81 lines
1.9 KiB
Go
81 lines
1.9 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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"context"
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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/hcl/v2/hcldec"
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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) ConfigSpec() hcldec.ObjectSpec { return b.config.FlatMapstructure().HCL2Spec() }
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func (b *Builder) Prepare(raws ...interface{}) ([]string, []string, error) {
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warnings, errs := b.config.Prepare(raws...)
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if errs != nil {
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return nil, warnings, errs
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}
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return nil, 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(ctx context.Context, ui packer.Ui, hook packer.Hook) (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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if err != nil {
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return nil, err
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}
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defer source.Close()
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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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if err != nil {
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return nil, err
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}
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defer target.Close()
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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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if hook != nil {
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if err := hook.Run(ctx, packer.HookProvision, ui, new(packer.MockCommunicator), nil); err != nil {
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return nil, err
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}
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}
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return artifact, nil
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}
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