check the return value

Change-Id: Id507ba1a139415b395f99cd3fcbe2581e1fe3f54
Signed-off-by: Fangyin Hu <fangyinx.hu@intel.com>

2 files changed, 590 insertions, 0 deletions

diff --git a/bootstrap-TLDK.sh b/bootstrap-TLDK.sh
new file mode 100755
index 0000000000..f974ab886f
--- /dev/null
+++ b/bootstrap-TLDK.sh
@@ -0,0 +1,217 @@
+#!/bin/bash
+# Copyright (c) 2016 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -x
+
+cat /etc/hostname
+cat /etc/hosts
+
+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 ${VIRL_PKEY} -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o BatchMode=yes -o LogLevel=error"
+
+DPDK_VERSION=16.07
+DPDK_DIR=dpdk-${DPDK_VERSION}
+DPDK_PACKAGE=${DPDK_DIR}.tar.xz
+
+function ssh_do() {
+    echo
+    echo "### "  ssh $@
+    ssh ${SSH_OPTIONS} $@
+}
+
+rm -f ${VIRL_PKEY}
+cat > ${VIRL_PKEY} <<EOF
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
+EOF
+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 TLDK packages from nexus.fd.io
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+if [ "${#}" -ne "0" ]; then
+    arr=(${@})
+    echo ${arr[0]}
+else
+    ## we need to download the TLDK and DPDK test files to this local host, maybe use scp or wget
+    ## download DPDK source code from the fast.dpdk.org
+    ## download TLDK source code from the gerrit.fd.io
+    ## download some pcap file and .deb packages from the nexus.fd.io
+    wget -q "fast.dpdk.org/rel/${DPDK_PACKAGE}"
+    git clone https://gerrit.fd.io/r/tldk
+    wget -q "https://nexus.fd.io/tldk/test_ipv4_assemble_rx.pcap" -P ./TLDK-tests/tldk_testconfig
+    wget -q "https://nexus.fd.io/tldk/test_ipv4_checksum_rx.pcap" -P ./TLDK-tests/tldk_testconfig
+    wget -q "https://nexus.fd.io/tldk/test_ipv4_fragment_rx.pcap" -P ./TLDK-tests/tldk_testconfig
+    wget -q "https://nexus.fd.io/tldk/test_ipv6_checksum_rx.pcap" -P ./TLDK-tests/tldk_testconfig
+    wget -q "https://nexus.fd.io/tldk/test_ipv6_fragment_rx.pcap" -P ./TLDK-tests/tldk_testconfig
+fi
+
+#we will pack all the TLDK depend files and copy it to the VIRL_SERVER
+VIRL_DIR_LOC="/tmp"
+TLDK_TAR_FILE="tldk_depends.tar.gz"
+
+tar zcf ${TLDK_TAR_FILE} dpdk-16.07.tar.xz ./tldk/ \
+    ./TLDK-tests/tldk_testconfig/ ./TLDK-tests/tldk_deplibs/
+
+cat ${VIRL_PKEY}
+# Copy the files to VIRL host
+scp ${SSH_OPTIONS} ${TLDK_TAR_FILE} \
+    ${VIRL_USERNAME}@${VIRL_SERVER}:${VIRL_DIR_LOC}/
+
+result=$?
+if [ "${result}" -ne "0" ]; then
+    echo "Failed to copy tldk package file to virl host"
+    echo ${result}
+    exit ${result}
+fi
+
+# Start a simulation on VIRL server
+echo "Starting simulation on VIRL server"
+
+VIRL_TOPOLOGY=double-ring-nested.xenial
+VIRL_RELEASE=csit-ubuntu-16.04.1_2016-11-28_1.5
+
+function stop_virl_simulation {
+    ssh ${SSH_OPTIONS} ${VIRL_USERNAME}@${VIRL_SERVER}\
+        "stop-testcase ${VIRL_SID}"
+}
+
+# Upon script exit, cleanup the simulation execution
+trap stop_virl_simulation EXIT
+
+# use the start-testcase-TLDK for the TLDK test case
+VIRL_SID=$(ssh ${SSH_OPTIONS} \
+    ${VIRL_USERNAME}@${VIRL_SERVER} \
+    "start-testcase-TLDK -c ${VIRL_TOPOLOGY} -r ${VIRL_RELEASE} ${VIRL_DIR_LOC}/${TLDK_TAR_FILE}")
+retval=$?
