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feat(nix): bound the store, generations and boot menu (task 0014) #7

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alexion merged 2 commits from task-0014-nix-store-housekeeping into main 2026-07-20 10:43:51 -04:00
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.claude/tasks/0014-nix-store-housekeeping.md
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@@ -15,7 +15,7 @@ Retained boot configurations are capped at 15. Each generation stores a kernel a
- [x] Retained boot configurations are capped at 15 - [x] Retained boot configurations are capped at 15
- [x] These are declared as plumbing in the shared base config, so every future `Host` inherits them - [x] These are declared as plumbing in the shared base config, so every future `Host` inherits them
- [x] `nix flake check` builds the `neogaia` toplevel - [x] `nix flake check` builds the `neogaia` toplevel
- [ ] Manual confirmation after a rebuild: the collection and optimisation timers exist and are scheduled - [x] Manual confirmation after a rebuild: the collection and optimisation timers exist and are scheduled
## Implementation Notes ## Implementation Notes
@@ -26,5 +26,5 @@ Collection now runs `Mon 03:15` and optimisation `Thu 03:45`, which keeps both w
The boot configuration cap sits in the shared base as the task asks, and is inert rather than an error on a host that does not use systemd-boot. The boot configuration cap sits in the shared base as the task asks, and is inert rather than an error on a host that does not use systemd-boot.
A future host on another bootloader therefore inherits no cap, which is the one place the "every future host inherits them" promise does not reach. A future host on another bootloader therefore inherits no cap, which is the one place the "every future host inherits them" promise does not reach.
The last criterion is left open: confirming the timers on a running system needs a `nixos-rebuild switch`, which needs a sudo credential this session did not have. Confirmed on `neogaia` after a switch: `systemctl list-timers 'nix-*'` lists both units, `nix-optimise` next on Thursday and `nix-gc` next on Monday, each `Persistent=true` so a suspended laptop catches up on a missed firing.
It closes the way tasks 0013, 0016 and 0017 did, in a follow-up commit once the operator has switched the machine and read `systemctl list-timers`. `/boot` reports 2 GiB with 113 MiB used, so the cap of 15 sits against the enlarged partition it assumes.