userdata: change handling of bad userdata

Don't fail after encountering bad userdata. Continue processing the metadata
and then exit. This will allow people with bad userdata to actually log in and
see the error.

coreos-cloudinit.go

@@ -62,14 +62,9 @@ func init() {
 }
 
 func main() {
-	flag.Parse()
+	failure := false
 
-	die := func() {
+	flag.Parse()
-		if ignoreFailure {
-			os.Exit(0)
-		}
-		os.Exit(1)
-	}
 
 	if printVersion == true {
 		fmt.Printf("coreos-cloudinit version %s\n", version)
@@ -82,33 +77,33 @@ func main() {
 	case "digitalocean":
 	default:
 		fmt.Printf("Invalid option to -convert-netconf: '%s'. Supported options: 'debian, digitalocean'\n", convertNetconf)
-		os.Exit(1)
+		os.Exit(2)
 	}
 
 	dss := getDatasources()
 	if len(dss) == 0 {
 		fmt.Println("Provide at least one of --from-file, --from-configdrive, --from-ec2-metadata, --from-cloudsigma-metadata, --from-url or --from-proc-cmdline")
-		os.Exit(1)
+		os.Exit(2)
 	}
 
 	ds := selectDatasource(dss)
 	if ds == nil {
 		fmt.Println("No datasources available in time")
-		die()
+		os.Exit(1)
 	}
 
 	fmt.Printf("Fetching user-data from datasource of type %q\n", ds.Type())
 	userdataBytes, err := ds.FetchUserdata()
 	if err != nil {
-		fmt.Printf("Failed fetching user-data from datasource: %v\n", err)
+		fmt.Printf("Failed fetching user-data from datasource: %v\nContinuing...\n", err)
-		die()
+		failure = true
 	}
 
 	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)
-		die()
+		os.Exit(1)
 	}
 
 	// Extract IPv4 addresses from metadata if possible
@@ -117,7 +112,7 @@ func main() {
 		subs, err = initialize.ExtractIPsFromMetadata(metadataBytes)
 		if err != nil {
 			fmt.Printf("Failed extracting IPs from meta-data: %v\n", err)
-			die()
+			os.Exit(1)
 		}
 	}
 
@@ -129,7 +124,7 @@ func main() {
 	var script *system.Script
 	if ccm, err = initialize.ParseMetaData(string(metadataBytes)); err != nil {
 		fmt.Printf("Failed to parse meta-data: %v\n", err)
-		die()
+		os.Exit(1)
 	}
 
 	if ccm != nil {
@@ -137,14 +132,14 @@ func main() {
 		netconfBytes, err := ds.FetchNetworkConfig(ccm.NetworkConfigPath)
 		if err != nil {
 			fmt.Printf("Failed fetching network config from datasource: %v\n", err)
-			die()
+			os.Exit(1)
 		}
 		ccm.NetworkConfig = string(netconfBytes)
 	}
 
 	if ud, err := initialize.ParseUserData(userdata); err != nil {
-		fmt.Printf("Failed to parse user-data: %v\n", err)
+		fmt.Printf("Failed to parse user-data: %v\nContinuing...\n", err)
-		die()
+		failure = true
 	} else {
 		switch t := ud.(type) {
 		case *initialize.CloudConfig:
@@ -172,16 +167,20 @@ func main() {
 	if cc != nil {
 		if err = initialize.Apply(*cc, env); err != nil {
 			fmt.Printf("Failed to apply cloud-config: %v\n", err)
-			die()
+			os.Exit(1)
 		}
 	}
 
 	if script != nil {
 		if err = runScript(*script, env); err != nil {
 			fmt.Printf("Failed to run script: %v\n", err)
-			die()
+			os.Exit(1)
 		}
 	}
+
+	if failure && !ignoreFailure {
+		os.Exit(1)
+	}
 }
 
 // mergeCloudConfig merges certain options from mdcc (a CloudConfig derived from