+if [ "${retval}" -ne "0" ]; then
+    echo "VIRL simulation start failed"
+    exit ${retval}
+fi
+
+if [[ ! "${VIRL_SID}" =~ session-[a-zA-Z0-9_]{6} ]]; then
+    echo "No VIRL session ID reported."
+    exit 127
+fi
+
+echo ${VIRL_SID}
+
+ssh_do ${VIRL_USERNAME}@${VIRL_SERVER} cat /scratch/${VIRL_SID}/topology.yaml
+
+# Download the topology file from virl session
+scp ${SSH_OPTIONS} \
+    ${VIRL_USERNAME}@${VIRL_SERVER}:/scratch/${VIRL_SID}/topology.yaml \
+    topologies/enabled/topology.yaml
+
+retval=$?
+if [ "${retval}" -ne "0" ]; then
+    echo "Failed to copy topology file from VIRL simulation"
+    exit ${retval}
+fi
+
+# create a python virtual environment env
+virtualenv --system-site-packages env
+. env/bin/activate
+
+echo pip install
+pip install -r ${SCRIPT_DIR}/requirements.txt
+
+pykwalify -s ${SCRIPT_DIR}/resources/topology_schemas/3_node_topology.sch.yaml \
+          -s ${SCRIPT_DIR}/resources/topology_schemas/topology.sch.yaml \
+          -d ${SCRIPT_DIR}/topologies/enabled/topology.yaml \
+          -vvv
+
+if [ "$?" -ne "0" ]; then
+    echo "Topology schema validation failed."
+    echo "However, the tests will start."
+fi
+
+PYTHONPATH=`pwd` pybot -L TRACE -W 150 \
+    -v TOPOLOGY_PATH:${SCRIPT_DIR}/topologies/enabled/topology.yaml \
+    --suite "TLDK-tests.func" \
+    --include vm_envAND3_node_single_link_topo \
+    --exclude PERFTEST \
+    --exclude SKIP_PATCH \
+    --noncritical EXPECTED_FAILING \
+    TLDK-tests/
diff --git a/resources/tools/virl/bin/start-testcase-TLDK b/resources/tools/virl/bin/start-testcase-TLDK
new file mode 100755
index 0000000000..263e8beb90
--- /dev/null
+++ b/resources/tools/virl/bin/start-testcase-TLDK
@@ -0,0 +1,373 @@
+#!/usr/bin/python
+
+# Copyright (c) 2016 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+__author__ = 'fangyinx.hu@intel.com'
+
+import sys
+import requests
+import re
+import os
+import argparse
+import tempfile
+import shutil
+import time
+import paramiko
+import netifaces
+
+#
+# Helper function to indent a text string
+#
+def indent(lines, amount, fillchar=' '):
+    padding = amount * fillchar
+    return padding + ('\n'+padding).join(lines.split('\n'))
+
+#
+# Main function.
+# FIXME: Right now, this is really coded like a shell script, as one big
+# function executed in sequence. This should be broken down into multiple
+# functions.
+#
+def main():
+    #
+    # Get our default interface IP address. This will become the default
+    # value for the "NFS Server IP" option.
