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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-2"></a><span class='hs-comment'>{- arch-tag: HVFS Combinators
<a name="line-3"></a>Copyright (C) 2004-2005 John Goerzen <jgoerzen@complete.org>
<a name="line-4"></a>
<a name="line-5"></a>This program is free software; you can redistribute it and/or modify
<a name="line-6"></a>it under the terms of the GNU General Public License as published by
<a name="line-7"></a>the Free Software Foundation; either version 2 of the License, or
<a name="line-8"></a>(at your option) any later version.
<a name="line-9"></a>
<a name="line-10"></a>This program is distributed in the hope that it will be useful,
<a name="line-11"></a>but WITHOUT ANY WARRANTY; without even the implied warranty of
<a name="line-12"></a>MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
<a name="line-13"></a>GNU General Public License for more details.
<a name="line-14"></a>
<a name="line-15"></a>You should have received a copy of the GNU General Public License
<a name="line-16"></a>along with this program; if not, write to the Free Software
<a name="line-17"></a>Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
<a name="line-18"></a>-}</span>
<a name="line-19"></a><span class='hs-comment'>{- |
<a name="line-20"></a> Module : System.IO.HVFS.Combinators
<a name="line-21"></a> Copyright : Copyright (C) 2004-2005 John Goerzen
<a name="line-22"></a> License : GNU GPL, version 2 or above
<a name="line-23"></a>
<a name="line-24"></a> Maintainer : John Goerzen <jgoerzen@complete.org>
<a name="line-25"></a> Stability : provisional
<a name="line-26"></a> Portability: portable
<a name="line-27"></a>
<a name="line-28"></a>Support for combining different HVFS modules together
<a name="line-29"></a>
<a name="line-30"></a>Copyright (c) 2004-2005 John Goerzen, jgoerzen\@complete.org
<a name="line-31"></a>
<a name="line-32"></a>-}</span>
<a name="line-33"></a>
<a name="line-34"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>HVFS</span><span class='hs-varop'>.</span><span class='hs-conid'>Combinators</span> <span class='hs-layout'>(</span> <span class='hs-comment'>-- * Restrictions</span>
<a name="line-35"></a> <span class='hs-conid'>HVFSReadOnly</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-36"></a> <span class='hs-conid'>HVFSChroot</span><span class='hs-layout'>,</span> <span class='hs-varid'>newHVFSChroot</span><span class='hs-layout'>)</span>
<a name="line-37"></a> <span class='hs-keyword'>where</span>
<a name="line-38"></a>
<a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span>
<a name="line-40"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span>
<a name="line-41"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>HVFS</span>
<a name="line-42"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>HVFS</span><span class='hs-varop'>.</span><span class='hs-conid'>InstanceHelpers</span> <span class='hs-layout'>(</span><span class='hs-varid'>getFullPath</span><span class='hs-layout'>)</span>
<a name="line-43"></a><span class='hs-cpp'>#if !(defined(mingw32_HOST_OS) || defined(mingw32_TARGET_OS) || defined(__MINGW32__))</span>
<a name="line-44"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Posix</span><span class='hs-varop'>.</span><span class='hs-conid'>Files</span> <span class='hs-comment'>-- This actually needed? -Wall doesn't seem to think</span>
<a name="line-45"></a> <span class='hs-comment'>-- so, but I'm not sure...</span>
<a name="line-46"></a><span class='hs-cpp'>#endif</span>
<a name="line-47"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Path</span> <span class='hs-layout'>(</span><span class='hs-varid'>secureAbsNormPath</span><span class='hs-layout'>)</span>
<a name="line-48"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Path</span><span class='hs-varop'>.</span><span class='hs-conid'>NameManip</span> <span class='hs-layout'>(</span><span class='hs-varid'>normalise_path</span><span class='hs-layout'>)</span>
<a name="line-49"></a>
<a name="line-50"></a><a name="HVFSReadOnly"></a><span class='hs-comment'>----------------------------------------------------------------------</span>
<a name="line-51"></a><a name="HVFSReadOnly"></a><span class='hs-comment'>-- Providing read-only access</span>
<a name="line-52"></a><a name="HVFSReadOnly"></a><span class='hs-comment'>----------------------------------------------------------------------</span>
<a name="line-53"></a><a name="HVFSReadOnly"></a><span class='hs-comment'>{- | Restrict access to the underlying filesystem to be strictly
<a name="line-54"></a>read-only. Any write-type operations will cause an error.
