Nixpkgs: Plymouth does not show password prompt with encrypted root

[Slabity]

Issue description

Plymouth has the ability to ask the user for their password to decrypt their root device if necessary. Currently, Plymouth runs after the user already decrypts their device in the TTY, and as far as I can tell there is no option to override this.

Steps to reproduce

1. Encrypt your root with LUKS.

2. Enable plymouth:

boot.plymouth.enable = true

1. Reboot. The init process will request your password before plymouth runs.

Technical details

• System: NixOS 17.09pre108553.0011f9065a (HummingBird)
• Nix version: 1.11.9
• Nixpkgs version: 17.09pre108553.0011f9065a
• Sandboxing enabled: false

[abbradar]

I remember myself trying to implement this some time ago; this would probably need us moving from shell scripts based initrd to systemd. Maybe I'll take another look at this...

[gilligan]

Has anything ever happened in this regard? Does anyone know?

[Slabity]

Unfortunately I was unable to get this working. I ended up disabling plymouth entirely. Hopefully someone else has a better idea on how to get this working.

[hedning]

I might have broken this with #39978. Checking if reverting 5777272bd2f4bde3ec9b048c0da3c388a8e0239e fixes the problem could be worthwhile.

[jtojnar]

Nope @hedning, this issue has been around for a long time.

[nioncode]

Ideally, we should have flicker free boot like Fedora has now (see https://hansdegoede.livejournal.com/19224.html and https://hansdegoede.livejournal.com/19673.html).

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[andersk]

Still an issue. I suspect this will require #72401 (systemd in initramfs) and #99011 (nixos/plymouth: Add label plugin and a font to the initrd).

[cole-h]

May also be influenced by https://github.com/NixOS/nixpkgs/pull/88789.