[Bug 1980018] Re: Cryptsetup-initramfs cant deal with tpm2-device option

[asi]

Unlocking of TPM tokens is implemented in systemd LUKS2 token handlers, not in cryptsetup itself. 
It can be compiled as plugins (then check cryptsetup --help "LUKS2 external token plugin path" and check that in this directory in initramfs are systemd plugins installed).

But systemd can also implement it directly in systemd-
cryptsetup/cryptenroll - then you need only the systemd binaries. I am
really not sure what Ubuntu uses now, the first option should be
preferred for future.

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https://bugs.launchpad.net/bugs/1980018

Title:
  Cryptsetup-initramfs cant deal with tpm2-device option

Status in cryptsetup package in Ubuntu:
  Confirmed

Bug description:
  In order to boot an encrypted system and autounlock with tpm2, the
  tpm2-device= option must be specified in  /etc/crypttab. This works
  for non-root filesystems for some reason, but when applied to root
  filesystems it doesnt. Tested working on both arch and fedora, so the
  method is good, something is off in the background.


  root at test:~# update-initramfs -u
  update-initramfs: Generating /boot/initrd.img-5.15.0-40-generic
  cryptsetup: WARNING: sda3_crypt: ignoring unknown option 'tpm2-device'

  
  Manually adding it to  /lib/cryptsetup/functions produces this

  root at test:~# update-initramfs -u
  update-initramfs: Generating /boot/initrd.img-5.15.0-40-generic
  /usr/share/initramfs-tools/hooks/cryptroot: 1: eval: CRYPTTAB_OPTION_tpm2-device=auto: not found

  
  That file belongs to cryptsetup-initramfs

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