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