcionai/corso/src/internal/common/idname"
 	"github.com/alcionai/corso/src/internal/common/prefixmatcher"
 	"github.com/alcionai/corso/src/internal/common/ptr"
 	"github.com/alcionai/corso/src/internal/data"
+	kinject "github.com/alcionai/corso/src/internal/kopia/inject"
 	"github.com/alcionai/corso/src/internal/m365/collection/drive"
 	"github.com/alcionai/corso/src/internal/m365/collection/groups"
 	"github.com/alcionai/corso/src/internal/m365/collection/site"
@@ -19,6 +21,7 @@ import (
 	"github.com/alcionai/corso/src/internal/observe"
 	"github.com/alcionai/corso/src/internal/operations/inject"
 	"github.com/alcionai/corso/src/pkg/account"
+	"github.com/alcionai/corso/src/pkg/backup/identity"
 	"github.com/alcionai/corso/src/pkg/backup/metadata"
 	"github.com/alcionai/corso/src/pkg/fault"
 	"github.com/alcionai/corso/src/pkg/logger"
@@ -96,12 +99,21 @@ func ProduceBackupCollections(
 				return nil, nil, false, err
 			}
 
+			siteMetadataCollection := map[string][]data.RestoreCollection{}
+
+			// Once we have metadata collections for chat as well, we will have to filter those out
+			for _, c := range bpc.MetadataCollections {
+				siteID := c.FullPath().Elements().Last()
+				siteMetadataCollection[siteID] = append(siteMetadataCollection[siteID], c)
+			}
+
 			pr := idname.NewProvider(ptr.Val(resp.GetId()), ptr.Val(resp.GetName()))
 			sbpc := inject.BackupProducerConfig{
 				LastBackupVersion:   bpc.LastBackupVersion,
 				Options:             bpc.Options,
 				ProtectedResource:   pr,
 				Selector:            bpc.Selector,
+				MetadataCollections: siteMetadataCollection[ptr.Val(resp.GetId())],
 			}
 
 			bh := drive.NewGroupBackupHandler(
@@ -211,3 +223,125 @@ func getSitesMetadataCollection(
 
 	return md, err
 }
+
+func MetadataFiles(
+	ctx context.Context,
+	reason identity.Reasoner,
+	r kinject.RestoreProducer,
+	manID manifest.ID,
+	errs *fault.Bus,
+) ([][]string, error) {
+	pth, err := path.BuildMetadata(
+		reason.Tenant(),
+		reason.ProtectedResource(),
+		reason.Service(),
+		reason.Category(),
+		true,
+		odConsts.SitesPathDir,
+		metadata.PreviousPathFileName)
+	if err != nil {
+		return nil, err
+	}
+
+	dir, err := pth.Dir()
+	if err != nil {
+		return nil, clues.Wrap(err, "building metadata collection path")
+	}
+
+	dcs, err := r.ProduceRestoreCollections(
+		ctx,
+		string(manID),
+		[]path.RestorePaths{{StoragePath: pth, RestorePath: dir}},
+		nil,
+		errs)
+	if err != nil {
+		return nil, err
+	}
+
+	sites, err := deserializeSiteMetadata(ctx, dcs)
+	if err != nil {
+		return nil, err
+	}
+
+	filePaths := [][]string{}
+
+	for k := range sites {
+		for _, fn := range metadata.AllMetadataFileNames() {
+			filePaths = append(filePaths, []string{odConsts.SitesPathDir, k, fn})
+		}
+	}
+
+	return filePaths, nil
+}
+
+func deserializeSiteMetadata(
+	ctx context.Context,
+	cols []data.RestoreCollection,
+) (map[string]string, error) {
+	logger.Ctx(ctx).Infow(
+		"deserializing previous sites metadata",
+		"num_collections", len(cols))
+
+	var (
+		prevFolders = map[string]string{}
+		errs        = fault.New(true) // metadata item reads should not fail backup
+	)
+
+	for _, col := range cols {
+		if errs.Failure() != nil {
+			break
+		}
+
+		items := col.Items(ctx, errs)
+
+		for breakLoop := false; !breakLoop; {
+			select {
+			case <-ctx.Done():
+				return nil, clues.Wrap(
+					ctx.Err(),
+					"deserializing previous sites metadata").WithClues(ctx)
+
+			case item, ok := <-items:
+				if !ok {
+					breakLoop = true
+					break
+				}
+
+				var (
+					err  error
+					ictx = clues.Add(ctx, "item_uuid", item.ID())
+				)
+
+				switch item.ID() {
+				case metadata.PreviousPathFileName:
+					err = drive.DeserializeMap(item.ToReader(), prevFolders)
+
+				default:
+					logger.Ctx(ictx).Infow(
+						"skipping unknown metadata file",
+						"file_name", item.ID())
+
+					continue
+				}
+
+				if err == nil {
+					// Successful decode.
+					continue
+				}
+
+				if err != nil {
+					return nil, clues.Stack(err).WithClues(ictx)
+				}
+			}
+		}
+	}
+
+	// if reads from items failed, return empty but no error
+	if errs.Failure() != nil {
+		logger.CtxErr(ctx, errs.Failure()).Info("reading metadata collection items")
+
+		return map[string]string{}, nil
+	}
+
+	return prevFolders, nil
+}

