# syntax=docker/dockerfile:1

ARG GO_VERSION=1.24

FROM golang:${GO_VERSION}-alpine AS gomod
RUN  apk add --no-cache git
WORKDIR /src
RUN --mount=target=/src,rw \
    --mount=target=/go/pkg/mod,type=cache \
    go mod tidy && mkdir /out && cp -r go.mod go.sum /out

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

FROM gomod AS validate
RUN --mount=target=.,rw <<EOT
  set -e
  git add -A
  cp -rf /out/* .
  diff=$(git status --porcelain -- go.mod go.sum 2>/dev/null)
  if [ -n "$diff" ]; then
    echo >&2 'ERROR: The result of "docker buildx bake validate-gomod" differs. Please update with "docker buildx bake gomod".'
    echo "$diff"
    exit 1
  fi
EOT