libretro/wiki/release-process.md

# Release Process

This page documents the CI/CD pipeline: what each workflow does, how releases
are built, and how to run the process manually.

## CI workflows overview

The project uses 2 GitHub Actions workflows. All use only official GitHub
actions (`actions/checkout`, `actions/setup-python`, `actions/upload-pages-artifact`,
`actions/deploy-pages`). No third-party actions.

Budget target: ~175 minutes/month on the GitHub free tier.

| Workflow | File | Trigger |
|----------|------|---------|
| Deploy Site | `deploy-site.yml` | Push to main (platforms, emulators, provenance, wiki, scripts, database.json, mkdocs.yml), manual |
| Validation | `validate.yml` | PR and push to main touching `bios/**`, `platforms/**` or `emulators/**` |

Upstream BIOS lists are not scraped on a schedule. A maintainer runs the
scrapers by hand (see [adding a scraper](adding-a-scraper.md)), reviews the
diff, and commits the refreshed platform YAML. Releases are built on the
maintainer's machine and uploaded with `gh`, see
[cutting a release](#cutting-a-release): the packs weigh 25 GB, more than a
hosted runner should rebuild and re-upload.

## deploy-site.yml - Deploy Documentation Site

**Trigger.** Push to `main` when any of these paths change: `platforms/`,
`emulators/`, `provenance/`, `wiki/`, `scripts/generate_site.py`,
`scripts/generate_readme.py`, `scripts/verify.py`, `scripts/common.py`,
`database.json`, `mkdocs.yml`. Also manual dispatch.

The list is the set of inputs the site is generated from. Adding a new input to
`generate_site.py` means adding its path here, or the site silently goes stale.

**Steps:**

1. Checkout, Python 3.12
2. Install `pyyaml`, `mkdocs-material>=9.7.5,<10`, `pymdown-extensions>=10.14`
3. Restore large files from the `large-files` release, refresh data directories
4. Run `generate_site.py` (converts YAML data into MkDocs pages and rewrites
   `mkdocs.yml`)
5. Run `generate_readme.py` (rebuilds README.md and CONTRIBUTING.md)
6. `mkdocs build --strict` to produce the static site
7. Run `validate_site.py` on the rendered HTML (metadata, headings, image
   alternatives, duplicate ids, local links and fragments)
8. Require the committed README and CONTRIBUTING to match what the generator
   just produced. `write_if_changed()` compares content with the timestamp line
   stripped, so a run that only moves the clock leaves the files untouched and
   the check stays meaningful
9. Upload artifact, deploy to GitHub Pages

Data contracts are validated with `scripts/validate_schemas.py` before the site
is generated: `database.json`, the install and target manifests, the site API
envelopes and the stats file, plus the semantic invariants those schemas cannot
express (declared totals matching their lists, no destination both installed
and omitted).

The site is deployed via the `github-pages` environment using the official
`actions/deploy-pages` action. Pages deployments are queued rather than
cancelled (`cancel-in-progress: false`): cancelling one mid-flight leaves the
deployment stuck and the next runs time out waiting on it.

`--strict` turns MkDocs warnings into failures, so a broken internal link or a
dangling anchor fails the build instead of shipping. The `validation:` block in
`mkdocs.yml` is what promotes unrecognized links and missing anchors to
warnings in the first place.

The theme version is pinned on both sides: `>=9.7.5` because that is the
release which caps `mkdocs < 2` (MkDocs 2.0 ships without a license), `<10`
so a major theme release cannot change the site without a deliberate bump.

## validate.yml - Validation

**Trigger.** Pull requests and direct pushes to main that modify `bios/**`,
`platforms/**`, `emulators/**`, `schemas/**`, `scripts/**`, `tests/**` or
`install.py`. The path lists are spelled out once per event because the
workflow parser reads no YAML anchor.

**Concurrency.** Per-PR group on a pull request, per-ref on a push, cancel
in-progress either way: a push series collapses to the tip.