+    #
+    gws = netifaces.gateways()
+    addrs = netifaces.ifaddresses(gws['default'][netifaces.AF_INET][1])
+    default_addr = addrs[netifaces.AF_INET][0]['addr']
+
+    #
+    # Verify CLI parameters and try to download our VPP image into a temporary
+    # file first
+    #
+    parser = argparse.ArgumentParser()
+    parser.add_argument("topology", help="the base topology to be started")
+    parser.add_argument("packages", help="Path to the tldk package file that " +
+                        "is/are to be installed", nargs='+')
+    parser.add_argument("-c", "--copy", help="Copy the tldk packages, " +
+                        "leaving the originals in place. Default is to " +
+                        "move them.", action='store_true')
+    parser.add_argument("-k", "--keep", help="Keep (do not delete) the " +
+                        "simulation in case of error", action='store_true')
+    parser.add_argument("-v", "--verbosity", action="count", default=0)
+    parser.add_argument("-nip", "--nfs-server-ip", help="NFS server (our) IP " +
+                        "default is derived from routing table: " +
+                        "{}".format(default_addr), default=default_addr)
+    parser.add_argument("-ns", "--nfs-scratch-directory",
+                        help="Server location for NFS scratch diretory",
+                        default="/nfs/scratch")
+    parser.add_argument("-nc", "--nfs-common-directory",
+                        help="Server location for NFS common (read-only) " +
+                        "directory", default="/nfs/common")
+    parser.add_argument("-wc", "--wait-count",
+                        help="number of intervals to wait for simulation to " +
+                        "be ready", type=int, default=24)
+    parser.add_argument("-wt", "--wait-time",
+                        help="length of a single interval to wait for " +
+                        "simulation to be ready", type=int, default=5)
+    parser.add_argument("-vip", "--virl-ip",
+                        help="VIRL IP and Port (e.g. 127.0.0.1:19399)",
+                        default="127.0.0.1:19399")
+    parser.add_argument("-u", "--username", help="VIRL username",
+                        default="tb4-virl")
+    parser.add_argument("-p", "--password", help="VIRL password",
+                        default="Cisco1234")
+    parser.add_argument("-su", "--ssh-user", help="SSH username",
+                        default="cisco")
+    parser.add_argument("-spr", "--ssh-privkey", help="SSH private keyfile",
+                        default="/home/jenkins-in/.ssh/id_rsa_virl")
+    parser.add_argument("-spu", "--ssh-pubkey", help="SSH public keyfile",
+                        default="/home/jenkins-in/.ssh/id_rsa_virl.pub")
+    parser.add_argument("-r", "--release", help="VM disk image/release " +
+                        "(ex. \"csit-ubuntu-14.04.4_2016-05-25_1.0\")",
+                        default="csit-ubuntu-14.04.4_2016-05-25_1.0")
+    parser.add_argument("--topology-directory", help="Topology directory",
+                        default="/home/jenkins-in/testcase-infra/topologies")
+
+    args = parser.parse_args()
+
+    #
+    # Check if topology and template exist
+    #
+    if args.verbosity >= 2:
+        print "DEBUG: Running with topology {}".format(args.topology)
+
+    topology_virl_filename = os.path.join(args.topology_directory,
+                                          args.topology + ".virl")
+    topology_yaml_filename = os.path.join(args.topology_directory,
+                                          args.topology + ".yaml")
+
+    if not os.path.isfile(topology_virl_filename):
+        print "ERROR: Topology VIRL file {} does not exist".\
+            format(topology_virl_filename)
+        sys.exit(1)
+    if not os.path.isfile(topology_yaml_filename):
+        print "ERROR: Topology YAML file {} does not exist".\
+            format(topology_yaml_filename)
+        sys.exit(1)
+
+    #
+    # Check if TLDK package exists
+    #
+    for package in args.packages:
+        if args.verbosity >= 2:
+            print "DEBUG: Checking if file {} exists".format(package)
+        if not os.path.isfile(package):
+            print "ERROR: TLDK package {} does not exist.".format(package)
+            sys.exit(1)
+
+    #
+    # Start VIRL topology
+    #
+    if args.verbosity >= 1:
+        print "DEBUG: Starting VIRL topology"
+    temp_handle, temp_topology = tempfile.mkstemp()
+    with open(args.ssh_pubkey, 'r') as pubkey_file:
+        pub_key = pubkey_file.read().replace('\n', '')
+    with open(temp_topology, 'w') as new_file, \
+        open(topology_virl_filename, 'r') as old_file:
+        for line in old_file:
+            line = line.replace("  - VIRL-USER-SSH-PUBLIC-KEY", "  - "+pub_key)
+            line = line.replace("$$NFS_SERVER_SCRATCH$$", \
+                args.nfs_server_ip+":"+args.nfs_scratch_directory)
+            line = line.replace("$$NFS_SERVER_COMMON$$", \
+                args.nfs_server_ip+":"+args.nfs_common_directory)
+            line = line.replace("$$VM_IMAGE$$", "server-"+args.release)
+            new_file.write(line)
+    os.close(temp_handle)
+
+    try:
+        new_file = open(temp_topology, 'rb')
+        headers = {'Content-Type': 'text/xml'}
+        req = requests.post('http://' + args.virl_ip + '/simengine/rest/launch',
+                            headers=headers,
+                            auth=(args.username, args.password), data=new_file)
+        if args.verbosity >= 2:
+            print "DEBUG: - Response Code {}".format(req.status_code)
+        new_file.close()
+
+    except:
+        print "ERROR: Launching VIRL simulation - received invalid response"
+        print req
+        os.remove(temp_topology)
+        sys.exit(1)
+
+    if req.status_code != 200:
+        print "ERROR: Launching VIRL simulation - received status other " + \
+            "than 200 HTTP OK"
+        print "Status was: {} \n".format(req.status_code)
+        print "Response content was: "
+        print req.content
+        os.remove(temp_topology)
+        sys.exit(1)
+
+    # If we got here, we had a good response. The response content is the
+    # session ID.
