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# Thanks to https://chemidy.medium.com/create-the-smallest-and-secured-golang-docker-image-based-on-scratch-4752223b7324
############################
# STEP 1 build executable binary
############################
FROM golang:alpine AS builder
ENV USER=certstreamserver
ENV UID=10001
# Create user
RUN adduser \
--disabled-password \
--gecos "" \
--home "/nonexistent" \
--shell "/sbin/nologin" \
--no-create-home \
--uid "${UID}" \
"${USER}"
# Install git. Git is required for fetching the dependencies.
RUN apk update && apk add --no-cache git
WORKDIR $GOPATH/src/certstream-server-go/
COPY . .
# Fetch dependencies.
RUN go mod download
# Build the binary.
RUN go build -ldflags="-w -s" -o /go/bin/certstream-server-go $GOPATH/src/certstream-server-go/cmd/certstream-server-go/
RUN chown -R "${USER}:${USER}" /go/bin/certstream-server-go
############################
# STEP 2 build a small image
############################
FROM alpine
WORKDIR /app
# Import the user and group files from the builder.
COPY --from=builder /etc/passwd /etc/passwd
COPY --from=builder /etc/group /etc/group
# Copy our static executable.
COPY --from=builder /go/bin/certstream-server-go /app/certstream-server-go
COPY --chown=certstreamserver:certstreamserver ./config.sample.yaml /app/config.yaml
# Use an unprivileged user.
USER certstreamserver:certstreamserver
EXPOSE 8080
ENTRYPOINT ["/app/certstream-server-go"]
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