Minor tweaks

Signed-off-by: Matt Lord <mattalord@gmail.com>

go/vt/vtctl/workflow/framework_test.go

@@ -578,6 +578,13 @@ func (tmc *testTMClient) UpdateVReplicationWorkflow(ctx context.Context, tablet
 	}, nil
 }
 
+func (tmc *testTMClient) ValidateVReplicationPermissions(ctx context.Context, tablet *topodatapb.Tablet, req *tabletmanagerdatapb.ValidateVReplicationPermissionsRequest) (*tabletmanagerdatapb.ValidateVReplicationPermissionsResponse, error) {
+	return &tabletmanagerdatapb.ValidateVReplicationPermissionsResponse{
+		User: "vt_filtered",
+		Ok:   true,
+	}, nil
+}
+
 func (tmc *testTMClient) setPrimaryPosition(tablet *topodatapb.Tablet, position string) {
 	tmc.mu.Lock()
 	defer tmc.mu.Unlock()

go/vt/vtctl/workflow/utils.go

@@ -666,23 +666,21 @@ func areTabletsAvailableToStreamFrom(ctx context.Context, req *vtctldatapb.Workf
 				allErrors.RecordError(fmt.Errorf("no tablet found to source data in keyspace %s, shard %s", keyspace, shard.ShardName()))
 				return
 			}
-			if req.GetEnableReverseReplication() {
-				// Ensure the tablet has the minimum privileges required on the sidecar database
-				// table in order to manage the reverse workflow as part of the traffic switch.
-				for _, tablet := range tablets {
-					wg.Add(1)
-					go func() {
-						defer wg.Done()
-						res, err := ts.ws.tmc.ValidateVReplicationPermissions(ctx, tablet.Tablet, nil)
-						if err != nil {
-							allErrors.RecordError(vterrors.Wrapf(err, "failed to validate required vreplication metadata permissions on tablet %s", topoproto.TabletAliasString(tablet.Alias)))
-						}
-						if !res.GetOk() {
-							allErrors.RecordError(fmt.Errorf("user %s does not have the required set of permissions (insert,update,delete) on the %s.vreplication table on tablet %s",
-								res.GetUser(), sidecar.GetIdentifier(), topoproto.TabletAliasString(tablet.Alias)))
-						}
-					}()
-				}
+			// Ensure the tablet has the minimum privileges required on the sidecar database
+			// table in order to manage the reverse workflow as part of the traffic switch.
+			for _, tablet := range tablets {
+				wg.Add(1)
+				go func() {
+					defer wg.Done()
+					res, err := ts.ws.tmc.ValidateVReplicationPermissions(ctx, tablet.Tablet, nil)
+					if err != nil {
+						allErrors.RecordError(vterrors.Wrapf(err, "failed to validate required vreplication metadata permissions on tablet %s", topoproto.TabletAliasString(tablet.Alias)))
+					}
+					if !res.GetOk() {
+						allErrors.RecordError(fmt.Errorf("user %s does not have the required set of permissions (insert,update,delete) on the %s.vreplication table on tablet %s",
+							res.GetUser(), sidecar.GetIdentifier(), topoproto.TabletAliasString(tablet.Alias)))
+					}
+				}()
 			}
 		}(cells, keyspace, shard)
 	}

go/vt/vttablet/tabletmanager/rpc_vreplication.go

@@ -62,20 +62,22 @@ const (
 	// Check if workflow is still copying.
 	sqlGetVReplicationCopyStatus = "select distinct vrepl_id from %s.copy_state where vrepl_id = %d"
 	// Validate the minimum set of permissions needed to manage vreplication metadata.
+	// This is a simple check for a matching user rather than any specific user@host
+	// combination.
 	sqlValidateVReplicationPermissions = `
 select if(count(*)>0, 1, 0) as good from mysql.user as u
   left join mysql.db as d on (u.user = d.user)
   left join mysql.tables_priv as t on (u.user = t.user)
 where u.user = %a
   and (
-    (u.insert_priv = 'y' and u.update_priv = 'y' and u.delete_priv = 'y')
-    or (d.db = %a and u.insert_priv = 'y' and u.update_priv = 'y' and u.delete_priv = 'y')
-    or (t.db = %a and t.table_name = 'vreplication'
+    (u.insert_priv = 'y' and u.update_priv = 'y' and u.delete_priv = 'y') /* user has global privs */
+    or (d.db = %a and u.insert_priv = 'y' and u.update_priv = 'y' and u.delete_priv = 'y') /* user has db privs */
+    or (t.db = %a and t.table_name = 'vreplication' /* user has table privs */
       and find_in_set('insert', t.table_priv)
       and find_in_set('update', t.table_priv)
       and find_in_set('delete', t.table_priv)
     )
-  )
+  ) limit 1
 `
 )
 
@@ -549,7 +551,7 @@ func (tm *TabletManager) UpdateVReplicationWorkflows(ctx context.Context, req *t
 
 // ValidateVReplicationPermissions validates that the --db_filtered_user has
 // the minimum permissions required on the sidecardb vreplication table
-// needed in order to manager vreplication metadata.
+// needed in order to manage vreplication metadata.
 func (tm *TabletManager) ValidateVReplicationPermissions(ctx context.Context, req *tabletmanagerdatapb.ValidateVReplicationPermissionsRequest) (*tabletmanagerdatapb.ValidateVReplicationPermissionsResponse, error) {
 	query, err := sqlparser.ParseAndBind(sqlValidateVReplicationPermissions,
 		sqltypes.StringBindVariable(tm.DBConfigs.Filtered.User),
@@ -573,8 +575,9 @@ func (tm *TabletManager) ValidateVReplicationPermissions(ctx context.Context, re
 			query, qr)
 	}
 	val, err := qr.Rows[0][0].ToBool()
-	if err != nil {
-		return nil, err
+	if err != nil { // Should never happen
+		return nil, vterrors.Errorf(vtrpcpb.Code_INTERNAL, "unexpected result for query %s: expected boolean-like value, got: %q",
+			query, qr.Rows[0][0].ToString())
 	}
 	return &tabletmanagerdatapb.ValidateVReplicationPermissionsResponse{
 		User: tm.DBConfigs.Filtered.User,