<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<!-- Generated by HsColour, http://www.cs.york.ac.uk/fp/darcs/hscolour/ -->
<title>src/Darcs/CheckFileSystem.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='hs-comment'>-- Copyright (C) 2004 David Roundy</span>
<a name="line-2"></a><span class='hs-comment'>--</span>
<a name="line-3"></a><span class='hs-comment'>-- This program is free software; you can redistribute it and/or modify</span>
<a name="line-4"></a><span class='hs-comment'>-- it under the terms of the GNU General Public License as published by</span>
<a name="line-5"></a><span class='hs-comment'>-- the Free Software Foundation; either version 2, or (at your option)</span>
<a name="line-6"></a><span class='hs-comment'>-- any later version.</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- This program is distributed in the hope that it will be useful,</span>
<a name="line-9"></a><span class='hs-comment'>-- but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="line-10"></a><span class='hs-comment'>-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="line-11"></a><span class='hs-comment'>-- GNU General Public License for more details.</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- You should have received a copy of the GNU General Public License</span>
<a name="line-14"></a><span class='hs-comment'>-- along with this program; see the file COPYING. If not, write to</span>
<a name="line-15"></a><span class='hs-comment'>-- the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,</span>
<a name="line-16"></a><span class='hs-comment'>-- Boston, MA 02110-1301, USA.</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>CheckFileSystem</span> <span class='hs-layout'>(</span> <span class='hs-varid'>can_I_use_mmap</span> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-19"></a>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Directory</span> <span class='hs-layout'>(</span> <span class='hs-varid'>removeFile</span><span class='hs-layout'>,</span> <span class='hs-varid'>removeDirectory</span><span class='hs-layout'>,</span> <span class='hs-varid'>setCurrentDirectory</span><span class='hs-layout'>,</span>
<a name="line-21"></a> <span class='hs-varid'>createDirectory</span><span class='hs-layout'>,</span>
<a name="line-22"></a> <span class='hs-layout'>)</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span> <span class='hs-varid'>block</span> <span class='hs-layout'>)</span>
<a name="line-24"></a>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span> <span class='hs-layout'>(</span> <span class='hs-varid'>withCurrentDirectory</span> <span class='hs-layout'>)</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Lock</span> <span class='hs-layout'>(</span> <span class='hs-varid'>withOpenTemp</span> <span class='hs-layout'>)</span>
<a name="line-27"></a>
<a name="line-28"></a><span class='hs-comment'>-- Beware that the below test will return true in any directory where we</span>
<a name="line-29"></a><span class='hs-comment'>-- don't have write permission. This is risky, but means we'll do the</span>
<a name="line-30"></a><span class='hs-comment'>-- right thing in the common case where we're dealing with posix</span>
<a name="line-31"></a><span class='hs-comment'>-- filesystems and directories in which we don't have permission to write.</span>
<a name="line-32"></a>
<a name="line-33"></a><a name="can_I_remove_open_files"></a><span class='hs-definition'>can_I_remove_open_files</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Bool</span>
<a name="line-34"></a><span class='hs-definition'>can_I_remove_open_files</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>block</span> <span class='hs-varop'>$</span>
<a name="line-35"></a> <span class='hs-layout'>(</span><span class='hs-varid'>withOpenTemp</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-36"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>removeFile</span> <span class='hs-varid'>f</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-varop'>`catch`</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span>
<a name="line-37"></a> <span class='hs-varop'>`catch`</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="can_I_remove_directories_holding_open_files"></a><span class='hs-definition'>can_I_remove_directories_holding_open_files</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Bool</span>
<a name="line-40"></a><span class='hs-definition'>can_I_remove_directories_holding_open_files</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>block</span> <span class='hs-varop'>$</span>
<a name="line-41"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span> <span class='hs-varid'>createDirectory</span> <span class='hs-str'>"darcs_testing_for_nfs"</span>
<a name="line-42"></a> <span class='hs-varid'>okay</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-varid'>withCurrentDirectory</span> <span class='hs-str'>"darcs_testing_for_nfs"</span> <span class='hs-varop'>$</span>
<a name="line-43"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>withOpenTemp</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-44"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span> <span class='hs-varid'>removeFile</span> <span class='hs-varid'>f</span>
<a name="line-45"></a> <span class='hs-varid'>setCurrentDirectory</span> <span class='hs-str'>".."</span>
<a name="line-46"></a> <span class='hs-varid'>removeDirectory</span> <span class='hs-str'>"darcs_testing_for_nfs"</span>
<a name="line-47"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
<a name="line-48"></a> <span class='hs-layout'>)</span> <span class='hs-varop'>`catch`</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span>
<a name="line-49"></a> <span class='hs-layout'>)</span> <span class='hs-varop'>`catch`</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
<a name="line-50"></a> <span class='hs-varid'>removeDirectory</span> <span class='hs-str'>"darcs_testing_for_nfs"</span> <span class='hs-varop'>`catch`</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-51"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>okay</span>
<a name="line-52"></a> <span class='hs-layout'>)</span> <span class='hs-varop'>`catch`</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
<a name="line-53"></a>
<a name="line-54"></a><a name="can_I_use_mmap"></a><span class='hs-definition'>can_I_use_mmap</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Bool</span>
<a name="line-55"></a><span class='hs-definition'>can_I_use_mmap</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>can_I_remove_open_files</span>
<a name="line-56"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>can_I_remove_directories_holding_open_files</span>
<a name="line-57"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span>
<a name="line-58"></a>
<a name="line-59"></a>
</pre></body>
</html>
