forked from kubernetes/kops
/
managedfile.go
75 lines (62 loc) · 1.53 KB
/
managedfile.go
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package fitasks
import (
"fmt"
"k8s.io/kops/upup/pkg/fi"
"k8s.io/kubernetes/pkg/util/validation/field"
"os"
)
//go:generate fitask -type=ManagedFile
type ManagedFile struct {
Name *string
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)),
}
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)
}
err = c.ClusterConfigBase.Join(location).WriteFile(data)
if err != nil {
return fmt.Errorf("error creating ManagedFile %q: %v", location, err)
}
return nil
}