sigs.k8s.io/cluster-api@v1.7.1/cmd/clusterctl/client/alpha/rollout_rollbacker.go (about)

     1  /*
     2  Copyright 2020 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package alpha
    18  
    19  import (
    20  	"context"
    21  
    22  	"github.com/pkg/errors"
    23  	corev1 "k8s.io/api/core/v1"
    24  
    25  	clusterv1 "sigs.k8s.io/cluster-api/api/v1beta1"
    26  	"sigs.k8s.io/cluster-api/cmd/clusterctl/client/cluster"
    27  	logf "sigs.k8s.io/cluster-api/cmd/clusterctl/log"
    28  	"sigs.k8s.io/cluster-api/util/patch"
    29  )
    30  
    31  // ObjectRollbacker will issue a rollback on the specified cluster-api resource.
    32  func (r *rollout) ObjectRollbacker(ctx context.Context, proxy cluster.Proxy, ref corev1.ObjectReference, toRevision int64) error {
    33  	switch ref.Kind {
    34  	case MachineDeployment:
    35  		deployment, err := getMachineDeployment(ctx, proxy, ref.Name, ref.Namespace)
    36  		if err != nil || deployment == nil {
    37  			return errors.Wrapf(err, "failed to get %v/%v", ref.Kind, ref.Name)
    38  		}
    39  		if deployment.Spec.Paused {
    40  			return errors.Errorf("can't rollback a paused MachineDeployment: please run 'clusterctl rollout resume %v/%v' first", ref.Kind, ref.Name)
    41  		}
    42  		if err := rollbackMachineDeployment(ctx, proxy, deployment, toRevision); err != nil {
    43  			return err
    44  		}
    45  	default:
    46  		return errors.Errorf("invalid resource type %q, valid values are %v", ref.Kind, validRollbackResourceTypes)
    47  	}
    48  	return nil
    49  }
    50  
    51  // rollbackMachineDeployment will rollback to a previous MachineSet revision used by this MachineDeployment.
    52  func rollbackMachineDeployment(ctx context.Context, proxy cluster.Proxy, md *clusterv1.MachineDeployment, toRevision int64) error {
    53  	log := logf.Log
    54  	c, err := proxy.NewClient(ctx)
    55  	if err != nil {
    56  		return err
    57  	}
    58  
    59  	if toRevision < 0 {
    60  		return errors.Errorf("revision number cannot be negative: %v", toRevision)
    61  	}
    62  	msList, err := getMachineSetsForDeployment(ctx, proxy, md)
    63  	if err != nil {
    64  		return err
    65  	}
    66  	log.V(7).Info("Found MachineSets", "count", len(msList))
    67  	msForRevision, err := findMachineDeploymentRevision(toRevision, msList)
    68  	if err != nil {
    69  		return err
    70  	}
    71  	log.V(7).Info("Found revision", "revision", msForRevision)
    72  	patchHelper, err := patch.NewHelper(md, c)
    73  	if err != nil {
    74  		return err
    75  	}
    76  	// Copy template into the machinedeployment (excluding the hash)
    77  	revMSTemplate := *msForRevision.Spec.Template.DeepCopy()
    78  	delete(revMSTemplate.Labels, clusterv1.MachineDeploymentUniqueLabel)
    79  
    80  	md.Spec.Template = revMSTemplate
    81  	return patchHelper.Patch(ctx, md)
    82  }