src/internal/m365/service/groups/backup_test.go

@@ -0,0 +1,145 @@
+package groups
+
+import (
+	"context"
+	"io"
+	"strings"
+	"testing"
+
+	"github.com/kopia/kopia/repo/manifest"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/stretchr/testify/suite"
+
+	"github.com/alcionai/corso/src/internal/data"
+	"github.com/alcionai/corso/src/internal/kopia"
+	"github.com/alcionai/corso/src/internal/kopia/inject"
+	"github.com/alcionai/corso/src/internal/tester"
+	"github.com/alcionai/corso/src/pkg/backup/identity"
+	"github.com/alcionai/corso/src/pkg/fault"
+	"github.com/alcionai/corso/src/pkg/path"
+)
+
+type GroupsBackupUnitSuite struct {
+	tester.Suite
+}
+
+func TestGroupsBackupUnitSuite(t *testing.T) {
+	suite.Run(t, &GroupsBackupUnitSuite{Suite: tester.NewUnitSuite(t)})
+}
+
+type mockRestoreProducer struct {
+	rc  []data.RestoreCollection
+	err error
+}
+
+func (mr mockRestoreProducer) ProduceRestoreCollections(
+	ctx context.Context,
+	snapshotID string,
+	paths []path.RestorePaths,
+	bc kopia.ByteCounter,
+	errs *fault.Bus,
+) ([]data.RestoreCollection, error) {
+	return mr.rc, mr.err
+}
+
+type mockCollection struct {
+	items []mockItem
+}
+
+type mockItem struct {
+	name string
+	data string
+}
+
+func (mi mockItem) ToReader() io.ReadCloser { return io.NopCloser(strings.NewReader(mi.data)) }
+func (mi mockItem) ID() string              { return mi.name }
+func (mi mockItem) Deleted() bool           { return false }
+
+func (mc mockCollection) Items(ctx context.Context, errs *fault.Bus) <-chan data.Item {
+	ch := make(chan data.Item)
+
+	go func() {
+		defer close(ch)
+
+		for _, item := range mc.items {
+			ch <- item
+		}
+	}()
+
+	return ch
+}
+func (mc mockCollection) FullPath() path.Path { panic("unimplemented") }
+func (mc mockCollection) FetchItemByName(ctx context.Context, name string) (data.Item, error) {
+	panic("unimplemented")
+}
+
+func (suite *GroupsBackupUnitSuite) TestMetadataFiles() {
+	tests := []struct {
+		name      string
+		reason    identity.Reasoner
+		r         inject.RestoreProducer
+		manID     manifest.ID
+		result    [][]string
+		expectErr require.ErrorAssertionFunc
+	}{
+		{
+			name:      "error",
+			reason:    kopia.NewReason("tenant", "user", path.GroupsService, path.LibrariesCategory),
+			manID:     "manifestID",
+			r:         mockRestoreProducer{err: assert.AnError},
+			expectErr: require.Error,
+		},
+		{
+			name:   "single site",
+			reason: kopia.NewReason("tenant", "user", path.GroupsService, path.LibrariesCategory),
+			manID:  "manifestID",
+			r: mockRestoreProducer{
+				rc: []data.RestoreCollection{
+					mockCollection{
+						items: []mockItem{
+							{name: "previouspath", data: `{"id1": "path/to/id1"}`},
+						},
+					},
+				},
+			},
+			result:    [][]string{{"sites", "id1", "delta"}, {"sites", "id1", "previouspath"}},
+			expectErr: require.NoError,
+		},
+		{
+			name:   "multiple sites",
+			reason: kopia.NewReason("tenant", "user", path.GroupsService, path.LibrariesCategory),
+			manID:  "manifestID",
+			r: mockRestoreProducer{
+				rc: []data.RestoreCollection{
+					mockCollection{
+						items: []mockItem{
+							{name: "previouspath", data: `{"id1": "path/to/id1", "id2": "path/to/id2"}`},
+						},
+					},
+				},
+			},
+			result: [][]string{
+				{"sites", "id1", "delta"},
+				{"sites", "id1", "previouspath"},
+				{"sites", "id2", "delta"},
+				{"sites", "id2", "previouspath"},
+			},
+			expectErr: require.NoError,
+		},
+	}
+
+	for _, test := range tests {
+		suite.Run(test.name, func() {
+			t := suite.T()
+
+			ctx, flush := tester.NewContext(t)
+			defer flush()
+
+			res, err := MetadataFiles(ctx, test.reason, test.r, test.manID, fault.New(true))
+
+			test.expectErr(t, err)
+			assert.ElementsMatch(t, test.result, res)
+		})
+	}
+}

