wic: Support for changing the imager.

(From OE-Core rev: 30b33d787595b8c3120b73c755a432a0f0f30fa7)

Signed-off-by: Michael Davis <michael.davis@essvote.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/wic/engine.py

@@ -191,7 +191,7 @@ def wic_create(wks_file, rootfs_dir, bootimg_dir, kernel_dir,
     if not os.path.exists(options.outdir):
         os.makedirs(options.outdir)
 
-    pname = 'direct'
+    pname = options.imager
     plugin_class = PluginMgr.get_plugins('imager').get(pname)
     if not plugin_class:
         raise WicError('Unknown plugin: %s' % pname)

scripts/wic

@@ -362,6 +362,8 @@ def wic_init_parser_create(subparser):
                            "bitbake variables")
     subparser.add_argument("-D", "--debug", dest="debug", action="store_true",
                       default=False, help="output debug information")
+    subparser.add_argument("-i", "--imager", dest="imager",
+                      default="direct", help="the wic imager plugin")
     return