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Make final docker image smaller #292

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Make final docker image smaller #292

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56 changes: 18 additions & 38 deletions Dockerfile
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Original file line number Diff line number Diff line change
@@ -1,45 +1,25 @@
FROM alpine:edge
LABEL maintainer="dev@jpillora.com"
FROM golang:1.12.6-alpine as builder
# prepare go env
ENV GOPATH /go
ENV NAME cloud-torrent
ENV PACKAGE github.com/jpillora/$NAME
ENV PACKAGE_DIR $GOPATH/src/$PACKAGE
ENV GOLANG_VERSION 1.9.1
ENV GOLANG_SRC_URL https://golang.org/dl/go$GOLANG_VERSION.src.tar.gz
ENV GOLANG_SRC_SHA256 a84afc9dc7d64fe0fa84d4d735e2ece23831a22117b50dafc75c1484f1cb550e
ENV PATH $GOPATH/bin:/usr/local/go/bin:$PATH
ENV CGO_ENABLED 0
# in one step (to prevent creating superfluous layers):
# 1. fetch and install temporary build programs,
# 2. build cloud-torrent alpine binary
# 3. remove build programs
RUN set -ex \
&& apk update \
&& apk add ca-certificates \
&& apk add --no-cache --virtual .build-deps \
bash \
gcc \
musl-dev \
openssl \
git \
go \
curl \
&& curl -s https://raw.githubusercontent.com/docker-library/golang/221ee92559f2963c1fe55646d3516f5b8f4c91a4/1.9/alpine3.6/no-pic.patch -o /no-pic.patch \
&& cat /no-pic.patch \
&& export GOROOT_BOOTSTRAP="$(go env GOROOT)" \
&& wget -q "$GOLANG_SRC_URL" -O golang.tar.gz \
&& echo "$GOLANG_SRC_SHA256 golang.tar.gz" | sha256sum -c - \
&& tar -C /usr/local -xzf golang.tar.gz \
&& rm golang.tar.gz \
&& cd /usr/local/go/src \
&& patch -p2 -i /no-pic.patch \
&& ./make.bash \
&& mkdir -p $PACKAGE_DIR \
&& git clone https://$PACKAGE.git $PACKAGE_DIR \
&& cd $PACKAGE_DIR \
&& go build -ldflags "-X main.VERSION=$(git describe --abbrev=0 --tags)" -o /usr/local/bin/$NAME \
&& apk del .build-deps \
&& rm -rf /no-pic.patch $GOPATH /usr/local/go
#run!
ENTRYPOINT ["cloud-torrent"]

RUN apk add --no-cache ca-certificates bash gcc musl-dev openssl git go curl
RUN git clone https://$PACKAGE.git $PACKAGE_DIR
RUN cd $PACKAGE_DIR && go build -ldflags "-X main.VERSION=$(git describe --abbrev=0 --tags)" -o /usr/local/bin/$NAME



FROM alpine:3.9
LABEL maintainer="jpillora <dev@jpillora.com>"

RUN apk add --no-cache ca-certificates openssl curl

COPY --from=builder /usr/local/bin/$NAME /

WORKDIR downloads

ENTRYPOINT ["/cloud-torrent"]