src/internal/m365/service/groups/export_test.go

@@ -77,8 +77,8 @@ func (suite *ExportUnitSuite) TestExportRestoreCollections() {
 		data.FetchRestoreCollection{
 			Collection: dataMock.Collection{
 				Path: p,
-				ItemData: []*dataMock.Item{
+				ItemData: []data.Item{
-					{
+					&dataMock.Item{
 						ItemID:   itemID,
 						Reader:   io.NopCloser(bytes.NewBufferString("body1")),
 						ItemInfo: dii,

src/internal/m365/service/onedrive/export_test.go

@@ -62,8 +62,8 @@ func (suite *ExportUnitSuite) TestGetItems() {
 			version: 1,
 			backingCollection: data.NoFetchRestoreCollection{
 				Collection: dataMock.Collection{
-					ItemData: []*dataMock.Item{
+					ItemData: []data.Item{
-						{
+						&dataMock.Item{
 							ItemID: "name1",
 							Reader: io.NopCloser(bytes.NewBufferString("body1")),
 						},
@@ -83,12 +83,12 @@ func (suite *ExportUnitSuite) TestGetItems() {
 			version: 1,
 			backingCollection: data.NoFetchRestoreCollection{
 				Collection: dataMock.Collection{
-					ItemData: []*dataMock.Item{
+					ItemData: []data.Item{
-						{
+						&dataMock.Item{
 							ItemID: "name1",
 							Reader: io.NopCloser(bytes.NewBufferString("body1")),
 						},
-						{
+						&dataMock.Item{
 							ItemID: "name2",
 							Reader: io.NopCloser(bytes.NewBufferString("body2")),
 						},
@@ -113,8 +113,8 @@ func (suite *ExportUnitSuite) TestGetItems() {
 			version: 2,
 			backingCollection: data.NoFetchRestoreCollection{
 				Collection: dataMock.Collection{
-					ItemData: []*dataMock.Item{
+					ItemData: []data.Item{
-						{
+						&dataMock.Item{
 							ItemID: "name1.data",
 							Reader: io.NopCloser(bytes.NewBufferString("body1")),
 						},
@@ -134,8 +134,8 @@ func (suite *ExportUnitSuite) TestGetItems() {
 			version: version.Backup,
 			backingCollection: data.FetchRestoreCollection{
 				Collection: dataMock.Collection{
-					ItemData: []*dataMock.Item{
+					ItemData: []data.Item{
-						{
+						&dataMock.Item{
 							ItemID: "id1.data",
 							Reader: io.NopCloser(bytes.NewBufferString("body1")),
 						},
@@ -156,8 +156,8 @@ func (suite *ExportUnitSuite) TestGetItems() {
 			version: version.Backup,
 			backingCollection: data.FetchRestoreCollection{
 				Collection: dataMock.Collection{
-					ItemData: []*dataMock.Item{
+					ItemData: []data.Item{
-						{ItemID: "id1.data"},
+						&dataMock.Item{ItemID: "id1.data"},
 					},
 				},
 				FetchItemByNamer: finD{err: assert.AnError},
@@ -174,11 +174,11 @@ func (suite *ExportUnitSuite) TestGetItems() {
 			version: version.Backup,
 			backingCollection: data.FetchRestoreCollection{
 				Collection: dataMock.Collection{
-					ItemData: []*dataMock.Item{
+					ItemData: []data.Item{
-						{
+						&dataMock.Item{
 							ItemID: "missing.data",
 						},
-						{
+						&dataMock.Item{
 							ItemID: "id1.data",
 							Reader: io.NopCloser(bytes.NewBufferString("body1")),
 						},
@@ -203,16 +203,16 @@ func (suite *ExportUnitSuite) TestGetItems() {
 			version: version.OneDrive1DataAndMetaFiles,
 			backingCollection: data.FetchRestoreCollection{
 				Collection: dataMock.Collection{
-					ItemData: []*dataMock.Item{
+					ItemData: []data.Item{
-						{
+						&dataMock.Item{
 							ItemID: "name0",
 							Reader: io.NopCloser(bytes.NewBufferString("body0")),
 						},
-						{
+						&dataMock.Item{
 							ItemID:  "name1",
 							ReadErr: assert.AnError,
 						},
-						{
+						&dataMock.Item{
 							ItemID: "name2",
 							Reader: io.NopCloser(bytes.NewBufferString("body2")),
 						},
@@ -300,8 +300,8 @@ func (suite *ExportUnitSuite) TestExportRestoreCollections() {
 		data.FetchRestoreCollection{
 			Collection: dataMock.Collection{
 				Path: p,
-				ItemData: []*dataMock.Item{
+				ItemData: []data.Item{
-					{
+					&dataMock.Item{
 						ItemID:   "id1.data",
 						Reader:   io.NopCloser(bytes.NewBufferString("body1")),
 						ItemInfo: dii,

