Merge branch 'work-around-isilon'

It would appear that least the Isilon network filesystem (and possibly
other network filesystems, too), report non-standard error values when
trying to access a non-existing directory.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

compat/mingw.c

@@ -441,8 +441,19 @@ static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
 	handle = CreateFileW(wfilename, FILE_APPEND_DATA,
 			FILE_SHARE_WRITE | FILE_SHARE_READ,
 			NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
-	if (handle == INVALID_HANDLE_VALUE)
-		return errno = err_win_to_posix(GetLastError()), -1;
+	if (handle == INVALID_HANDLE_VALUE) {
+		DWORD err = GetLastError();
+		/*
+		 * Some network storage solutions (e.g. Isilon) might return
+		 * ERROR_INVALID_PARAMETER instead of expected error
+		 * ERROR_PATH_NOT_FOUND, which results in a unknow error. If
+		 * so, the error is now forced to be an ERROR_PATH_NOT_FOUND
+		 * error instead.
+		 */
+		if (err == ERROR_INVALID_PARAMETER)
+			err = ERROR_PATH_NOT_FOUND;
+		return errno = err_win_to_posix(err), -1;
+	}
 
 	/*
 	 * No O_APPEND here, because the CRT uses it only to reset the