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//go:generate mapstructure-to-hcl2 -type Config
package checksum
import (
"context"
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"fmt"
"hash"
"io"
"os"
"path/filepath"
"github.com/hashicorp/hcl/v2/hcldec"
"github.com/hashicorp/packer/packer-plugin-sdk/common"
packersdk "github.com/hashicorp/packer/packer-plugin-sdk/packer"
"github.com/hashicorp/packer/packer-plugin-sdk/template/config"
"github.com/hashicorp/packer/packer-plugin-sdk/template/interpolate"
)
type Config struct {
common.PackerConfig `mapstructure:",squash"`
ChecksumTypes []string `mapstructure:"checksum_types"`
OutputPath string `mapstructure:"output"`
ctx interpolate.Context
}
type PostProcessor struct {
config Config
}
func getHash(t string) hash.Hash {
var h hash.Hash
switch t {
case "md5":
h = md5.New()
case "sha1":
h = sha1.New()
case "sha224":
h = sha256.New224()
case "sha256":
h = sha256.New()
case "sha384":
h = sha512.New384()
case "sha512":
h = sha512.New()
}
return h
}
func (p *PostProcessor) ConfigSpec() hcldec.ObjectSpec { return p.config.FlatMapstructure().HCL2Spec() }
func (p *PostProcessor) Configure(raws ...interface{}) error {
err := config.Decode(&p.config, &config.DecodeOpts{
PluginType: "checksum",
Interpolate: true,
InterpolateContext: &p.config.ctx,
InterpolateFilter: &interpolate.RenderFilter{
Exclude: []string{"output"},
},
}, raws...)
if err != nil {
return err
}
errs := new(packersdk.MultiError)
if p.config.ChecksumTypes == nil {
p.config.ChecksumTypes = []string{"md5"}
}
for _, k := range p.config.ChecksumTypes {
if h := getHash(k); h == nil {
errs = packersdk.MultiErrorAppend(errs,
fmt.Errorf("Unrecognized checksum type: %s", k))
}
}
if p.config.OutputPath == "" {
p.config.OutputPath = "packer_{{.BuildName}}_{{.BuilderType}}_{{.ChecksumType}}.checksum"
}
if err = interpolate.Validate(p.config.OutputPath, &p.config.ctx); err != nil {
errs = packersdk.MultiErrorAppend(
errs, fmt.Errorf("Error parsing target template: %s", err))
}
if len(errs.Errors) > 0 {
return errs
}
return nil
}
func (p *PostProcessor) PostProcess(ctx context.Context, ui packersdk.Ui, artifact packersdk.Artifact) (packersdk.Artifact, bool, bool, error) {
files := artifact.Files()
var h hash.Hash
var generatedData map[interface{}]interface{}
stateData := artifact.State("generated_data")
if stateData != nil {
// Make sure it's not a nil map so we can assign to it later.
generatedData = stateData.(map[interface{}]interface{})
}
// If stateData has a nil map generatedData will be nil
// and we need to make sure it's not
if generatedData == nil {
generatedData = make(map[interface{}]interface{})
}
generatedData["BuildName"] = p.config.PackerBuildName
generatedData["BuilderType"] = p.config.PackerBuilderType
newartifact := NewArtifact(artifact.Files())
for _, ct := range p.config.ChecksumTypes {
h = getHash(ct)
generatedData["ChecksumType"] = ct
p.config.ctx.Data = generatedData
for _, art := range files {
checksumFile, err := interpolate.Render(p.config.OutputPath, &p.config.ctx)
if err != nil {
return nil, false, true, err
}
if _, err := os.Stat(checksumFile); err != nil {
newartifact.files = append(newartifact.files, checksumFile)
}
if err := os.MkdirAll(filepath.Dir(checksumFile), os.FileMode(0755)); err != nil {
return nil, false, true, fmt.Errorf("unable to create dir: %s", err.Error())
}
fw, err := os.OpenFile(checksumFile, os.O_WRONLY|os.O_APPEND|os.O_CREATE, os.FileMode(0644))
if err != nil {
return nil, false, true, fmt.Errorf("unable to create file %s: %s", checksumFile, err.Error())
}
fr, err := os.Open(art)
if err != nil {
fw.Close()
return nil, false, true, fmt.Errorf("unable to open file %s: %s", art, err.Error())
}
if _, err = io.Copy(h, fr); err != nil {
fr.Close()
fw.Close()
return nil, false, true, fmt.Errorf("unable to compute %s hash for %s", ct, art)
}
fr.Close()
fw.WriteString(fmt.Sprintf("%x\t%s\n", h.Sum(nil), filepath.Base(art)))
fw.Close()
h.Reset()
}
}
// sets keep and forceOverride to true because we don't want to accidentally
// delete the very artifact we're checksumming.
return newartifact, true, true, nil
}
|
