Creates an installation .mrom file from SailfishOS install zip and a system.tar.gz file.
Add system.tar.gz to your device's subfolder (e.g. devices/hammerhead/).
This is an archive with contents of /system partition. The easiest way
to create it is install the desired Android ROM and tar its /system partition
with this command:
cd /system
tar --numeric-owner -czf ../system.tar.gz *
Just run the script with path to the SailfishOS ZIP as an argument. You need to be in the same folder as the script!
./build_mrom.sh sailfishos.zip
You can also select the target device and destination file:
./build_mrom.sh --dev=hammerhead --dest=result.mrom sailfishos.zip