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docs(consumers): read the pin manifest, never a copy of it

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Re-vendor tooling and docs-sync equivalents read the pin docs/VENDORED.txt
(available at 0.5.0 and later) instead of naming the doc set themselves, so
a new doctrine file reaches every consumer at its next ordinary pin bump
with zero list edits. A hardcoded list propagates nothing and its
staleness is silent: docs-sync --check asserts byte-identity for the files
the list names and says nothing about one it omits.

What makes reading the manifest sufficient rather than merely better is
the self-guard this PR adds, tagged unreleased until the first tag carries
it, per the RELEASES.md paragraph above it.

Refs #251
This commit is contained in:
cndgrr 2026-08-04 10:04:02 +00:00
parent 5677710b2c
commit 7909383ca0
2 changed files with 45 additions and 0 deletions
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14
changelog.d/251.md Normal file
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@ -0,0 +1,14 @@
### Added
- CI now refuses a root `*.md` declared in neither `docs/VENDORED.txt` nor the
guard's short exemption list, so a new doctrine file can no longer reach a
tag undeclared and stay invisible to every consumer's `docs-sync` (#251).
- The same guard reads the manifest the other way: every entry must resolve to
a regular, non-empty, tracked file — no symlink, no directory, no `../`
escape (#251).
### Changed
- Consumer guidance: re-vendor tooling reads the pin's `docs/VENDORED.txt`,
never a hardcoded list, so a new doctrine file propagates at the next
ordinary pin bump with zero list edits (#251).

31
docs/CONSUMERS.md
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@ -598,6 +598,37 @@ It is **unreleased** (#248) until that tag exists: consumers add
`.ceremony/RELEASES.md` only with the ordinary pin bump and re-sync, never by
copying it ahead of their pinned doctrine set.
### Read the manifest, never a copy of it
Anything on the consumer's side that needs to know *which* documents are
vendored — a re-vendor script, a `docs-sync` equivalent, the task list of a
conversion issue — reads **the pin's `docs/VENDORED.txt`** and never names
the files itself. The manifest is available at the pinned ref from `0.5.0`
and later (ceremony#251); it is one path per line, relative to ceremony's
root, and blank lines are ignored:
```sh
# the vendored doc set at the ref this repo is pinned to
curl -fsSL "https://raw.githubusercontent.com/heavy-duty/ceremony/<pinned-tag>/docs/VENDORED.txt"
```
That is the whole benefit: a doctrine file added in ceremony — `RELEASES.md`
was the last, ceremony#248 — reaches every consumer at its next **ordinary
pin bump**, with **zero list edits** anywhere. A hardcoded list propagates
nothing, and its staleness is silent rather than red: `docs-sync --check`
asserts byte-identity for the files the list names and says nothing at all
about one it omits, so a consumer keeps a green guard while governing
itself with doctrine it no longer has.
What makes reading the manifest *sufficient* — rather than merely better
than a copy — is that ceremony's CI now refuses a root doctrine file that is
declared in neither the manifest nor a short in-script exemption list
(`.github/scripts/vendored-check.sh`), so the manifest at a tag is the
complete set as of that tag. That guarantee is **unreleased** (#251) until
the first tag carrying it exists; the manifest is worth reading at every
earlier pin regardless, since it is what `actions/docs-sync` has always
mirrored.
The consumer's ci.yml gains the guard alongside the others:
```yaml