Building

Dockerfile

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+
+# See Makefile
+ARG IMAGE_GOLANG=golang:1.16.4-alpine3.13
+ARG IMAGE_ALPINE=alpine:3.13
+
+FROM $IMAGE_ALPINE AS helper
+
+RUN adduser -u 10001 -h /dev/null -H -D -s /sbin/nologin snake
+
+RUN sed -i '/^snake/!d' /etc/passwd
+
+FROM $IMAGE_GOLANG AS builder
+
+ARG VERSION=unknown
+ARG BUILD=unknown
+
+WORKDIR /go/src/snake-bot
+
+COPY . .
+
+ENV CGO_ENABLED=0
+
+RUN go build -ldflags "-s -w -X main.Version=$VERSION -X main.Build=$BUILD" \
+ -v -x -o /snake-bot ./cmd/snake-bot
+
+FROM scratch
+
+COPY --from=helper /etc/passwd /etc/passwd
+
+USER snake
+
+COPY --from=builder /snake-bot /usr/local/bin/snake-bot
+
+ENTRYPOINT ["snake-bot"]

Makefile

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+
+EXECUTABLES=git go docker
+
+_=$(foreach exec,$(EXECUTABLES), \
+ $(if $(shell which $(exec)), ok, $(error "No $(exec) in PATH")))
+
+IMAGE=ivan1993spb/snake-bot
+
+IMAGE_GOLANG=golang:1.16.4-alpine3.13
+IMAGE_ALPINE=alpine:3.13
+
+BINARY_NAME=snake-bot
+VERSION=$(shell git describe --tags --abbrev=0 2>/dev/null || echo v0.0.0)
+BUILD=$(shell git rev-parse --short HEAD)
+
+LDFLAGS=-ldflags "-s -w -X main.Version=$(VERSION) -X main.Build=$(BUILD)"
+DOCKER_BUILD_ARGS=\
+ --build-arg VERSION=$(VERSION) \
+ --build-arg BUILD=$(BUILD) \
+ --build-arg IMAGE_GOLANG=$(IMAGE_GOLANG) \
+ --build-arg IMAGE_ALPINE=$(IMAGE_ALPINE)
+
+default: build
+
+docker/build:
+ @docker build $(DOCKER_BUILD_ARGS) -t $(IMAGE):$(VERSION) .
+ @docker tag $(IMAGE):$(VERSION) $(IMAGE):latest
+ @echo "Build $(BUILD) tagged $(IMAGE):$(VERSION)"
+ @echo "Build $(BUILD) tagged $(IMAGE):latest"
+
+docker/push:
+ @echo "Push build $(BUILD) with tag $(IMAGE):$(VERSION)"
+ @docker push $(IMAGE):$(VERSION)
+ @echo "Push build $(BUILD) with tag $(IMAGE):latest"
+ @docker push $(IMAGE):latest
+
+build:
+ @go build $(LDFLAGS) -v -o $(BINARY_NAME) ./cmd/snake-bot
+
+install:
+ @go install $(LDFLAGS) -v ./cmd/snake-bot
+
+coverprofile:
+ @go test -coverprofile=coverage.out ./...
+ @go tool cover -func=coverage.out
+ @go tool cover -html=coverage.out