Dockerfile.base

# This Dockerfile produces a single Docker image that holds a whitelisted set of built binaries,
# as defined in scripts/build-cd-base.bash.
# Downstream builds will copy only the binaries they need from this base layer.

FROM docker.io/golang:1.12-buster as builder

# Workdir isn't going to change, so set it first.
# We don't need to be in a fake GOPATH anymore.
WORKDIR /app

# Copy over the shell scripts we use inside other downstream containers.
# These scripts are less likely to change than the binaries we compile.
COPY \
	./service/foo/do_something.sh \
	./service/bar/do_something_else.sh \
	/app-bins/

# Assuming the vendor directory is up-to-date with `go mod vendor`.
COPY . /app

# Build the whitelisted binaries.
RUN APP_BIN_DEST=/app-bins CLEAN_GOCACHE=1 /app/scripts/build-cd-base.bash

# Our final image is only going to hold the binaries and any shell scripts needed for other images.
FROM scratch
COPY --from=builder /app/ /app-bins/