docs: R-21 slice C — REPORT/CONTEXT + capability-map (universal-ISO chain, slice C live-verified) + ROADMAP (R-21 SHIPPED A+B+C, R-27 self-bind future)
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> **Overwrite** this file with a summary of the most recent task only (uniform with the other repos; not cumulative). The cumulative hub history lives in [hub/CHANGELOG.md](hub/CHANGELOG.md); the scripts history lives in [scripts/CHANGELOG.md](scripts/CHANGELOG.md).
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## scripts v1.18.0 — R-21 slice B: firmware loader option `--loader shim|mkimage` (F1) — 2026-07-17
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## R-21 slice C — the universal secret-free ISO (hub v0.62.0 + scripts v1.19.0) — 2026-07-17
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**Baseline:** scripts v1.17.0 (host-install) / build-felhom-iso.sh was ISO_VERSION 1.16.0. Target
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**v1.18.0**. Closes N100 **F1 (HIGH):** cheap AMI (`AN3PLUS 0.01`-class) UEFI firmware can't relocate
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the ISO's stock signed GRUB from USB (`relocation 0x0`); the run's live `grub-mkimage` workaround is
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now a first-class pipeline mode. Touched **only** `scripts/iso/`.
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**Baselines:** hub v0.61.0 → **v0.62.0**; scripts v1.18.0 (`3172df1`) → **v1.19.0**. Commits `36c5cd5`
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(code), `9964ae6` (manifest). Hub **v0.62.0 LIVE** on k3s (Synced/Healthy). R-21 now shipped A+B+C.
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### What shipped
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`build-felhom-iso.sh` gains `--loader shim|mkimage` (default **shim**, profile-settable via
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`FELHOM_LOADER`, `--loader` wins). **shim = the stock output, byte-for-byte unchanged** (surgery
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skipped). **mkimage** replaces the ISO's UEFI boot path with a monolithic `grub-mkimage` loader.
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New: `mkimage-surgery.sh`, `profiles/n100.profile`, Dockerfile grub/mtools tooling; loud banner +
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manifest `loader:`/`grub-mkimage:` fields + `-mkimage` filename suffix.
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The last R-21 slice: a **generic, secret-free** ISO. Blank box → unattended install → the box
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registers itself at the hub as an *unclaimed appliance* → the operator binds it to a customer → the hub
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delivers `customer-id` + retrieval passphrase **once** → day-0 completes via the existing slice-A path.
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The distributed ISO carries no secret (§4.4). Slice-A direct mode (env-baked) survives unchanged.
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### Surgery approach actually used (Phase 2)
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### Registration payload (as implemented) + token model
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Recipe reproduced from the run evidence (the literal command was run on the now-wiped N100 old system
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and saved nowhere — only the *procedure* is recorded; see Observations). In the assistant container,
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**after** `prepare-iso`:
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1. `xorriso -osirrox` extract the prepared tree (chmod u+w — osirrox files are read-only).
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2. `grub-mkimage -O x86_64-efi` from the **container's** grub 2.12 build (`/usr/lib/grub/x86_64-efi`,
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which has `kernel.img` — the ISO ships modules but not kernel.img; the box likewise used its
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*installed* GRUB). Module set = the base search/configfile/USB chain **plus every `insmod` in the
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ISO's own `grub.cfg`** (57 modules). Embedded config: `search --fs-uuid <ISO uuid>` → `configfile`
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the real menu. The fs-uuid is derived from the ISO's PVD modification-date (GRUB's iso9660 uuid
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source) and pinned on re-master so it stays valid.
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3. Swap the loader into the ISO9660 tree (**real lowercase Rock-Ridge path** `/efi/boot/bootx64.efi` —
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an early bug created a spurious *uppercase* path instead; fixed) **and** inside the `efi.img` ESP
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(FAT, case-insensitive — the loader UEFI firmware actually runs from USB).
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4. Re-master with `xorriso -as mkisofs` from the ISO's own `as_mkisofs` report, dropping **only** the
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Apple HFS+/APM map (`-hfsplus`/`-apm-block-size`) and the isohybrid GPT-basdat marking
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(`-part_like_isohybrid`/`-isohybrid-gpt-basdat`) — re-emitting those trips xorriso 1.5.6's
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"Overlapping MBR partition entries" on this layout, and Mac boot is irrelevant. **Kept:** protective
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MBR + grub2-mbr (BIOS hybrid) + El Torito (BIOS + UEFI) + the GPT EFI System Partition (USB UEFI).
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`POST /api/v1/appliance/register` body: `{uuid, macs[], ssh_host_pubkeys[], hw{product, cpu, mem_kb}}`.
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Keyed by **(uuid, mac_set)** — the N100 DMI verdict (serials = "Default string") + cheap-board duplicate
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SMBIOS UUIDs make the **MAC set the tiebreaker** (same uuid + different mac-set = distinct appliance).
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**Token model:** a random **256-bit** appliance token per registration, returned once, stored only as
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**sha256** (`token_hash`); it is the box's sole pre-day-0 credential, never logged. Invalidated on
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discard (`token_hash` blanked + status sticky) and after consume. `GET /api/v1/appliance/poll` (Bearer
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token): unknown/discarded → **404** (no oracle) · unbound → **204** · bound → **200** + creds (consumed
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once) · delivered → **410**. The passphrase is read live from `customer_configs` (plaintext, as the
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day-0 command already requires) and never logged. register is the ONE unauthenticated endpoint, per-IP
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rate-limited (the ingress already geo-restricts to HU).
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**Stall-rule outcome:** the surgery resisted for ~40 min of iteration (two overlap failures + the
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kernel.img and path-case bugs) — **well within the 2 h budget**; no spike-note fallback needed.
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### Red-proofs (run-fail-revert, all recorded)
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### Per-leg results (RUNBOOK-B, nested VM 311 on felhom-pve, OVMF)
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- **One-shot delivery (C):** defeat `MarkApplianceDelivered`'s bound→delivered flip → the second poll
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re-delivers the passphrase (200) instead of 410 → `TestAppliancePoll_OneShotAnd410` FAILS → restored.
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- **Register idempotency (A):** drop the `(uuid, mac_set)` upsert branch → the re-register hits the
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UNIQUE backstop (500) → `TestApplianceRegister_Idempotent` FAILS → restored. (The UNIQUE index is the
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load-bearing backstop; the upsert is the graceful update.)
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- **Direct-mode regression (D):** `test/bootstrap-modes.sh` — a direct env drives `run_direct` and makes
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**ZERO** `/appliance/*` calls (fake hub records none); the pairing code path is provably not entered.
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Plus 404-no-oracle + sticky-discard, bind staging/refusal + no-host-count-gate, and the render test.
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- **Leg 1 — shim regression:** the default ISO **boots + zero-touch auto-installs under OVMF Secure
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Boot ENFORCING** (`pre-enrolled-keys=1`; "EFI boot mode detected", DHCP, "Starting Proxmox
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installation", package extraction unattended). **Plus one SeaBIOS boot** — the shim ISO also boots
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under BIOS (hybrid grub2-mbr/eltorito path survived the v1.18.0 build). ✓
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- **Leg 2 — mkimage happy path:** `--loader mkimage` ISO **boots + auto-installs under OVMF Secure
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Boot OFF** (`pre-enrolled-keys=0`). The monolith's embedded `search --fs-uuid` found the ISO and
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chained its real menu → the installer ran. ✓
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- **Leg 3 — trade-off red-proof:** the **same** mkimage ISO under OVMF Secure Boot ENFORCING
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**FAILS** — captured firmware behavior: `BdsDxe: failed to load Boot0002 "UEFI QEMU DVD-ROM …" :
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Access Denied` → `No bootable option or device was found`. The unsigned loader is refused. This
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makes "Secure Boot must be OFF for mkimage" a **fact**, not a guess. ✓
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- **Leg 4 — structural / byte-identity:** diffing the shim(out) vs mkimage(final) trees, **only**
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`efi/boot/bootx64.efi`, `efi/boot/grubx64.efi`, `efi.img`, and the regenerated El Torito artifacts
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(`boot.cat`, `i386-pc/eltorito.img`) differ — **the entire install payload is byte-identical**. The
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tree loader (1253376 B, vs shim's 1032032 B) carries the embedded `2026-05-21-…` fs-uuid and is
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identical to the loader inside `efi.img`; **0 spurious uppercase paths**; El Torito keeps both boot
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images. The `validate-answer` gate still runs pre-surgery. ✓
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### Deploy verification
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### Artifacts (shas + manifests)
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Hub 0.62.0 rolled out (Synced/Healthy, image confirmed). **Live smoke through the public ingress:**
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`POST /appliance/register` → 200 with a 256-bit token; poll (valid, unbound) → **204**; poll (bogus
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token) → **404** (no oracle). (The `smoke-test-uuid` record is CC test litter — discard on the hub.)
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- shim nested-test ISO `…-nested-vm-val.iso` — `28d862e2f7b014588717c15ef8c9bc46d11a9a5689a022f5d4de9e8f939d1377`
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- mkimage nested-test ISO `…-nested-vm-val-mkimage.iso` — `71fce3333b3148e48d10711311f275da4b849bf383f711de0f2e4d5802618869`
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- **safety ISO** `…-n100-safety-mkimage.iso` — `f9aa0428e5efdcb5e7c0ade05264ff681ac4f9aa47b7f3721c9eb712f025c1a8`
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(mkimage + match-nothing filter; **built + sha-recorded, NOT booted**; at `180:~/n100-baremetal/safety/`).
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Manifests record `loader: mkimage … Secure Boot OFF`, `grub-mkimage: 2.12-9+deb13u2`, secret-bearing.
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Nested-test ISOs + VM 311 destroyed after the legs.
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### Scenario E (the composition proof) + the secret-free artifact assertion
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### Physical proof on the real AMI board
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- **Generic ISO built** `felhom-pve-9.2-1-v1.19.0-generic-generic.iso` (sha
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`f37080c835300b6cc2831bd6e5a483cad307f4d009469ee4206442fe9bebd348`). **Secret-free asserted on the
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artifact:** manifest `mode: pairing` / `secret-bearing: no`; the env decoded from the ISO's
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`/proxmox-first-boot` stub carries **only** `FELHOM_HUB_URL` + `FELHOM_INSTALL_URL` — no
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`FELHOM_CUSTOMER_ID`, no `FELHOM_RETRIEVAL_PASSPHRASE`.
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- **Nested boot → register (CONFIRMED live):** the generic ISO booted on scratch VM 311 (SeaBIOS, LAN,
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uuid `7ed8cb9e-…`, MAC `bc:24:11:c3:b3:d0`) → **zero-touch install** (answer file consumed, disk `sda`
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auto-selected, country HU) → reboot → installed system → first-boot pairing → **registered at the
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LIVE hub**: `[INFO] appliance registered: new unclaimed box (uuid=7ed8cb9e-…, macs=1, ssh_keys=3)` —
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the box gathered its MAC + all 3 SSH host keys exactly as designed. It now polls 204 (unbound),
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**staged for the operator bind**. The record + VM are left in place as the handoff. *(Boot-order
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lesson: the scratch VM must boot `scsi0;ide2` — disk-first, CD-fallback — or a CD-first order
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reinstalls in a loop and never reaches first-boot.)*
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- **The bind is the coordinated Viktor moment** (operator-password-gated; CC cannot log in). CC has
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staged everything: the box is registered and visible; a Viktor-created drill customer + the 2-minute
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bind click complete boot→register→**bind**→delivery→day-0, then the drill customer is torn down via
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RESET then Delete (re-exercising v0.61.0/v0.60.1). The bind→delivery→day-0 legs are proven by the
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hub unit tests + the `bootstrap-modes.sh` delivery handoff; the live composition folds into the
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supervised rehearsal, **which now runs the complete final product flow in one pass**.
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Shape **(a) DEFAULT** stands unless Viktor picks otherwise: the F1 closure folds into the supervised
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N100 rehearsal (its install ISO built `--loader mkimage`). Shape **(b)** — the zero-risk `n100-safety`
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pre-flight ISO — is **built and sha-recorded** (above), ready either way; **do not boot without Viktor**.
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### SSH-host-key pinning disposition
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### Docs diffs
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`scripts/CHANGELOG.md` (v1.18.0); `scripts/iso/README.md` (loader-modes section + N100 SB-off prep +
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`mkimage-surgery.sh` row); `scripts/iso/profiles/n100.profile` (new, mkimage); `VALIDATION-n100-baremetal`
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F1 → PIPELINE-FIXED erratum; `00-capability-map.md` (new bare-metal ISO row + loader caveat);
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`ROADMAP.md` (slice B collapsed to SHIPPED; PXE one-line deferred note); `CONTEXT.md`.
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The registration payload carries the box's SSH host public keys; they are **stored** with the appliance
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record and their **fingerprints displayed** in the unclaimed-appliances UI. They are **not** auto-attached
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to the host on bind — the `hosts` row is minted later by the box's own `/host-enroll` (mint-once-reuse),
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and no clean "attach host keys to host" hand-off surface exists today. Per the spec's fallback, this is
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the store+display+**Observation** path, not new plumbing (a future item can wire TOFU-free pinning).
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### Observations
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- **The literal `grub-mkimage` command was unrecoverable** — it ran on the N100's old system (wiped at
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the run) and is not in `~/n100-baremetal/` nor 180's history. Only the *procedure* is recorded
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(VALIDATION F1 / CONTEXT). Reproduced faithfully: mkimage from a working (non-ISO) 2.12 GRUB build,
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module set = the ISO's grub.cfg needs, embedded `search --fs-uuid` → `configfile`. Not a strategy
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re-derivation.
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- The mkimage re-master **drops Apple HFS+/APM (Mac boot)** — irrelevant for N100/PC, and required to
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avoid xorriso's overlap check. BIOS + UEFI + GPT-ESP boot all preserved (asserted in-build + Leg 4).
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- Leg 2's "first-boot stub fires" is assured transitively: Leg 4 proved the first-boot payload is
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byte-identical to the shim variant's (slice-A-proven), and Leg 2 proved the answer is consumed. A
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full ~10-min nested install-to-first-boot was not re-run for the mkimage ISO on that basis.
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- **Bind never gates on host count** (multi-host customers are real — Peti); the picker shows counts as
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display only. A post-RESET customer is naturally hostless and binds fine (tested).
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- **Pre-bind provenance** is the `appliance_registrations` row's own timestamps (register/discard have no
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customer to scope an `events` row to — `events.customer_id` is NOT NULL); `appliance_bound` /
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`appliance_credential_delivered` events are recorded once a customer exists.
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- **Universal disk selection is out of slice-C scope:** `profiles/generic.profile` defaults to the first
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SATA disk (`sda`); NVMe/other targets need a profile variant (a future concern, noted in the profile).
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- **Poll cadence = systemd:** the bootstrap does one poll per invocation and exits non-zero when unbound,
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reusing `Restart=on-failure`/`RestartSec=30` as the 30s poll timer (no long-running-oneshot timeout).
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