this boot animation is centered around showing a trusted boot TOTP (or the lack thereof) in a really obvious way.
it was created to be used with tpm2-totp, but it can show a numeric code of arbitrary length passed via Plymouth's display-message function.
after installing and setting up Plymouth and tpm2-totp (or an equivalent service), just copy the contents of the repo (specifically, tpmoe.{plymouth, script} and the r34 folder) in /usr/share/plymouth/themes/tpmoe and switch the theme to tpmoe.
this theme requires Plymouth scripting support. attempting to select the theme on a Plymouth installation without scripting support throws an error similar to:
/usr/lib64/plymouth/script.so does not exist
in particular, Fedora is known to ship the script plugin in a seperate package called plymouth-plugin-script.
this banner will be shown on boot while waiting for a TOTP to get passed in.
the TPM does not verify the integrity of your system before your computer gets unsuspended.
this banner will be shown on resume to reflect that.
this banner will be shown on shutdown and suspend.