protobuf3: build env for using protobuf3

Don't much like doing it this way, but it's an example

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

proto/Dockerfile

@@ -0,0 +1,17 @@
+FROM fedora:latest
+
+ENV PROTO_VERSION 3.0.0-beta-1
+RUN dnf install -y wget tar autoconf automake make gcc gcc-c++ unzip libtool
+RUN wget https://github.com/google/protobuf/archive/v${PROTO_VERSION}.tar.gz && \
+    tar xf v${PROTO_VERSION}.tar.gz
+WORKDIR protobuf-${PROTO_VERSION}
+RUN ./autogen.sh && ./configure
+RUN make -j$(grep ^proc /proc/cpuinfo | wc -l)
+RUN make install -j$(grep ^proc /proc/cpuinfo | wc -l)
+WORKDIR /
+RUN dnf install -y golang git hg bzr
+ENV GOPATH /gopath
+ENV GOBIN /usr/bin
+RUN go get -u github.com/golang/protobuf/{proto,protoc-gen-go}
+VOLUME /proto /output
+CMD bash /proto/run.sh

proto/Makefile

@@ -14,6 +14,9 @@ CPP_SOURCE  := $(patsubst %.proto,$(CPP_DIR)/%.pb.cc,$(PROTO_FILES))
 CPP_HDR     := $(patsubst %.proto,$(CPP_DIR)/%.pb.h,$(PROTO_FILES))
 CPP_FILES   := $(CPP_SOURCE) $(CPP_HDR)
 
+DOCKER      ?= docker
+CWD         := $(shell pwd)
+
 default: example
 
 all: go py c cpp
@@ -45,6 +48,9 @@ $(PY_DIR)/%_pb2.py: %.proto
 	@mkdir -p $(PY_DIR)
 	protoc --python_out=$(PY_DIR) $^
 
+proto3: Dockerfile run.sh
+	$(DOCKER) build -t $@ . && $(DOCKER) run -it -v $(CWD):/proto:ro -v $(CWD)/output:/output:rw $@
+
 clean:
-	rm -rf *~ $(GO_FILES) $(C_FILES) $(PY_FILES) $(CPP_FILES)
+	rm -rf *~ $(GO_FILES) $(C_FILES) $(PY_FILES) $(CPP_FILES) $(CWD)/output
 

proto/run.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -e
+
+username="protobuild"
+groupname="${username}"
+p_dir="/proto/"
+o_dir="/output/"
+
+uid=$(stat -c "%u" "${p_dir}")
+gid=$(stat -c "%g" "${p_dir}")
+groupadd -g "${gid}" "${groupname}"
+adduser -u "${uid}" -g "${gid}" "${username}"
+chown -R "${username}:${groupname}" "${o_dir}"
+cd "${p_dir}"
+su "${username}" -c "make go py cpp DESTDIR='${o_dir}'"
+