Rewrite grub-install, grub-mkrescue, grub-mkstandalone and grub-mknetdir

the function of these files exceeds what can be sanely handled in shell
	in posix-comaptible way. Also writing it in C extends the functionality
	to non-UNIX-like OS and minimal environments.

include/grub/osdep/exec_unix.h

@@ -0,0 +1,39 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_EMU_EXEC_H
+#define GRUB_EMU_EXEC_H 1
+
+#include <config.h>
+#include <stdarg.h>
+
+#include <sys/types.h>
+pid_t
+grub_util_exec_pipe (const char *const *argv, int *fd);
+pid_t
+grub_util_exec_pipe_stderr (const char *const *argv, int *fd);
+
+int
+grub_util_exec (const char *const *argv);
+int
+grub_util_exec_redirect (const char *const *argv, const char *stdin_file,
+			 const char *stdout_file);
+int
+grub_util_exec_redirect_null (const char *const *argv);
+
+#endif

include/grub/osdep/hostfile_aros.h

@@ -50,6 +50,12 @@ grub_util_fd_readdir (grub_util_fd_dir_t dirp)
   return readdir (dirp);
 }
 
+static inline int
+grub_util_rmdir (const char *pathname)
+{
+  return rmdir (pathname);
+}
+
 static inline int
 grub_util_unlink (const char *pathname)
 {
@@ -62,7 +68,7 @@ grub_util_rename (const char *from, const char *to)
   return rename (from, to);
 }
 
-#define grub_util_mkdir(a) mkdir (a)
+#define grub_util_mkdir(a) mkdir (a, 0700)
 
 struct grub_util_fd
 {
@@ -86,7 +92,7 @@ enum grub_util_fd_open_flags_t
     GRUB_UTIL_FD_O_RDONLY = O_RDONLY,
     GRUB_UTIL_FD_O_WRONLY = O_WRONLY,
     GRUB_UTIL_FD_O_RDWR = O_RDWR,
-    GRUB_UTIL_FD_O_CREAT = O_CREAT,
+    GRUB_UTIL_FD_O_CREATTRUNC = O_CREAT | O_TRUNC,
     GRUB_UTIL_FD_O_SYNC = (0
 #ifdef O_SYNC
 			   | O_SYNC

include/grub/osdep/hostfile_unix.h

@@ -59,6 +59,12 @@ grub_util_unlink (const char *pathname)
   return unlink (pathname);
 }
 
+static inline int
+grub_util_rmdir (const char *pathname)
+{
+  return rmdir (pathname);
+}
+
 static inline int
 grub_util_rename (const char *from, const char *to)
 {

include/grub/osdep/hostfile_windows.h

@@ -55,6 +55,9 @@ grub_util_fd_closedir (grub_util_fd_dir_t dirp);
 grub_util_fd_dirent_t
 grub_util_fd_readdir (grub_util_fd_dir_t dirp);
 
+int
+grub_util_rmdir (const char *pathname);
+
 enum grub_util_fd_open_flags_t
   {
     GRUB_UTIL_FD_O_RDONLY = 1,