D13503.diff
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	diff --git a/src/applications/drydock/blueprint/DrydockBlueprintImplementation.php b/src/applications/drydock/blueprint/DrydockBlueprintImplementation.php
	--- a/src/applications/drydock/blueprint/DrydockBlueprintImplementation.php
	+++ b/src/applications/drydock/blueprint/DrydockBlueprintImplementation.php
	@@ -10,6 +10,7 @@
	private $activeResource;
	private $activeLease;
	private $instance;
	+ private $scopes = array();

	abstract public function getType();
	abstract public function getInterface(
	@@ -617,10 +618,11 @@
	DrydockResource $resource = null,
	DrydockLease $lease = null) {

	- if (($this->activeResource !== null) \|\|
	- ($this->activeLease !== null)) {
	- throw new Exception(pht('There is already an active resource or lease!'));
	- }
	+ $scope = array(
	+ 'resource' => $resource,
	+ 'lease' => $lease,
	+ );
	+ array_push($this->scopes, $scope);

	$this->activeResource = $resource;
	$this->activeLease = $lease;
	@@ -629,8 +631,20 @@
	}

	public function popActiveScope() {
	- $this->activeResource = null;
	- $this->activeLease = null;
	+ if (count($this->scopes) === 0) {
	+ throw new Exception('Unable to pop active scope; no scopes active');
	+ }
	+
	+ array_pop($this->scopes);
	+
	+ if (count($this->scopes) === 0) {
	+ $this->activeResource = null;
	+ $this->activeLease = null;
	+ } else {
	+ $current = last($this->scopes);
	+ $this->activeResource = $current['resource'];
	+ $this->activeLease = $current['lease'];
	+ }
	}

	}