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PhabricatorConfigStackSource.php
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			<?php

			/**
			* Configuration source which reads from a stack of other configuration
			* sources.
			*
			* This source is writable if any source in the stack is writable. Writes happen
			* to the first writable source only.
			*/
			final class PhabricatorConfigStackSource
			extends PhabricatorConfigSource {

			private $stack = array();

			public function pushSource(PhabricatorConfigSource $source) {
			array_unshift($this->stack, $source);
			return $this;
			}

			public function popSource() {
			if (empty($this->stack)) {
			throw new Exception(pht('Popping an empty %s!', __CLASS__));
			}
			return array_shift($this->stack);
			}

			public function getStack() {
			return $this->stack;
			}

			public function getKeys(array $keys) {
			$result = array();
			foreach ($this->stack as $source) {
			$result = $result + $source->getKeys($keys);
			}
			return $result;
			}

			public function getAllKeys() {
			$result = array();
			foreach ($this->stack as $source) {
			$result = $result + $source->getAllKeys();
			}
			return $result;
			}

			public function canWrite() {
			foreach ($this->stack as $source) {
			if ($source->canWrite()) {
			return true;
			}
			}
			return false;
			}

			public function setKeys(array $keys) {
			foreach ($this->stack as $source) {
			if ($source->canWrite()) {
			$source->setKeys($keys);
			return;
			}
			}

			// We can't write; this will throw an appropriate exception.
			parent::setKeys($keys);
			}

			public function deleteKeys(array $keys) {
			foreach ($this->stack as $source) {
			if ($source->canWrite()) {
			$source->deleteKeys($keys);
			return;
			}
			}

			// We can't write; this will throw an appropriate exception.
			parent::deleteKeys($keys);
			}

			}