oc-discovery/Dockerfile

# -------------------- deps stage --------------------
FROM golang:alpine AS deps

WORKDIR /app
COPY go.mod go.sum ./
RUN sed -i '/replace/d' go.mod && \
    go mod download

# -------------------- builder stage --------------------
FROM golang:alpine AS builder

# Buildx injects these
ARG TARGETOS
ARG TARGETARCH

# We want static binaries for scratch
ENV CGO_ENABLED=0

WORKDIR /app

# tools needed during build
RUN apk add --no-cache git

# install bee for the BUILD platform 
RUN go install github.com/beego/bee/v2@latest

WORKDIR /oc-discovery

# reuse module cache from deps
COPY --from=deps /go/pkg /go/pkg
COPY --from=deps /app/go.mod /app/go.sum ./

# copy the source code
COPY . .

RUN sed -i '/replace/d' go.mod

# build
RUN GOOS=$TARGETOS GOARCH=$TARGETARCH CGO_ENABLED=0 bee pack

# unpack bee's tarball
RUN mkdir -p /app/extracted && \
    tar -zxvf oc-discovery.tar.gz -C /app/extracted && \
    sed -i 's#http://127.0.0.1:8080/swagger/swagger.json#swagger.json#g' \
      /app/extracted/swagger/index.html

# -------------------- final image --------------------
FROM scratch

WORKDIR /app

# copy the binary & assets
COPY --from=builder /app/extracted/oc-discovery /usr/bin/oc-discovery
COPY --from=builder /app/extracted/swagger ./swagger
COPY --from=builder /app/extracted/docker_discovery.json /etc/oc/discovery.json

EXPOSE 8080

# run
ENTRYPOINT ["/usr/bin/oc-discovery"]