+    session_id = req.content
+
+    #
+    # Create simulation scratch directory. Move topology file into that
+    # directory. Copy or move TLDK packages into that directory.
+    #
+    scratch_directory = os.path.join(args.nfs_scratch_directory, session_id)
+    os.mkdir(scratch_directory)
+    shutil.move(temp_topology, os.path.join(scratch_directory,
+                                            "virl_topology.virl"))
+    os.mkdir(os.path.join(scratch_directory, "tldktest"))
+    for package in args.packages:
+        if args.copy:
+            shutil.copy(package, os.path.join(scratch_directory, "tldktest",
+                                              os.path.basename(package)))
+        else:
+            shutil.move(package, os.path.join(scratch_directory, "tldktest",
+                                              os.path.basename(package)))
+
+    #
+    # Wait for simulation to become active
+    #
+    if args.verbosity >= 1:
+        print "DEBUG: Waiting for simulation to become active"
+
+    sim_is_started = False
+    nodelist = []
+
+    count = args.wait_count
+    while (count > 0) and not sim_is_started:
+        time.sleep(args.wait_time)
+        count -= 1
+
+        req = requests.get('http://' + args.virl_ip + '/simengine/rest/nodes/' +
+                           session_id, auth=(args.username, args.password))
+        data = req.json()
+
+        active = 0
+        total = 0
+
+        # Flush the node list every time, keep the last one
+        nodelist = []
+
+        # Hosts are the keys of the inner dictionary
+        for key in data[session_id].keys():
+            if data[session_id][key]['management-proxy'] == "self":
+                continue
+            nodelist.append(key)
+            total += 1
+            if data[session_id][key]['state'] == "ACTIVE":
+                active += 1
+        if args.verbosity >= 2:
+            print "DEBUG: - Attempt {} out of {}, total {} hosts, {} active".\
+                format(args.wait_count-count, args.wait_count, total, active)
+        if active == total:
+            sim_is_started = True
+
+    if not sim_is_started:
+        print "ERROR: Simulation started OK but devices never changed to " + \
+            "ACTIVE state"
+        print "Last VIRL response:"
+        print data
+        if not args.keep:
+            shutil.rmtree(scratch_directory)
+            req = requests.get('http://' + args.virl_ip +
+                               '/simengine/rest/stop/' + session_id,
+                               auth=(args.username, args.password))
+
+    if args.verbosity >= 2:
+        print "DEBUG: Nodes: " + ", ".join(nodelist)
+
+    #
+    # Fetch simulation's IPs and create files
+    # (ansible hosts file, topology YAML file)
+    #
+    req = requests.get('http://' + args.virl_ip +
+                       '/simengine/rest/interfaces/' + session_id +
+                       '?fetch-state=1', auth=(args.username, args.password))
+    data = req.json()
+
+    # Populate node addresses
+    nodeaddrs = {}
+    topology = {}
+    for key in nodelist:
+        nodetype = re.split('[0-9]', key)[0]
+        if not nodetype in nodeaddrs:
+            nodeaddrs[nodetype] = {}
+        nodeaddrs[nodetype][key] = re.split('\\/', \
+            data[session_id][key]['management']['ip-address'])[0]
+        if args.verbosity >= 2:
+            print "DEBUG: Node {} is of type {} and has management IP {}".\
+                format(key, nodetype, nodeaddrs[nodetype][key])
+
+        topology[key] = {}
+        for key2 in data[session_id][key]:
+            topology[key]["nic-"+key2] = data[session_id][key][key2]
+            if 'ip-address' in topology[key]["nic-"+key2]:
+                if topology[key]["nic-"+key2]['ip-address'] is not None:
+                    topology[key]["nic-"+key2]['ip-addr'] = re.split('\\/', \
