Removed warden; moved to separate repo.

Change-Id: I76ae777891ad3256f1bb30f11c17c0aebfc1ed5d

-#!/bin/bash
-# Creates a cell definition from the given name and LXC info
-
-name="$1"
-apps="${2:-drivers,openflow,proxyarp,mobility,pathpainter}"
-
-echo "export ONOS_CELL=borrow"
-echo "export ONOS_NIC=\"10.128.11.*\""
-
-sudo lxc-ls -F "name,ipv4" --fancy | grep $name | \
-    sed "s/^$name-/OC/" | tr "[:lower:]" "[:upper:]" | \
-    sed -r 's/[ ]+/\=/;s/^/export /'
-
-echo "export OCT=\"10.128.11.1\""
-echo "export ONOS_USER=sdn"
-echo "export ONOS_USE_SSH=true"
-echo "export ONOS_APPS=${apps}"
-echo "export ONOS_WEB_USER=onos"
-echo "export ONOS_WEB_PASS=rocks"

-#!/bin/bash
-# Creates a new node from the base image.
-
-base="$1"
-ip="$2"
-name="$3"
-shift 3
-key="$@"
-
-sudo lxc-clone -o $base -n $name
-
-sudo chmod 777 /var/lib/lxc
-sudo chmod 777 /var/lib/lxc/$name
-sudo chmod 666 /var/lib/lxc/$name/config
-
-sudo cat >>/var/lib/lxc/$name/config <<EOF
-lxc.network.ipv4 = ${ip}/16
-lxc.network.ipv4.gateway = 10.128.0.1
-EOF
-
-sudo chmod 644 /var/lib/lxc/$name/config
-sudo chmod 750 /var/lib/lxc/$name
-sudo chmod 700 /var/lib/lxc
-
-sudo lxc-start -d -n $name
-sudo lxc-attach -n $name -- ping -c1 8.8.8.8
-sudo lxc-attach -n $name -- bash -c "echo $key >> /home/sdn/.ssh/authorized_keys"
-sudo lxc-attach -n $name -- bash -c "sed -i \"s/127.0.1.1.*/127.0.1.1   $name/\" /etc/hosts"

-#!/bin/bash
-# Creates a new cell.
-
-name="$1"
-ipx="$2"
-spec="$3"
-shift 3
-key="$@"
-
-cd $(dirname $0)
-
-nodes=${spec%+*}
-mininet=${spec#*+}
-
-sudo lxc-attach -n bit-proxy -- bash -c "grep -qF \"$key\" /home/sdn/.ssh/authorized_keys || echo $key >> /home/sdn/.ssh/authorized_keys"
-
-if [ $mininet -ge 1 ]; then
-    ./clone-node base-mininet ${ipx/x/0} $name-n "$key"
-fi
-
-let n=1
-while [ $n -le $nodes ]; do
-    ./clone-node base-onos ${ipx/x/$n} $name-$n "$key"
-    let n=n+1
-done

-#!/bin/bash
-# Destroys an LXC cell with the specified name.
-
-name=$1
-spec=$2
-
-nodes=${spec%+*}
-mininet=${spec#*+}
-
-cd $(dirname $0)
-
-if [ $mininet -ge 1 ]; then
-    ./destroy-node $name-n
-fi
-
-let n=1
-while [ $n -le $nodes ]; do
-    ./destroy-node $name-$n
-    let n=n+1
-done

-#!/bin/bash
-# Destroys an LXC node with the specified name.
-
-name=$1
-[ "$name" = "onos-base" ] && echo "Don't do that!" && exit 1
-[ "$name" = "mininet-base" ] && echo "Don't do that!" && exit 1
-
-sudo lxc-stop -n $name
-sudo lxc-destroy -n $name

