# syntax=docker/dockerfile-upstream:master

ARG GO_VERSION=1.26
ARG ALPINE_VERSION=3.23

FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS base
RUN apk add --no-cache git rsync
WORKDIR /src

FROM base AS vendored
RUN --mount=target=/context \
    --mount=target=.,type=tmpfs  \
    --mount=target=/go/pkg/mod,type=cache <<EOT
  set -e
  rsync -a /context/. .
  go mod tidy
  go mod vendor
  mkdir /out
  cp -r go.mod go.sum vendor /out
EOT

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

FROM vendored AS validate
RUN --mount=target=/context \
    --mount=target=.,type=tmpfs <<EOT
  set -e
  rsync -a /context/. .
  git add -A
  rm -rf vendor
  cp -rf /out/* .
  if [ -n "$(git status --porcelain -- go.mod go.sum vendor)" ]; then
    echo >&2 'ERROR: Vendor result differs. Please vendor your package with "make vendor"'
    git status --porcelain -- go.mod go.sum vendor
    exit 1
  fi
EOT

FROM base AS gomod-updates
RUN --mount=target=.,rw \
  --mount=target=/go/pkg/mod,type=cache \
  --mount=from=crazymax/gomod-updates,source=/usr/bin/gomod-updates,target=/usr/bin/gomod-updates \
  gomod-updates --update --direct --major