FS_Win32: Avoid an IOException on Windows if bash is not in PATH

Change-Id: I3145f74ecee9f5b368e7f4b9fd7cb906f407eff5
Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

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

@@ -111,10 +111,10 @@ public class FS_Win32 extends FS {
 		if (gitExe != null)
 			return resolveGrandparentFile(gitExe);
 
-		// This isn't likely to work, if bash is in $PATH, git should
-		// also be in $PATH. But its worth trying.
-		//
-		String w = readPipe(userHome(), //
+		if (searchPath(path, "bash.exe") != null) { //$NON-NLS-1$
+			// This isn't likely to work, but its worth trying:
+			// If bash is in $PATH, git should also be in $PATH.
+			String w = readPipe(userHome(),
 					new String[] { "bash", "--login", "-c", "which git" }, // //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
 					Charset.defaultCharset().name());
 			if (w != null) {
@@ -123,6 +123,8 @@ public class FS_Win32 extends FS {
 				if (gitExe != null)
 					return resolveGrandparentFile(gitExe);
 			}
+		}
+
 		return null;
 	}