onedrive: skip writing permissions with 'owner' role

The 'owner' role is an implicit role that can't be removed, so don't try to.

backend/onedrive/metadata.go

@@ -396,7 +396,7 @@ func (m *Metadata) sortPermissions() (add, update, remove []*api.PermissionsType
 		if n.ID != "" {
 			// sanity check: ensure there's a matching "old" id with a non-matching role
 			if !slices.ContainsFunc(old, func(o *api.PermissionsType) bool {
-				return o.ID == n.ID && slices.Compare(o.Roles, n.Roles) != 0 && len(o.Roles) > 0 && len(n.Roles) > 0
+				return o.ID == n.ID && slices.Compare(o.Roles, n.Roles) != 0 && len(o.Roles) > 0 && len(n.Roles) > 0 && !slices.Contains(o.Roles, api.OwnerRole)
 			}) {
 				fs.Debugf(m.remote, "skipping update for invalid roles: %v (perm ID: %v)", n.Roles, n.ID)
 				continue
@@ -418,6 +418,10 @@ func (m *Metadata) sortPermissions() (add, update, remove []*api.PermissionsType
 		}
 	}
 	for _, o := range old {
+		if slices.Contains(o.Roles, api.OwnerRole) {
+			fs.Debugf(m.remote, "skipping remove permission -- can't remove 'owner' role")
+			continue
+		}
 		newHasOld := slices.ContainsFunc(new, func(n *api.PermissionsType) bool {
 			if n == nil || n.ID == "" {
 				return false // can't remove perms without an ID

backend/onedrive/metadata.md

@@ -109,7 +109,8 @@ To update an existing permission, include both the Permission ID and the new
 `roles` to be assigned. `roles` is the only property that can be changed.
 
 To remove permissions, pass in a blob containing only the permissions you wish
-to keep (which can be empty, to remove all.)
+to keep (which can be empty, to remove all.) Note that the `owner` role will be
+ignored, as it cannot be removed.
 
 Note that both reading and writing permissions requires extra API calls, so if
 you don't need to read or write permissions it is recommended to omit