Seems like the last update I ran this morning broke the system somehow (logs, though I doub’t they help: https://paste.osmc.tv/ehunovokaj). The media center keeps restarting and showing me the sad face splash, but the OS is still fine and can be accessed through SSH. I’m guessing a reinstall is the easiest way forward but I don’t have any SD cards laying around right now. Is that absolutely necessary or can I do it through command line somehow?
You are using a Testing Branch of Kodi Leia so you basically should report issues their.
As you could see in the testing thread you need to install libbluray from the stretch-devel repo.
Yes for a full reinstall you need a SD Card or USB stick.
But in your situation if you have SSH access you can still fix things.