Simplify Dockerfile with a dedicated build-go.sh script

In order to have a + simple Dockerfile, Go building commands are now
isolated in a dedicated script

Refs: [ #4145 ]

Dockerfile

@@ -29,45 +29,8 @@ CMD ["/bin/s6-svscan", "/app/gogs/docker/s6/"]
 
 
 ## Build Golang & Gogs
-
-
-# https://golang.org/issue/14851
-#COPY no-pic.patch /
-
-
 COPY docker /app/gogs/docker
 
 RUN set -ex \
-	&& apk add --no-cache --virtual .build-deps \
-		bash \
-		gcc \
-		musl-dev \
-		openssl \
-		go \
-		build-base \
-		linux-pam-dev \
-	\
-	&& 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 /app/gogs/docker/no-pic.patch \
-	&& ./make.bash \
-	\
-	&& rm /app/gogs/docker/*.patch \
-	&& git config --global http.https://gopkg.in.followRedirects true \
-	&& cd /app/gogs/docker/ \
-	&& sh /app/gogs/docker/build.sh \
-	&& rm /app/gogs/docker/build.sh \
-	&& rm /app/gogs/docker/nsswitch.conf \
-	&& rm /app/gogs/docker/README.md \
-	&& apk del .build-deps  \
-	&& mv /go/src/github.com/gogits/gogs/gogs /app/gogs/ \
-	&& mv /go/src/github.com/gogits/gogs/templates /app/gogs/ \
-	&& mv /go/src/github.com/gogits/gogs/scripts /app/gogs/ \
-	&& mv /go/src/github.com/gogits/gogs/public /app/gogs/ \
-	&& rm -rf /go \
-	&& rm -rf /usr/local/go
+	&& sh /app/gogs/docker/build-go.sh \
+	&& sh /app/gogs/docker/build.sh

docker/build-go.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+# Build GO version as specified in Dockerfile
+
+# Install build tools
+apk add --no-cache --virtual .build-deps bash gcc musl-dev openssl go build-base linux-pam-dev
+
+export GOROOT_BOOTSTRAP="$(go env GOROOT)"
+
+# Download Go
+wget -q "$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
+
+# Build
+cd /usr/local/go/src
+# see https://golang.org/issue/14851
+patch -p2 -i /app/gogs/docker/no-pic.patch
+./make.bash
+
+# Clean
+rm /app/gogs/docker/*.patch

docker/build.sh

@@ -15,4 +15,20 @@ make build TAGS="sqlite cert pam"
 
 # Create git user for Gogs
 adduser -H -D -g 'Gogs Git User' git -h /data/git -s /bin/bash && passwd -u git
-echo "export GOGS_CUSTOM=${GOGS_CUSTOM}" >> /etc/profile
+echo "export GOGS_CUSTOM=${GOGS_CUSTOM}" >> /etc/profile
+
+# Move to final place
+mv /go/src/github.com/gogits/gogs/gogs /app/gogs/
+mv /go/src/github.com/gogits/gogs/templates /app/gogs/
+mv /go/src/github.com/gogits/gogs/scripts /app/gogs/
+mv /go/src/github.com/gogits/gogs/public /app/gogs/
+
+# Final cleaning
+rm /app/gogs/docker/build.sh
+rm /app/gogs/docker/build-go.sh
+rm /app/gogs/docker/nsswitch.conf
+rm /app/gogs/docker/README.md
+rm -rf /go
+rm -rf /usr/local/go
+
+apk del .build-deps