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# syntax=docker/dockerfile:1
ARG GO_VERSION=1.23
ARG ALPINE_VERSION=3.20
FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS golatest
FROM golatest AS buildctl
WORKDIR /src
ENV CGO_ENABLED=0
ARG TARGETPLATFORM
RUN --mount=target=. \
--mount=target=/root/.cache,type=cache \
--mount=target=/go/pkg/mod,type=cache \
go build -mod=vendor -o /usr/bin/buildctl ./cmd/buildctl
FROM golatest AS docsgen
WORKDIR /src
ENV CGO_ENABLED=0
RUN --mount=target=. \
--mount=target=/root/.cache,type=cache \
--mount=target=/go/pkg/mod,type=cache \
go build -mod=vendor -o /out/docsgen ./docs/generate.go
FROM alpine AS gen
RUN apk add --no-cache rsync git
WORKDIR /src
COPY --from=docsgen /out/docsgen /usr/bin
COPY --from=buildctl /usr/bin/buildctl /usr/bin/
RUN --mount=target=/context \
--mount=target=.,type=tmpfs <<EOT
set -e
rsync -a /context/. .
docsgen
mkdir /out
cp -r docs/* /out
EOT
FROM scratch AS update
COPY --from=gen /out /
FROM gen AS validate
RUN --mount=target=/context \
--mount=target=.,type=tmpfs <<EOT
set -e
rsync -a /context/. .
git add -A
rm -rf docs/*
cp -rf /out/* ./docs/
if [ -n "$(git status --porcelain -- docs/)" ]; then
echo >&2 'ERROR: Docs result differs. Please update with "make docs"'
git status --porcelain -- docs/
exit 1
fi
EOT
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