build and packaging updates

1. Update Dockerfile.dapper to install Go 1.12, separate go gets for better image layer caching

2. replace ubuntu image with simple alpine base image

3. add linker flag -w for smaller binary

4. gitignore some generated files

.gitignore

@@ -10,3 +10,7 @@
 
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
+
+*dapper*
+!Dockerfile.dapper
+bin/

Dockerfile.dapper

@@ -19,8 +19,8 @@ RUN wget -O - ${!DOCKER_URL} > /usr/bin/docker && chmod +x /usr/bin/docker
 ENV GOLANG_ARCH_amd64=amd64 GOLANG_ARCH_arm=armv6l GOLANG_ARCH=GOLANG_ARCH_${ARCH} \
     GOPATH=/go PATH=/go/bin:/usr/local/go/bin:${PATH} SHELL=/bin/bash
 
-RUN wget -O - https://storage.googleapis.com/golang/go1.11.linux-${!GOLANG_ARCH}.tar.gz | tar -xzf - -C /usr/local && \
-    go get github.com/rancher/trash && go get github.com/golang/lint/golint
+RUN wget -O - https://storage.googleapis.com/golang/go1.12.linux-${!GOLANG_ARCH}.tar.gz | tar -xzf - -C /usr/local
+RUN go get github.com/rancher/trash && go get golang.org/x/lint/golint
 
 ENV DAPPER_SOURCE /go/src/github.com/rancher/local-path-provisioner
 ENV DAPPER_OUTPUT ./bin

package/Dockerfile

@@ -1,8 +1,5 @@
-FROM ubuntu:16.04
+FROM alpine:latest
 
-RUN apt-get update && apt-get install -y curl vim nfs-common iproute dnsutils iputils-ping telnet
+COPY bin /bin
 
-COPY bin /usr/local/sbin/
-
-VOLUME /usr/local/sbin
-CMD ["local-path-provisioner"]
+ENTRYPOINT ["/bin/local-path-provisioner"]

scripts/build

@@ -5,5 +5,5 @@ cd $(dirname $0)/..
 VERSION=${VERSION:-$(./scripts/version)}
 
 mkdir -p bin
-[ "$(uname)" != "Darwin" ] && LINKFLAGS="-extldflags -static -s"
+[ "$(uname)" != "Darwin" ] && LINKFLAGS="-extldflags -static -s -w"
 CGO_ENABLED=0 go build -ldflags "-X main.VERSION=$VERSION $LINKFLAGS" -o bin/local-path-provisioner