updating build

remove exists function

.dockerignore

@@ -0,0 +1,6 @@
+build.sh
+Dockerfile
+.git
+.idea
+.gitignore
+.dockerignore

Dockerfile

@@ -1,16 +1,17 @@
-FROM golang as builder
+FROM golang:1.12.6-alpine3.10 as builder
+RUN apk add --update --no-cache ca-certificates git tzdata
 WORKDIR /tmp/dnsupdater
-COPY . .
-RUN go get .
+COPY go.mod go.sum ./
+RUN go mod download
+COPY ./ ./
 RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o dnsupdater .
 
 FROM busybox:glibc
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
-COPY --from=builder /tmp/dnsupdater/dnsupdater .
-
 RUN mkdir -p /var/spool/cron/crontabs /var/log
-COPY entry.sh /entry.sh
 RUN touch /var/log/cron.log
-WORKDIR "/"
+
+COPY entry.sh /entry.sh
+COPY --from=builder /tmp/dnsupdater/dnsupdater .
 ENTRYPOINT ["/entry.sh"]

build.sh

@@ -4,4 +4,5 @@ docker build --rm -t llehouerou/dnsupdater:latest .
 rc=$?
 if [[ ${rc} == 0 ]]; then
 	docker push llehouerou/dnsupdater
+	ssh srv03 'docker pull llehouerou/dnsupdater; cd docker/conf/goservices; docker-compose up -d --remove-orphans'
 fi

main.go

@@ -77,15 +77,14 @@ func before(c *cli.Context) error {
 	log.SetLevel(log.InfoLevel)
 
 	configPath = path.Join(c.String("config"), "conf.json")
-	if confPathExists, _ := exists(configPath); !confPathExists {
-		return fmt.Errorf("config file does not exist : %s", configPath)
+	file, err := os.Open(configPath)
+	if err != nil {
+		return fmt.Errorf("error while opening config file: %v", err)
 	}
-
-	file, _ := os.Open(configPath)
 	defer file.Close()
 	decoder := json.NewDecoder(file)
 	configuration = &Configuration{}
-	err := decoder.Decode(configuration)
+	err = decoder.Decode(configuration)
 	if err != nil {
 		return err
 	}
@@ -264,14 +263,3 @@ func GetOutboundIP() (string, error) {
 	}
 	return matches[1], nil
 }
-
-func exists(path string) (bool, error) {
-	_, err := os.Stat(path)
-	if err == nil {
-		return true, nil
-	}
-	if os.IsNotExist(err) {
-		return false, nil
-	}
-	return true, err
-}