src/internal/m365/service/sharepoint/export_test.go

@@ -85,8 +85,8 @@ func (suite *ExportUnitSuite) TestExportRestoreCollections() {
 		data.FetchRestoreCollection{
 			Collection: dataMock.Collection{
 				Path: p,
-				ItemData: []*dataMock.Item{
+				ItemData: []data.Item{
-					{
+					&dataMock.Item{
 						ItemID:   "id1.data",
 						Reader:   io.NopCloser(bytes.NewBufferString("body1")),
 						ItemInfo: dii,

src/internal/m365/stub/stub.go

@@ -9,7 +9,6 @@ import (
 	"github.com/alcionai/corso/src/internal/data"
 	dataMock "github.com/alcionai/corso/src/internal/data/mock"
 	"github.com/alcionai/corso/src/internal/m365/collection/drive/metadata"
-	"github.com/alcionai/corso/src/internal/m365/mock"
 	exchMock "github.com/alcionai/corso/src/internal/m365/service/exchange/mock"
 	"github.com/alcionai/corso/src/pkg/control"
 	"github.com/alcionai/corso/src/pkg/path"
@@ -137,7 +136,7 @@ func CollectionsForInfo(
 			totalItems++
 		}
 
-		c := mock.RestoreCollection{
+		c := dataMock.RestoreCollection{
 			Collection: mc,
 			AuxItems:   map[string]data.Item{},
 		}

src/internal/operations/backup.go

@@ -356,6 +356,7 @@ func (op *BackupOperation) do(
 	mans, mdColls, canUseMetadata, err := produceManifestsAndMetadata(
 		ctx,
 		kbf,
+		op.bp,
 		op.kopia,
 		reasons, fallbackReasons,
 		op.account.ID(),

src/internal/operations/backup_test.go

@@ -27,6 +27,7 @@ import (
 	"github.com/alcionai/corso/src/internal/m365/support"
 	"github.com/alcionai/corso/src/internal/model"
 	"github.com/alcionai/corso/src/internal/operations/inject"
+	opMock "github.com/alcionai/corso/src/internal/operations/inject/mock"
 	"github.com/alcionai/corso/src/internal/streamstore"
 	ssmock "github.com/alcionai/corso/src/internal/streamstore/mock"
 	"github.com/alcionai/corso/src/internal/tester"
@@ -1553,38 +1554,6 @@ func (suite *AssistBackupIntegrationSuite) TearDownSuite() {
 	}
 }
 
-var _ inject.BackupProducer = &mockBackupProducer{}
-
-type mockBackupProducer struct {
-	colls                   []data.BackupCollection
-	dcs                     data.CollectionStats
-	injectNonRecoverableErr bool
-}
-
-func (mbp *mockBackupProducer) ProduceBackupCollections(
-	context.Context,
-	inject.BackupProducerConfig,
-	*fault.Bus,
-) ([]data.BackupCollection, prefixmatcher.StringSetReader, bool, error) {
-	if mbp.injectNonRecoverableErr {
-		return nil, nil, false, clues.New("non-recoverable error")
-	}
-
-	return mbp.colls, nil, true, nil
-}
-
-func (mbp *mockBackupProducer) IsServiceEnabled(
-	context.Context,
-	path.ServiceType,
-	string,
-) (bool, error) {
-	return true, nil
-}
-
-func (mbp *mockBackupProducer) Wait() *data.CollectionStats {
-	return &mbp.dcs
-}
-
 func makeBackupCollection(
 	p path.Path,
 	locPath *path.Builder,
@@ -1596,10 +1565,10 @@ func makeBackupCollection(
 		streams[i] = &items[i]
 	}
 
-	return &mock.BackupCollection{
+	return &dataMock.Collection{
 		Path:     p,
 		Loc:      locPath,
-		Streams: streams,
+		ItemData: streams,
 	}
 }
 
@@ -1878,10 +1847,7 @@ func (suite *AssistBackupIntegrationSuite) TestBackupTypesForFailureModes() {
 			require.NoError(t, err, clues.ToCore(err))
 
 			cs = append(cs, mc)
-			bp := &mockBackupProducer{
+			bp := opMock.NewMockBackupProducer(cs, data.CollectionStats{}, test.injectNonRecoverableErr)
-				colls:                   cs,
-				injectNonRecoverableErr: test.injectNonRecoverableErr,
-			}
 
 			opts.FailureHandling = test.failurePolicy
 
@@ -1890,7 +1856,7 @@ func (suite *AssistBackupIntegrationSuite) TestBackupTypesForFailureModes() {
 				opts,
 				suite.kw,
 				suite.sw,
-				bp,
+				&bp,
 				acct,
 				osel.Selector,
 				selectors.Selector{DiscreteOwner: userID},
@@ -2196,9 +2162,7 @@ func (suite *AssistBackupIntegrationSuite) TestExtensionsIncrementals() {
 			require.NoError(t, err, clues.ToCore(err))
 