<a name="line-55"></a>
<a name="line-56"></a>No constructor is required; just say @HVFSReadOnly fs@ to make a
<a name="line-57"></a>new read-only wrapper around the 'HVFS' instance @fs@.
<a name="line-58"></a>-}</span>
<a name="line-59"></a><a name="HVFSReadOnly"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>HVFS</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>HVFSReadOnly</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>HVFSReadOnly</span> <span class='hs-varid'>a</span>
<a name="line-60"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-61"></a><a name="withro"></a><span class='hs-definition'>withro</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HVFS</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HVFSReadOnly</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-62"></a><span class='hs-definition'>withro</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>HVFSReadOnly</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span>
<a name="line-63"></a>
<a name="line-64"></a><a name="roerror"></a><span class='hs-definition'>roerror</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>HVFS</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>HVFSReadOnly</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>c</span>
<a name="line-65"></a><span class='hs-definition'>roerror</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span>
<a name="line-66"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>err</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>vRaiseError</span> <span class='hs-varid'>x</span> <span class='hs-varid'>permissionErrorType</span> <span class='hs-str'>"Read-only virtual filesystem"</span>
<a name="line-67"></a> <span class='hs-conid'>Nothing</span>
<a name="line-68"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>withro</span> <span class='hs-varid'>err</span> <span class='hs-varid'>h</span>
<a name="line-69"></a>
<a name="line-70"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>HVFS</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>HVFS</span> <span class='hs-layout'>(</span><span class='hs-conid'>HVFSReadOnly</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-71"></a> <span class='hs-varid'>vGetCurrentDirectory</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withro</span> <span class='hs-varid'>vGetCurrentDirectory</span>
<a name="line-72"></a> <span class='hs-varid'>vSetCurrentDirectory</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withro</span> <span class='hs-varid'>vSetCurrentDirectory</span>
<a name="line-73"></a> <span class='hs-varid'>vGetDirectoryContents</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withro</span> <span class='hs-varid'>vGetDirectoryContents</span>
<a name="line-74"></a> <span class='hs-varid'>vDoesFileExist</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withro</span> <span class='hs-varid'>vDoesFileExist</span>
<a name="line-75"></a> <span class='hs-varid'>vDoesDirectoryExist</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withro</span> <span class='hs-varid'>vDoesDirectoryExist</span>
<a name="line-76"></a> <span class='hs-varid'>vCreateDirectory</span> <span class='hs-varid'>h</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>roerror</span> <span class='hs-varid'>h</span>
<a name="line-77"></a> <span class='hs-varid'>vRemoveDirectory</span> <span class='hs-varid'>h</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>roerror</span> <span class='hs-varid'>h</span>
<a name="line-78"></a> <span class='hs-varid'>vRenameDirectory</span> <span class='hs-varid'>h</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>roerror</span> <span class='hs-varid'>h</span>
<a name="line-79"></a> <span class='hs-varid'>vRenameFile</span> <span class='hs-varid'>h</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>roerror</span> <span class='hs-varid'>h</span>
<a name="line-80"></a> <span class='hs-varid'>vGetFileStatus</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withro</span> <span class='hs-varid'>vGetFileStatus</span>
<a name="line-81"></a> <span class='hs-varid'>vGetSymbolicLinkStatus</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withro</span> <span class='hs-varid'>vGetSymbolicLinkStatus</span>
<a name="line-82"></a> <span class='hs-varid'>vGetModificationTime</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withro</span> <span class='hs-varid'>vGetModificationTime</span>
<a name="line-83"></a> <span class='hs-varid'>vRaiseError</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withro</span> <span class='hs-varid'>vRaiseError</span>
<a name="line-84"></a> <span class='hs-varid'>vCreateSymbolicLink</span> <span class='hs-varid'>h</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>roerror</span> <span class='hs-varid'>h</span>
<a name="line-85"></a> <span class='hs-varid'>vReadSymbolicLink</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withro</span> <span class='hs-varid'>vReadSymbolicLink</span>
<a name="line-86"></a> <span class='hs-varid'>vCreateLink</span> <span class='hs-varid'>h</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>roerror</span> <span class='hs-varid'>h</span>
<a name="line-87"></a>
<a name="line-88"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>HVFSOpenable</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>HVFSOpenable</span> <span class='hs-layout'>(</span><span class='hs-conid'>HVFSReadOnly</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-89"></a> <span class='hs-varid'>vOpen</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>fp</span> <span class='hs-varid'>mode</span> <span class='hs-keyglyph'>=</span>
