wic: implement search of includes

Used custom argument type to implement search of include
.wks files in canned wks paths. Include files can be
specified either by full path or by name.

[YOCTO #8848]

(From OE-Core rev: 3695962ba4b685f304f1039978cec60d1b1712e3)

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

scripts/lib/wic/ksparser.py

@@ -25,11 +25,12 @@
 # Ed Bartosh <ed.bartosh> (at] linux.intel.com>
 
 
-
+import os
 import shlex
 from argparse import ArgumentParser, ArgumentError, ArgumentTypeError
 
 from wic.partition import Partition
+from wic.utils.misc import find_canned
 
 class KickStartError(Exception):
     pass
@@ -78,6 +79,17 @@ def overheadtype(arg):
 
     return result
 
+def cannedpathtype(arg):
+    """
+    Custom type for ArgumentParser
+    Tries to find file in the list of canned wks paths
+    """
+    scripts_path = os.path.abspath(os.path.dirname(__file__) + '../../..')
+    result = find_canned(scripts_path, arg)
+    if not result:
+        raise ArgumentTypeError("file not found: %s" % arg)
+    return result
+
 class KickStart(object):
     def __init__(self, confpath):
 
@@ -117,7 +129,7 @@ class KickStart(object):
         bootloader.add_argument('--source')
 
         include = subparsers.add_parser('include')
-        include.add_argument('path')
+        include.add_argument('path', type=cannedpathtype)
 
         self._parse(parser, confpath)