build: support building inside a container

Author: Ramkumar Chinchani

Dockerfile

@@ -0,0 +1,7 @@
+FROM golang:1.12.8
+
+RUN go version
+ENV GO111MODULE on
+RUN go get -u github.com/swaggo/swag/cmd/swag
+WORKDIR /go/src/github.com/anuvu/zot
+RUN curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s v1.17.1

Makefile

@@ -1,5 +1,7 @@
 export GO111MODULE=on
 TOP_LEVEL=$(shell git rev-parse --show-toplevel)
+CONTAINER_RUNTIME := $(shell command -v podman 2> /dev/null || echo docker)
+PATH := bin:$(PATH)
 
 .PHONY: all
 all: doc binary debug test check
@@ -17,12 +19,10 @@ test:
 	$(shell cd test/data; ./gen_certs.sh; cd ${TOP_LEVEL})
 	go test -v -race -cover -coverprofile=coverage.txt -covermode=atomic ./...
 
-./bin/golangci-lint:
-	curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s v1.17.1
-
 .PHONY: check
-check: ./bin/golangci-lint
-	./bin/golangci-lint run --enable-all ./cmd/... ./pkg/...
+check:
+	golangci-lint --version || curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s v1.17.1
+	golangci-lint run --enable-all ./cmd/... ./pkg/...
 
 .PHONY: doc
 doc:
@@ -36,3 +36,9 @@ clean:
 .PHONY: run
 run: binary test
 	./bin/zot serve examples/config-test.json
+
+.PHONY: binary-container
+binary-container:
+	${CONTAINER_RUNTIME} build ${BUILD_ARGS} -f Dockerfile -t zot:latest .
+	${CONTAINER_RUNTIME} run --rm --security-opt label=disable -v $$(pwd):/go/src/github.com/anuvu/zot \
+		zot:latest make

README.md

@@ -9,6 +9,27 @@
 * *Basic* and TLS mutual authentication
 * Swagger based documentation
 
+# Building
+
+* Build inside a container (preferred)
+
+```
+make binary-container
+```
+
+* Build using host's toolchain
+
+```
+make
+
+```
+
+Build artifacts are in bin/
+
+# Running
+
+bin/zot serve _<config>_
+
 # Caveats
 
 * go 1.12+