Merge pull request #152 from crawford/metadata

feat(meta_data): Add partial support for meta_data.json

coreos-cloudinit.go

@@ -1,16 +1,12 @@
 package main
 
 import (
-	"encoding/json"
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"os"
-	"path"
 
 	"github.com/coreos/coreos-cloudinit/datasource"
 	"github.com/coreos/coreos-cloudinit/initialize"
-	"github.com/coreos/coreos-cloudinit/network"
 	"github.com/coreos/coreos-cloudinit/system"
 )
 
@@ -79,7 +75,7 @@ func main() {
 	}
 
 	fmt.Printf("Fetching user-data from datasource of type %q\n", ds.Type())
-	userdataBytes, err := ds.Fetch()
+	userdataBytes, err := ds.FetchUserdata()
 	if err != nil {
 		fmt.Printf("Failed fetching user-data from datasource: %v\n", err)
 		if ignoreFailure {
@@ -89,25 +85,38 @@ func main() {
 		}
 	}
 
-	env := initialize.NewEnvironment("/", workspace)
+	fmt.Printf("Fetching meta-data from datasource of type %q\n", ds.Type())
+	metadataBytes, err := ds.FetchMetadata()
+	if err != nil {
+		fmt.Printf("Failed fetching meta-data from datasource: %v\n", err)
+		if ignoreFailure {
+			os.Exit(0)
+		} else {
+			os.Exit(1)
+		}
+	}
+
+	env := initialize.NewEnvironment("/", ds.ConfigRoot(), workspace, convertNetconf, sshKeyName)
 	if len(userdataBytes) > 0 {
 		if err := processUserdata(string(userdataBytes), env); err != nil {
-			fmt.Printf("Failed resolving user-data: %v\n", err)
+			fmt.Printf("Failed to process user-data: %v\n", err)
 			if !ignoreFailure {
 				os.Exit(1)
 			}
 		}
 	} else {
-		fmt.Println("No user data to handle.")
+		fmt.Println("No user-data to handle.")
 	}
 
-	if convertNetconf != "" {
-		if err := processNetconf(convertNetconf, configdrive); err != nil {
-			fmt.Printf("Failed to process network config: %v\n", err)
+	if len(metadataBytes) > 0 {
+		if err := processMetadata(string(metadataBytes), env); err != nil {
+			fmt.Printf("Failed to process meta-data: %v\n", err)
 			if !ignoreFailure {
 				os.Exit(1)
 			}
 		}
+	} else {
+		fmt.Println("No meta-data to handle.")
 	}
 }
 
@@ -142,47 +151,17 @@ func processUserdata(userdata string, env *initialize.Environment) error {
 	return err
 }
 
-func processNetconf(convertNetconf, configdrive string) error {
-	openstackRoot := path.Join(configdrive, "openstack")
-	metadataFilename := path.Join(openstackRoot, "latest", "meta_data.json")
-	metadataBytes, err := ioutil.ReadFile(metadataFilename)
+func processMetadata(metadata string, env *initialize.Environment) error {
+	parsed, err := initialize.ParseMetaData(metadata)
 	if err != nil {
+		fmt.Printf("Failed parsing meta-data: %v\n", err)
 		return err
 	}
-
-	var metadata struct {
-		NetworkConfig struct {
-			ContentPath string `json:"content_path"`
-		} `json:"network_config"`
-	}
-	if err := json.Unmarshal(metadataBytes, &metadata); err != nil {
-		return err
-	}
-	configPath := metadata.NetworkConfig.ContentPath
-	if configPath == "" {
-		fmt.Printf("No network config specified in %q.\n", metadataFilename)
-		return nil
-	}
-
-	netconfBytes, err := ioutil.ReadFile(path.Join(openstackRoot, configPath))
+	err = initialize.PrepWorkspace(env.Workspace())
 	if err != nil {
+		fmt.Printf("Failed preparing workspace: %v\n", err)
 		return err
 	}
 
