Many software licenses require that source files be provided along with the binaries.
To simplify this process, two classes were created:
src_distribute.bbclass and
src_distribute_local.bbclass.
The results of these classes are tmp/deploy/source/
subdirs with sources sorted by
LICENSE field.
If recipes list few licenses (or have entries like "Bitstream Vera"),
the source archive is placed in each license directory.
This class operates using three modes:
copy: Copies the files to the distribute directory.
symlink: Symlinks the files to the distribute directory.
move+symlink: Moves the files into the distribute directory and then symlinks them back.