Four jobs, two of which read pull request context and carry an event guard:

**validate-bios** (pull requests only). Diffs the PR to find changed BIOS
files, runs `validate_pr.py --markdown` on each, and posts the validation
report as a PR comment (hash verification, database match status).

**validate-configs.** Runs `python scripts/validate_schemas.py --source-only`,
which validates every platform YAML against `schemas/platform.schema.json` and
every emulator profile against `schemas/emulator.schema.json`. Both schemas set
`additionalProperties: false`, so a typo in a field name fails the job instead
of being silently ignored.

**run-tests.** Runs `python -m unittest discover tests -v`. Must pass before a
merge, and again on the commit a direct push puts at the head of main.

**label-pr** (pull requests only). Auto-labels the PR based on changed paths:

| Path pattern | Label |
|-------------|-------|
| `bios/` | `bios` |
| `bios/{Manufacturer}/` | `system:{manufacturer}` |
| `platforms/` | `platform-config` |
| `scripts/` | `automation` |

## Large files management

Files larger than 50 MB are stored as assets on a permanent GitHub release
named `large-files` (to keep the git repository lightweight).

Examples: PS3UPDAT.PUP, PSVUPDAT.PUP, PSP2UPDAT.PUP, the DSi NAND images,
maclc3.zip, Firmware.19.0.0.zip (Switch), the QEMU EDK2 firmware, the ScummVM
data bundle, the EasyRPG soundfont, the Dolphin/Ishiiruka SD card images, and
the arcade sets over 100 MB. `.gitignore` is the authoritative list: every
`bios/` path listed there is a release asset.

**Storage.** Listed in `.gitignore` so they stay out of git history. The
`large-files` release is excluded from cleanup (the build workflow only
deletes version-tagged releases).

**Build-time restore.** The build workflow downloads all assets from
`large-files` into `.cache/large/` and copies them to their expected paths
before pack generation.

**Upload.** To add or update a large file:

```bash
gh release upload large-files "bios/Sony/PS3/PS3UPDAT.PUP#PS3UPDAT.PUP"
```

**Local cache.** `generate_pack.py` calls `fetch_large_file()` which downloads
from the release and caches in `.cache/large/` for subsequent runs.

## Cutting a release

Releasing is deliberate and local. Nothing on GitHub builds a pack: the
pipeline runs here, the archives are checked here, and `gh` uploads them.

```bash
# 1. Full pipeline, online, so data directories and MAME/FBNeo hashes are fresh
python scripts/pipeline.py

# 2. RetroPie, which is archived but still served
python scripts/generate_pack.py --platform retropie --output-dir dist/
python scripts/generate_pack.py --platform retropie --verify-packs --output-dir dist/

# 3. Checksums of the full ZIPs, before splitting, then sign the list. The
#    checksums answer corruption; the signature answers a rewritten release,
#    which is the one thing a checksum published beside its own artifacts
#    cannot answer.
(cd dist && sha256sum *.zip > SHA256SUMS.txt)
ssh-keygen -Y sign -f ~/.ssh/retrobios_signing -n file dist/SHA256SUMS.txt

# 4. Split anything over 2 GB (GitHub asset cap); 7-Zip and PeaZip open .001 directly
for f in dist/*.zip; do
  [ "$(stat -c%s "$f")" -gt 2000000000 ] || continue
  split --bytes=1900M --numeric-suffixes=1 --suffix-length=3 "$f" "$f." && rm "$f"
done

# 5. The two sizes a pack has. Extracted runs well above downloaded, so the
#    notes table names the one it carries.
python3 - <<'PY'
import json, pathlib, sys
sys.path.insert(0, "scripts")
from download import _match_key

parts = {}
for path in sorted(pathlib.Path("dist").glob("*_BIOS_Pack.zip*")):
    parts.setdefault(path.name.split(".zip")[0] + ".zip", []).append(path)

def size(n):
    return f"{n / 1024 ** 3:.1f} GB" if n >= 1024 ** 3 else f"{n / 1024 ** 2:.0f} MB"

for manifest in sorted(pathlib.Path("install").glob("*.json")):
    base = next((b for b in parts if _match_key(manifest.stem) in _match_key(b)), None)
    if not base:
        continue
    data = json.loads(manifest.read_text())
    download = sum(p.stat().st_size for p in parts[base])
    print(f"{base:<42} download {size(download):>8}"
          f"   extracted {size(data['total_size']):>8}   {data['total_files']} files")
PY

# 6. Create the release as a DRAFT, upload every asset, and only then publish it.
#    A public release with half its assets is a broken download for everyone
#    during the whole upload.
DATE=$(date +%Y.%m.%d)
gh release create "v${DATE}" --draft --title "BIOS Pack v${DATE}" --notes-file notes.md
for f in dist/SHA256SUMS.txt dist/SHA256SUMS.txt.sig dist/*.zip dist/*.zip.0*; do
  [ -f "$f" ] && gh release upload "v${DATE}" "$f#$(basename "$f")" --clobber
done
gh release view "v${DATE}" --json assets --jq '.assets | length'   # expect every file
gh release edit "v${DATE}" --draft=false --latest

# 7. Keep only the new release plus large-files: an older pack carries hashes
#    the platforms no longer check, so it misleads more than it helps
gh release list --json tagName,createdAt \
  --jq 'sort_by(.createdAt) | reverse | .[].tagName' | grep -v '^large-files$' \
  | tail -n +2 | while read tag; do gh release delete "$tag" --yes --cleanup-tag; done
```

