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Give linode-* hosts a real Disko config, simplify auto-install.sh

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Linode provisions and sizes /dev/sda (root) and /dev/sdb (swap) itself
as whole, unpartitioned block devices before the OS ever boots.
modules/disko/linode.nix declares them with destroy = false (skips
Disko's wipe stage for these disks entirely) and a bare filesystem/swap
content type matching that existing layout, so re-running it against an
already-provisioned disk only mkfs/mkswaps if blkid shows it isn't
formatted yet -- never repartitions or destroys data.

With every host reachable through the installer menu now carrying a
Disko config, auto-install.sh no longer needs to probe the flake and
branch between `disko --mode destroy,format,mount` and a bind-mount
fallback -- it just always runs Disko.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01La55Nsss8jZ7ZuzUV9mfot
This commit is contained in:
beatzaplenty
2026-07-20 08:04:34 +10:00
co-authored by Claude Sonnet 5
parent 2aa625d566
commit a351cbcf80
6 changed files with 70 additions and 29 deletions
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docs/auto-installer.md
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@@ -126,10 +126,24 @@ next, where you can `scp` a key in after boot, same as before this migration.
## Storage
Disk partitioning is handled by Disko — the installer has no hardcoded
`parted`/`mkfs`/`mkswap`/`mount` commands. Each host defines its own layout
via `disko.devices`; a host without one is installed in place via bind-mount
(this is how every LXC container target works, since they have no raw block
device to partition).
`parted`/`mkfs`/`mkswap`/`mount` commands, and `auto-install.sh` runs
`disko --mode destroy,format,mount` unconditionally, no branching on whether
the target has a Disko config. Every host reachable through this menu has
one:
- `proxmox-*` (`modules/disko/proxmox.nix`): a real GPT partition table
(ESP + swap + root) on `/dev/sda`.
- `linode-*` (`modules/disko/linode.nix`): Linode provisions and sizes
`/dev/sda`/`/dev/sdb` itself as whole, unpartitioned block devices before
the OS ever boots, so this declares them with `destroy = false` (skips
disko's wipe stage for these disks entirely — see the option's own docs)
and a bare `filesystem`/`swap` content type with no partition table, and
the format step it does run only calls `mkfs`/`mkswap` if `blkid` shows
the device isn't already formatted — a re-run against an
already-provisioned Linode disk is a no-op, not a wipe.
`lxc-*` is the only category without one — it's excluded from this menu
entirely (see "LXC hosts" above), so it never reaches this code path.
## Installer process
@@ -138,7 +152,7 @@ device to partition).
1. Queries `nixosConfigurations` from this flake over the network (`git+https://<lanDomain>/beatzaplenty/nixos.git`) — this happens at *install* time, not build time, so a generic installer image always sees whatever hosts are currently committed, without needing a rebuild.
2. Presents them as a menu; confirms the choice.
3. Skips the `nix-cache` substituter when installing a `nix-cache` host itself (consistent with that host's own runtime config).
4. Runs `disko --mode destroy,format,mount` if the target has a Disko config, otherwise bind-mounts `/` onto `/mnt`.
4. Runs `disko --mode destroy,format,mount` (see "Storage" above — every host reachable through this menu has a Disko config, so this is unconditional).
5. Installs the target's SSH host key from `/etc/host-keys` or `/root/host-keys` (see "Host keys" above).
6. Runs `nixos-install --flake <url>#<choice> --no-root-password`.
7. Cleans up and reboots.