<a name="line-90"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>mode</span> <span class='hs-keyword'>of</span> <span class='hs-conid'>ReadMode</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>withro</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>h</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>vOpen</span> <span class='hs-varid'>h</span> <span class='hs-varid'>fp</span> <span class='hs-varid'>mode</span><span class='hs-layout'>)</span> <span class='hs-varid'>fh</span>
<a name="line-91"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>roerror</span> <span class='hs-varid'>fh</span>
<a name="line-92"></a>
<a name="line-93"></a><a name="HVFSChroot"></a><span class='hs-comment'>----------------------------------------------------------------------</span>
<a name="line-94"></a><a name="HVFSChroot"></a><span class='hs-comment'>-- Restricting to a subdirectory</span>
<a name="line-95"></a><a name="HVFSChroot"></a><span class='hs-comment'>----------------------------------------------------------------------</span>
<a name="line-96"></a><a name="HVFSChroot"></a><span class='hs-comment'>{- | Access a subdirectory of a real filesystem as if it was the root
<a name="line-97"></a>of that filesystem. -}</span>
<a name="line-98"></a><a name="HVFSChroot"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>HVFS</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>HVFSChroot</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>HVFSChroot</span> <span class='hs-conid'>String</span> <span class='hs-varid'>a</span>
<a name="line-99"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-100"></a>
<a name="line-101"></a><a name="newHVFSChroot"></a><span class='hs-comment'>{- | Create a new 'HVFSChroot' object. -}</span>
<a name="line-102"></a><span class='hs-definition'>newHVFSChroot</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HVFS</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ The object to pass requests on to</span>
<a name="line-103"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FilePath</span> <span class='hs-comment'>-- ^ The path of the directory to make root</span>
<a name="line-104"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>HVFSChroot</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ The resulting new object</span>
<a name="line-105"></a><span class='hs-definition'>newHVFSChroot</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>fp</span> <span class='hs-keyglyph'>=</span>
<a name="line-106"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>full</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getFullPath</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>fp</span>
<a name="line-107"></a> <span class='hs-varid'>isdir</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>vDoesDirectoryExist</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>full</span>
<a name="line-108"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>isdir</span>
<a name="line-109"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>newobj</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>HVFSChroot</span> <span class='hs-varid'>full</span> <span class='hs-varid'>fh</span><span class='hs-layout'>)</span>
<a name="line-110"></a> <span class='hs-varid'>vSetCurrentDirectory</span> <span class='hs-varid'>newobj</span> <span class='hs-str'>"/"</span>
<a name="line-111"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>newobj</span>
<a name="line-112"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>vRaiseError</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>doesNotExistErrorType</span>
<a name="line-113"></a> <span class='hs-layout'>(</span><span class='hs-str'>"Attempt to instantiate HVFSChroot over non-directory "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>full</span><span class='hs-layout'>)</span>
<a name="line-114"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>full</span><span class='hs-layout'>)</span>
<a name="line-115"></a>
<a name="line-116"></a><a name="dch"></a><span class='hs-comment'>{- | Get the embedded object -}</span>
<a name="line-117"></a><span class='hs-definition'>dch</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>HVFS</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>HVFSChroot</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span>
<a name="line-118"></a><span class='hs-definition'>dch</span> <span class='hs-layout'>(</span><span class='hs-conid'>HVFSChroot</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-119"></a>
<a name="line-120"></a><a name="dch2fp"></a><span class='hs-comment'>{- | Convert a local (chroot) path to a full path. -}</span>
<a name="line-121"></a><span class='hs-definition'>dch2fp</span><span class='hs-layout'>,</span> <span class='hs-varid'>fp2dch</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>HVFS</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>HVFSChroot</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span>
<a name="line-122"></a><span class='hs-definition'>dch2fp</span> <span class='hs-varid'>mainh</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>HVFSChroot</span> <span class='hs-varid'>fp</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span> <span class='hs-varid'>locfp</span> <span class='hs-keyglyph'>=</span>
<a name="line-123"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>full</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>case</span> <span class='hs-layout'>(</span><span class='hs-varid'>head</span> <span class='hs-varid'>locfp</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-124"></a> <span class='hs-chr'>'/'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>fp</span> <span class='hs-varop'>++</span> <span class='hs-varid'>locfp</span><span class='hs-layout'>)</span>
<a name="line-125"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getFullPath</span> <span class='hs-varid'>mainh</span> <span class='hs-varid'>locfp</span>
<a name="line-126"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fp</span> <span class='hs-varop'>++</span> <span class='hs-varid'>y</span>