-	var interfaces []network.InterfaceGenerator
-	switch convertNetconf {
-	case "debian":
-		interfaces, err = network.ProcessDebianNetconf(string(netconfBytes))
-	default:
-		return fmt.Errorf("Unsupported network config format %q", convertNetconf)
-	}
-
-	if err != nil {
-		return err
-	}
-
-	if err := system.WriteNetworkdConfigs(interfaces); err != nil {
-		return err
-	}
-	return system.RestartNetwork(interfaces)
+	return initialize.Apply(parsed, env)
 }

datasource/configdrive.go

@@ -7,21 +7,33 @@ import (
 )
 
 type configDrive struct {
-	path string
+	root string
 }
 
-func NewConfigDrive(path string) *configDrive {
-	return &configDrive{path}
+func NewConfigDrive(root string) *configDrive {
+	return &configDrive{path.Join(root, "openstack")}
 }
 
-func (self *configDrive) Fetch() ([]byte, error) {
-	data, err := ioutil.ReadFile(path.Join(self.path, "openstack", "latest", "user_data"))
-	if os.IsNotExist(err) {
-		err = nil
+func (self *configDrive) ConfigRoot() string {
+	return self.root
 }
-	return data, err
+
+func (self *configDrive) FetchMetadata() ([]byte, error) {
+	return self.readFile("meta_data.json")
+}
+
+func (self *configDrive) FetchUserdata() ([]byte, error) {
+	return self.readFile("user_data")
 }
 
 func (self *configDrive) Type() string {
 	return "cloud-drive"
 }
+
+func (self *configDrive) readFile(filename string) ([]byte, error) {
+	data, err := ioutil.ReadFile(path.Join(self.root, "latest", filename))
+	if os.IsNotExist(err) {
+		err = nil
+	}
+	return data, err
+}

datasource/datasource.go

@@ -1,6 +1,8 @@
 package datasource
 
 type Datasource interface {
-	Fetch() ([]byte, error)
+	ConfigRoot() string
+	FetchMetadata() ([]byte, error)
+	FetchUserdata() ([]byte, error)
 	Type() string
 }

datasource/file.go

@@ -12,7 +12,15 @@ func NewLocalFile(path string) *localFile {
 	return &localFile{path}
 }
 
-func (self *localFile) Fetch() ([]byte, error) {
+func (self *localFile) ConfigRoot() string {
+	return ""
+}
+
+func (self *localFile) FetchMetadata() ([]byte, error) {
+	return []byte{}, nil
+}
+
+func (self *localFile) FetchUserdata() ([]byte, error) {
 	return ioutil.ReadFile(self.path)
 }
 

datasource/metadata_service.go

@@ -10,7 +10,15 @@ func NewMetadataService(url string) *metadataService {
 	return &metadataService{url}
 }
 
-func (ms *metadataService) Fetch() ([]byte, error) {
+func (self *metadataService) ConfigRoot() string {
+	return ""
+}
+
+func (self *metadataService) FetchMetadata() ([]byte, error) {
+	return []byte{}, nil
+}
+
+func (ms *metadataService) FetchUserdata() ([]byte, error) {
 	client := pkg.NewHttpClient()
 	return client.Get(ms.url)
 }

datasource/proc_cmdline.go

@@ -22,7 +22,15 @@ func NewProcCmdline() *procCmdline {
 	return &procCmdline{Location: ProcCmdlineLocation}
 }
 
-func (self *procCmdline) Fetch() ([]byte, error) {
+func (self *procCmdline) ConfigRoot() string {
+	return ""
+}
+
+func (self *procCmdline) FetchMetadata() ([]byte, error) {
+	return []byte{}, nil
+}
+
+func (self *procCmdline) FetchUserdata() ([]byte, error) {
 	contents, err := ioutil.ReadFile(self.Location)
 	if err != nil {
 		return nil, err

datasource/proc_cmdline_test.go

@@ -77,7 +77,7 @@ func TestProcCmdlineAndFetchConfig(t *testing.T) {
 
 	p := NewProcCmdline()
 	p.Location = file.Name()
-	cfg, err := p.Fetch()
+	cfg, err := p.FetchUserdata()
 	if err != nil {
 		t.Errorf("Test produced error: %v", err)
 	}

initialize/config.go

@@ -3,10 +3,13 @@ package initialize
 import (
 	"errors"
 	"fmt"
+	"io/ioutil"
 	"log"
+	"path"
 
