Equalize discoverGitPrefix() implementations between POSIX and Win32

Change-Id: I936df151890d4bba9079d79c65b75a69c209523b
Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>

org.eclipse.jgit/src/org/eclipse/jgit/util/FS_POSIX.java

@@ -141,16 +141,18 @@ public class FS_POSIX extends FS {
 			return resolveGrandparentFile(gitExe);
 
 		if (SystemReader.getInstance().isMacOS()) {
-			// On MacOSX, PATH is shorter when Eclipse is launched from the
-			// Finder than from a terminal. Therefore try to launch bash as a
-			// login shell and search using that.
-			//
-			String w = readPipe(userHome(), //
-					new String[] { "bash", "--login", "-c", "which git" }, // //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
-					Charset.defaultCharset().name());
-			if (w == null || w.length() == 0)
-				return null;
-			return resolveGrandparentFile(new File(w));
+			if (searchPath(path, "bash") != null) { //$NON-NLS-1$
+				// On MacOSX, PATH is shorter when Eclipse is launched from the
+				// Finder than from a terminal. Therefore try to launch bash as a
+				// login shell and search using that.
+				String w = readPipe(userHome(),
+						new String[] { "bash", "--login", "-c", "which git" }, // //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
+						Charset.defaultCharset().name());
+				if (w == null || w.length() == 0)
+					return null;
+				gitExe = new File(w);
+				return resolveGrandparentFile(gitExe);
+			}
 		}
 
 		return null;

org.eclipse.jgit/src/org/eclipse/jgit/util/FS_Win32.java

@@ -117,12 +117,12 @@ public class FS_Win32 extends FS {
 			String w = readPipe(userHome(),
 					new String[] { "bash", "--login", "-c", "which git" }, // //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
 					Charset.defaultCharset().name());
-			if (w != null) {
-				// The path may be in cygwin/msys notation so resolve it right away
-				gitExe = resolve(null, w);
-				if (gitExe != null)
-					return resolveGrandparentFile(gitExe);
-			}
+			if (w == null || w.length() == 0)
+				return null;
+			// The path may be in cygwin/msys notation so resolve it right away
+			gitExe = resolve(null, w);
+			if (gitExe != null)
+				return resolveGrandparentFile(gitExe);
 		}
 
 		return null;