initramfs-tools: ipv4: FIB table does not exist in local-bottom/clevis

[natthias]

I am in the process of packaging clevis for Chimera Linux, which uses initramfs-tools for initramfs. Everything works fine and clevis can decrypt both luksv1 and luksv2 with tpm.

However, I am facing one issue in the local-bottom/clevis script. When the script brings down all interfaces, the command on line 50, ip route flush dev "$iface", results in the following error
Error: ipv4: FIB table does not exist

The error itself is harmless and boot proceeds like normal, but it should probably be silenced or clevis should no attempt to bring down interfaces it has not brough up