Add single-stack IPv6 support

docs/release-notes.md

@@ -11,6 +11,7 @@ nav_order: 9
 ### Features
 
 - Support partitioning disk with mounted partitions
+- upport IPv6 for single-stack OpenStack
 
 ### Changes
 

internal/providers/openstack/openstack.go

@@ -44,11 +44,16 @@ const (
 )
 
 var (
- metadataServiceUrl = url.URL{
+ ipv4MetadataServiceUrl = url.URL{
  Scheme: "http",
  Host: "169.254.169.254",
  Path: "openstack/latest/user_data",
  }
+ ipv6MetadataServiceUrl = url.URL{
+ Scheme: "http",
+ Host: "[fe80::a9fe:a9fe]",
+ Path: "openstack/latest/user_data",
+ }
 )
 
 func init() {
@@ -167,13 +172,23 @@ func fetchConfigFromDevice(logger *log.Logger, ctx context.Context, path string)
 }
 
 func fetchConfigFromMetadataService(f *resource.Fetcher) ([]byte, error) {
- res, err := f.FetchToBuffer(metadataServiceUrl, resource.FetchOptions{})
+ var res []byte
+ var err error
+
+ // Try IPv4 endpoint
+ res, err = f.FetchToBuffer(ipv4MetadataServiceUrl, resource.FetchOptions{})
+ if err == resource.ErrNotFound {
+ return nil, nil
+ } else if err == nil {
+ return res, nil
+ }
 
- // the metadata server exists but doesn't contain any actual metadata,
- // assume that there is no config specified
+ // If IPv4 fails, try IPv6 endpoint
+ res, err = f.FetchToBuffer(ipv6MetadataServiceUrl, resource.FetchOptions{})
  if err == resource.ErrNotFound {
  return nil, nil
  }
 
+ // If both endpoints fail, it will return the appropriate error
  return res, err
 }