<a name="line-127"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>secureAbsNormPath</span> <span class='hs-varid'>fp</span> <span class='hs-varid'>full</span> <span class='hs-keyword'>of</span>
<a name="line-128"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>vRaiseError</span> <span class='hs-varid'>h</span> <span class='hs-varid'>doesNotExistErrorType</span>
<a name="line-129"></a> <span class='hs-layout'>(</span><span class='hs-str'>"Trouble normalizing path in chroot"</span><span class='hs-layout'>)</span>
<a name="line-130"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>fp</span> <span class='hs-varop'>++</span> <span class='hs-str'>","</span> <span class='hs-varop'>++</span> <span class='hs-varid'>full</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-131"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span>
<a name="line-132"></a>
<a name="line-133"></a><a name="fp2dch"></a><span class='hs-comment'>{- | Convert a full path to a local (chroot) path. -}</span>
<a name="line-134"></a><span class='hs-definition'>fp2dch</span> <span class='hs-layout'>(</span><span class='hs-conid'>HVFSChroot</span> <span class='hs-varid'>fp</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span> <span class='hs-varid'>locfp</span> <span class='hs-keyglyph'>=</span>
<a name="line-135"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>newpath</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>secureAbsNormPath</span> <span class='hs-varid'>fp</span> <span class='hs-varid'>locfp</span> <span class='hs-keyword'>of</span>
<a name="line-136"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>vRaiseError</span> <span class='hs-varid'>h</span> <span class='hs-varid'>doesNotExistErrorType</span>
<a name="line-137"></a> <span class='hs-layout'>(</span><span class='hs-str'>"Unable to securely normalize path"</span><span class='hs-layout'>)</span>
<a name="line-138"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>fp</span> <span class='hs-varop'>++</span> <span class='hs-str'>"/"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>locfp</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-139"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span>
<a name="line-140"></a> <span class='hs-keyword'>if</span> <span class='hs-layout'>(</span><span class='hs-varid'>take</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varid'>fp</span><span class='hs-layout'>)</span> <span class='hs-varid'>newpath</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>fp</span><span class='hs-layout'>)</span>
<a name="line-141"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>vRaiseError</span> <span class='hs-varid'>h</span> <span class='hs-varid'>doesNotExistErrorType</span>
<a name="line-142"></a> <span class='hs-layout'>(</span><span class='hs-str'>"Local path is not subdirectory of parent path"</span><span class='hs-layout'>)</span>
<a name="line-143"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>newpath</span><span class='hs-layout'>)</span>
<a name="line-144"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>newpath2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>drop</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varid'>fp</span><span class='hs-layout'>)</span> <span class='hs-varid'>newpath</span>
<a name="line-145"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>normalise_path</span> <span class='hs-layout'>(</span><span class='hs-str'>"/"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>newpath2</span><span class='hs-layout'>)</span>
<a name="line-146"></a>
<a name="line-147"></a><a name="dch2fph"></a><span class='hs-definition'>dch2fph</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>HVFS</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>t1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HVFSChroot</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>t1</span>
<a name="line-148"></a><span class='hs-definition'>dch2fph</span> <span class='hs-varid'>func</span> <span class='hs-varid'>fh</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>HVFSChroot</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span> <span class='hs-varid'>locfp</span> <span class='hs-keyglyph'>=</span>
<a name="line-149"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>newfp</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>dch2fp</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>locfp</span>
<a name="line-150"></a> <span class='hs-varid'>func</span> <span class='hs-varid'>h</span> <span class='hs-varid'>newfp</span>
<a name="line-151"></a>
<a name="line-152"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>HVFS</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>HVFS</span> <span class='hs-layout'>(</span><span class='hs-conid'>HVFSChroot</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-153"></a> <span class='hs-varid'>vGetCurrentDirectory</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>fp</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>vGetCurrentDirectory</span> <span class='hs-layout'>(</span><span class='hs-varid'>dch</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-154"></a> <span class='hs-varid'>fp2dch</span> <span class='hs-varid'>x</span> <span class='hs-varid'>fp</span>
<a name="line-155"></a> <span class='hs-varid'>vSetCurrentDirectory</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dch2fph</span> <span class='hs-varid'>vSetCurrentDirectory</span>
<a name="line-156"></a> <span class='hs-varid'>vGetDirectoryContents</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dch2fph</span> <span class='hs-varid'>vGetDirectoryContents</span>
<a name="line-157"></a> <span class='hs-varid'>vDoesFileExist</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dch2fph</span> <span class='hs-varid'>vDoesFileExist</span>
