Fix etag changing only once a second

changelog/unreleased/fix-etag-changing-only-every-second.md

@@ -0,0 +1,6 @@
+Bugfix: Fix etag changing only once a second
+
+We fixed a problem with the owncloud storage driver only considering
+the mtime with a second resolution for the etag calculation.
+
+https://github.com/cs3org/reva/pull/1576

pkg/storage/fs/owncloud/owncloud_unix.go

@@ -43,7 +43,7 @@ import (
 func calcEtag(ctx context.Context, fi os.FileInfo) string {
 	log := appctx.GetLogger(ctx)
 	h := md5.New()
-	err := binary.Write(h, binary.BigEndian, fi.ModTime().Unix())
+	err := binary.Write(h, binary.BigEndian, fi.ModTime().UnixNano())
 	if err != nil {
 		log.Error().Err(err).Msg("error writing mtime")
 	}

pkg/storage/fs/owncloud/owncloud_windows.go

@@ -40,7 +40,7 @@ import (
 func calcEtag(ctx context.Context, fi os.FileInfo) string {
 	log := appctx.GetLogger(ctx)
 	h := md5.New()
-	err := binary.Write(h, binary.BigEndian, fi.ModTime().Unix())
+	err := binary.Write(h, binary.BigEndian, fi.ModTime().UnixNano())
 	if err != nil {
 		log.Error().Err(err).Msg("error writing mtime")
 	}

pkg/storage/utils/decomposedfs/node/node_test.go

@@ -19,6 +19,8 @@
 package node_test
 
 import (
+	"time"
+
 	userpb "github.com/cs3org/go-cs3apis/cs3/identity/user/v1beta1"
 	"github.com/cs3org/reva/pkg/storage/utils/decomposedfs/node"
 	helpers "github.com/cs3org/reva/pkg/storage/utils/decomposedfs/testhelpers"
@@ -147,4 +149,38 @@ var _ = Describe("Node", func() {
 			Expect(child.Blobsize).To(Equal(int64(1234)))
 		})
 	})
+
+	Describe("AsResourceInfo", func() {
+		var (
+			n *node.Node
+		)
+
+		BeforeEach(func() {
+			var err error
+			n, err = env.Lookup.NodeFromPath(env.Ctx, "dir1/file1")
+			Expect(err).ToNot(HaveOccurred())
+		})
+
+		Describe("the Etag field", func() {
+			It("is set", func() {
+				ri, err := n.AsResourceInfo(env.Ctx, node.OwnerPermissions, []string{})
+				Expect(err).ToNot(HaveOccurred())
+				Expect(len(ri.Etag)).To(Equal(34))
+			})
+
+			It("changes when the tmtime is set", func() {
+				ri, err := n.AsResourceInfo(env.Ctx, node.OwnerPermissions, []string{})
+				Expect(err).ToNot(HaveOccurred())
+				Expect(len(ri.Etag)).To(Equal(34))
+				before := ri.Etag
+
+				Expect(n.SetTMTime(time.Now().UTC())).To(Succeed())
+
+				ri, err = n.AsResourceInfo(env.Ctx, node.OwnerPermissions, []string{})
+				Expect(err).ToNot(HaveOccurred())
+				Expect(len(ri.Etag)).To(Equal(34))
+				Expect(ri.Etag).ToNot(Equal(before))
+			})
+		})
+	})
 })

pkg/storage/utils/decomposedfs/tree/tree_test.go

@@ -208,6 +208,23 @@ var _ = Describe("Tree", func() {
 			Expect(err).ToNot(HaveOccurred())
 		})
 
+		Describe("with TreeTimeAccounting enabled", func() {
+			It("sets the tmtime of the parent", func() {
+				file, err := env.CreateTestFile("file1", "", 1, dir.ID)
+				Expect(err).ToNot(HaveOccurred())
+
+				riBefore, err := dir.AsResourceInfo(env.Ctx, node.OwnerPermissions, []string{})
+				Expect(err).ToNot(HaveOccurred())
+
+				err = env.Tree.Propagate(env.Ctx, file)
+				Expect(err).ToNot(HaveOccurred())
+
+				riAfter, err := dir.AsResourceInfo(env.Ctx, node.OwnerPermissions, []string{})
+				Expect(err).ToNot(HaveOccurred())
+				Expect(riAfter.Etag).ToNot(Equal(riBefore.Etag))
+			})
+		})
+
 		Describe("with TreeSizeAccounting enabled", func() {
 			It("calculates the size", func() {
 				file, err := env.CreateTestFile("file1", "", 1, dir.ID)