-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-  ~ Copyright 2015-present Open Networking Laboratory
-  ~
-  ~ 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.
-  -->
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-
-    <parent>
-        <groupId>org.onosproject</groupId>
-        <artifactId>onlab-utils</artifactId>
-        <version>1.6.0-SNAPSHOT</version>
-        <relativePath>../pom.xml</relativePath>
-    </parent>
-
-    <artifactId>onlab-warden</artifactId>
-    <packaging>jar</packaging>
-
-    <description>System Test Cell Warden</description>
-
-    <dependencies>
-        <dependency>
-            <groupId>org.eclipse.jetty</groupId>
-            <artifactId>jetty-server</artifactId>
-            <version>8.1.18.v20150929</version>
-        </dependency>
-        <dependency>
-            <groupId>org.eclipse.jetty</groupId>
-            <artifactId>jetty-servlet</artifactId>
-            <version>8.1.18.v20150929</version>
-        </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>4.12</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.onosproject</groupId>
-            <artifactId>onlab-misc</artifactId>
-            <version>${project.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.onosproject</groupId>
-            <artifactId>onlab-junit</artifactId>
-            <scope>test</scope>
-        </dependency>
-    </dependencies>
-
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-shade-plugin</artifactId>
-                <version>2.4.3</version>
-                <configuration>
-                    <transformers>
-                        <transformer
-                                implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
-                            <mainClass>org.onlab.warden.Main</mainClass>
-                        </transformer>
-                    </transformers>
-                    <filters>
-                        <filter>
-                            <artifact>*:*</artifact>
-                            <excludes>
-                                <exclude>META-INF/*.SF</exclude>
-                                <exclude>META-INF/*.DSA</exclude>
-                                <exclude>META-INF/*.RSA</exclude>
-                            </excludes>
-                        </filter>
-                    </filters>
-                </configuration>
-                <executions>
-                    <execution>
-                        <phase>package</phase>
-                        <goals>
-                            <goal>shade</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-plugin</artifactId>
-            </plugin>
-        </plugins>
-    </build>
-
-</project>

-/*
- * Copyright 2016 Open Networking Laboratory
- *
- * 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.
- */
-
-package org.onlab.warden;
-
-import org.eclipse.jetty.server.Server;
-import org.eclipse.jetty.servlet.ServletHandler;
-import org.eclipse.jetty.util.log.Logger;
-
-/**
- * Main program for executing scenario test warden.
- */
-public final class Main {
-
-    // Public construction forbidden
-    private Main(String[] args) {
-    }
-
-    /**
-     * Main entry point for the cell warden.
-     *
-     * @param args command-line arguments
-     */
-    public static void main(String[] args) {
-        Main main = new Main(args);
-        main.run();
-    }
-
-    // Runs the warden processing
-    private void run() {
-        startWebServer();
-    }
-
-    // Initiates a web-server.
-    private static void startWebServer() {
-        WardenServlet.warden = new Warden();
-        org.eclipse.jetty.util.log.Log.setLog(new NullLogger());
-        Server server = new Server(4321);
-        ServletHandler handler = new ServletHandler();
-        server.setHandler(handler);
-        handler.addServletWithMapping(WardenServlet.class, "/*");
-        try {
-            server.start();
-        } catch (Exception e) {
-            print("Warden already active...");
-        }
-    }
-
-    private static void print(String s) {
-        System.out.println(s);
-    }
-
-    // Logger to quiet Jetty down
-    private static class NullLogger implements Logger {
-        @Override
-        public String getName() {
-            return "quiet";
-        }
-
-        @Override
-        public void warn(String msg, Object... args) {
-        }
-
-        @Override
-        public void warn(Throwable thrown) {
-        }
-
-        @Override
-        public void warn(String msg, Throwable thrown) {
-        }
-
-        @Override
-        public void info(String msg, Object... args) {
-        }
-
-        @Override
-        public void info(Throwable thrown) {
-        }
-
-        @Override
-        public void info(String msg, Throwable thrown) {
-        }
-
-        @Override
-        public boolean isDebugEnabled() {
-            return false;
-        }
-
-        @Override
-        public void setDebugEnabled(boolean enabled) {
-        }
-
-        @Override
-        public void debug(String msg, Object... args) {
-        }
-
-        @Override
-        public void debug(Throwable thrown) {
-        }
-
-        @Override
-        public void debug(String msg, Throwable thrown) {
-        }
-
-        @Override
-        public Logger getLogger(String name) {
-            return this;
-        }
-
-        @Override
-        public void ignore(Throwable ignored) {
-        }
-    }
-
-}

