Use the devtool sync
command to
synchronize a previously extracted source tree for an
existing recipe.
When you use this command, you must supply the root name
of the recipe (i.e. no version, paths, or extensions), and
you must supply the directory to which you want the source
extracted.
Additional command options let you control the name of a development branch into which you can checkout the source and whether or not to keep a temporary directory, which is useful for debugging.