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config.go
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config.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package main
import (
"encoding/json"
"fmt"
"io"
"log"
"os"
"path/filepath"
"runtime"
"sort"
"strings"
packersdk "github.com/hashicorp/packer-plugin-sdk/packer"
"github.com/hashicorp/packer/command"
"github.com/hashicorp/packer/packer"
)
// PACKERSPACE is used to represent the spaces that separate args for a command
// without being confused with spaces in the path to the command itself.
const PACKERSPACE = "-PACKERSPACE-"
type config struct {
DisableCheckpoint bool `json:"disable_checkpoint"`
DisableCheckpointSignature bool `json:"disable_checkpoint_signature"`
RawBuilders map[string]string `json:"builders"`
RawProvisioners map[string]string `json:"provisioners"`
RawPostProcessors map[string]string `json:"post-processors"`
Plugins *packer.PluginConfig
}
// decodeConfig 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)
}
// LoadExternalComponentsFromConfig loads plugins defined in RawBuilders, RawProvisioners, and RawPostProcessors.
func (c *config) LoadExternalComponentsFromConfig() {
// helper to build up list of plugin paths
extractPaths := func(m map[string]string) []string {
paths := make([]string, 0, len(m))
for _, v := range m {
paths = append(paths, v)
}
return paths
}
var pluginPaths []string
pluginPaths = append(pluginPaths, extractPaths(c.RawProvisioners)...)
pluginPaths = append(pluginPaths, extractPaths(c.RawBuilders)...)
pluginPaths = append(pluginPaths, extractPaths(c.RawPostProcessors)...)
var externallyUsed = make([]string, 0, len(pluginPaths))
for _, pluginPath := range pluginPaths {
name, err := c.loadSingleComponent(pluginPath)
if err != nil {
log.Print(err)
continue
}
log.Printf("loaded plugin: %s = %s", name, pluginPath)
externallyUsed = append(externallyUsed, name)
}
if len(externallyUsed) > 0 {
sort.Strings(externallyUsed)
log.Printf("using external plugins %v", externallyUsed)
}
}
func (c *config) loadSingleComponent(path string) (string, error) {
pluginName := filepath.Base(path)
// On Windows, ignore any plugins that don't end in .exe.
// We could do a full PATHEXT parse, but this is probably good enough.
if runtime.GOOS == "windows" && strings.ToLower(filepath.Ext(pluginName)) != ".exe" {
return "", fmt.Errorf("error loading plugin %q, no exe extension", path)
}
if _, err := os.Stat(path); err != nil {
return "", fmt.Errorf("error loading plugin %q: %s", path, err)
}
// If the filename has a ".", trim up to there
if idx := strings.Index(pluginName, "."); idx >= 0 {
pluginName = pluginName[:idx]
}
switch {
case strings.HasPrefix(pluginName, "packer-builder-"):
pluginName = pluginName[len("packer-builder-"):]
c.Plugins.Builders.Set(pluginName, func() (packersdk.Builder, error) {
return c.Plugins.Client(path).Builder()
})
case strings.HasPrefix(pluginName, "packer-post-processor-"):
pluginName = pluginName[len("packer-post-processor-"):]
c.Plugins.PostProcessors.Set(pluginName, func() (packersdk.PostProcessor, error) {
return c.Plugins.Client(path).PostProcessor()
})
case strings.HasPrefix(pluginName, "packer-provisioner-"):
pluginName = pluginName[len("packer-provisioner-"):]
c.Plugins.Provisioners.Set(pluginName, func() (packersdk.Provisioner, error) {
return c.Plugins.Client(path).Provisioner()
})
}
return pluginName, nil
}
// This is a proper packer.BuilderFunc that can be used to load packersdk.Builder
// implementations from the defined plugins.
func (c *config) StartBuilder(name string) (packersdk.Builder, error) {
log.Printf("Loading builder: %s\n", name)
return c.Plugins.Builders.Start(name)
}
// This is a proper implementation of packer.HookFunc that can be used
// to load packersdk.Hook implementations from the defined plugins.
func (c *config) StarHook(name string) (packersdk.Hook, error) {
log.Printf("Loading hook: %s\n", name)
return c.Plugins.Client(name).Hook()
}
// This is a proper packersdk.PostProcessorFunc that can be used to load
// packersdk.PostProcessor implementations from defined plugins.
func (c *config) StartPostProcessor(name string) (packersdk.PostProcessor, error) {
log.Printf("Loading post-processor: %s", name)
return c.Plugins.PostProcessors.Start(name)
}
// This is a proper packer.ProvisionerFunc that can be used to load
// packer.Provisioner implementations from defined plugins.
func (c *config) StartProvisioner(name string) (packersdk.Provisioner, error) {
log.Printf("Loading provisioner: %s\n", name)
return c.Plugins.Provisioners.Start(name)
}
func (c *config) discoverInternalComponents() error {
// Get the packer binary path
packerPath, err := os.Executable()
if err != nil {
log.Printf("[ERR] Error loading exe directory: %s", err)
return err
}
for builder := range command.Builders {
builder := builder
if !c.Plugins.Builders.Has(builder) {
bin := fmt.Sprintf("%s%splugin%spacker-builder-%s",
packerPath, PACKERSPACE, PACKERSPACE, builder)
c.Plugins.Builders.Set(builder, func() (packersdk.Builder, error) {
return c.Plugins.Client(bin).Builder()
})
}
}
for provisioner := range command.Provisioners {
provisioner := provisioner
if !c.Plugins.Provisioners.Has(provisioner) {
bin := fmt.Sprintf("%s%splugin%spacker-provisioner-%s",
packerPath, PACKERSPACE, PACKERSPACE, provisioner)
c.Plugins.Provisioners.Set(provisioner, func() (packersdk.Provisioner, error) {
return c.Plugins.Client(bin).Provisioner()
})
}
}
for postProcessor := range command.PostProcessors {
postProcessor := postProcessor
if !c.Plugins.PostProcessors.Has(postProcessor) {
bin := fmt.Sprintf("%s%splugin%spacker-post-processor-%s",
packerPath, PACKERSPACE, PACKERSPACE, postProcessor)
c.Plugins.PostProcessors.Set(postProcessor, func() (packersdk.PostProcessor, error) {
return c.Plugins.Client(bin).PostProcessor()
})
}
}
for dataSource := range command.Datasources {
dataSource := dataSource
if !c.Plugins.DataSources.Has(dataSource) {
bin := fmt.Sprintf("%s%splugin%spacker-datasource-%s",
packerPath, PACKERSPACE, PACKERSPACE, dataSource)
c.Plugins.DataSources.Set(dataSource, func() (packersdk.Datasource, error) {
return c.Plugins.Client(bin).Datasource()
})
}
}
return nil
}