From ba019efaf1d24ded097dc85c07526f8e66179492 Mon Sep 17 00:00:00 2001
From: Jakob Borg <jakob@nym.se>
Date: Wed, 19 Nov 2014 15:02:47 +0400
Subject: [PATCH] Use a docker container for full builds

---
 build.sh          | 14 ++++++++++++
 docker/Dockerfile | 56 +++++++++++++++++++++++++++++++++++++++++++++++
 docker/README.md  | 29 ++++++++++++++++++++++++
 3 files changed, 99 insertions(+)
 create mode 100644 docker/Dockerfile
 create mode 100644 docker/README.md

diff --git a/build.sh b/build.sh
index 50dfded97..a02bcad13 100755
--- a/build.sh
+++ b/build.sh
@@ -2,6 +2,8 @@
 set -euo pipefail
 IFS=$'\n\t'
 
+DOCKERIMGV=1.3.3-1
+
 case "${1:-default}" in
 	default)
 		go run build.go
@@ -102,6 +104,18 @@ case "${1:-default}" in
 		fi
 		;;
 
+	docker-init)
+		docker build -q -t syncthing/build:$DOCKERIMGV docker
+		;;
+
+	docker)
+		docker run --rm -h syncthing-builder -u $(id -u) -t \
+			-v $(pwd):/go/src/github.com/syncthing/syncthing \
+			-w /go/src/github.com/syncthing/syncthing \
+			syncthing/build:$DOCKERIMGV \
+			sh -c './build.sh clean && ./build.sh && STTRACE=all ./build.sh test-cov && ./build.sh all'
+		;;
+
 	*)
 		echo "Unknown build command $1"
 		;;
diff --git a/docker/Dockerfile b/docker/Dockerfile
new file mode 100644
index 000000000..823d21fbc
--- /dev/null
+++ b/docker/Dockerfile
@@ -0,0 +1,56 @@
+FROM debian:jessie
+
+# SCMs for "go get", gcc for cgo
+RUN apt-get update && apt-get install -y \
+        ca-certificates curl gcc libc6-dev make \
+        bzr git mercurial unzip \
+        --no-install-recommends \
+        && rm -rf /var/lib/apt/lists/*
+
+ENV GOLANG_VERSION 1.3.3
+
+# Get the binary dist of Go to be able to bootstrap gonative.
+
+RUN curl -sSL https://golang.org/dl/go$GOLANG_VERSION.linux-amd64.tar.gz \
+        | tar -v -C /usr/local -xz
+
+ENV PATH /usr/local/go/bin:$PATH
+RUN mkdir /go
+ENV GOPATH /go
+ENV PATH /go/bin:$PATH
+WORKDIR /go
+
+# Use gonative to install native Go for most arch/OS combos
+
+RUN go get github.com/calmh/gonative
+RUN cd /usr/local \
+        && rm -rf go \
+        && gonative -version $GOLANG_VERSION
+
+# Random build users needs to be able to create stuff in /go/pkg
+
+RUN chmod -R 777 /go/pkg
+
+# Rebuild the special and missing versions
+
+RUN bash -xec '\
+                cd /usr/local/go/src; \
+                for platform in linux/386 freebsd/386 windows/386 linux/arm openbsd/amd64 openbsd/386; do \
+                        GOOS=${platform%/*} \
+                        GOARCH=${platform##*/} \
+                        GOARM=5 \
+                        GO386=387 \
+                        CGO_ENABLED=0 \
+                        ./make.bash --no-clean 2>&1; \
+                done \
+        '
+
+# And rebuild native without the flags above
+
+RUN cd /usr/local/go/src \
+        && ./make.bash --no-clean
+
+# Install packages needed for test coverage
+
+RUN go get github.com/tools/godep && go get code.google.com/p/go.tools/cmd/cover && go get github.com/axw/gocov/gocov && go get github.com/AlekSi/gocov-xml
+
diff --git a/docker/README.md b/docker/README.md
new file mode 100644
index 000000000..26f4917fc
--- /dev/null
+++ b/docker/README.md
@@ -0,0 +1,29 @@
+Docker Build
+============
+
+Official builds are produced using a Docker image specified by the
+Dockerfile in this directory. The following commands exactly reproduce
+the official build process.
+
+Create an image called `syncthing/build` with the build environment.
+
+```
+./build.sh docker-init
+```
+
+> This is a Debian based image containing the latest stable version of
+> Go set up for cross compilation. The cross compilation uses the
+> dynamically linked standard libraries and SSE instructions for amd64
+> builds, but static linking and minimal instruction set for the 386 and
+> arm builds. The command should be run in the main repo directory, as a
+> user with permission to perform Docker operations.
+
+Build the full set of supported binaries.
+
+```
+./build.sh docker
+```
+
+> This uses a temporary container with the image from above and a volume
+> mapped to the directory containing the source. Tests are run and
+> binary packages created.