shithub: hugo

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Update Dockerfile to benefit build cache

Docker has recently introduces buikld-stages (as of version 17.05)

Build stages allows to benefit the docker build cache as well as
reducing the size of the resulting image c.f.
https://docs.docker.com/engine/userguide/eng-image/multistage-build/

This change allows to have faster builds when running `docker build`
several times after changing some little code

Signed-off-by: Thibault Jamet <tjamet@users.noreply.github.com>

--- a/Dockerfile

+++ b/Dockerfile

@@ -1,30 +1,18 @@

-FROM alpine:3.6

+FROM golang:1.9.0-alpine3.6 AS build

-ENV GOPATH /go

-ENV PATH $GOPATH/bin:$PATH

+RUN apk add --no-cache --virtual git musl-dev

+RUN go get github.com/kardianos/govendor

+RUN govendor get github.com/gohugoio/hugo

+WORKDIR /go/src/github.com/gohugoio/hugo

+RUN rm -f $GOPATH/bin/hugo

+RUN go install -ldflags '-s -w'

+FROM alpine:3.6

 RUN \

   adduser -h /site -s /sbin/nologin -u 1000 -D hugo && \

   apk add --no-cache \

-    dumb-init && \

-  apk add --no-cache --virtual .build-deps \

-    gcc \

-    musl-dev \

-    go \

-    git && \

-  mkdir -p \

-    ${GOPATH}/bin \

-    ${GOPATH}/pkg \

-    ${GOPATH}/src && \

-  go get github.com/kardianos/govendor && \

-  govendor get github.com/gohugoio/hugo && \

-  cd $GOPATH/src/github.com/gohugoio/hugo && \

-  rm -f $GOPATH/bin/hugo && \

-  go install -ldflags '-s -w' && \

-  cd $GOPATH && \

-  rm -rf pkg src .cache bin/govendor && \

-  apk del .build-deps

-

+    dumb-init

+COPY --from=build /go/bin/hugo /bin/hugo

 USER    hugo

 WORKDIR /site

 VOLUME  /site

-- 

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