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package file
/*
The File builder creates an artifact from a file. Because it does not require
any virtualization or network resources, it's very fast and useful for testing.
*/
import (
"fmt"
"io"
"io/ioutil"
"os"
"github.com/hashicorp/packer/helper/multistep"
"github.com/hashicorp/packer/packer"
)
const BuilderId = "packer.file"
type Builder struct {
config *Config
runner multistep.Runner
}
func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
c, warnings, errs := NewConfig(raws...)
if errs != nil {
return warnings, errs
}
b.config = c
return warnings, nil
}
// Run is where the actual build should take place. It takes a Build and a Ui.
func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packer.Artifact, error) {
artifact := new(FileArtifact)
if b.config.Source != "" {
source, err := os.Open(b.config.Source)
defer source.Close()
if err != nil {
return nil, err
}
// Create will truncate an existing file
target, err := os.Create(b.config.Target)
defer target.Close()
if err != nil {
return nil, err
}
ui.Say(fmt.Sprintf("Copying %s to %s", source.Name(), target.Name()))
bytes, err := io.Copy(target, source)
if err != nil {
return nil, err
}
ui.Say(fmt.Sprintf("Copied %d bytes", bytes))
artifact.filename = target.Name()
} else {
// We're going to write Contents; if it's empty we'll just create an
// empty file.
err := ioutil.WriteFile(b.config.Target, []byte(b.config.Content), 0600)
if err != nil {
return nil, err
}
artifact.filename = b.config.Target
}
return artifact, nil
}
// Cancel cancels a possibly running Builder. This should block until
// the builder actually cancels and cleans up after itself.
func (b *Builder) Cancel() {
b.runner.Cancel()
}
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