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post-processor.go
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post-processor.go
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package dockersave
import (
"fmt"
"github.com/mitchellh/packer/builder/docker"
"github.com/mitchellh/packer/common"
"github.com/mitchellh/packer/packer"
"github.com/mitchellh/packer/post-processor/docker-import"
"os"
)
const BuilderId = "packer.post-processor.docker-save"
type Config struct {
common.PackerConfig `mapstructure:",squash"`
Path string `mapstructure:"path"`
tpl *packer.ConfigTemplate
}
type PostProcessor struct {
Driver docker.Driver
config Config
}
func (p *PostProcessor) Configure(raws ...interface{}) error {
_, err := common.DecodeConfig(&p.config, raws...)
if err != nil {
return err
}
p.config.tpl, err = packer.NewConfigTemplate()
if err != nil {
return err
}
p.config.tpl.UserVars = p.config.PackerUserVars
// Accumulate any errors
errs := new(packer.MultiError)
templates := map[string]*string{
"path": &p.config.Path,
}
for key, ptr := range templates {
if *ptr == "" {
errs = packer.MultiErrorAppend(
errs, fmt.Errorf("%s must be set", key))
}
*ptr, err = p.config.tpl.Process(*ptr, nil)
if err != nil {
errs = packer.MultiErrorAppend(
errs, fmt.Errorf("Error processing %s: %s", key, err))
}
}
if len(errs.Errors) > 0 {
return errs
}
return nil
}
func (p *PostProcessor) PostProcess(ui packer.Ui, artifact packer.Artifact) (packer.Artifact, bool, error) {
if artifact.BuilderId() != dockerimport.BuilderId {
err := fmt.Errorf(
"Unknown artifact type: %s\nCan only save Docker builder artifacts.",
artifact.BuilderId())
return nil, false, err
}
path := p.config.Path
// Open the file that we're going to write to
f, err := os.Create(path)
if err != nil {
err := fmt.Errorf("Error creating output file: %s", err)
return nil, false, err
}
driver := p.Driver
if driver == nil {
// If no driver is set, then we use the real driver
driver = &docker.DockerDriver{Tpl: p.config.tpl, Ui: ui}
}
ui.Message("Saving image: " + artifact.Id())
if err := driver.SaveImage(artifact.Id(), f); err != nil {
f.Close()
os.Remove(f.Name())
return nil, false, err
}
f.Close()
ui.Message("Saved to: " + path)
return artifact, true, nil
}