jenkins: add node-test-commit-pre

All actions run before pending post-build-status-update job is run. My
thought is that node-test-commit sub jobs will `curl` from master, and
then pipe to bash.

PR-URL: #1004
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

jenkins/scripts/node-test-commit-pre.sh

@@ -0,0 +1,68 @@
+###
+# node-test-commit-pre
+# All actions run before pending post-build-status-update job is run
+###
+
+# Git
+git --version
+
+# Name and email in git config need to be the same across all jobs
+# so that git rebase --committer-date-is-author-date will produce
+# the same commit SHA1
+git config --replace-all user.name Dummy
+git config --replace-all user.email dummy@dummy.com
+git config user.name
+git config user.email
+echo $GIT_COMMITTER_NAME
+echo $GIT_AUTHOR_NAME
+
+git rebase --abort || true
+git checkout -f refs/remotes/origin/_jenkins_local_branch
+git config user.name
+git config user.email
+echo $GIT_COMMITTER_NAME
+echo $GIT_AUTHOR_NAME
+
+git status
+git rev-parse HEAD
+git rev-parse $REBASE_ONTO
+
+if [ -n "${REBASE_ONTO}" ]; then
+  git rebase --committer-date-is-author-date $REBASE_ONTO
+fi
+
+if [ -n "${POST_REBASE_SHA1_CHECK}" ]; then
+  check_sha1=${POST_REBASE_SHA1_CHECK}
+  head_sha1=$(git rev-parse HEAD)
+  if [ "$head_sha1" != "$check_sha1" ]; then
+    exit 1
+  fi
+fi
+
+# Diagnostics
+set +x
+DIAGFILE=${HOME}/jenkins_diagnostics.txt
+echo >> ${DIAGFILE}
+echo >> ${DIAGFILE}
+echo >> ${DIAGFILE}
+TS="`date`"
+echo $TS
+echo $TS >> ${DIAGFILE}
+echo "Before building" >> ${DIAGFILE}
+echo $BUILD_TAG >> ${DIAGFILE}
+echo $BUILD_URL >> ${DIAGFILE}
+echo $NODE_NAME >> ${DIAGFILE}
+echo >> ${DIAGFILE}
+echo "netstat -anp" >> ${DIAGFILE}
+netstat -anp >> ${DIAGFILE} 2>&1 || true
+echo >> ${DIAGFILE}
+echo "netstat -gn" >> ${DIAGFILE}
+netstat -gn >> ${DIAGFILE} 2>&1 || true
+echo >> ${DIAGFILE}
+echo "ps auxww" >> ${DIAGFILE}
+ps auxww >> ${DIAGFILE} 2>&1 || true
+mv ${DIAGFILE} ${DIAGFILE}-OLD || true
+tail -c 20000000 ${DIAGFILE}-OLD > ${DIAGFILE} || true
+rm ${DIAGFILE}-OLD || true
+set -x
+pgrep node || true