## Verifying a release

`SHA256SUMS.txt` is signed with a key used for nothing else. Its public half
is `allowed_signers` at the repository root, so anyone can check a download
without trusting the release page it came from:

```bash
gh release download --pattern 'SHA256SUMS.txt*' --pattern 'RetroArch_BIOS_Pack.zip*'
curl -fsSLO https://raw.githubusercontent.com/Abdess/retrobios/main/allowed_signers

ssh-keygen -Y verify -f allowed_signers -I releases@retrobios -n file \
  -s SHA256SUMS.txt.sig < SHA256SUMS.txt
sha256sum --check --ignore-missing SHA256SUMS.txt
```

The first command must print `Good "file" signature for releases@retrobios`.
Order matters: verify the list before trusting the sums in it, and join split
volumes before checking, since the sums are of the full ZIPs.

The signature and the reproducible build answer different questions. The
signature says the list came from the holder of the release key. The build
says the bytes are derivable: packs are deterministic, so rebuilding one from
the same collection yields the same archive, and its checksum can be compared
against the signed list without trusting either.

The private half lives on the maintainer's machine and is generated with
`ssh-keygen -t ed25519 -f ~/.ssh/retrobios_signing -C releases@retrobios`.
Registering its public half at
[GitHub signing keys](https://github.com/settings/keys) is optional
redundancy: it lets a verifier cross-check `allowed_signers` against
`https://api.github.com/users/Abdess/ssh_signing_keys`, and needs
`gh auth refresh -h github.com -s admin:ssh_signing_key` first.

Rotating the key means committing the new public half to `allowed_signers`
and keeping the retired line, so signatures on past releases keep verifying.

One pack per platform, the full one: the platform's list plus everything its
cores load. Platform-only and per-emulator packs are build options, not
release assets, since a lighter pack means a core that fails with no message.
The release notes follow the previous release: the quick install commands,
the pack table, what changed since the previous tag, and the contributors of
the closed issues. A pack has two sizes and they are far apart: Batocera
downloads as 2.4 GB and extracts to 4.0 GB. Step 5 prints both, and whichever
one the table carries, the header names it. Someone sizing a USB drive is
reading that column. The README table is the extracted size, from the install
manifests. `SHA256SUMS.txt` lists the checksums of the full ZIPs before
splitting.