<?php

include_once 'bu-common.php';


function btn_run_bu( $buid, $testrun='true' ){
	
	//we cannot fork using php inside apache for some stupid reason.
	//so we need to deligate a fork to an external process. 
	//BASH can do this with the background '&' command, so we use it.

	global $g_phpcli_path;

	$output = array();
	$result_code = null;	
	$bIsTest = $testrun=='true';
	
	if(!$bIsTest) $str_test = '0 &';
	else $str_test = '1';

	// get realpath, cos this is what is specified in visudo:
	//www-data ALL=(ALL) NOPASSWD: /usr/bin/php /var/www/html/bin/run-bu-by-id.php *	
	$path_to_script = realpath(__DIR__."/../bin/run-bu-by-id.php");
	$command = "sudo $g_phpcli_path $path_to_script $buid $str_test 2>&1";

	//error_log("btn_run_bu to execute cmd: $command");
	
	if( exec( $command, $output, $result_code )===FALSE){
		error_log( "exec to php-cli failed - command: $command");
		return array('error', "exec to php-cli failed - command: $command" );
	}

	//error_log( print_r($output,true) );

	//even though the script ran, it may have echoed errors to the console. We test here.
	if( count($output)>0 ){
		if( substr( $output[0], 0, 6) == 'Error:' ){
			error_log( $output[0] );
			return array('error', $output[0] );
		}		
	}	
	
	if($testrun!='false'){
		//a test run waits for the command to finish, so the output can be collected and sent back now
		for($i=0;$i<2;$i++){
			$fn = __DIR__."/../data/".getFilename_out( $buid, $bIsTest, $i==0 );
			$output[] = file_get_contents($fn);
		}

		return array_merge( array('done'), $output );
	}
	
	//error_log( "Backup kicked off for ID($buid): isTest=$isTest");
	
	return array_merge( array('running'), $output );
}


?>