wic: Avoid problems with "-" characters in plugin names

Remap "-" characters in plugin names to "_" so wic plugins
can be extended using standard python class inheritance.

This change means wic files can be incrementally updated over time
to the correct name rather than breaking everything. Actual plugin
module files will need to be renamed as done in previous patches.

Also remove a double call to get_plugins() which isn't needed.

(From OE-Core rev: 6d9c76196ffad39e628aff76d53d6ecbb517cfa1)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/wic/engine.py

@@ -180,6 +180,8 @@ def wic_create(wks_file, rootfs_dir, bootimg_dir, kernel_dir,
         os.makedirs(options.outdir)
 
     pname = options.imager
+    # Don't support '-' in plugin names
+    pname = pname.replace("-", "_")
     plugin_class = PluginMgr.get_plugins('imager').get(pname)
     if not plugin_class:
         raise WicError('Unknown plugin: %s' % pname)

scripts/lib/wic/partition.py

@@ -164,6 +164,9 @@ class Partition():
 
         plugins = PluginMgr.get_plugins('source')
 
+        # Don't support '-' in plugin names
+        self.source = self.source.replace("-", "_")
+
         if self.source not in plugins:
             raise WicError("The '%s' --source specified for %s doesn't exist.\n\t"
                            "See 'wic list source-plugins' for a list of available"
@@ -178,7 +181,7 @@ class Partition():
             splitted = self.sourceparams.split(',')
             srcparams_dict = dict((par.split('=', 1) + [None])[:2] for par in splitted if par)
 
-        plugin = PluginMgr.get_plugins('source')[self.source]
+        plugin = plugins[self.source]
         plugin.do_configure_partition(self, srcparams_dict, creator,
                                       cr_workdir, oe_builddir, bootimg_dir,
                                       kernel_dir, native_sysroot)

scripts/lib/wic/plugins/imager/direct.py

@@ -203,6 +203,8 @@ class DirectPlugin(ImagerPlugin):
         source_plugin = self.ks.bootloader.source
         disk_name = self.parts[0].disk
         if source_plugin:
+            # Don't support '-' in plugin names
+            source_plugin = source_plugin.replace("-", "_")
             plugin = PluginMgr.get_plugins('source')[source_plugin]
             plugin.do_install_disk(self._image, disk_name, self, self.workdir,
                                    self.oe_builddir, self.bootimg_dir,