97 lines
2.4 KiB
Go
97 lines
2.4 KiB
Go
package packer
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import "log"
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// A Build represents a single job within Packer that is responsible for
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// building some machine image artifact. Builds are meant to be parallelized.
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type Build interface {
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Name() string
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Prepare(Ui) error
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Run(Ui, Cache) Artifact
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Cancel()
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}
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// A build struct represents a single build job, the result of which should
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// be a single machine image artifact. This artifact may be comprised of
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// multiple files, of course, but it should be for only a single provider
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// (such as VirtualBox, EC2, etc.).
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type coreBuild struct {
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name string
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builder Builder
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builderConfig interface{}
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hooks map[string][]Hook
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provisioners []coreBuildProvisioner
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prepareCalled bool
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}
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// Keeps track of the provisioner and the configuration of the provisioner
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// within the build.
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type coreBuildProvisioner struct {
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provisioner Provisioner
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config []interface{}
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}
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// Returns the name of the build.
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func (b *coreBuild) Name() string {
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return b.name
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}
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// Prepare prepares the build by doing some initialization for the builder
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// and any hooks. This _must_ be called prior to Run.
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func (b *coreBuild) Prepare(ui Ui) (err error) {
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// TODO: lock
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b.prepareCalled = true
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// Prepare the builder
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err = b.builder.Prepare(b.builderConfig)
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if err != nil {
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log.Printf("Build '%s' prepare failure: %s\n", b.name, err)
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}
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// Prepare the provisioners
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for _, coreProv := range b.provisioners {
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if err = coreProv.provisioner.Prepare(coreProv.config...); err != nil {
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return
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}
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}
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return
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}
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// Runs the actual build. Prepare must be called prior to running this.
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func (b *coreBuild) Run(ui Ui, cache Cache) Artifact {
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if !b.prepareCalled {
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panic("Prepare must be called first")
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}
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// Copy the hooks
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hooks := make(map[string][]Hook)
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for hookName, hookList := range b.hooks {
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hooks[hookName] = make([]Hook, len(hookList))
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copy(hooks[hookName], hookList)
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}
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// Add a hook for the provisioners if we have provisioners
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if len(b.provisioners) > 0 {
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provisioners := make([]Provisioner, len(b.provisioners))
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for i, p := range b.provisioners {
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provisioners[i] = p.provisioner
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}
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if _, ok := hooks[HookProvision]; !ok {
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hooks[HookProvision] = make([]Hook, 0, 1)
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}
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hooks[HookProvision] = append(hooks[HookProvision], &ProvisionHook{provisioners})
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}
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hook := &DispatchHook{hooks}
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return b.builder.Run(ui, hook, cache)
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}
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// Cancels the build if it is running.
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func (b *coreBuild) Cancel() {
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b.builder.Cancel()
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}
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