github.com/banzaicloud/operator-tools@v0.28.10/pkg/reconciler/patch.go (about)

     1  // Copyright © 2020 Banzai Cloud
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //    http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package reconciler
    16  
    17  import (
    18  	"encoding/json"
    19  
    20  	"emperror.dev/errors"
    21  
    22  	"github.com/banzaicloud/k8s-objectmatcher/patch"
    23  )
    24  
    25  func IgnoreManagedFields() patch.CalculateOption {
    26  	return func(current, modified []byte) ([]byte, []byte, error) {
    27  		current, err := deleteManagedFields(current)
    28  		if err != nil {
    29  			return []byte{}, []byte{}, errors.WrapIf(err, "could not delete managed fields from modified byte sequence")
    30  		}
    31  
    32  		modified, err = deleteManagedFields(modified)
    33  		if err != nil {
    34  			return []byte{}, []byte{}, errors.WrapIf(err, "could not delete managed fields from modified byte sequence")
    35  		}
    36  
    37  		return current, modified, nil
    38  	}
    39  }
    40  
    41  func deleteManagedFields(obj []byte) ([]byte, error) {
    42  	var objectMap map[string]interface{}
    43  	err := json.Unmarshal(obj, &objectMap)
    44  	if err != nil {
    45  		return []byte{}, errors.WrapIf(err, "could not unmarshal byte sequence")
    46  	}
    47  	if metadata, ok := objectMap["metadata"].(map[string]interface{}); ok {
    48  		delete(metadata, "managedFields")
    49  		objectMap["metadata"] = metadata
    50  	}
    51  	obj, err = json.Marshal(objectMap)
    52  	if err != nil {
    53  		return []byte{}, errors.WrapIf(err, "could not marshal byte sequence")
    54  	}
    55  
    56  	return obj, nil
    57  }