 			cs = append(cs, mc)
-			bp := &mockBackupProducer{
+			bp := opMock.NewMockBackupProducer(cs, data.CollectionStats{}, false)
-				colls: cs,
-			}
 
 			opts.FailureHandling = failurePolicy
 
@@ -2207,7 +2171,7 @@ func (suite *AssistBackupIntegrationSuite) TestExtensionsIncrementals() {
 				opts,
 				suite.kw,
 				suite.sw,
-				bp,
+				&bp,
 				acct,
 				osel.Selector,
 				selectors.Selector{DiscreteOwner: userID},

src/internal/operations/inject/inject.go

@@ -6,6 +6,8 @@ import (
 	"github.com/alcionai/corso/src/internal/common/idname"
 	"github.com/alcionai/corso/src/internal/common/prefixmatcher"
 	"github.com/alcionai/corso/src/internal/data"
+	"github.com/alcionai/corso/src/internal/kopia"
+	"github.com/alcionai/corso/src/internal/kopia/inject"
 	"github.com/alcionai/corso/src/pkg/backup/details"
 	"github.com/alcionai/corso/src/pkg/control"
 	"github.com/alcionai/corso/src/pkg/control/repository"
@@ -26,6 +28,19 @@ type (
 
 		IsServiceEnableder
 
+		// GetMetadataPaths returns a list of paths that form metadata
+		// collections. In case of service that have just a single
+		// underlying service like OneDrive or SharePoint, it will mostly
+		// just have a single collection per manifest reason, but in the
+		// case of groups, it will contain a collection each for the
+		// underlying service, for example one per SharePoint site.
+		GetMetadataPaths(
+			ctx context.Context,
+			r inject.RestoreProducer,
+			man kopia.ManifestEntry,
+			errs *fault.Bus,
+		) ([]path.RestorePaths, error)
+
 		Wait() *data.CollectionStats
 	}
 

src/internal/operations/inject/mock/inject.go

@@ -0,0 +1,70 @@
+package mock
+
+import (
+	"context"
+
+	"github.com/alcionai/clues"
+
+	"github.com/alcionai/corso/src/internal/common/prefixmatcher"
+	"github.com/alcionai/corso/src/internal/data"
+	"github.com/alcionai/corso/src/internal/kopia"
+	kinject "github.com/alcionai/corso/src/internal/kopia/inject"
+	"github.com/alcionai/corso/src/internal/m365"
+	"github.com/alcionai/corso/src/internal/operations/inject"
+	"github.com/alcionai/corso/src/pkg/fault"
+	"github.com/alcionai/corso/src/pkg/path"
+)
+
+var _ inject.BackupProducer = &mockBackupProducer{}
+
+type mockBackupProducer struct {
+	colls                   []data.BackupCollection
+	dcs                     data.CollectionStats
+	injectNonRecoverableErr bool
+}
+
+func NewMockBackupProducer(
+	colls []data.BackupCollection,
+	dcs data.CollectionStats,
+	injectNonRecoverableErr bool,
+) mockBackupProducer {
+	return mockBackupProducer{
+		colls:                   colls,
+		dcs:                     dcs,
+		injectNonRecoverableErr: injectNonRecoverableErr,
+	}
+}
+
+func (mbp *mockBackupProducer) ProduceBackupCollections(
+	context.Context,
+	inject.BackupProducerConfig,
+	*fault.Bus,
+) ([]data.BackupCollection, prefixmatcher.StringSetReader, bool, error) {
+	if mbp.injectNonRecoverableErr {
+		return nil, nil, false, clues.New("non-recoverable error")
+	}
+
+	return mbp.colls, nil, true, nil
+}
+
+func (mbp *mockBackupProducer) IsServiceEnabled(
+	context.Context,
+	path.ServiceType,
+	string,
+) (bool, error) {
+	return true, nil
+}
+
+func (mbp *mockBackupProducer) Wait() *data.CollectionStats {
+	return &mbp.dcs
+}
+
+func (mbp mockBackupProducer) GetMetadataPaths(
+	ctx context.Context,
+	r kinject.RestoreProducer,
+	man kopia.ManifestEntry,
+	errs *fault.Bus,
+) ([]path.RestorePaths, error) {
+	ctrl := m365.Controller{}
+	return ctrl.GetMetadataPaths(ctx, r, man, errs)
+}

