Package as a Docker image (#12)

* Package as a Docker image

* Addressed Viswa's comment

.gitignore

@@ -1,5 +1,11 @@
 # Setting files of JetBrains IDE
-.idea
+/.idea
 
 # Empty file touched by `make deps`
 /deps
+
+# Project specifc $GOBIN
+/.gobin
+
+# Binary
+/image/network-crawler

Makefile

@@ -15,6 +15,7 @@ ifeq ($(UNAME_S),Darwin)
     HOST_OS := darwin
 endif
 
+TAG := $(shell ./get-tag)
 
 GOBIN := $(CURDIR)/.gobin
 PATH := $(GOBIN):$(PATH)
@@ -39,7 +40,7 @@ $(STATICCHECK_BIN): deps
 	@go install honnef.co/go/tools/cmd/staticcheck
 
 ###########
-## Lint ##
+## Lint  ##
 ###########
 
 .PHONY: golangci-lint
@@ -69,3 +70,34 @@ lint: golangci-lint staticcheck
 test: 
 	go test ./...
 
+
+###########
+## Build ##
+###########
+
+.PHONY: tag
+tag:
+	@echo $(TAG)
+
+.PHONY: build
+build:
+	@echo "+ $@"
+	@mkdir -p "$(GOBIN)"
+	@CGO_ENABLED=0 GOOS=linux \
+	go build -a -ldflags "-s -w" \
+		-o $(GOBIN)/linux/network-crawler ./cmd/network-crawler
+	@CGO_ENABLED=0 GOOS=darwin \
+	go build -a -ldflags "-s -w" \
+		-o $(GOBIN)/darwin/network-crawler ./cmd/network-crawler
+	@cp $(GOBIN)/$(HOST_OS)/network-crawler $(GOBIN)/network-crawler
+
+.PHONY: image
+image: build
+	@echo "+ $@"
+	@cp $(GOBIN)/linux/network-crawler ./image
+	@docker build -t us.gcr.io/stackrox-hub/network-crawler:$(TAG) image
+
+.PHONY: push
+push: image
+	@echo "+ $@"
+	@docker push us.gcr.io/stackrox-hub/network-crawler:$(TAG) | cat

get-tag

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+if [ -n "${CIRCLE_TAG}" ]; then
+  echo "${CIRCLE_TAG}"
+else
+  git describe --long --tags --abbrev=10 --dirty
+fi

image/Dockerfile

@@ -0,0 +1,8 @@
+FROM alpine:3.12
+
+# Needed by network-crawler script
+RUN apk add curl
+
+COPY network-crawler /usr/bin/network-crawler
+
+ENTRYPOINT ["/usr/bin/network-crawler"]

pkg/crawlers/azure/azure.go

@@ -167,7 +167,7 @@ func (c *azureNetworkCrawler) redirectToJSONURL(rawURL string) (string, error) {
 			// Trim trailing newline char
 			"tr -d '\n'",
 		rawURL)
-	out, err := exec.Command("bash", "-c", cmd).Output()
+	out, err := exec.Command("/bin/sh", "-c", cmd).Output()
 	if err != nil {
 		errors.Wrapf(err, "failed to redirect to JSON URL while trying to crawl Azure with URL: %s", rawURL)
 		return "", err