packer: Provisioner interface

packer/provisioner.go

+package packer
+
+// A provisioner is responsible for installing and configuring software
+// on a machine prior to building the actual image.
+type Provisioner interface {
+	// Prepare is called with the raw configuration and a UI element in
+	// order to setup the internal state of the provisioner and perform
+	// any validation necessary for the provisioner.
+	Prepare(interface{}, Ui)
+
+	// Provision is called to actually provision the machine. A UI is
+	// given to communicate with the user, and a communicator is given that
+	// is guaranteed to be connected to some machine so that provisioning
+	// can be done.
+	Provision(Ui, Communicator)
+}