provisioner/*: implement Cancel

provisioner/chef-solo/provisioner.go

@@ -183,6 +183,12 @@ func (p *Provisioner) Provision(ui packer.Ui, comm packer.Communicator) error {
 	return nil
 }
 
+func (p *Provisioner) Cancel() {
+	// Just hard quit. It isn't a big deal if what we're doing keeps
+	// running on the other side.
+	os.Exit(0)
+}
+
 func (p *Provisioner) uploadDirectory(ui packer.Ui, comm packer.Communicator, dst string, src string) error {
 	if err := p.createDir(ui, comm, dst); err != nil {
 		return err

provisioner/file/provisioner.go

@@ -84,3 +84,9 @@ func (p *Provisioner) Provision(ui packer.Ui, comm packer.Communicator) error {
 	}
 	return err
 }
+
+func (p *Provisioner) Cancel() {
+	// Just hard quit. It isn't a big deal if what we're doing keeps
+	// running on the other side.
+	os.Exit(0)
+}

provisioner/salt-masterless/provisioner.go

@@ -200,6 +200,12 @@ func (p *Provisioner) Provision(ui packer.Ui, comm packer.Communicator) error {
 	return nil
 }
 
+func (p *Provisioner) Cancel() {
+	// Just hard quit. It isn't a big deal if what we're doing keeps
+	// running on the other side.
+	os.Exit(0)
+}
+
 func UploadLocalDirectory(localDir string, remoteDir string, comm packer.Communicator, ui packer.Ui) (err error) {
 	visitPath := func(localPath string, f os.FileInfo, err error) (err2 error) {
 		localRelPath := strings.Replace(localPath, localDir, "", 1)

provisioner/shell/provisioner.go

@@ -281,6 +281,12 @@ func (p *Provisioner) Provision(ui packer.Ui, comm packer.Communicator) error {
 	return nil
 }
 
+func (p *Provisioner) Cancel() {
+	// Just hard quit. It isn't a big deal if what we're doing keeps
+	// running on the other side.
+	os.Exit(0)
+}
+
 // retryable will retry the given function over and over until a
 // non-error is returned.
 func (p *Provisioner) retryable(f func() error) error {