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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>1.1. 项目背景</title>
<link rel="stylesheet" href="/stylesheets/master.css" type="text/css">
<link rel="stylesheet" href="/stylesheets/syntax.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.72.0">
<link rel="start" href="index.html" title="敏捷 Web 开发实践">
<link rel="up" href="psm.preface.html" title="1. 前言">
<link rel="prev" href="psm.preface.html" title="1. 前言">
<link rel="next" href="psm.preface.implement.html" title="1.2. 最终的实现">
</head>
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<script language="javascript" type="text/javascript" src="/docbook/includes/js/header.js"></script><script language="javascript"> write_header("/docbook"); </script><div class="navheader">
<table width="100%" summary="Navigation header">
<tr><th colspan="3" align="center">1.1. 项目背景</th></tr>
<tr>
<td width="20%" align="left">
<a accesskey="p" href="psm.preface.html"><img src="/docbook/includes/images/docbook/prev.png" alt="上一页"></a> </td>
<th width="60%" align="center">1. 前言</th>
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<div class="sect2" lang="zh-cn">
<div class="titlepage"><div><div><h3 class="title">
<a name="psm.preface.background"></a>1.1. 项目背景</h3></div></div></div>
<p>Subversion使用配置文件进行基于路径的授权，手工配置易于出错。
下面是一个错误百出的配置示例：</p>
<pre class="programlisting">
[groups]
admin = &admin, admin1, admin2
group1 = @group2, user1
group2 = user2, @group1
[aliases]
admin = jiangxin
[/]
@admin = rw
[/trunk]
$authenticated = rw
[repos1:/]
* =
user1 =
@group1 = r
@admin = rw
[repos1:/trunk/src]
* =
@group1 = rw
@visiters = r
</pre>
<p>其中的错误或可能的错误有：</p>
<div class="orderedlist"><ol type="1">
<li><p><span class="emphasis"><em>组的循环引用：</em></span>
group1包含了group2，而group2又反过来包含group1，造成循环引用。</p></li>
<li><p><span class="emphasis"><em>包含未定义的组或者别名：</em></span>
例如在 repos1 版本库的 /trunk/src 的策略中用到了 @visiters 组，
而该组没有在[groups]小节中定义；</p></li>
<li><p><span class="emphasis"><em>潜在的配置错误：</em></span>
版本库repos1的根路径，欲限制user1的访问，而实际效果并非如此，
因为uer1属于group1组，而group1组被授权。user1实际获得的权限是策略能够给予
的最大权限；</p></li>
<li><p><span class="emphasis"><em>潜在的配置错误：</em></span>
访问版本库repos1的 /trunk 目录，会参照缺省的[/trunk]小节设置，
这可能跟管理员本意不符。需要对repos1的/trunk重新定义权限以覆盖缺省的
[/trunk]小节的设置。</p></li>
</ol></div>
<p>其中1和2的错误会造成Subversion服务中断故障！3和4的问题如果不经过测试很难发现！
在我们为客户实施Subversion技术支持服务过程中，发现了用户迫切需要容错性强的
授权管理工具，于是便有了开发图形化管理界面的打算。选择 Python 是因为 Python
语言的魅力以及 Python 开发过程的高效。</p>
</div>
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<col width="33%">
<col width="33%">
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<tr>
<td></td>
<td align="center" valign="center"></td>
<td align="right" valign="center"><p class="copyright">
Copyright © 2006 <a href="http://www.worldhello.net/doc/"><b>WorldHello 开放文档之源</b> 计划</a></p></td>
</tr>
</table>
<div class="navfooter">
<hr>
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<tr>
<td width="40%" align="left">
<a accesskey="p" href="psm.preface.html"><img src="/docbook/includes/images/docbook/prev.png" alt="上一页"></a> </td>
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</td>
</tr>
<tr>
<td width="40%" align="left" valign="top">1. 前言 </td>
<td width="20%" align="center"><a accesskey="h" href="index.html"><img src="/docbook/includes/images/docbook/home.png" alt="首页"></a></td>
<td width="40%" align="right" valign="top"> 1.2. 最终的实现</td>
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