From b0afac0fd2d21401e2e41efe66de975cc1e23c58 Mon Sep 17 00:00:00 2001
From: Chris Johns <chrisj@rtems.org>
Date: Wed, 15 Jun 2016 11:14:16 +1000
Subject: Add root_filesystem support to create a root file system.

To use add to your wscript file:

  rtems.root_filesystem(bld, 'rootfs',
                        ['etc/rc.conf'],
                        'rootfs.tar', 'rootfs-tar.o')

to create a rootfs-tar.o which you add to your executable's list of
sources.

In your main or Init function add:

 #include <rtems/untar.h>
 extern int _binary_rootfs_tar_start;
 extern int _binary_rootfs_tar_size;
 static void expand_rootfs_tarfile(void)
 {
   rtems_status_code sc;
   rtems_printer     printer;
   rtems_print_printer_printf(&printer);
   sc = Untar_FromMemory_Print((void *)(&_binary_rootfs_tar_start),
                               (size_t)&_binary_rootfs_tar_size,
                               &printer);
   if (sc != RTEMS_SUCCESSFUL)
     fprintf(stderr, "error: untar failed: %s\n", rtems_status_text(sc));
 }

Note, some arch's may not need the '_' at the start of the tar symbols.
---
 rtems.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/rtems.py b/rtems.py
index 8384191..3a9ff60 100644
--- a/rtems.py
+++ b/rtems.py
@@ -221,6 +221,7 @@ def configure(conf, bsp_configure = None):
         conf.env.IFLAGS    = cflags['includes']
         conf.env.LINKFLAGS = cflags['cflags'] + ldflags['ldflags']
         conf.env.LIB       = flags['LIB']
+        conf.env.LIBPATH   = ldflags['libpath']
 
         conf.env.RTRACE_WRAPPER_ST = '-W %s'
 
@@ -513,6 +514,16 @@ def library_path(library, cc, cflags):
         return os.path.dirname(lib)
     return None
 
+def root_filesystem(bld, name, files, tar, obj):
+    bld(name = name + '_tar',
+        target = tar,
+        source = files,
+        rule = 'SDIR=$PWD && cd ../.. && tar --format=ustar -cf $SDIR/${TGT} $(echo "${SRC}" | sed -e "s/\.\.\/\.\.\///\")')
+    bld.objects(name = name,
+                target = obj,
+                source = tar,
+                rule = '${OBJCOPY} -I binary -B ${RTEMS_ARCH} ${OBJCOPY_FLAGS} ${SRC} ${TGT}')
+
 def clone_tasks(bld):
     if bld.cmd == 'build':
         for obj in bld.all_task_gen[:]:
@@ -713,6 +724,7 @@ def _filter_flags(label, flags, arch, rtems_path):
     flag_groups = \
         [ { 'key': 'warnings', 'path': False, 'flags': { '-W': 1 }, 'cflags': False, 'lflags': False },
           { 'key': 'includes', 'path': True,  'flags': { '-I': 1, '-isystem': 2, '-sysroot': 2 } },
+          { 'key': 'libpath',  'path': True,  'flags': { '-L': 1 } },
           { 'key': 'machines', 'path': True,  'flags': { '-O': 1, '-m': 1, '-f': 1 } },
           { 'key': 'specs',    'path': True,  'flags': { '-q': 1, '-B': 2, '--specs': 2 } } ]
 
-- 
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