Bump github.com/containers/storage from 1.21.0 to 1.21.1

Bumps [github.com/containers/storage](https://github.com/containers/storage) from 1.21.0 to 1.21.1.
- [Release notes](https://github.com/containers/storage/releases)
- [Changelog](https://github.com/containers/storage/blob/master/docs/containers-storage-changes.md)
- [Commits](https://github.com/containers/storage/compare/v1.21.0...v1.21.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/containers/common v0.15.2
 	github.com/containers/image/v5 v5.5.1
 	github.com/containers/ocicrypt v1.0.3
-	github.com/containers/storage v1.21.0
+	github.com/containers/storage v1.21.1
 	github.com/docker/distribution v2.7.1+incompatible
 	github.com/docker/docker v1.4.2-0.20191219165747-a9416c67da9f
 	github.com/dsnet/compress v0.0.1 // indirect

go.sum

@@ -50,8 +50,8 @@ github.com/containers/ocicrypt v1.0.3 h1:vYgl+RZ9Q3DPMuTfxmN+qp0X2Bj52uuY2vnt6Gz
 github.com/containers/ocicrypt v1.0.3/go.mod h1:CUBa+8MRNL/VkpxYIpaMtgn1WgXGyvPQj8jcy0EVG6g=
 github.com/containers/storage v1.20.2 h1:tw/uKRPDnmVrluIzer3dawTFG/bTJLP8IEUyHFhltYk=
 github.com/containers/storage v1.20.2/go.mod h1:oOB9Ie8OVPojvoaKWEGSEtHbXUAs+tSyr7RO7ZGteMc=
-github.com/containers/storage v1.21.0 h1:9VpsAmqwA9P+xQZc2sWZ3sj5NQojvg47P6orW34nYFU=
-github.com/containers/storage v1.21.0/go.mod h1:I1EIAA7B4OwWRSA0b4yq2AW1wjvvfcY0zLWQuwTa4zw=
+github.com/containers/storage v1.21.1 h1:FGA2c7+0Bn8ndrlrj+HHmKeVjFD3yVhvYa0gijsrg1M=
+github.com/containers/storage v1.21.1/go.mod h1:I1EIAA7B4OwWRSA0b4yq2AW1wjvvfcY0zLWQuwTa4zw=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=

vendor/github.com/containers/storage/VERSION

@@ -1 +1 @@
-1.21.0
+1.21.1

vendor/github.com/containers/storage/drivers/overlay/overlay.go

@@ -892,19 +892,6 @@ func (d *Driver) get(id string, disableShifting bool, options graphdriver.MountO
 		}
 	}
 
-	// If the lowers list is still empty, use an empty lower so that we can still force an
-	// SELinux context for the mount.
-
-	// if we are doing a readOnly mount, and there is only one lower
-	// We should just return the lower directory, no reason to mount.
-	if !readWrite && d.options.mountProgram == "" {
-		if len(absLowers) == 0 {
-			return path.Join(dir, "empty"), nil
-		}
-		if len(absLowers) == 1 {
-			return absLowers[0], nil
-		}
-	}
 	if len(absLowers) == 0 {
 		absLowers = append(absLowers, path.Join(dir, "empty"))
 		relLowers = append(relLowers, path.Join(id, "empty"))

vendor/github.com/containers/storage/layers.go

@@ -772,7 +772,20 @@ func (r *layerStore) Mounted(id string) (int, error) {
 }
 
 func (r *layerStore) Mount(id string, options drivers.MountOpts) (string, error) {
-	if !r.IsReadWrite() {
+
+	// check whether options include ro option
+	hasReadOnlyOpt := func(opts []string) bool {
+		for _, item := range opts {
+			if item == "ro" {
+				return true
+			}
+		}
+		return false
+	}
+
+	// You are not allowed to mount layers from readonly stores if they
+	// are not mounted read/only.
+	if !r.IsReadWrite() && !hasReadOnlyOpt(options.Options) {
 		return "", errors.Wrapf(ErrStoreIsReadOnly, "not allowed to update mount locations for layers at %q", r.mountspath())
 	}
 	r.mountsLockfile.Lock()
@@ -1000,6 +1013,7 @@ func (r *layerStore) deleteInternal(id string) error {
 		if layer.MountPoint != "" {
 			delete(r.bymount, layer.MountPoint)
 		}
+		r.deleteInDigestMap(id)
 		toDeleteIndex := -1
 		for i, candidate := range r.layers {
 			if candidate.ID == id {
@@ -1031,6 +1045,27 @@ func (r *layerStore) deleteInternal(id string) error {
 	return err
 }
 
+func (r *layerStore) deleteInDigestMap(id string) {
+	for digest, layers := range r.bycompressedsum {
+		for i, layerID := range layers {
+			if layerID == id {
+				layers = append(layers[:i], layers[i+1:]...)
+				r.bycompressedsum[digest] = layers
+				break
+			}
+		}
+	}
+	for digest, layers := range r.byuncompressedsum {
+		for i, layerID := range layers {
+			if layerID == id {
+				layers = append(layers[:i], layers[i+1:]...)
+				r.byuncompressedsum[digest] = layers
+				break
+			}
+		}
+	}
+}
+
 func (r *layerStore) Delete(id string) error {
 	layer, ok := r.lookup(id)
 	if !ok {

vendor/github.com/containers/storage/userns.go

@@ -229,7 +229,7 @@ func subtractHostIDs(avail idtools.IDMap, used idtools.IDMap) []idtools.IDMap {
 	case used.HostID <= avail.HostID && used.HostID+used.Size >= avail.HostID+avail.Size:
 		return nil
 	case used.HostID <= avail.HostID && used.HostID+used.Size > avail.HostID && used.HostID+used.Size < avail.HostID+avail.Size:
-		newContainerID := used.HostID + used.Size
+		newContainerID := avail.ContainerID + used.Size
 		newHostID := used.HostID + used.Size
 		r := idtools.IDMap{
 			ContainerID: newContainerID,
@@ -275,7 +275,7 @@ func subtractContainerIDs(avail idtools.IDMap, used idtools.IDMap) []idtools.IDM
 		return nil
 	case used.ContainerID <= avail.ContainerID && used.ContainerID+used.Size > avail.ContainerID && used.ContainerID+used.Size < avail.ContainerID+avail.Size:
 		newContainerID := used.ContainerID + used.Size
-		newHostID := used.HostID + used.Size
+		newHostID := avail.HostID + used.Size
 		r := idtools.IDMap{
 			ContainerID: newContainerID,
 			HostID:      newHostID,
@@ -297,7 +297,7 @@ func subtractContainerIDs(avail idtools.IDMap, used idtools.IDMap) []idtools.IDM
 		}
 		r2 := idtools.IDMap{
 			ContainerID: used.ContainerID + used.Size,
-			HostID:      used.HostID + used.Size,
+			HostID:      avail.HostID + used.Size,
 			Size:        avail.ContainerID + avail.Size - used.ContainerID - used.Size,
 		}
 		return []idtools.IDMap{r1, r2}

vendor/modules.txt

@@ -91,7 +91,7 @@ github.com/containers/ocicrypt/keywrap/pgp
 github.com/containers/ocicrypt/keywrap/pkcs7
 github.com/containers/ocicrypt/spec
 github.com/containers/ocicrypt/utils
-# github.com/containers/storage v1.21.0
+# github.com/containers/storage v1.21.1
 github.com/containers/storage
 github.com/containers/storage/drivers
 github.com/containers/storage/drivers/aufs