+                        topology[key]["nic-"+key2]['ip-address'])[0]
+
+    # Write ansible file
+    ansiblehosts = open(os.path.join(scratch_directory, 'ansible-hosts'), 'w')
+    for key1 in nodeaddrs:
+        ansiblehosts.write("[{}]\n".format(key1))
+        for key2 in nodeaddrs[key1]:
+            ansiblehosts.write("{} hostname={}\n".format(nodeaddrs[key1][key2],
+                                                         key2))
+    ansiblehosts.close()
+
+    # Process topology YAML template
+    with open(args.ssh_privkey, 'r') as privkey_file:
+        priv_key = indent(privkey_file.read(), 6)
+
+    with open(os.path.join(scratch_directory, "topology.yaml"), 'w') as \
+        new_file, open(topology_yaml_filename, 'r') as old_file:
+        for line in old_file:
+            new_file.write(line.format(priv_key=priv_key, topology=topology))
+
+    #
+    # Wait for hosts to become reachable over SSH
+    #
+    if args.verbosity >= 1:
+        print "DEBUG: Waiting for hosts to become reachable using SSH"
+
+    missing = -1
+    count = args.wait_count
+    while (count > 0) and missing != 0:
+        time.sleep(args.wait_time)
+        count -= 1
+
+        missing = 0
+        for key in nodelist:
+            if not os.path.exists(os.path.join(scratch_directory, key)):
+                missing += 1
+        if args.verbosity >= 2:
+            print "DEBUG: - Attempt {} out of {}, waiting for {} hosts".\
+                format(args.wait_count-count, args.wait_count, missing)
+
+    if missing != 0:
+        print "ERROR: Simulation started OK but {} hosts ".format(missing) + \
+            "never mounted their NFS directory"
+        if not args.keep:
+            shutil.rmtree(scratch_directory)
+            req = requests.get('http://' + args.virl_ip +
+                               '/simengine/rest/stop/' + session_id,
+                               auth=(args.username, args.password))
+
+    #
+    # just decompress the TLDK tar packages
+    #
+    if args.verbosity >= 1:
+        print "DEBUG: Uprading TLDK"
+
+    for key1 in nodeaddrs:
+        if not key1 == 'tg':
+            for key2 in nodeaddrs[key1]:
+                ipaddr = nodeaddrs[key1][key2]
+                if args.verbosity >= 2:
+                    print "DEBUG: Upgrading TLDK on node {}".format(ipaddr)
+                paramiko.util.log_to_file(os.path.join(scratch_directory,
+                                                       "ssh.log"))
+                client = paramiko.SSHClient()
+                client.load_system_host_keys()
+                client.load_host_keys("/dev/null")
+                client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
+                client.connect(ipaddr, username=args.ssh_user,
+                               key_filename=args.ssh_privkey)
+                stdin, stdout, stderr = \
+                    client.exec_command('cd /scratch/tldktest/ && sudo tar zxf tldk_depends.tar.gz')
+                c_stdout = stdout.read()
+                c_stderr = stderr.read()
+                if args.verbosity >= 2:
+                    print "DEBUG: Command output was:"
+                    print c_stdout
+                    print "DEBUG: Command stderr was:"
+                    print c_stderr
+
+    #
+    # Write a file with timestamp to scratch directory. We can use this to track
+    # how long a simulation has been running.
+    #
+    with open(os.path.join(scratch_directory, 'start_time'), 'a') as \
+        timestampfile:
+        timestampfile.write('{}\n'.format(int(time.time())))
+
+    #
+    # Declare victory
+    #
+    if args.verbosity >= 1:
+        print "SESSION ID: {}".format(session_id)
+
+    print "{}".format(session_id)
+
+if __name__ == "__main__":
+    sys.exit(main())