68 lines
1.7 KiB
Go
68 lines
1.7 KiB
Go
package packer
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import (
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"sync"
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)
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// A provisioner is responsible for installing and configuring software
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// on a machine prior to building the actual image.
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type Provisioner interface {
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// Prepare is called with a set of configurations to setup the
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// internal state of the provisioner. The multiple configurations
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// should be merged in some sane way.
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Prepare(...interface{}) error
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// Provision is called to actually provision the machine. A UI is
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// given to communicate with the user, and a communicator is given that
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// is guaranteed to be connected to some machine so that provisioning
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// can be done.
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Provision(Ui, Communicator) error
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// Cancel is called to cancel the provisioning. This is usually called
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// while Provision is still being called. The Provisioner should act
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// to stop its execution as quickly as possible in a race-free way.
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Cancel()
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}
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// A Hook implementation that runs the given provisioners.
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type ProvisionHook struct {
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// The provisioners to run as part of the hook. These should already
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// be prepared (by calling Prepare) at some earlier stage.
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Provisioners []Provisioner
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lock sync.Mutex
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runningProvisioner Provisioner
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}
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// Runs the provisioners in order.
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func (h *ProvisionHook) Run(name string, ui Ui, comm Communicator, data interface{}) error {
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defer func() {
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h.lock.Lock()
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defer h.lock.Unlock()
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h.runningProvisioner = nil
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}()
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for _, p := range h.Provisioners {
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h.lock.Lock()
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h.runningProvisioner = p
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h.lock.Unlock()
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if err := p.Provision(ui, comm); err != nil {
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return err
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}
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}
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return nil
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}
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// Cancels the privisioners that are still running.
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func (h *ProvisionHook) Cancel() {
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h.lock.Lock()
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defer h.lock.Unlock()
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if h.runningProvisioner != nil {
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h.runningProvisioner.Cancel()
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}
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}
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