	public function ExpandHash($project, $abbrevHash)
	{
		if (!$project)
			return $abbrevHash;

		if (!(preg_match('/[0-9A-Fa-f]{4,39}/', $abbrevHash))) {
			return $abbrevHash;
		}

		$args = array();
		$args[] = '-1';
		$args[] = '--format=format:%H';
		$args[] = $abbrevHash;

		$fullData = explode("\n", $this->exe->Execute($project->GetPath(), GIT_REV_LIST, $args));
		if (empty($fullData[0])) {
			return $abbrevHash;
		}
		if (substr_compare(trim($fullData[0]), 'commit', 0, 6) !== 0) {
			return $abbrevHash;
		}

		if (empty($fullData[1])) {
			return $abbrevHash;
		}

		return trim($fullData[1]);
	}
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.