Splitting the Home Assistant Yellow configuration into its own
repository; the generic Aimee OS build system and configuration are now
tracked in a separate repository.
In effort to support different builds of Aimee OS using the same
scripts, without necessarily having to fork this repository, the build
system now supports a `CONFIGDIR` setting. When this variable is set,
files defining the target environment, such as the lists of packages to
install, the kernel configuration, the Portage configuration, etc. are
found in the path it specifes.
The reference build, for the Home Assistant Yellow board, is configured
in the `yellow` directory. To build it, run:
```sh
CONFIGDIR=yellow ./vm-build.sh
```
The Portage packages that need to be built and/or installed are now
specified in the `build.packages` and `install.packages` files,
respectively. Similarly, packages to be installed on the host system
are specified in `host-tools.packages`. Finally, the
`installonly.packages` file contains a list of packages that are
installed in the destination root, but not built in the sysroot
beforehand.
This allows `make` to better track when the package sets change. It
will also make it easier to maintain different sets for different
variants in the future.
Dustin