Add VIRL host selection mechanism to bootstrap

Add a mechanism to the bootstrap script that allows it to select
one out of multiple candidate VIRL hosts. In addition, fix a few
cosmetic issues wrt. connecting to the VIRL host:
* Use consistent set of SSH options
* Consistently use constant instead of hardcoded key filename
* Use relative path names for start-/stop-testcase scripts

Change-Id: I0d2972f170de82dd5d98da88656f5f962fca2415
Signed-off-by: Carsten Koester <ckoester@cisco.com>

1 files changed, 52 insertions, 12 deletions

diff --git a/bootstrap.sh b/bootstrap.sh
index 3f29f9856e..d1ca2f4606 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -21,16 +21,22 @@ export DEBIAN_FRONTEND=noninteractive
 sudo apt-get -y update
 sudo apt-get -y install libpython2.7-dev python-virtualenv
 
+VIRL_SERVERS=("10.30.51.28" "10.30.51.29" "10.30.51.30")
+VIRL_SERVER=""
+
+VIRL_USERNAME=jenkins-in
+VIRL_PKEY=priv_key
+VIRL_SERVER_STATUS_FILE="status"
+VIRL_SERVER_EXPECTED_STATUS="PRODUCTION"
+
+SSH_OPTIONS="-i ${VIRL_PKEY} -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o BatchMode=yes -o LogLevel=error"
+
 function ssh_do() {
     echo
     echo "### "  ssh $@
-    ssh -i priv_key -o StrictHostKeyChecking=no $@
+    ssh ${SSH_OPTIONS} $@
 }
 
-VIRL_SERVER=10.30.51.28
-VIRL_USERNAME=jenkins-in
-VIRL_PKEY=priv_key
-
 rm -f ${VIRL_PKEY}
 cat > ${VIRL_PKEY} <<EOF
 -----BEGIN RSA PRIVATE KEY-----
@@ -61,7 +67,41 @@ cWsudXjMki8734WSpMBqBp/J8wG3C9ZS6IpQD+U7UXA+roB7Qr+j4TqtWfM+87Rh
 maOpG56uAyR0w5Z9BhwzA3VakibVk9KwDgZ29WtKFzuATLFnOtCS46E=
 -----END RSA PRIVATE KEY-----
 EOF
-chmod 600 priv_key
+chmod 600 ${VIRL_PKEY}
+
+#
+# Pick a random host from the array of VIRL servers, and attempt
+# to reach it and verify it's status.
+#
+# The server must be reachable, and have a "status" file with
+# the content "PRODUCTION", to be selected.
+#
+# If the server is not reachable, or does not have the correct
+# status, remove it from the array and start again.
+#
+# Abort if there are no more servers left in the array.
+#
+while [[ ! "$VIRL_SERVER" ]]
+do
+    num_hosts=${#VIRL_SERVERS[@]}
+    if [ $num_hosts == 0 ]
+    then
+        echo "No more VIRL candidate hosts available, failing."
+        exit 127
+    fi
+    element=$[ $RANDOM % $num_hosts ]
+    virl_server_candidate=${VIRL_SERVERS[$element]}
+    virl_server_status=$(ssh ${SSH_OPTIONS} ${VIRL_USERNAME}@${virl_server_candidate} cat $VIRL_SERVER_STATUS_FILE 2>&1)
+    echo VIRL HOST $virl_server_candidate status is \"$virl_server_status\"
+    if [ "$virl_server_status" == "$VIRL_SERVER_EXPECTED_STATUS" ]
+    then
+        # Candidate is in good status. Select this server.
+        VIRL_SERVER="$virl_server_candidate"
+    else
+        # Candidate is in bad status. Remove from array.
+        VIRL_SERVERS=("${VIRL_SERVERS[@]:0:$element}" "${VIRL_SERVERS[@]:$[$element+1]}")
+    fi
+done
 
 # Temporarily download VPP packages from nexus.fd.io
 
@@ -94,7 +134,7 @@ echo "Updated file names: " ${VPP_DEBS_FULL[@]}
 
 cat ${VIRL_PKEY}
 # Copy the files to VIRL host
-scp -i ${VIRL_PKEY} -o StrictHostKeyChecking=no *.deb \
+scp ${SSH_OPTIONS} *.deb \
     ${VIRL_USERNAME}@${VIRL_SERVER}:${VIRL_DIR_LOC}/
 
 result=$?
@@ -108,13 +148,13 @@ fi
 echo "Starting simulation on VIRL server"
 
 function stop_virl_simulation {
-    ssh -i priv_key -o StrictHostKeyChecking=no ${VIRL_USERNAME}@${VIRL_SERVER}\
-        "/home/jenkins-in/testcase-infra/bin/stop-testcase ${VIRL_SID}"
+    ssh ${SSH_OPTIONS} ${VIRL_USERNAME}@${VIRL_SERVER}\
+        "stop-testcase ${VIRL_SID}"
 }
 
-VIRL_SID=$(ssh -i priv_key -o StrictHostKeyChecking=no \
+VIRL_SID=$(ssh ${SSH_OPTIONS} \
     ${VIRL_USERNAME}@${VIRL_SERVER} \
-    "/home/jenkins-in/testcase-infra/bin/start-testcase -c double-ring-nested ${VPP_DEBS_FULL[@]}")
+    "start-testcase -c double-ring-nested ${VPP_DEBS_FULL[@]}")
 retval=$?
 if [ "$?" -ne "0" ]; then
     echo "VIRL simulation start failed"
@@ -133,7 +173,7 @@ echo ${VIRL_SID}
 ssh_do ${VIRL_USERNAME}@${VIRL_SERVER} cat /scratch/${VIRL_SID}/topology.yaml
 
 # Download the topology file from virl session
-scp -i ${VIRL_PKEY} -o StrictHostKeyChecking=no \
+scp ${SSH_OPTIONS} \
     ${VIRL_USERNAME}@${VIRL_SERVER}:/scratch/${VIRL_SID}/topology.yaml \
     topologies/enabled/topology.yaml