org.spearce.jgit/src/org/spearce/jgit/util/FS_Win32_Cygwin.java

   1 /*
   2  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
   3  *
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or
   7  * without modification, are permitted provided that the following
   8  * conditions are met:
   9  *
  10  * - Redistributions of source code must retain the above copyright
  11  *   notice, this list of conditions and the following disclaimer.
  12  *
  13  * - Redistributions in binary form must reproduce the above
  14  *   copyright notice, this list of conditions and the following
  15  *   disclaimer in the documentation and/or other materials provided
  16  *   with the distribution.
  17  *
  18  * - Neither the name of the Git Development Community nor the
  19  *   names of its contributors may be used to endorse or promote
  20  *   products derived from this software without specific prior
  21  *   written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  24  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  25  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  28  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  31  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  32  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  33  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  35  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 package org.spearce.jgit.util;
  39
  40 import java.io.BufferedReader;
  41 import java.io.File;
  42 import java.io.IOException;
  43 import java.io.InputStreamReader;
  44 import java.security.AccessController;
  45 import java.security.PrivilegedAction;
  46
  47 class FS_Win32_Cygwin extends FS_Win32 {
  48         private static String cygpath;
  49
  50         static boolean detect() {
  51                 final String path = AccessController
  52                                 .doPrivileged(new PrivilegedAction<String>() {
  53                                         public String run() {
  54                                                 return System.getProperty("java.library.path");
  55                                         }
  56                                 });
  57                 if (path == null)
  58                         return false;
  59                 for (final String p : path.split(";")) {
  60                         final File e = new File(p, "cygpath.exe");
  61                         if (e.isFile()) {
  62                                 cygpath = e.getAbsolutePath();
  63                                 return true;
  64                         }
  65                 }
  66                 return false;
  67         }
  68
  69         protected File resolveImpl(final File dir, final String pn) {
  70                 try {
  71                         final Process p;
  72
  73                         p = Runtime.getRuntime().exec(
  74                                         new String[] { cygpath, "--windows", "--absolute", pn },
  75                                         null, dir);
  76                         p.getOutputStream().close();
  77
  78                         final BufferedReader lineRead = new BufferedReader(
  79                                         new InputStreamReader(p.getInputStream(), "UTF-8"));
  80                         String r = null;
  81                         try {
  82                                 r = lineRead.readLine();
  83                         } finally {
  84                                 lineRead.close();
  85                         }
  86
  87                         for (;;) {
  88                                 try {
  89                                         if (p.waitFor() == 0 && r != null && r.length() > 0)
  90                                                 return new File(r);
  91                                         break;
  92                                 } catch (InterruptedException ie) {
  93                                         // Stop bothering me, I have a zombie to reap.
  94                                 }
  95                         }
  96                 } catch (IOException ioe) {
  97                         // Fall through and use the default return.
  98                         //
  99                 }
 100                 return super.resolveImpl(dir, pn);
 101         }
 102
 103         @Override
 104         protected File userHomeImpl() {
 105                 final String home = AccessController
 106                                 .doPrivileged(new PrivilegedAction<String>() {
 107                                         public String run() {
 108                                                 return System.getenv("HOME");
 109                                         }
 110                                 });
 111                 if (home == null || home.length() == 0)
 112                         return super.userHomeImpl();
 113                 return resolveImpl(new File("."), home);
 114         }
 115 }