packer-cn/config.go

114 lines
2.8 KiB
Go

package main
import (
"encoding/json"
"github.com/mitchellh/packer/packer"
"github.com/mitchellh/packer/packer/plugin"
"io"
"log"
"os/exec"
)
// This is the default, built-in configuration that ships with
// Packer.
const defaultConfig = `
{
"plugin_min_port": 10000,
"plugin_max_port": 25000,
"builders": {
"amazon-ebs": "packer-builder-amazon-ebs",
"virtualbox": "packer-builder-virtualbox",
"vmware": "packer-builder-vmware"
},
"commands": {
"build": "packer-command-build"
},
"provisioners": {
"shell": "packer-provisioner-shell"
}
}
`
type config struct {
PluginMinPort uint
PluginMaxPort uint
Builders map[string]string
Commands map[string]string
Provisioners map[string]string
}
// Decodes configuration in JSON format from the given io.Reader into
// the config object pointed to.
func decodeConfig(r io.Reader, c *config) error {
decoder := json.NewDecoder(r)
return decoder.Decode(c)
}
// Returns an array of defined command names.
func (c *config) CommandNames() (result []string) {
result = make([]string, 0, len(c.Commands))
for name, _ := range c.Commands {
result = append(result, name)
}
return
}
// This is a proper packer.BuilderFunc that can be used to load packer.Builder
// implementations from the defined plugins.
func (c *config) LoadBuilder(name string) (packer.Builder, error) {
log.Printf("Loading builder: %s\n", name)
bin, ok := c.Builders[name]
if !ok {
log.Printf("Builder not found: %s\n", name)
return nil, nil
}
return c.pluginClient(bin).Builder()
}
// This is a proper packer.CommandFunc that can be used to load packer.Command
// implementations from the defined plugins.
func (c *config) LoadCommand(name string) (packer.Command, error) {
log.Printf("Loading command: %s\n", name)
bin, ok := c.Commands[name]
if !ok {
log.Printf("Command not found: %s\n", name)
return nil, nil
}
return c.pluginClient(bin).Command()
}
// This is a proper implementation of packer.HookFunc that can be used
// to load packer.Hook implementations from the defined plugins.
func (c *config) LoadHook(name string) (packer.Hook, error) {
log.Printf("Loading hook: %s\n", name)
return c.pluginClient(name).Hook()
}
// This is a proper packer.ProvisionerFunc that can be used to load
// packer.Provisioner implementations from defined plugins.
func (c *config) LoadProvisioner(name string) (packer.Provisioner, error) {
log.Printf("Loading provisioner: %s\n", name)
bin, ok := c.Provisioners[name]
if !ok {
log.Printf("Provisioner not found: %s\n", name)
return nil, nil
}
return c.pluginClient(bin).Provisioner()
}
func (c *config) pluginClient(path string) *plugin.Client {
var config plugin.ClientConfig
config.Cmd = exec.Command(path)
config.Managed = true
config.MinPort = c.PluginMinPort
config.MaxPort = c.PluginMaxPort
return plugin.NewClient(&config)
}