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managedfile.go
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managedfile.go
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/*
Copyright 2019 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package fitasks
import (
"bytes"
"fmt"
"os"
"k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/kops/pkg/acls"
"k8s.io/kops/upup/pkg/fi"
)
//go:generate fitask -type=ManagedFile
type ManagedFile struct {
Name *string
Lifecycle *fi.Lifecycle
Location *string
Contents *fi.ResourceHolder
}
func (e *ManagedFile) Find(c *fi.Context) (*ManagedFile, error) {
managedFiles := c.ClusterConfigBase
location := fi.StringValue(e.Location)
if location == "" {
return nil, nil
}
existingData, err := managedFiles.Join(location).ReadFile()
if err != nil {
if os.IsNotExist(err) {
return nil, nil
}
return nil, err
}
actual := &ManagedFile{
Name: e.Name,
Location: e.Location,
Contents: fi.WrapResource(fi.NewBytesResource(existingData)),
}
// Avoid spurious changes
actual.Lifecycle = e.Lifecycle
return actual, nil
}
func (e *ManagedFile) Run(c *fi.Context) error {
return fi.DefaultDeltaRunMethod(e, c)
}
func (s *ManagedFile) CheckChanges(a, e, changes *ManagedFile) error {
if a != nil {
if changes.Name != nil {
return fi.CannotChangeField("Name")
}
}
if e.Contents == nil {
return field.Required(field.NewPath("Contents"), "")
}
return nil
}
func (_ *ManagedFile) Render(c *fi.Context, a, e, changes *ManagedFile) error {
location := fi.StringValue(e.Location)
if location == "" {
return fi.RequiredField("Location")
}
data, err := e.Contents.AsBytes()
if err != nil {
return fmt.Errorf("error reading contents of ManagedFile: %v", err)
}
p := c.ClusterConfigBase.Join(location)
acl, err := acls.GetACL(p, c.Cluster)
if err != nil {
return err
}
err = p.WriteFile(bytes.NewReader(data), acl)
if err != nil {
return fmt.Errorf("error creating ManagedFile %q: %v", location, err)
}
return nil
}