add "cluster compare" command and add 1st check (unsync indices) (#2)

cmd/cluster.go

@@ -0,0 +1,78 @@
+/*
+Copyright © 2026 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+package cmd
+
+import (
+	"context"
+	"errors"
+
+	"codeberg.org/scip/esctl/pkg/cfg"
+	"codeberg.org/scip/esctl/pkg/es"
+
+	"github.com/urfave/cli/v3"
+)
+
+func Cluster(conf *cfg.Config) *cli.Command {
+	return &cli.Command{
+		Name:    "cluster",
+		Aliases: []string{"c"},
+		Usage:   "manage cluster[s]",
+
+		Commands: []*cli.Command{
+			Compare(conf),
+		},
+	}
+}
+
+func Compare(conf *cfg.Config) *cli.Command {
+	return &cli.Command{
+		Name:    "compare",
+		Aliases: []string{"c"},
+		Usage:   "compare cluster[s] (yaml config with 2 clusters required)",
+
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:        "exclude",
+				Usage:       "regexp of indicies to exclude",
+				Destination: &conf.Exclude,
+				Aliases:     []string{"e"},
+			},
+		},
+
+		Action: func(ctx context.Context, cmd *cli.Command) error {
+			leader := cmd.Args().Get(0)
+			follower := cmd.Args().Get(1)
+
+			if leader == "" || follower == "" {
+				return errors.New("no leader and follower aliases specified")
+			}
+
+			_, hasLeader := conf.Clusters[leader]
+			_, hasFollower := conf.Clusters[follower]
+
+			if !hasLeader || !hasFollower {
+				return errors.New("either leader or follower alias not configured")
+			}
+
+			if err := es.ClusterCompare(conf, leader, follower); err != nil {
+				return err
+			}
+
+			return nil
+		},
+	}
+}

cmd/root.go

@@ -76,11 +76,12 @@ func Main() int {
 			Search(conf),
 			Index(conf),
 			Snapshot(conf),
+			Cluster(conf),
 		},
 
 		Before: func(ctx context.Context, cmd *cli.Command) (context.Context, error) {
 			if err := conf.Init(); err != nil {
-				Finish(err)
+				return nil, err
 			}
 
 			log.Init(conf)