src/internal/operations/manifests.go

@@ -9,16 +9,16 @@ import (
 	"github.com/alcionai/corso/src/internal/data"
 	"github.com/alcionai/corso/src/internal/kopia"
 	"github.com/alcionai/corso/src/internal/kopia/inject"
+	oinject "github.com/alcionai/corso/src/internal/operations/inject"
 	"github.com/alcionai/corso/src/pkg/backup/identity"
-	"github.com/alcionai/corso/src/pkg/backup/metadata"
 	"github.com/alcionai/corso/src/pkg/fault"
 	"github.com/alcionai/corso/src/pkg/logger"
-	"github.com/alcionai/corso/src/pkg/path"
 )
 
 func produceManifestsAndMetadata(
 	ctx context.Context,
 	bf inject.BaseFinder,
+	bp oinject.BackupProducer,
 	rp inject.RestoreProducer,
 	reasons, fallbackReasons []identity.Reasoner,
 	tenantID string,
@@ -27,6 +27,7 @@ func produceManifestsAndMetadata(
 	bb, meta, useMergeBases, err := getManifestsAndMetadata(
 		ctx,
 		bf,
+		bp,
 		rp,
 		reasons,
 		fallbackReasons,
@@ -56,6 +57,7 @@ func produceManifestsAndMetadata(
 func getManifestsAndMetadata(
 	ctx context.Context,
 	bf inject.BaseFinder,
+	bp oinject.BackupProducer,
 	rp inject.RestoreProducer,
 	reasons, fallbackReasons []identity.Reasoner,
 	tenantID string,
@@ -63,7 +65,6 @@ func getManifestsAndMetadata(
 ) (kopia.BackupBases, []data.RestoreCollection, bool, error) {
 	var (
 		tags        = map[string]string{kopia.TagBackupCategory: ""}
-		metadataFiles = metadata.AllMetadataFileNames()
 		collections []data.RestoreCollection
 	)
 
@@ -102,8 +103,19 @@ func getManifestsAndMetadata(
 		// spread around.  Need to find more idiomatic handling.
 		fb := fault.New(true)
 
-		colls, err := collectMetadata(mctx, rp, man, metadataFiles, tenantID, fb)
+		paths, err := bp.GetMetadataPaths(mctx, rp, man, fb)
+		if err != nil {
+			LogFaultErrors(ctx, fb.Errors(), "collecting metadata paths")
+			return nil, nil, false, err
+		}
+
+		colls, err := rp.ProduceRestoreCollections(ctx, string(man.ID), paths, nil, fb)
+		if err != nil {
+			// Restore is best-effort and we want to keep it that way since we want to
+			// return as much metadata as we can to reduce the work we'll need to do.
+			// Just wrap the error here for better reporting/debugging.
 			LogFaultErrors(ctx, fb.Errors(), "collecting metadata")
+		}
 
 		// TODO(ashmrtn): It should be alright to relax this condition a little. We
 		// should be able to just remove the offending manifest and backup from the
@@ -127,51 +139,3 @@ func getManifestsAndMetadata(
 
 	return bb, collections, true, nil
 }
-
-// collectMetadata retrieves all metadata files associated with the manifest.
-func collectMetadata(
-	ctx context.Context,
-	r inject.RestoreProducer,
-	man kopia.ManifestEntry,
-	fileNames []string,
-	tenantID string,
-	errs *fault.Bus,
-) ([]data.RestoreCollection, error) {
-	paths := []path.RestorePaths{}
-
-	for _, fn := range fileNames {
-		for _, reason := range man.Reasons {
-			p, err := path.BuildMetadata(
-				tenantID,
-				reason.ProtectedResource(),
-				reason.Service(),
-				reason.Category(),
-				true,
-				fn)
-			if err != nil {
-				return nil, clues.
-					Wrap(err, "building metadata path").
-					With("metadata_file", fn, "category", reason.Category)
-			}
-
-			dir, err := p.Dir()
-			if err != nil {
-				return nil, clues.
-					Wrap(err, "building metadata collection path").
-					With("metadata_file", fn, "category", reason.Category)
-			}
-
-			paths = append(paths, path.RestorePaths{StoragePath: p, RestorePath: dir})
-		}
-	}
-
-	dcs, err := r.ProduceRestoreCollections(ctx, string(man.ID), paths, nil, errs)
-	if err != nil {
-		// Restore is best-effort and we want to keep it that way since we want to
-		// return as much metadata as we can to reduce the work we'll need to do.
-		// Just wrap the error here for better reporting/debugging.
-		return dcs, clues.Wrap(err, "collecting prior metadata")
-	}
-
-	return dcs, nil
-}

src/internal/operations/manifests_test.go

@@ -12,7 +12,9 @@ import (
 
 	"github.com/alcionai/corso/src/internal/data"
 	"github.com/alcionai/corso/src/internal/kopia"
+	"github.com/alcionai/corso/src/internal/m365"
 	"github.com/alcionai/corso/src/internal/model"
+	"github.com/alcionai/corso/src/internal/operations/inject/mock"
 	"github.com/alcionai/corso/src/internal/tester"
 	"github.com/alcionai/corso/src/pkg/backup"
 	"github.com/alcionai/corso/src/pkg/backup/identity"
@@ -79,7 +81,7 @@ func TestOperationsManifestsUnitSuite(t *testing.T) {
 	suite.Run(t, &OperationsManifestsUnitSuite{Suite: tester.NewUnitSuite(t)})
 }
 
