101 lines
2.8 KiB
Go
101 lines
2.8 KiB
Go
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package manifest
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"time"
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"github.com/mitchellh/packer/common"
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"github.com/mitchellh/packer/helper/config"
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"github.com/mitchellh/packer/packer"
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"github.com/mitchellh/packer/template/interpolate"
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)
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// The artifact-override post-processor allows you to specify arbitrary files as
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// artifacts. These will override any other artifacts created by the builder.
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// This allows you to use a builder and provisioner to create some file, such as
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// a compiled binary or tarball, extract it from the builder (VM or container)
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// and then save that binary or tarball and throw away the builder.
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type Config struct {
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common.PackerConfig `mapstructure:",squash"`
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Filename string `mapstructure:"filename"`
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ctx interpolate.Context
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}
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type PostProcessor struct {
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config Config
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}
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type ManifestFile struct {
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Builds []Artifact `json:"builds"`
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}
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func (p *PostProcessor) Configure(raws ...interface{}) error {
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err := config.Decode(&p.config, &config.DecodeOpts{
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Interpolate: true,
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InterpolateContext: &p.config.ctx,
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InterpolateFilter: &interpolate.RenderFilter{
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Exclude: []string{},
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},
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}, raws...)
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if err != nil {
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return err
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}
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if p.config.Filename == "" {
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p.config.Filename = "packer-manifest.json"
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}
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return nil
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}
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func (p *PostProcessor) PostProcess(ui packer.Ui, source packer.Artifact) (packer.Artifact, bool, error) {
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artifact := &Artifact{}
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// Create the current artifact.
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artifact.BuildFiles = source.Files()
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artifact.BuildId = source.Id()
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artifact.BuildName = source.BuilderId()
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artifact.BuildTime = time.Now().Unix()
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artifact.Description = source.String()
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// Create a lock file with exclusive access. If this fails we will retry
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// after a delay
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lockFilename := p.config.Filename + ".lock"
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_, err := os.OpenFile(lockFilename, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600)
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defer os.Remove(lockFilename)
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// Read the current manifest file from disk
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contents := []byte{}
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if contents, err = ioutil.ReadFile(p.config.Filename); err != nil && !os.IsNotExist(err) {
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return nil, true, fmt.Errorf("Unable to open %s for reading: %s", p.config.Filename, err)
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}
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// Parse the manifest file JSON, if we have some
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manifestFile := &ManifestFile{}
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if len(contents) > 0 {
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if err = json.Unmarshal(contents, manifestFile); err != nil {
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return nil, true, fmt.Errorf("Unable to parse content from %s: %s", p.config.Filename, err)
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}
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}
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// Add the current artifact to the manifest file
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manifestFile.Builds = append(manifestFile.Builds, *artifact)
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// Write JSON to disk
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if out, err := json.Marshal(manifestFile); err == nil {
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if err := ioutil.WriteFile(p.config.Filename, out, 0664); err != nil {
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return nil, true, fmt.Errorf("Unable to write %s: %s", p.config.Filename, err)
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}
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} else {
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return nil, true, fmt.Errorf("Unable to marshal JSON %s", err)
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}
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return artifact, true, err
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}
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