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fix(impermanence): rollback as systemd initrd service, not postDeviceCommands

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themes/engine/plymouth.nix enables systemd stage-1 initrd
(boot.initrd.systemd.enable) distro-wide, and Plymouth is imported
unconditionally from core/system/default.nix. systemd stage 1 hard-rejects
boot.initrd.postDeviceCommands with a failed assertion, so every config
with nomarchy.system.impermanence.enable = true — including installs that
chose impermanence at the installer prompt — failed to evaluate.

Convert the Erase-Your-Darlings rollback to a boot.initrd.systemd.services
oneshot unit ordered after the LUKS mapping opens and before sysroot.mount,
and add boot.initrd.systemd.initrdBin for btrfs-progs/coreutils/util-linux/
findutils (the systemd initrd doesn't ship them by default). Script body is
unchanged. Verified eval via extendModules on nixosConfigurations.default;
boot-time wipe semantics still need a real wipe-boot cycle (Pillar 8).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Bernardo Magri
2026-05-29 18:24:01 +01:00
parent 905ed4f6d8
commit 38c70e4aaf
3 changed files with 47 additions and 24 deletions
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docs/TROUBLESHOOTING.md
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@@ -97,7 +97,7 @@ If churn continues, you have a config under `~/.config/<app>/` that home-manager
error: The path '/persist' does not exist
```
**Cause:** Impermanence requires (a) a `/persist` mountpoint that survives the boot wipe, and (b) every directory you want to keep must be in the persistence list. Nomarchy persists the basics in `core/system/impermanence.nix:46-72` (NetworkManager, Bluetooth, fprint, SSH host keys, the user's `.ssh` / `.gnupg` / Documents / Downloads / Pictures / Videos / Projects). Anything else you care about — Steam library, Flatpak data, custom dotfiles — must be added.
**Cause:** Impermanence requires (a) a `/persist` mountpoint that survives the boot wipe, and (b) every directory you want to keep must be in the persistence list. Nomarchy persists the basics in `core/system/impermanence.nix:91-120` (NetworkManager, Bluetooth, fprint, SSH host keys, the user's `.ssh` / `.gnupg` / Documents / Downloads / Pictures / Videos / Projects). Anything else you care about — Steam library, Flatpak data, custom dotfiles — must be added.
**Fix:** Make sure `/persist` is mounted (check `mount | grep persist`). Then add the missing path in your `system.nix`: