Files
atheos-blog-lxc/aidlc-docs/design-artifacts/requirement-to-unit-map.md
T
hermes c2897ed660 feat: provision Alpine LXC 136 running Atheos, wired to Gitea
Provisions a LAN-only browser code editor (Atheos) in an Alpine 3.23 LXC on the
scotty PVE node, with armistace/blog cloned and ready to edit. Built via the
AI-DLC workflow; the full process trail is in aidlc-docs/.

Deliverables
- scripts/provision.sh          rebuild the guest from scratch (re-runnable)
- scripts/update-atheos.sh      move Atheos to latest upstream and RE-PIN
- scripts/build-and-test.sh     captures evidence for every acceptance criterion
- files/atheos.conf             nginx vhost (socket path byte-matches the FPM pool)
- files/ssh-config              ~atheos/.ssh/config deploy-key alias
- RUNBOOK.md                    operational guide (START AT STEP 1)
- docs/security-notes.md        credential model + wider-web hardening TODOs
- docs/resiliency-notes.md      what a non-PoC deployment would need

Design decisions
- D1 no git identity is configured by the agent; the operator sets it. Git will
  refuse the first commit until then, which is deliberate (requirement FR-11).
- D2 Atheos pinned to commit f90cd18 (build 611) with a verified tarball sha256,
  plus update-atheos.sh as the deliberate escape hatch.
- D3 nginx :80, web root /var/www/atheos, php-fpm over a unix socket.
- D6 git auth is a per-repository DEPLOY KEY scoped to armistace/blog, not a
  personal access token (a PAT's write:repository scope reaches every repo the
  account can write).

Verified on the live guest (40 checks, 0 failures)
- AC-2  Atheos served over HTTP 200 by nginx+php-fpm; socket paths byte-match
- AC-3  20 posts + themes/cleanblog present; owned by the php-fpm user
- AC-4  all five writable paths writable as the service user
- AC-5  remote targets armistace/blog; deploy key authenticates over SSH
- AC-6  survival proven with a real container restart, marker byte-identical
- AC-8  no python/pelican/pip/make and no DB engine - scope boundary enforced
- FR-11 git identity is empty; deploy key mode 600 owned by the service user

Traps documented in the RUNBOOK (each cost real debugging time)
- The Gitea SSH user is `gitea`, NOT `git` (app.ini SSH_USER=gitea). With `git`,
  sshd answers "Invalid user git" and rejects before reading authorized_keys,
  which is indistinguishable from a bad key.
- The Gitea SSH endpoint is the LAN address (:22 is not forwarded publicly).
- `uptime` and `free` report the PVE HOST inside an LXC without lxcfs, so a
  container that just restarted can claim days of uptime.
2026-09-29 15:44:11 +10:00

3.2 KiB

Requirement → Unit Map — atheos-blog-lxc

Stage: INCEPTION — Units Generation (Part 2)

Deliberate substitution. The AI-DLC rules mandate unit-of-work-story-map.md, which maps user stories to units. The User Stories stage was skipped (user-confirmed at the Requirements gate: "no I'm good to skip"). With no stories to map, this document maps requirements and acceptance criteria to units instead — the same assurance (nothing is silently dropped) applied to the artifacts that actually exist.

Functional requirements

FR Requirement (short) Unit
FR-1 Alpine 3.23 LXC on scotty, 20 GB root, 2 vCPU/1 GB, onboot, unprivileged U1
FR-2 nginx + PHP-FPM serving Atheos; ZIP/OPENSSL/MBSTRING; allow_url_fopen=On U2
FR-3 Atheos installed, pinned, 5 writable paths, no DB U3
FR-4 git integration configured (git installed, safe.directory, identity handling) U4
FR-5 armistace/blog cloned into workspace/ on master U4
FR-6 Remote reachable; instructions to switch to SSH; agent doesn't switch it U4 (build) + U5 (document)
FR-7 RUNBOOK.md with IP, SSH, workspace path, remote-switch steps, credential setup U5
FR-8 README.md U5
FR-9 Repeatable provisioning script in the repo U5
FR-10 LAN-only; no NPM/DNS/forward U2 (bind + no proxy config)
FR-11 Agent creates no armistace credentials or git identity U4 (verification asserts identity is empty)
FR-12 docs/security-notes.md + docs/resiliency-notes.md U5

Non-functional requirements

NFR Requirement (short) Unit
NFR-1 Fits comfortably in 20 GB U1 (sizing)
NFR-2 Survives reboot with clone + edits intact U1 (onboot) + U2 (services enabled) + U3/U4 (persistence) → verified at Build & Test
NFR-3 Repeatable / idempotent-friendly provisioning U5
NFR-4 No K3s dependency all (negative)
NFR-5 Timezone Australia/Brisbane U1

Acceptance criteria

AC Short Unit
AC-1 pct config 136 shows Alpine + 20 GB root + onboot U1
AC-2 http://<ip>/ serves Atheos (not 502/404) U2+U3
AC-3 blog present as a project whose files open U3+U4
AC-4 Edit + save persists to disk U3+U4
AC-5 git remote -v points at Gitea; RUNBOOK gives the SSH switch U4+U5
AC-6 Reboot → Atheos serves again, clone + edits intact Build & Test
AC-7 RUNBOOK lets another agent re-provision/hand off U5
AC-8 No Python/pelican present (scope respected) Build & Test

Coverage check

Count Assigned to exactly one unit Unassigned
Functional requirements 12 12 ✔ 0
Non-functional requirements 5 5 ✔ 0
Acceptance criteria 8 8 ✔ 0

Every FR and NFR is assigned to exactly one unit. ACs that require two units to build but one moment to verify (AC-2, AC-3, AC-4) list both; AC-6 and AC-8 are whole-system properties verified once at Build & Test rather than owned by a single unit — noted explicitly rather than left implicit.