Replicate Expiry ILM configs while site replication (#18130)

Signed-off-by: Shubhendu Ram Tripathi <shubhendu@minio.io>

cmd/bucket-metadata-sys.go

@@ -19,6 +19,7 @@ package cmd
 
 import (
 	"context"
+	"encoding/xml"
 	"errors"
 	"fmt"
 	"sync"
@@ -177,6 +178,40 @@ func (sys *BucketMetadataSys) save(ctx context.Context, meta BucketMetadata) err
 // Delete delete the bucket metadata for the specified bucket.
 // must be used by all callers instead of using Update() with nil configData.
 func (sys *BucketMetadataSys) Delete(ctx context.Context, bucket string, configFile string) (updatedAt time.Time, err error) {
+	if configFile == bucketLifecycleConfig {
+		// Get bucket config from current site
+		meta, e := globalBucketMetadataSys.GetConfigFromDisk(ctx, bucket)
+		if e != nil && !errors.Is(e, errConfigNotFound) {
+			return updatedAt, e
+		}
+		var expiryRuleRemoved bool
+		if len(meta.LifecycleConfigXML) > 0 {
+			var lcCfg lifecycle.Lifecycle
+			if err := xml.Unmarshal(meta.LifecycleConfigXML, &lcCfg); err != nil {
+				return updatedAt, err
+			}
+			// find a single expiry rule set the flag
+			for _, rl := range lcCfg.Rules {
+				if !rl.Expiration.IsNull() || !rl.NoncurrentVersionExpiration.IsNull() {
+					expiryRuleRemoved = true
+					break
+				}
+			}
+		}
+
+		// Form empty ILM details with `ExpiryUpdatedAt` field and save
+		var cfgData []byte
+		if expiryRuleRemoved {
+			var lcCfg lifecycle.Lifecycle
+			currtime := time.Now()
+			lcCfg.ExpiryUpdatedAt = &currtime
+			cfgData, err = xml.Marshal(lcCfg)
+			if err != nil {
+				return updatedAt, err
+			}
+		}
+		return sys.updateAndParse(ctx, bucket, configFile, cfgData, false)
+	}
 	return sys.updateAndParse(ctx, bucket, configFile, nil, false)
 }
 
@@ -267,7 +302,10 @@ func (sys *BucketMetadataSys) GetLifecycleConfig(bucket string) (*lifecycle.Life
 		}
 		return nil, time.Time{}, err
 	}
-	if meta.lifecycleConfig == nil {
+	// there could be just `ExpiryUpdatedAt` field populated as part
+	// of last delete all. Treat this situation as not lifecycle configuration
+	// available
+	if meta.lifecycleConfig == nil || len(meta.lifecycleConfig.Rules) == 0 {
 		return nil, time.Time{}, BucketLifecycleNotFound{Bucket: bucket}
 	}
 	return meta.lifecycleConfig, meta.LifecycleConfigUpdatedAt, nil