晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。 林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。 见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝) 既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。 南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。
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<?php
/**
* PEAR_Installer_Role_Cfg
*
* PHP versions 4 and 5
*
* @category pear
* @package PEAR
* @author Greg Beaver <cellog@php.net>
* @copyright 2007-2009 The Authors
* @license http://opensource.org/licenses/bsd-license.php New BSD License
* @link http://pear.php.net/package/PEAR
* @since File available since Release 1.7.0
*/
/**
* @category pear
* @package PEAR
* @author Greg Beaver <cellog@php.net>
* @copyright 2007-2009 The Authors
* @license http://opensource.org/licenses/bsd-license.php New BSD License
* @version Release: 1.10.16
* @link http://pear.php.net/package/PEAR
* @since Class available since Release 1.7.0
*/
class PEAR_Installer_Role_Cfg extends PEAR_Installer_Role_Common
{
/**
* @var PEAR_Installer
*/
var $installer;
/**
* the md5 of the original file
*
* @var unknown_type
*/
var $md5 = null;
/**
* Do any unusual setup here
* @param PEAR_Installer
* @param PEAR_PackageFile_v2
* @param array file attributes
* @param string file name
*/
function setup(&$installer, $pkg, $atts, $file)
{
$this->installer = &$installer;
$reg = &$this->installer->config->getRegistry();
$package = $reg->getPackage($pkg->getPackage(), $pkg->getChannel());
if ($package) {
$filelist = $package->getFilelist();
if (isset($filelist[$file]) && isset($filelist[$file]['md5sum'])) {
$this->md5 = $filelist[$file]['md5sum'];
}
}
}
function processInstallation($pkg, $atts, $file, $tmp_path, $layer = null)
{
$test = parent::processInstallation($pkg, $atts, $file, $tmp_path, $layer);
if (@file_exists($test[2]) && @file_exists($test[3])) {
$md5 = md5_file($test[2]);
// configuration has already been installed, check for mods
if ($md5 !== $this->md5 && $md5 !== md5_file($test[3])) {
// configuration has been modified, so save our version as
// configfile-version
$old = $test[2];
$test[2] .= '.new-' . $pkg->getVersion();
// backup original and re-install it
PEAR::pushErrorHandling(PEAR_ERROR_RETURN);
$tmpcfg = $this->config->get('temp_dir');
$newloc = System::mkdir(array('-p', $tmpcfg));
if (!$newloc) {
// try temp_dir
$newloc = System::mktemp(array('-d'));
if (!$newloc || PEAR::isError($newloc)) {
PEAR::popErrorHandling();
return PEAR::raiseError('Could not save existing configuration file '.
$old . ', unable to install. Please set temp_dir ' .
'configuration variable to a writeable location and try again');
}
} else {
$newloc = $tmpcfg;
}
$temp_file = $newloc . DIRECTORY_SEPARATOR . uniqid('savefile');
if (!@copy($old, $temp_file)) {
PEAR::popErrorHandling();
return PEAR::raiseError('Could not save existing configuration file '.
$old . ', unable to install. Please set temp_dir ' .
'configuration variable to a writeable location and try again');
}
PEAR::popErrorHandling();
$this->installer->log(0, "WARNING: configuration file $old is being installed as $test[2], you should manually merge in changes to the existing configuration file");
$this->installer->addFileOperation('rename', array($temp_file, $old, false));
$this->installer->addFileOperation('delete', array($temp_file));
}
}
return $test;
}
}