# syntax=docker/dockerfile:1

ARG GO_VERSION="1.19"
ARG PROTOC_VERSION="3.17.3"
ARG GLIBC_VERSION="2.33-r0"

FROM golang:${GO_VERSION}-alpine AS base
ARG GLIBC_VERSION
RUN apk add --no-cache curl file git unzip
RUN <<EOT
  set -e
  curl -sSL "https://alpine-pkgs.sgerrand.com/sgerrand.rsa.pub" -o "/etc/apk/keys/sgerrand.rsa.pub"
  curl -sSL "https://github.com/sgerrand/alpine-pkg-glibc/releases/download/${GLIBC_VERSION}/glibc-${GLIBC_VERSION}.apk" -o "glibc.apk"
  apk add glibc.apk
  rm /etc/apk/keys/sgerrand.rsa.pub glibc.apk
EOT
ARG PROTOC_VERSION
RUN <<EOT
  set -e
  curl -sSL "https://github.com/protocolbuffers/protobuf/releases/download/v${PROTOC_VERSION}/protoc-${PROTOC_VERSION}-linux-x86_64.zip" -o "protoc.zip"
  unzip "protoc.zip" -d "/usr/local"
  protoc --version
  rm "protoc.zip"
EOT
WORKDIR /src

FROM base AS vendored
COPY go.mod go.sum ./
RUN --mount=type=cache,target=/go/pkg/mod \
  go mod download

FROM vendored AS tools
RUN --mount=type=bind,target=.,rw \
    --mount=type=cache,target=/go/pkg/mod \
  go install -v $(sed -n -e 's|^\s*_\s*"\(.*\)".*$|\1| p' tools.go)

FROM tools AS generate
RUN --mount=type=bind,target=.,rw \
    --mount=type=cache,target=/go/pkg/mod <<EOT
  set -e
  go generate ./...
  mkdir /out
  cp -Rf pb /out
EOT

FROM scratch AS update
COPY --from=generate /out /

FROM generate AS validate
RUN --mount=type=bind,target=.,rw <<EOT
  set -e
  git add -A
  cp -rf /out/* .
  diff=$(git status --porcelain -- pb)
  if [ -n "$diff" ]; then
    echo >&2 'ERROR: Vendor result differs. Please vendor your package with "docker buildx bake gen"'
    echo "$diff"
    exit 1
  fi
EOT