Heal backend configuration file (#6532)

Fixes #6461

cmd/admin-heal-ops.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"path"
 	"runtime"
 	"strings"
 	"sync"
@@ -521,6 +522,9 @@ func (h *healSequence) traverseAndHeal() {
 	// Start with format healing
 	checkErr(h.healDiskFormat)
 
+	// Start healing the config.
+	checkErr(h.healConfig)
+
 	// Heal buckets and objects
 	checkErr(h.healBuckets)
 
@@ -531,6 +535,29 @@ func (h *healSequence) traverseAndHeal() {
 	close(h.traverseAndHealDoneCh)
 }
 
+// healConfig - heals config.json, retrun value indicates if a failure occurred.
+func (h *healSequence) healConfig() error {
+	// Get current object layer instance.
+	objectAPI := newObjectLayerFn()
+	if objectAPI == nil {
+		return errServerNotInitialized
+	}
+
+	configFile := path.Join(minioConfigPrefix, minioConfigFile)
+	configBackupFile := path.Join(minioConfigPrefix, minioConfigBackupFile)
+	for _, cfg := range []string{configFile, configBackupFile} {
+		res, err := objectAPI.HealObject(h.ctx, minioMetaBucket, cfg, h.settings.DryRun)
+		if err != nil {
+			return err
+		}
+		res.Type = madmin.HealItemBucketMetadata
+		if err = h.pushHealResultItem(res); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 // healDiskFormat - heals format.json, return value indicates if a
 // failure error occurred.
 func (h *healSequence) healDiskFormat() error {

cmd/xl-v1-healing.go

@@ -205,10 +205,6 @@ func healBucketMetadata(xl xlObjects, bucket string, dryRun bool) (
 		reqInfo := &logger.ReqInfo{BucketName: bucket}
 		ctx := logger.SetReqInfo(context.Background(), reqInfo)
 		result, healErr := xl.HealObject(ctx, minioMetaBucket, metaPath, dryRun)
-		// If object is not found, no result to add.
-		if isErrObjectNotFound(healErr) {
-			return nil
-		}
 		if healErr != nil {
 			return healErr
 		}
@@ -608,6 +604,12 @@ func (xl xlObjects) healObjectDir(ctx context.Context, bucket, object string, dr
 // and later the disk comes back up again, heal on the object
 // should delete it.
 func (xl xlObjects) HealObject(ctx context.Context, bucket, object string, dryRun bool) (hr madmin.HealResultItem, err error) {
+	defer func() {
+		// If object is not found, ignore the error.
+		if isErrObjectNotFound(err) {
+			err = nil
+		}
+	}()
 
 	// Create context that also contains information about the object and bucket.
 	// The top level handler might not have this information.