gistfile1.txt

#!/bin/sh
if [ -f ".tpm2-getkey.tmp" ]; then
# tmp file exists, meaning we tried the TPM this boot, but it didn’t work for the drive and this must be the second
# or later pass for the drive. Either the TPM is failed/missing, or has the wrong key stored in it.
/lib/cryptsetup/askpass "Automatic disk unlock via TPM failed for  () Enter passphrase: "
exit
fi
# No tmp, so it is the first time trying the script. Create a tmp file and try the TPM
touch .tpm2-getkey.tmp
  
tpm2_nvread 0x1500016