<a name="line-158"></a> <span class='hs-varid'>vDoesDirectoryExist</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dch2fph</span> <span class='hs-varid'>vDoesDirectoryExist</span>
<a name="line-159"></a> <span class='hs-varid'>vCreateDirectory</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dch2fph</span> <span class='hs-varid'>vCreateDirectory</span>
<a name="line-160"></a> <span class='hs-varid'>vRemoveDirectory</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dch2fph</span> <span class='hs-varid'>vRemoveDirectory</span>
<a name="line-161"></a> <span class='hs-varid'>vRenameDirectory</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>old</span> <span class='hs-varid'>new</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>old'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>dch2fp</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>old</span>
<a name="line-162"></a> <span class='hs-varid'>new'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>dch2fp</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>new</span>
<a name="line-163"></a> <span class='hs-varid'>vRenameDirectory</span> <span class='hs-layout'>(</span><span class='hs-varid'>dch</span> <span class='hs-varid'>fh</span><span class='hs-layout'>)</span> <span class='hs-varid'>old'</span> <span class='hs-varid'>new'</span>
<a name="line-164"></a> <span class='hs-varid'>vRemoveFile</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dch2fph</span> <span class='hs-varid'>vRemoveFile</span>
<a name="line-165"></a> <span class='hs-varid'>vRenameFile</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>old</span> <span class='hs-varid'>new</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>old'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>dch2fp</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>old</span>
<a name="line-166"></a> <span class='hs-varid'>new'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>dch2fp</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>new</span>
<a name="line-167"></a> <span class='hs-varid'>vRenameFile</span> <span class='hs-layout'>(</span><span class='hs-varid'>dch</span> <span class='hs-varid'>fh</span><span class='hs-layout'>)</span> <span class='hs-varid'>old'</span> <span class='hs-varid'>new'</span>
<a name="line-168"></a> <span class='hs-varid'>vGetFileStatus</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dch2fph</span> <span class='hs-varid'>vGetFileStatus</span>
<a name="line-169"></a> <span class='hs-varid'>vGetSymbolicLinkStatus</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dch2fph</span> <span class='hs-varid'>vGetSymbolicLinkStatus</span>
<a name="line-170"></a> <span class='hs-varid'>vGetModificationTime</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dch2fph</span> <span class='hs-varid'>vGetModificationTime</span>
<a name="line-171"></a> <span class='hs-comment'>-- vRaiseError</span>
<a name="line-172"></a> <span class='hs-varid'>vCreateSymbolicLink</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>old</span> <span class='hs-varid'>new</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>old'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>dch2fp</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>old</span>
<a name="line-173"></a> <span class='hs-varid'>new'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>dch2fp</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>new</span>
<a name="line-174"></a> <span class='hs-varid'>vCreateSymbolicLink</span> <span class='hs-layout'>(</span><span class='hs-varid'>dch</span> <span class='hs-varid'>fh</span><span class='hs-layout'>)</span> <span class='hs-varid'>old'</span> <span class='hs-varid'>new'</span>
<a name="line-175"></a> <span class='hs-varid'>vReadSymbolicLink</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>fp</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>result</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>dch2fph</span> <span class='hs-varid'>vReadSymbolicLink</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>fp</span>
<a name="line-176"></a> <span class='hs-varid'>fp2dch</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>result</span>
<a name="line-177"></a> <span class='hs-varid'>vCreateLink</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>old</span> <span class='hs-varid'>new</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>old'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>dch2fp</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>old</span>
<a name="line-178"></a> <span class='hs-varid'>new'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>dch2fp</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>new</span>
<a name="line-179"></a> <span class='hs-varid'>vCreateLink</span> <span class='hs-layout'>(</span><span class='hs-varid'>dch</span> <span class='hs-varid'>fh</span><span class='hs-layout'>)</span> <span class='hs-varid'>old'</span> <span class='hs-varid'>new'</span>
<a name="line-180"></a>
<a name="line-181"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>HVFSOpenable</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>HVFSOpenable</span> <span class='hs-layout'>(</span><span class='hs-conid'>HVFSChroot</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-182"></a> <span class='hs-varid'>vOpen</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>fp</span> <span class='hs-varid'>mode</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>newfile</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>dch2fp</span> <span class='hs-varid'>fh</span> <span class='hs-varid'>fp</span>
<a name="line-183"></a> <span class='hs-varid'>vOpen</span> <span class='hs-layout'>(</span><span class='hs-varid'>dch</span> <span class='hs-varid'>fh</span><span class='hs-layout'>)</span> <span class='hs-varid'>newfile</span> <span class='hs-varid'>mode</span>
</pre></body>
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