virt-install fedora unattended netinst support not working?

I think there's an osinfo-db component to this, but I'm not positive. With virt-manager git I'm running:

./virt-install --cdrom ~/Fedora-Server-netinst-x86_64-26-1.5.iso --unattended --os-variant fedora26 --name unattended --disk none --transient --destroy-on-exit --print-xml

Which is generating the kernel arg XML: <cmdline>ks=file:/fedora.ks inst.repo=</cmdline>

Notice the empty inst.repo= bit. The install then proceeds to not exactly work. The kickstart ends up in the VM and it definitely reads it, but it can't find an install source. I think libosinfo is expecting us to pass a URL here? Maybe that's what needs to be fixed on virt-install side. But the empty inst.repo seems wrong either way, and I'd kinda expect libosinfo could figure out what to use as a tree anyways because it's part of the db data