# AUR Auto Update

Nightly reconciler that keeps the `aur/*` package repos and their AUR
counterparts in sync.

This is a **reconciler**, not a version-bump script. A new upstream release is
only one of the things that can make a package diverge from the AUR; a manual
push to origin is another, and a push that failed last night is a third. All
three take the same path, and the AUR reconcile runs on every pass.

## Layout

| file | role |
|---|---|
| `autoupdate.sh` | entry point; orchestrates one or more packages |
| `latest-version.sh` | resolves the latest upstream version (GitHub / Gitea) |
| `update-checksums.sh` | downloads sources, computes sha256, rewrites the arrays |
| `sync-aur.sh` | reconciles the repo against the AUR |
| `common.sh` | logging, guards, PKGBUILD parsing and array splicing |
| `test.sh` | hermetic test suite |
| `.gitea/workflows/update.yaml` | nightly matrix job |

Nothing here is package-specific. Everything that differs between packages
lives in a `.autoupdate` manifest committed to the package repo itself.

## Per-package manifest

Each package repo carries a `.autoupdate` file:

```sh
srchost="github"           # github | gitea
srcmntr="Sunhaiy"          # upstream owner/org
srcname="Reflex"           # upstream repo
verstrip="v"               # tag prefix to strip ("app-v" for open-video-downloader-*)
gui="true"                 # extract .desktop + icon from the AppImage
desktop="reflex.desktop"   # name *inside* the AppImage
icon="reflex.png"
```

It rides along to the AUR on push, as `README.md` and `LICENSE` already do.
Harmless: the AUR reads only `PKGBUILD` and `.SRCINFO`.

## What a run does

1. Clone the package repo, read its manifest.
2. Fetch the AUR over **HTTPS** as the reference state. This happens before
   anything else, because `pkgrel` is derived from it. Read-only, so no SSH key
   is required for a dry run.
3. Resolve the upstream version. A *failed lookup* exits 1; "no new version" is
   not a failure.
4. If the version moved, re-download and re-hash the remote sources.
5. Always re-hash local sources (`.desktop`, icons) and regenerate `.SRCINFO`.
   Local hashing needs no network, so this is free, and it is what lets a
   hand-edited repo self-correct.
6. Derive `pkgrel` (below).
7. Validate `.SRCINFO`; abort **before** committing if it is empty or disagrees
   with the PKGBUILD.
8. Commit only if something actually changed.
9. Push to the AUR first, then origin, so a failed AUR push leaves origin clean.

## pkgrel

`X.Y.Z-N` — everything before the dash is upstream, `-N` is packaging-only
revisions. You should never need to touch it by hand.

`pkgrel` is derived from **the AUR**, because that is what `-N` is numbered
against:

- version differs from the published one → `pkgrel = 1`
- same version, packaging content differs → `pkgrel = AUR's + 1`
- same version, packaging identical → unchanged
- you already bumped it yourself → respected, not bumped again

Using the AUR as the reference rather than local history is what makes this
idempotent: once the bump is published, the next night sees no difference and
does nothing. There is a test for exactly that (`pkgrel stable on re-run`).

An edit to a local source such as an icon counts as a packaging change, because
its `sha256sums` entry is regenerated first. A README-only edit does not.

## Environment

| variable | effect |
|---|---|
| `NO_GIT_PUSH=1` | dry run: do everything except push |
| `FORCE_REBUILD=1` | bump `pkgrel` even with no detected change |
| `FORCE_REFRESH=1` | re-download remote sources without a version change |
| `AUR_FORCE=1` | force-push over diverged AUR history (see below) |
| `GIT_HOST` | git host holding the package repos |
| `GITHUB_TOKEN` | optional; avoids GitHub's 60/hour anonymous rate limit |

A rejected AUR push usually means someone pushed there directly. The run fails
loudly rather than overwriting it; inspect, then re-run with `AUR_FORCE=1`.

## Exit codes

"No new upstream version" is the overwhelmingly common outcome and exits **0**.
The trap the previous implementation fell into was giving that same silent
`exit 0` to a lookup that had *broken* — which is how `pman-helper` shipped
`pkgver=""` unnoticed. A failed lookup now exits **1**.

## Requirements

Needs a genuine Arch `makepkg`. Ubuntu's build environment emits an empty
`.SRCINFO`, which the AUR rejects — this silently broke three packages. The CI
job therefore runs in an Arch container as a non-root user (`makepkg` refuses to
run as root), and `regen_srcinfo` in `common.sh` fails loudly if the output is
ever empty again.

`autoupdate.sh` calls `require_tools` on startup, so a missing binary fails
immediately instead of taking a silently wrong branch further in.

## Container image

`dockerfile` builds the environment the nightly job runs in, published to the
Gitea registry as `git.bjphoster.com/aur/autoupdate:latest`. Without it, all six
matrix jobs would run a full `pacman` transaction every night.

`.gitea/workflows/build-image.yaml` rebuilds and overwrites `:latest` monthly
(Arch is rolling, so a month-old image is a month behind), on any push touching
the `dockerfile`, and on demand via `workflow_dispatch`. That job runs on plain
`ubuntu-latest` — it only drives `docker`; the *image* is the Arch part.

Based on `archlinux:base`, not `base-devel`: the autoupdater only ever parses
PKGBUILDs and never compiles, so the toolchain is dead weight — 822 MB against
1.48 GB. Add it back if a real build or verify step is ever introduced.

Building locally:

```sh
docker build -t git.bjphoster.com/aur/autoupdate:latest .
docker run --rm -v "$PWD:/src:ro" git.bjphoster.com/aur/autoupdate:latest \
  bash -c 'cp -r /src /w && chown -R builder:builder /w && cd /w &&
           runuser -u builder -- ./test.sh'
```

Running the suite inside the image is worth doing after any `dockerfile` change.
Trimming to `archlinux:base` originally dropped `diffutils`, and the missing
`diff` made every run look like a packaging change and ratchet `pkgrel` upward —
the host tests passed throughout. `pkgrel` no longer depends on `diff` at all,
but the lesson stands.

### Registry credentials

Needs `vars.REGISTRY_USER` — your Gitea **username**, not `vars.GIT_NAME`, which
is the display name used for commit authorship and contains spaces. The token is
the existing `secrets.GIT_TOKEN`, which needs `write:package` scope.

## Notes on checksums

sha256 only; `sha1sums`/`md5sums` are actively removed.

Checksums are computed directly rather than via `makepkg -g` / `updpkgsums`.
Those generate every arch array in one pass and download all arches into a
single directory, so when two arches rename to the same target
(`foo.AppImage::…-amd64`, `foo.AppImage::…-arm64`) the second finds the first
one's file already there and emits an identical, silently wrong checksum.
Overriding `CARCH` does not help. Downloads here go to content-addressed cache
paths instead, never to the `::` rename target. Multi-arch is supported for
when a package needs it; single-arch is the degenerate case of the same loop.

## Tests

```sh
./test.sh            # all
./test.sh pkgrel     # filter by name
```

Runs against local bare repos and a local HTTP server — no network, and it
never touches the real AUR. Requires a real `makepkg`.