 	"github.com/coreos/coreos-cloudinit/third_party/launchpad.net/goyaml"
 
+	"github.com/coreos/coreos-cloudinit/network"
 	"github.com/coreos/coreos-cloudinit/system"
 )
 
@@ -38,6 +41,7 @@ type CloudConfig struct {
 	Hostname          string
 	Users             []system.User
 	ManageEtcHosts    EtcHosts `yaml:"manage_etc_hosts"`
+	NetworkConfigPath string
 }
 
 type warner func(format string, v ...interface{})
@@ -227,6 +231,32 @@ func Apply(cfg CloudConfig, env *Environment) error {
 		log.Printf("Wrote file %s to filesystem", path)
 	}
 
+	if env.NetconfType() != "" {
+		netconfBytes, err := ioutil.ReadFile(path.Join(env.ConfigRoot(), cfg.NetworkConfigPath))
+		if err != nil {
+			return err
+		}
+
+		var interfaces []network.InterfaceGenerator
+		switch env.NetconfType() {
+		case "debian":
+			interfaces, err = network.ProcessDebianNetconf(string(netconfBytes))
+		default:
+			return fmt.Errorf("Unsupported network config format %q", env.NetconfType())
+		}
+
+		if err != nil {
+			return err
+		}
+
+		if err := system.WriteNetworkdConfigs(interfaces); err != nil {
+			return err
+		}
+		if err := system.RestartNetwork(interfaces); err != nil {
+			return err
+		}
+	}
+
 	commands := make(map[string]string, 0)
 	reload := false
 	for _, unit := range cfg.Coreos.Units {

initialize/env.go

@@ -10,17 +10,19 @@ const DefaultSSHKeyName = "coreos-cloudinit"
 
 type Environment struct {
 	root          string
+	configRoot    string
 	workspace     string
+	netconfType   string
 	sshKeyName    string
 	substitutions map[string]string
 }
 
-func NewEnvironment(root, workspace string) *Environment {
+func NewEnvironment(root, configRoot, workspace, netconfType, sshKeyName string) *Environment {
 	substitutions := map[string]string{
 		"$public_ipv4":  os.Getenv("COREOS_PUBLIC_IPV4"),
 		"$private_ipv4": os.Getenv("COREOS_PRIVATE_IPV4"),
 	}
-	return &Environment{root, workspace, DefaultSSHKeyName, substitutions}
+	return &Environment{root, configRoot, workspace, netconfType, sshKeyName, substitutions}
 }
 
 func (self *Environment) Workspace() string {
@@ -31,6 +33,14 @@ func (self *Environment) Root() string {
 	return self.root
 }
 
+func (self *Environment) ConfigRoot() string {
+	return self.configRoot
+}
+
+func (self *Environment) NetconfType() string {
+	return self.netconfType
+}
+
 func (self *Environment) SSHKeyName() string {
 	return self.sshKeyName
 }

initialize/env_test.go

@@ -8,7 +8,7 @@ import (
 func TestEnvironmentApply(t *testing.T) {
 	os.Setenv("COREOS_PUBLIC_IPV4", "192.0.2.3")
 	os.Setenv("COREOS_PRIVATE_IPV4", "192.0.2.203")
-	env := NewEnvironment("./", "./")
+	env := NewEnvironment("./", "./", "./", "", "")
 	input := `[Service]
 ExecStart=/usr/bin/echo "$public_ipv4"
 ExecStop=/usr/bin/echo $private_ipv4

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
+}