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|
<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Tomas V.V.Cox <cox@idecnet.com> |
// | Stig Bakken <ssb@fast.no> |
// | |
// +----------------------------------------------------------------------+
//
// $Id$
/**
* Methods for dependencies check. Based on Stig's dependencies RFC
* at http://cvs.php.net/cvs.php/pearweb/rfc
* (requires php >= 4.1)
*/
require_once "PEAR.php";
class PEAR_Dependency
{
/**
* This method maps the xml dependency definition to the
* PEAR_dependecy one
*
* $opts => Array
* (
* [type] => pkg
* [rel] => ge
* [version] => 3.4
* [name] => HTML_Common
* )
*/
function callCheckMethod($opts)
{
$rel = isset($opts['rel']) ? $opts['rel'] : 'has';
if (isset($opts['version'])) {
$req = $opts['version'];
$rel = 'v.' . $rel;
} else {
$req = null;
}
$name = isset($opts['name']) ? $opts['name'] : null;
switch ($opts['type']) {
case 'pkg':
return $this->checkPackage($name, $req, $rel);
break;
case 'ext':
return $this->checkExtension($name, $req, $rel);
break;
case 'php':
return $this->checkPHP($req, $rel);
break;
case 'prog':
return $this->checkProgram($name);
break;
case 'os':
return $this->checkOS($name);
break;
case 'sapi':
return $this->checkSAPI($name);
break;
default:
return "'{$opts['type']}' dependencie type not supported";
}
}
/**
* Package dependencies check method
*
* @param string $name Name of the package to test
* @param string $version The package version required
* @param string $relation How to compare versions with eachother
*
* @return mixed bool false if no error or the error string
*/
function checkPackage($name, $req = null, $relation = 'has')
{
if (empty($this->registry)) {
$this->registry = new PEAR_Registry;
}
if (!$this->registry->packageExists($name)) {
return "'$name' PEAR package is not installed";
}
if (substr($relation, 0, 2) == 'v.') {
$pkg_ver = $this->registry->packageInfo($name, 'version');
$operator = substr($relation, 2);
if (!version_compare($pkg_ver, $req, $operator)) {
return "'$name' PEAR package version " .
$this->signOperator($operator) . " $req is required";
}
return false;
}
return "Relation '$relation' with requirement '$req' is not supported";
}
/**
* Extension dependencies check method
*
* @param string $name Name of the extension to test
* @param string $req_ext_ver Required extension version to compare with
* @param string $relation How to compare versions with eachother
*
* @return mixed bool false if no error or the error string
*/
function checkExtension($name, $req = null, $relation = 'has')
{
// XXX (ssb): could we avoid loading the extension here?
if (!extension_loaded($name)) {
$dlext = OS_WINDOWS ? '.dll' : '.so';
if (!@dl($name . $dlext)) {
return "'$name' PHP extension is not installed";
}
}
if ($relation == 'has') {
return false;
}
if (substr($relation, 0, 2) == 'v.') {
$ext_ver = phpversion($name);
$operator = substr($relation, 2);
if (!version_compare($ext_ver, $req, $operator)) {
return "'$name' PHP extension version " .
$this->signOperator($operator) . " $req is required";
}
}
return false;
}
/**
* Operating system dependencies check method
*
* @param string $os Name of the operating system
*
* @return mixed bool false if no error or the error string
*/
function checkOS($os)
{
// XXX Fixme: Implement a more flexible way, like
// comma separated values or something similar to PEAR_OS
// only 'has' relation is supported
if ($os == PHP_OS) {
return false;
}
return "'$os' operating system not supported";
}
/**
* PHP version check method
*
* @param string $req which version to compare
* @param string $relation how to compare the version
*
* @return mixed bool false if no error or the error string
*/
function checkPHP($req, $relation = 'v.ge')
{
if (substr($relation, 0, 2) == 'v.') {
$php_ver = phpversion();
$operator = substr($relation, 2);
if (!version_compare($php_ver, $req, $operator)) {
return "PHP version " . $this->signOperator($operator) .
" $req is required";
}
}
return false;
}
/**
* External program check method. Looks for executable files in
* directories listed in the PATH environment variable.
*
* @param string $program which program to look for
*
* @return mixed bool false if no error or the error string
*/
function checkProgram($program)
{
// XXX FIXME honor safe mode
$path_delim = OS_WINDOWS ? ';' : ':';
$exe_suffix = OS_WINDOWS ? '.exe' : '';
$path_elements = explode($path_delim, getenv('PATH'));
foreach ($path_elements as $dir) {
$file = $dir . DIRECTORY_SEPARATOR . $program . $exe_suffix;
if (@file_exists($file) && @is_executable($file)) {
return false;
}
}
return "'$program' program is not present in the PATH";
}
/**
* SAPI backend check method. Version comparison is not yet
* available here.
*
* @param string $name name of SAPI backend
* @param string $req which version to compare
* @param string $relation how to compare versions (currently
* hardcoded to 'has')
* @return mixed bool false if no error or the error string
*/
function checkSAPI($name, $req = null, $relation = 'has')
{
// XXX Fixme: There is no way to know if the user has or
// not other SAPI backends installed than the installer one
$sapi_backend = php_sapi_name();
// Version comparisons not supported, sapi backends don't have
// version information yet.
if ($sapi_backend == $name) {
return false;
}
return "'$sapi_backend' SAPI backend not supported";
}
/**
* Converts text comparing operators to them sign equivalents
* ex: 'ge' to '>='
*/
function signOperator($operator)
{
switch($operator) {
case 'lt': return '<';
case 'le': return '<=';
case 'gt': return '>';
case 'ge': return '>=';
case 'eq': return '==';
case 'ne': return '!=';
default:
return $operator;
}
}
}
?>
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