support OpenStack instance metadata

builder/openstack/builder.go

@@ -90,6 +90,7 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 			UserData:         b.config.UserData,
 			UserDataFile:     b.config.UserDataFile,
 			ConfigDrive:      b.config.ConfigDrive,
+			InstanceMetadata: b.config.InstanceMetadata,
 		},
 		&StepGetPassword{
 			Debug: b.config.PackerDebug,

builder/openstack/run_config.go

@@ -2,6 +2,7 @@ package openstack
 
 import (
 	"errors"
+	"fmt"
 
 	"github.com/mitchellh/packer/helper/communicator"
 	"github.com/mitchellh/packer/template/interpolate"
@@ -15,17 +16,18 @@ type RunConfig struct {
 	SSHInterface   string              `mapstructure:"ssh_interface"`
 	SSHIPVersion   string              `mapstructure:"ssh_ip_version"`
 
-	SourceImage      string   `mapstructure:"source_image"`
-	SourceImageName  string   `mapstructure:"source_image_name"`
-	Flavor           string   `mapstructure:"flavor"`
-	AvailabilityZone string   `mapstructure:"availability_zone"`
-	RackconnectWait  bool     `mapstructure:"rackconnect_wait"`
-	FloatingIpPool   string   `mapstructure:"floating_ip_pool"`
-	FloatingIp       string   `mapstructure:"floating_ip"`
-	SecurityGroups   []string `mapstructure:"security_groups"`
-	Networks         []string `mapstructure:"networks"`
-	UserData         string   `mapstructure:"user_data"`
-	UserDataFile     string   `mapstructure:"user_data_file"`
+	SourceImage      string            `mapstructure:"source_image"`
+	SourceImageName  string            `mapstructure:"source_image_name"`
+	Flavor           string            `mapstructure:"flavor"`
+	AvailabilityZone string            `mapstructure:"availability_zone"`
+	RackconnectWait  bool              `mapstructure:"rackconnect_wait"`
+	FloatingIpPool   string            `mapstructure:"floating_ip_pool"`
+	FloatingIp       string            `mapstructure:"floating_ip"`
+	SecurityGroups   []string          `mapstructure:"security_groups"`
+	Networks         []string          `mapstructure:"networks"`
+	UserData         string            `mapstructure:"user_data"`
+	UserDataFile     string            `mapstructure:"user_data_file"`
+	InstanceMetadata map[string]string `mapstructure:"instance_metadata"`
 
 	ConfigDrive bool `mapstructure:"config_drive"`
 
@@ -56,5 +58,14 @@ func (c *RunConfig) Prepare(ctx *interpolate.Context) []error {
 		errs = append(errs, errors.New("SSH IP version must be either 4 or 6"))
 	}
 
+	for key, value := range c.InstanceMetadata {
+		if len(key) > 255 {
+			errs = append(errs, fmt.Errorf("Instance metadata key too long (max 255 bytes): %s", key))
+		}
+		if len(value) > 255 {
+			errs = append(errs, fmt.Errorf("Instance metadata value too long (max 255 bytes): %s", value))
+		}
+	}
+
 	return errs
 }

builder/openstack/step_run_source_server.go

@@ -21,6 +21,7 @@ type StepRunSourceServer struct {
 	UserData         string
 	UserDataFile     string
 	ConfigDrive      bool
+	InstanceMetadata map[string]string
 	server           *servers.Server
 }
 
@@ -65,6 +66,7 @@ func (s *StepRunSourceServer) Run(state multistep.StateBag) multistep.StepAction
 		UserData:         userData,
 		ConfigDrive:      &s.ConfigDrive,
 		ServiceClient:    computeClient,
+		Metadata:         s.InstanceMetadata,
 	}
 
 	var serverOptsExt servers.CreateOptsBuilder

website/source/docs/builders/openstack.html.md

@@ -106,6 +106,11 @@ builder.
 -   `metadata` (object of key/value strings) - Glance metadata that will be
     applied to the image.
 
+-   `instance_metadata` (object of key/value strings) - Metadata that is
+    applied to the server instance created by Packer. Also called server
+    properties in some documentation. The strings have a max size of 255 bytes
+    each.
+
 -   `networks` (array of strings) - A list of networks by UUID to attach to
     this instance.