packer-cn/config.go

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package main
import (
"encoding/json"
"github.com/mitchellh/osext"
"github.com/mitchellh/packer/packer"
"github.com/mitchellh/packer/packer/plugin"
"io"
"log"
"os/exec"
"path/filepath"
)
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// 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",
"amazon-instance": "packer-builder-amazon-instance",
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"digitalocean": "packer-builder-digitalocean",
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"virtualbox": "packer-builder-virtualbox",
"vmware": "packer-builder-vmware"
},
"commands": {
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"build": "packer-command-build",
"fix": "packer-command-fix",
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"validate": "packer-command-validate"
},
"post-processors": {
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"vagrant": "packer-post-processor-vagrant"
},
"provisioners": {
"file": "packer-provisioner-file",
"shell": "packer-provisioner-shell"
}
}
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`
type config struct {
PluginMinPort uint
PluginMaxPort uint
Builders map[string]string
Commands map[string]string
PostProcessors map[string]string `json:"post-processors"`
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)
}
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// Returns an array of defined command names.
func (c *config) CommandNames() (result []string) {
result = make([]string, 0, len(c.Commands))
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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
}
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return c.pluginClient(bin).Builder()
}
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// 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)
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bin, ok := c.Commands[name]
if !ok {
log.Printf("Command not found: %s\n", name)
return nil, nil
}
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return c.pluginClient(bin).Command()
}
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// This is a proper implementation of packer.HookFunc that can be used
// to load packer.Hook implementations from the defined plugins.
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func (c *config) LoadHook(name string) (packer.Hook, error) {
log.Printf("Loading hook: %s\n", name)
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return c.pluginClient(name).Hook()
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}
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// This is a proper packer.PostProcessorFunc that can be used to load
// packer.PostProcessor implementations from defined plugins.
func (c *config) LoadPostProcessor(name string) (packer.PostProcessor, error) {
log.Printf("Loading post-processor: %s", name)
bin, ok := c.PostProcessors[name]
if !ok {
log.Printf("Post-processor not found: %s", name)
return nil, nil
}
return c.pluginClient(bin).PostProcessor()
}
// This is a proper packer.ProvisionerFunc that can be used to load
// packer.Provisioner implementations from defined plugins.
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func (c *config) LoadProvisioner(name string) (packer.Provisioner, error) {
log.Printf("Loading provisioner: %s\n", name)
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bin, ok := c.Provisioners[name]
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if !ok {
log.Printf("Provisioner not found: %s\n", name)
return nil, nil
}
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return c.pluginClient(bin).Provisioner()
}
func (c *config) pluginClient(path string) *plugin.Client {
originalPath := path
// First attempt to find the executable by consulting the PATH.
path, err := exec.LookPath(path)
if err != nil {
// If that doesn't work, look for it in the same directory
// as the `packer` executable (us).
log.Printf("Plugin could not be found. Checking same directory as executable.")
exePath, err := osext.Executable()
if err != nil {
log.Printf("Couldn't get current exe path: %s", err)
} else {
log.Printf("Current exe path: %s", exePath)
path = filepath.Join(filepath.Dir(exePath), filepath.Base(originalPath))
}
}
// If everything failed, just use the original path and let the error
// bubble through.
if path == "" {
path = originalPath
}
log.Printf("Creating plugin client for path: %s", path)
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var config plugin.ClientConfig
config.Cmd = exec.Command(path)
config.Managed = true
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config.MinPort = c.PluginMinPort
config.MaxPort = c.PluginMaxPort
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return plugin.NewClient(&config)
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}