wic: add wic_init_parser_cp

Add parser for 'wic cp' subcommand and a custom argument type.

(From OE-Core rev: df5152c834ef58036b41ad51b19eda6abecd9543)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/wic

@@ -341,6 +341,8 @@ def imgtype(arg):
         image, part = image.split(':')
         if '/' in part:
             part, path = part.split('/', 1)
+        if not path:
+            path = '/'
 
     if not os.path.isfile(image):
         err = "%s is not a regular file or symlink" % image
@@ -354,6 +356,20 @@ def wic_init_parser_ls(subparser):
     subparser.add_argument("-n", "--native-sysroot",
                         help="path to the native sysroot containing the tools")
 
+def imgpathtype(arg):
+    img = imgtype(arg)
+    if img.part is None:
+        raise argparse.ArgumentTypeError("partition number is not specified")
+    return img
+
+def wic_init_parser_cp(subparser):
+    subparser.add_argument("src",
+                        help="source spec")
+    subparser.add_argument("dest", type=imgpathtype,
+                        help="image spec: <image>:<vfat partition>[<path>]")
+    subparser.add_argument("-n", "--native-sysroot",
+                        help="path to the native sysroot containing the tools")
+
 def wic_init_parser_help(subparser):
     helpparsers = subparser.add_subparsers(dest='help_topic', help=hlp.wic_usage)
     for helptopic in helptopics: