Build protoc in Travis

This mostly fixes the Travis-CI build.

Author: ejona86

.buildscript/build-proto.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -ev
+
+PROTO_VERSION="$1"
+PROTO_FOLDER="/tmp/proto$PROTO_VERSION"
+
+# Can't check for presence of directory as cache auto-creates it.
+if [ ! -f "$PROTO_FOLDER/bin/protoc" ]; then
+ wget -O - "https://github.com/google/protobuf/archive/v${PROTO_VERSION}.tar.gz" | tar xz -C /tmp
+ cd "/tmp/protobuf-${PROTO_VERSION}"
+ ./autogen.sh
+ ./configure --prefix="$PROTO_FOLDER" --disable-shared
+ make -j2
+ make install
+fi
+echo "protoc is available at $PROTO_FOLDER/bin/protoc"

.travis.yml

@@ -1,6 +1,24 @@
+sudo: false
+
 language: java
+
+notifications:
+ email: false
+
+env:
+ global:
+ - PROTO_VERSION=2.4.1
+ - PATH="/tmp/proto$PROTO_VERSION/bin:$PATH"
+
 jdk:
  - oraclejdk8
  - oraclejdk7
  - openjdk7
  - openjdk6
+
+before_install:
+ - .buildscript/build-proto.sh $PROTO_VERSION
+
+cache:
+ directories:
+ - /tmp/proto$PROTO_VERSION