fix docker build

.gitignore

@@ -1,6 +1,8 @@
 goproxy
 go_repos/*
+cacheDir/*
 .idea/*
+bin/*
 
 pkg/*
-!pkg/proxy
+!pkg/proxy

Dockerfile

@@ -1,3 +1,15 @@
-FROM alpine:3.8
-RUN apk add --no-cache git mercurial subversion bzr fossil
-COPY bin/goproxy /usr/bin/goproxy
+FROM golang:1.11 AS build
+
+env GO111MODULE on
+env GOROOT /usr/local/go
+
+COPY ./ /goproxy
+WORKDIR /goproxy
+RUN go generate
+RUN go build
+
+FROM buildpack-deps:stretch-scm
+COPY --from=build /goproxy/goproxy /bin/goproxy
+EXPOSE 8081
+
+CMD ["goproxy"]

README.md

@@ -9,15 +9,19 @@ A global proxy for go modules. see: [https://goproxy.io](https://goproxy.io)
 
 ## Started
     
-    ./goproxy -listen=0.0.0.0:80 -cacheDir=/cache
+    ./goproxy -listen=0.0.0.0:80 -cacheDir=/data
 
-## Docker
+## Docker build
 
-    docker run --name goproxy -d -p80:8081 goproxyio/goproxy
+    docker build . --no-cache -t goproxy/goproxy:latest
 
-Use the -v flag to persisting the proxy module data (change ___go_repo___ to your own dir):
+## Docker run
 
-    docker run --name goproxy -d -p80:8081 -v go_repo:/cache goproxyio/goproxy
+    docker run --name goproxy -d -p80:8081 goproxy/goproxy
+
+Use the -v flag to persisting the proxy module data (change ___cacheDir___ to your own dir):
+
+    docker run --name goproxy -d -p80:8081 -v cacheDir:/go goproxy/goproxy
 
 ## Docker Compose
 

docker-compose.yaml

@@ -7,4 +7,4 @@ services:
     - "8081:8081"
     restart: always
     volumes:
-      - ./go_repos:/ext
+      - ./cacheDir:/ext

main.go

@@ -33,9 +33,11 @@ func main() {
 	if cacheDir == "" {
 		cacheDir = "/go"
 		gpEnv := os.Getenv("GOPATH")
-		gp := filepath.SplitList(gpEnv)
-		if gp[0] != "" {
-			cacheDir = gp[0]
+		if gpEnv != "" {
+			gp := filepath.SplitList(gpEnv)
+			if gp[0] != "" {
+				cacheDir = gp[0]
+			}
 		}
 	}
 	fullCacheDir := filepath.Join(cacheDir, "pkg", "mod", "cache", "download")