FROM golang:alpine as builder

RUN apk update && apk add --no-cache git ca-certificates tzdata && update-ca-certificates

ENV USER=appuser

ENV UID=10001

RUN adduser \
    --disabled-password \
    --gecos "" \
    --home "/nonexistent" \
    --shell "/sbin/nologin" \
    --no-create-home \
    --uid "${UID}" \
    "${USER}"

WORKDIR /app

# use modules
COPY go.mod .

ENV GO111MODULE=on
RUN go mod download && go mod verify

COPY . .

RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
    -ldflags='-w -s -extldflags "-static"' -a \
    -o /go/bin/teldrive .


FROM scratch

COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=builder /etc/passwd /etc/passwd
COPY --from=builder /etc/group /etc/group

COPY --from=builder /go/bin/teldrive /go/bin/teldrive

USER appuser:appuser

EXPOSE 8080

ENTRYPOINT ["/go/bin/teldrive"]