Comment 3 for bug 1980018

Hey, just wanted to add my 2c here:
I'm closely following along -- I want to do automatic unlock on a laptop with TPM2. I tried a similar thing of adding tpm2-devices to the /lib/cryptsetup/functions file. There are a number of locations you need to change it; if you follow along one of the other options that takes arguments (like keyfile-size or keyfile-offset), you can eventually get update-initramfs to work without complaint.
However, on reboot, it was effectively bricked with an "unknown option" for cryptsetup (not exactly sure the wording).
I'm wondering if that means it's in cryptsetup-bin, not just the cryptsetup scripts? Running cryptsetup without any options shows it doesn't have that tpm2-device option, and if I look at cryptsetup.c, I can see it defines a bunch of variables like
static uint64_t opt_keyfile_offset = 0;

But tpm2-devices is not one of them.

All of which is to say -- it's not just that /lib/cryptsetup/functions file.... :)