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// The googlecompute package contains a packer.Builder implementation that
// builds images for Google Compute Engine.
package googlecompute
import (
"fmt"
"log"
"github.com/mitchellh/multistep"
"github.com/mitchellh/packer/common"
"github.com/mitchellh/packer/helper/communicator"
"github.com/mitchellh/packer/packer"
)
// The unique ID for this builder.
const BuilderId = "packer.googlecompute"
// Builder represents a Packer Builder.
type Builder struct {
config *Config
runner multistep.Runner
}
// Prepare processes the build configuration parameters.
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 executes a googlecompute Packer build and returns a packer.Artifact
// representing a GCE machine image.
func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packer.Artifact, error) {
driver, err := NewDriverGCE(
ui, b.config.ProjectId, &b.config.account)
if err != nil {
return nil, err
}
// Set up the state.
state := new(multistep.BasicStateBag)
state.Put("config", b.config)
state.Put("driver", driver)
state.Put("hook", hook)
state.Put("ui", ui)
// Build the steps.
steps := []multistep.Step{
new(StepCheckExistingImage),
&StepCreateSSHKey{
Debug: b.config.PackerDebug,
DebugKeyPath: fmt.Sprintf("gce_%s.pem", b.config.PackerBuildName),
},
&StepCreateInstance{
Debug: b.config.PackerDebug,
},
&StepInstanceInfo{
Debug: b.config.PackerDebug,
},
&communicator.StepConnect{
Config: &b.config.Comm,
Host: commHost,
SSHConfig: sshConfig,
},
new(common.StepProvision),
new(StepTeardownInstance),
new(StepCreateImage),
}
// Run the steps.
if b.config.PackerDebug {
b.runner = &multistep.DebugRunner{
Steps: steps,
PauseFn: common.MultistepDebugFn(ui),
}
} else {
b.runner = &multistep.BasicRunner{Steps: steps}
}
b.runner.Run(state)
// Report any errors.
if rawErr, ok := state.GetOk("error"); ok {
return nil, rawErr.(error)
}
if _, ok := state.GetOk("image_name"); !ok {
log.Println("Failed to find image_name in state. Bug?")
return nil, nil
}
artifact := &Artifact{
imageName: state.Get("image_name").(string),
driver: driver,
}
return artifact, nil
}
// Cancel.
func (b *Builder) Cancel() {
if b.runner != nil {
log.Println("Cancelling the step runner...")
b.runner.Cancel()
}
}
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