Some Jenkins changes and improvements.

-) Don't re-clone from github. We already have the directory here, just bind it, and copy it inside the docker container.
-) Let's properly set up our environment for asan.
-) Let's split the docker "run_jenkins" part into its own separate script.

tools/jenkins/docker_run_jenkins.sh

+#!/bin/bash
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# This script is invoked by run_jekins.sh when piggy-backing into docker.
+set -e
+
+export CONFIG=$config
+export ASAN_SYMBOLIZER_PATH=/usr/bin/llvm-symbolizer-3.5
+export CPPFLAGS=-I/tmp/prebuilt/include
+
+mkdir -p /var/local/git
+git clone --recursive /var/local/jenkins/grpc /var/local/git/grpc
+
+cd /var/local/git/grpc
+nvm use 0.12
+rvm use ruby-2.1
+tools/run_tests/prepare_travis.sh
+tools/run_tests/run_tests.py -t -c $config -l $language

tools/jenkins/grpc_jenkins_slave/Dockerfile

@@ -136,5 +136,7 @@ RUN wget http://www.dotdeb.org/dotdeb.gpg -O- | apt-key add -
 RUN apt-get update && apt-get install -y \
     git php5 php5-dev phpunit unzip
 
+RUN mkdir /var/local/jenkins
+
 # Define the default command.
 CMD ["bash"]

tools/jenkins/run_jenkins.sh

@@ -41,6 +41,10 @@ if [ "$platform" == "linux" ]
 then
   echo "building $language on Linux"
 
+  cd `dirname $0`/../..
+  git_root=`pwd`
+  cd -
+
   # Use image name based on Dockerfile checksum
   DOCKER_IMAGE_NAME=grpc_jenkins_slave_`sha1sum tools/jenkins/grpc_jenkins_slave/Dockerfile | cut -f1 -d\ `
 
@@ -57,17 +61,17 @@ then
   rm -f docker.cid
 
   # Run tests inside docker
-  docker run --cidfile=docker.cid $DOCKER_IMAGE_NAME bash -c -l "git clone --recursive $GIT_URL /var/local/git/grpc \
-    && cd /var/local/git/grpc \
-    $FETCH_PULL_REQUEST_CMD \
-    && git checkout -f $GIT_COMMIT \
-    && git submodule update \
-    && nvm use 0.12 \
-    && rvm use ruby-2.1 \
-    && CONFIG=$config tools/run_tests/prepare_travis.sh \
-    && CPPFLAGS=-I/tmp/prebuilt/include tools/run_tests/run_tests.py -t -c $config -l $language" || DOCKER_FAILED="true"
+  docker run \
+    -e "config=$config" \
+    -e "language=$language" \
+    -i \
+    -v "$git_root:/var/local/jenkins/grpc" \
+    --cidfile=docker.cid \
+    $DOCKER_IMAGE_NAME \
+    bash -l /var/local/jenkins/grpc/tools/jenkins/docker_run_jenkins.sh || DOCKER_FAILED="true"
 
   DOCKER_CID=`cat docker.cid`
+  docker kill $DOCKER_CID
   if [ "$DOCKER_FAILED" == "" ]
   then
     echo "Docker finished successfully, deleting the container $DOCKER_CID"