-func (suite *OperationsManifestsUnitSuite) TestCollectMetadata() {
+func (suite *OperationsManifestsUnitSuite) TestGetMetadataPaths() {
 	const (
 		ro  = "owner"
 		tid = "tenantid"
@@ -104,13 +106,12 @@ func (suite *OperationsManifestsUnitSuite) TestCollectMetadata() {
 		name        string
 		manID       string
 		reasons     []identity.Reasoner
-		fileNames   []string
 		expectPaths func(*testing.T, []string) []path.Path
 		expectErr   error
 	}{
 		{
-			name:  "single reason, single file",
+			name:  "single reason",
-			manID: "single single",
+			manID: "single",
 			reasons: []identity.Reasoner{
 				kopia.NewReason(tid, ro, path.ExchangeService, path.EmailCategory),
 			},
@@ -125,30 +126,10 @@ func (suite *OperationsManifestsUnitSuite) TestCollectMetadata() {
 
 				return ps
 			},
-			fileNames: []string{"a"},
 		},
 		{
-			name:  "single reason, multiple files",
+			name:  "multiple reasons",
-			manID: "single multi",
+			manID: "multi",
-			reasons: []identity.Reasoner{
-				kopia.NewReason(tid, ro, path.ExchangeService, path.EmailCategory),
-			},
-			expectPaths: func(t *testing.T, files []string) []path.Path {
-				ps := make([]path.Path, 0, len(files))
-
-				for _, f := range files {
-					p, err := emailPath.AppendItem(f)
-					assert.NoError(t, err, clues.ToCore(err))
-					ps = append(ps, p)
-				}
-
-				return ps
-			},
-			fileNames: []string{"a", "b"},
-		},
-		{
-			name:  "multiple reasons, single file",
-			manID: "multi single",
 			reasons: []identity.Reasoner{
 				kopia.NewReason(tid, ro, path.ExchangeService, path.EmailCategory),
 				kopia.NewReason(tid, ro, path.ExchangeService, path.ContactsCategory),
@@ -167,30 +148,6 @@ func (suite *OperationsManifestsUnitSuite) TestCollectMetadata() {
 
 				return ps
 			},
-			fileNames: []string{"a"},
-		},
-		{
-			name:  "multiple reasons, multiple file",
-			manID: "multi multi",
-			reasons: []identity.Reasoner{
-				kopia.NewReason(tid, ro, path.ExchangeService, path.EmailCategory),
-				kopia.NewReason(tid, ro, path.ExchangeService, path.ContactsCategory),
-			},
-			expectPaths: func(t *testing.T, files []string) []path.Path {
-				ps := make([]path.Path, 0, len(files))
-
-				for _, f := range files {
-					p, err := emailPath.AppendItem(f)
-					assert.NoError(t, err, clues.ToCore(err))
-					ps = append(ps, p)
-					p, err = contactPath.AppendItem(f)
-					assert.NoError(t, err, clues.ToCore(err))
-					ps = append(ps, p)
-				}
-
-				return ps
-			},
-			fileNames: []string{"a", "b"},
 		},
 	}
 	for _, test := range table {
@@ -200,7 +157,7 @@ func (suite *OperationsManifestsUnitSuite) TestCollectMetadata() {
 			ctx, flush := tester.NewContext(t)
 			defer flush()
 
-			paths := test.expectPaths(t, test.fileNames)
+			paths := test.expectPaths(t, []string{"delta", "previouspath"})
 
 			mr := mockRestoreProducer{err: test.expectErr}
 			mr.buildRestoreFunc(t, test.manID, paths)
@@ -210,13 +167,15 @@ func (suite *OperationsManifestsUnitSuite) TestCollectMetadata() {
 				Reasons:  test.reasons,
 			}
 
-			_, err := collectMetadata(ctx, &mr, man, test.fileNames, tid, fault.New(true))
+			controller := m365.Controller{}
+			_, err := controller.GetMetadataPaths(ctx, &mr, man, fault.New(true))
 			assert.ErrorIs(t, err, test.expectErr, clues.ToCore(err))
 		})
 	}
 }
 
 func buildReasons(
+	tenant string,
 	ro string,
 	service path.ServiceType,
 	cats ...path.CategoryType,
@@ -226,7 +185,7 @@ func buildReasons(
 	for _, cat := range cats {
 		reasons = append(
 			reasons,
-			kopia.NewReason("", ro, service, cat))
+			kopia.NewReason(tenant, ro, service, cat))
 	}
 
 	return reasons
@@ -245,7 +204,7 @@ func (suite *OperationsManifestsUnitSuite) TestProduceManifestsAndMetadata() {
 				ID:               manifest.ID(id),
 				IncompleteReason: incmpl,
 			},
-			Reasons: buildReasons(ro, path.ExchangeService, cats...),
+			Reasons: buildReasons(tid, ro, path.ExchangeService, cats...),
 		}
 	}
 
