feat(metadata): Distinguish between userdata and metadata for datasources

initialize/config.go

@@ -34,10 +34,11 @@ type CloudConfig struct {
 		Update UpdateConfig
 		Units  []system.Unit
 	}
-	WriteFiles     []system.File `yaml:"write_files"`
-	Hostname       string
-	Users          []system.User
-	ManageEtcHosts EtcHosts `yaml:"manage_etc_hosts"`
+	WriteFiles        []system.File `yaml:"write_files"`
+	Hostname          string
+	Users             []system.User
+	ManageEtcHosts    EtcHosts `yaml:"manage_etc_hosts"`
+	NetworkConfigPath string
 }
 
 type warner func(format string, v ...interface{})

initialize/meta_data.go

@@ -0,0 +1,26 @@
+package initialize
+
+import (
+	"encoding/json"
+)
+
+func ParseMetaData(contents string) (cfg CloudConfig, err error) {
+	var metadata struct {
+		SSHAuthorizedKeyMap map[string]string `json:"public_keys"`
+		Hostname            string            `json:"hostname"`
+		NetworkConfig       struct {
+			ContentPath string `json:"content_path"`
+		} `json:"network_config"`
+	}
+	if err = json.Unmarshal([]byte(contents), &metadata); err != nil {
+		return
+	}
+
+	cfg.SSHAuthorizedKeys = make([]string, 0, len(metadata.SSHAuthorizedKeyMap))
+	for _, key := range metadata.SSHAuthorizedKeyMap {
+		cfg.SSHAuthorizedKeys = append(cfg.SSHAuthorizedKeys, key)
+	}
+	cfg.Hostname = metadata.Hostname
+	cfg.NetworkConfigPath = metadata.NetworkConfig.ContentPath
+	return
+}