Updated CPP Travis build script to use cached dependencies. (#278)

pulsar-client-cpp/travis-build.sh

@@ -56,12 +56,22 @@ exec_cmd() {
 if [ "$3" = "all" -o "$3" = "dep" ]; then
   # Install dependant packages
   exec_cmd "apt-get update && apt-get install -y cmake gcc-4.4 cpp-4.4 gcc-4.4-base libssl-dev libcurl4-openssl-dev liblog4cxx10-dev libprotobuf-dev libboost1.55-all-dev libgtest-dev libxml2-utils g++-4.4";
-  exec_cmd "pushd $1/ && wget https://github.com/google/protobuf/releases/download/v2.6.1/protobuf-2.6.1.tar.gz && popd";
-  exec_cmd "pushd /usr/src/gtest && CC=gcc-4.4 CXX=g++-4.4 cmake . && make && cp *.a /usr/lib && popd";
-  exec_cmd "pushd $1/ && tar xvfz $1/protobuf-2.6.1.tar.gz && pushd $1/protobuf-2.6.1 && ./configure && make && make install && popd && popd";
+  if [ ! -f "$1/libgtest.a" ]; then
+    echo "Not Found: $1/libgtest.a"
+    exec_cmd "pushd /usr/src/gtest && CC=gcc-4.4 CXX=g++-4.4 cmake . && make && cp libgtest.a $1/ && popd";
+  fi
+  if [ ! -d "$1/protobuf-2.6.1/" ]; then
+    echo "Not Found: $1/protobuf-2.6.1/"
+    exec_cmd "pushd $1/ && wget https://github.com/google/protobuf/releases/download/v2.6.1/protobuf-2.6.1.tar.gz && popd";
+    exec_cmd "pushd $1/ && tar xvfz $1/protobuf-2.6.1.tar.gz && pushd $1/protobuf-2.6.1 && ./configure && make && make install && popd && popd";
+  else
+    echo "Found: $1/protobuf-2.6.1/"
+    exec_cmd "pushd $1/protobuf-2.6.1 && make install && popd"
+  fi
 fi
 
 if [ "$3" = "all" -o "$3" = "compile" ]; then
+  export PATH=$PATH:$1/
   # Compile and run unit tests
   exec_cmd "pushd $2/pulsar-client-cpp && CC=gcc-4.4 CXX=g++-4.4 cmake . && make && popd";
   PULSAR_STANDALONE_CONF=$2/pulsar-client-cpp/tests/standalone.conf $2/bin/pulsar standalone &