asset/machines: add manifests for MachineConfig

Provide the means by which a machines asset can add MachineConfig manifests.
This is needed so that the ignition configs can be supplemented for machine pools for example have hyperthreading disabled, include
authorized_keys for user.

pkg/asset/machines/machineconfig/manifest.go

@@ -0,0 +1,63 @@
+package machineconfig
+
+import (
+ "fmt"
+ "os"
+ "path/filepath"
+
+ "github.com/ghodss/yaml"
+
+ mcfgv1 "github.com/openshift/machine-config-operator/pkg/apis/machineconfiguration.openshift.io/v1"
+
+ "github.com/openshift/installer/pkg/asset"
+)
+
+const (
+ machineConfigFileName = "99_openshift-machineconfig_%s.yaml"
+)
+
+var (
+ machineConfigFileNamePattern = fmt.Sprintf(machineConfigFileName, "*")
+)
+
+// Manifests creates manifest files containing the MachineConfigs.
+func Manifests(configs []*mcfgv1.MachineConfig, role, directory string) ([]*asset.File, error) {
+ data := []byte{}
+ for _, c := range configs {
+ if c == nil {
+ continue
+ }
+ configData, err := yaml.Marshal(c)
+ if err != nil {
+ return nil, err
+ }
+ data = append(data, []byte("---\n")...)
+ data = append(data, configData...)
+ }
+ if len(data) == 0 {
+ return nil, nil
+ }
+ return []*asset.File{
+ {
+ Filename: filepath.Join(directory, fmt.Sprintf(machineConfigFileName, role)),
+ Data: data,
+ },
+ }, nil
+}
+
+// IsManifest tests whether the specified filename is a MachineConfig manifest.
+func IsManifest(role, filename string) bool {
+ return fmt.Sprintf(machineConfigFileName, role) == filename
+}
+
+// Load loads the MachineConfig manifests.
+func Load(f asset.FileFetcher, role, directory string) ([]*asset.File, error) {
+ file, err := f.FetchByName(filepath.Join(directory, fmt.Sprintf(machineConfigFileName, role)))
+ if err != nil {
+ if os.IsNotExist(err) {
+ return nil, nil
+ }
+ return nil, err
+ }
+ return []*asset.File{file}, nil
+}