Files
dnswatcher/Dockerfile.fmt
T
clawbot 4c2932d6d6
check / check (push) Failing after 2m11s
fmt: format and check Markdown with prettier in a container (closes #119)
make fmt and make fmt-check now cover every Markdown file with prettier
(4-space tabs, proseWrap always), as template-app-go does: prettier is
pinned by package.json and yarn.lock and runs in a docker build on a
digest-pinned node image, never on the host. The check is forced to run
with --no-cache-filter, as script/lint is.

script/fmt-check is split into a Go half and a Markdown half because the
Dockerfile lint stage cannot run docker: that stage now runs the Go half
and script/cibuild runs the Markdown half after the build. *.md leaves
.dockerignore so documents reach the build context.

README.md, TESTING.md and TODO.md are reformatted by make fmt; apart from
the README Entrypoints entries, its make fmt line under Building and the
TODO entry, that diff is mechanical.

Model: opus-5-5
2026-10-02 00:19:30 +02:00

56 lines
2.2 KiB
Docker

# prettier over the markdown, in a container, so it is never installed
# on the host. script/fmt-check-markdown builds the fmt-check stage;
# script/fmt builds fmt-out and takes the formatted files back.
# node:22-bookworm-slim, 2026-09-05
FROM node:22-bookworm-slim@sha256:83f487e0a63425e5b4d146fb5e5be574bcbe1b7b843d3ebafdd95eaf7767a7e5 AS nodedeps
# prettier lives outside /src so that a `COPY . .` of the repo cannot
# overwrite it, and so that node_modules never appears in the tree
# prettier is about to walk.
WORKDIR /tools
# package.json pins the version and yarn.lock pins the bytes:
# --frozen-lockfile installs exactly the lockfile's resolution and fails
# if package.json disagrees with it, so the tool cannot float between
# runs. yarn is the one in the image above.
COPY package.json yarn.lock ./
RUN yarn install --frozen-lockfile --non-interactive --no-progress
ENV PATH="/tools/node_modules/.bin:${PATH}"
WORKDIR /src
# Read-only markdown check. Must match $stage in
# script/fmt-check-markdown.
FROM nodedeps AS fmt-check
COPY . .
# --config, not discovery: a .prettierrc that failed to arrive would
# otherwise leave prettier on its defaults, where proseWrap is "preserve"
# and every wrap this check exists to enforce passes. Missing the file is
# a hard error instead. --no-editorconfig for the same reason in reverse:
# .editorconfig is not in the build context, so honouring it here and on
# a developer's machine would be two different answers.
RUN prettier --config .prettierrc --no-editorconfig --check "**/*.md"
# Write path. Not a check: script/fmt builds this and takes the files.
FROM nodedeps AS fmt
COPY . .
RUN prettier --config .prettierrc --no-editorconfig --write "**/*.md"
# Only the markdown leaves, with its paths intact, so that the export
# below cannot put anything else back over the caller's working tree.
RUN mkdir -p /out && cd /src && \
find . -name '*.md' -type f -exec cp --parents '{}' /out/ ';'
# Export target: `docker build --target fmt-out --output type=local`
# writes /out's tree into a directory on the client, which is how
# script/fmt gets formatted markdown back without a bind mount.
# Must match $stage in script/fmt.
FROM scratch AS fmt-out
COPY --from=fmt /out/ /