@@ -258,7 +217,7 @@ func (suite *OperationsManifestsUnitSuite) TestProduceManifestsAndMetadata() {
 				SnapshotID:    snapID,
 				StreamStoreID: snapID + "store",
 			},
-			Reasons: buildReasons(ro, path.ExchangeService, cats...),
+			Reasons: buildReasons(tid, ro, path.ExchangeService, cats...),
 		}
 	}
 
@@ -477,9 +436,11 @@ func (suite *OperationsManifestsUnitSuite) TestProduceManifestsAndMetadata() {
 			ctx, flush := tester.NewContext(t)
 			defer flush()
 
+			emptyMockBackpuProducer := mock.NewMockBackupProducer(nil, data.CollectionStats{}, false)
 			mans, dcs, b, err := produceManifestsAndMetadata(
 				ctx,
 				test.bf,
+				&emptyMockBackpuProducer,
 				&test.rp,
 				test.reasons, nil,
 				tid,
@@ -545,7 +506,7 @@ func (suite *OperationsManifestsUnitSuite) TestProduceManifestsAndMetadata_Fallb
 				IncompleteReason: incmpl,
 				Tags:             map[string]string{"tag:" + kopia.TagBackupID: id + "bup"},
 			},
-			Reasons: buildReasons(ro, path.ExchangeService, cats...),
+			Reasons: buildReasons(tid, ro, path.ExchangeService, cats...),
 		}
 	}
 
@@ -558,7 +519,7 @@ func (suite *OperationsManifestsUnitSuite) TestProduceManifestsAndMetadata_Fallb
 				SnapshotID:    snapID,
 				StreamStoreID: snapID + "store",
 			},
-			Reasons: buildReasons(ro, path.ExchangeService, cats...),
+			Reasons: buildReasons(tid, ro, path.ExchangeService, cats...),
 		}
 	}
 
@@ -929,9 +890,11 @@ func (suite *OperationsManifestsUnitSuite) TestProduceManifestsAndMetadata_Fallb
 			ctx, flush := tester.NewContext(t)
 			defer flush()
 
+			mbp := mock.NewMockBackupProducer(nil, data.CollectionStats{}, false)
 			mans, dcs, b, err := produceManifestsAndMetadata(
 				ctx,
 				test.bf,
+				&mbp,
 				&test.rp,
 				test.reasons, test.fallbackReasons,
 				tid,

src/pkg/path/path_test.go

@@ -489,3 +489,68 @@ func (suite *PathUnitSuite) TestBuildPrefix() {
 		})
 	}
 }
+
+func (suite *PathUnitSuite) TestBuildRestorePaths() {
+	type args struct {
+		tenantID          string
+		protectedResource string
+		service           ServiceType
+		category          CategoryType
+		fp                []string
+	}
+
+	tests := []struct {
+		name        string
+		args        args
+		restorePath string
+		storagePath string
+		expectErr   require.ErrorAssertionFunc
+	}{
+		{
+			name: "single",
+			args: args{
+				tenantID:          "tenant",
+				protectedResource: "protectedResource",
+				service:           GroupsService,
+				category:          LibrariesCategory,
+				fp:                []string{"a"},
+			},
+			restorePath: "tenant/groupsMetadata/protectedResource/libraries",
+			storagePath: "tenant/groupsMetadata/protectedResource/libraries/a",
+			expectErr:   require.NoError,
+		},
+		{
+			name: "multi",
+			args: args{
+				tenantID:          "tenant",
+				protectedResource: "protectedResource",
+				service:           GroupsService,
+				category:          LibrariesCategory,
+				fp:                []string{"a", "b"},
+			},
+			restorePath: "tenant/groupsMetadata/protectedResource/libraries/a",
+			storagePath: "tenant/groupsMetadata/protectedResource/libraries/a/b",
+			expectErr:   require.NoError,
+		},
+	}
+	for _, test := range tests {
+		suite.Run(test.name, func() {
+			t := suite.T()
+
+			r, err := BuildMetadata(
+				test.args.tenantID,
+				test.args.protectedResource,
+				test.args.service,
+				test.args.category,
+				true,
+				test.args.fp...)
+			test.expectErr(t, err, clues.ToCore(err))
+
+			rdir, err := r.Dir()
+			require.NoError(t, err, clues.ToCore(err))
+
+			assert.Equal(t, test.restorePath, rdir.String(), "restore path")
+			assert.Equal(t, test.storagePath, r.String(), "storage path")
+		})
+	}
+}