-/*
- * Copyright 2016 Open Networking Laboratory
- *
- * 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.
- */
-
-package org.onlab.warden;
-
-import static com.google.common.base.Preconditions.checkState;
-
-/**
- * Cell reservation record.
- */
-final class Reservation {
-
-    final String cellName;
-    final String userName;
-    final long time;
-    final int duration;
-    final String cellSpec;
-
-    // Creates a new reservation record
-    Reservation(String cellName, String userName, long time, int duration, String cellSpec) {
-        this.cellName = cellName;
-        this.userName = userName;
-        this.time = time;
-        this.duration = duration;
-        this.cellSpec = cellSpec;
-    }
-
-    /**
-     * Decodes reservation record from the specified line.
-     *
-     * @param line string line
-     */
-    Reservation(String line) {
-        String[] fields = line.trim().split("\t");
-        checkState(fields.length == 5, "Incorrect reservation encoding");
-        this.cellName = fields[0];
-        this.userName = fields[1];
-        this.time = Long.parseLong(fields[2]);
-        this.duration = Integer.parseInt(fields[3]);
-        this.cellSpec = fields[4];
-    }
-
-    /**
-     * Encodes reservation record into a string line.
-     *
-     * @return encoded string
-     */
-    String encode() {
-        return String.format("%s\t%s\t%s\t%s\t%s\n", cellName, userName, time, duration, cellSpec);
-    }
-
-}

-/*
- * Copyright 2016 Open Networking Laboratory
- *
- * 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.
- */
-
-package org.onlab.warden;
-
-import com.google.common.collect.ImmutableSet;
-import com.google.common.collect.Lists;
-import com.google.common.collect.Maps;
-import com.google.common.io.ByteStreams;
-
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.PrintWriter;
-import java.text.SimpleDateFormat;
-import java.util.ArrayList;
-import java.util.Date;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Random;
-import java.util.Set;
-import java.util.Timer;
-import java.util.TimerTask;
-import java.util.concurrent.TimeUnit;
-
-import static com.google.common.base.Preconditions.*;
-
-/**
- * Warden for tracking use of shared test cells.
- */
-class Warden {
-
-    private static final String CELL_NOT_NULL = "Cell name cannot be null";
-    private static final String USER_NOT_NULL = "User name cannot be null";
-    private static final String KEY_NOT_NULL = "User key cannot be null";
-    private static final String UTF_8 = "UTF-8";
-
-    private static final long TIMEOUT = 10; // 10 seconds
-    private static final int MAX_MINUTES = 240; // 4 hours max
-    private static final int MINUTE = 60_000; // 1 minute
-    private static final int DEFAULT_MINUTES = 60;
-
-    private static final String DEFAULT_SPEC = "3+1";
-
-    private final File log = new File("warden.log");
-
-    // Allow overriding these for unit tests.
-    static String cmdPrefix = "";
-    static File root = new File(".");
-
-    private final File cells = new File(root, "cells");
-    private final File supported = new File(cells, "supported");
-    private final File reserved = new File(cells, "reserved");
-
-    private final Random random = new Random();
-
-    /**
-     * Creates a new cell warden.
-     */
-    Warden() {
-        reserved.mkdirs();
-        random.setSeed(System.currentTimeMillis());
-        Timer timer = new Timer("cell-pruner", true);
-        timer.schedule(new Reposessor(), MINUTE / 4, MINUTE / 2);
-    }
-
-    /**
-     * Returns list of names of supported cells.
-     *
-     * @return list of cell names
-     */
-    Set<String> getCells() {
-        String[] list = supported.list();
-        return list != null ? ImmutableSet.copyOf(list) : ImmutableSet.of();
-    }
-
-    /**
-     * Returns list of names of available cells.
-     *
-     * @return list of cell names
-     */
-    Set<String> getAvailableCells() {
-        Set<String> available = new HashSet<>(getCells());
-        available.removeAll(getReservedCells());
-        return ImmutableSet.copyOf(available);
-    }
-
-    /**
-     * Returns list of names of reserved cells.
-     *
-     * @return list of cell names
-     */
-    Set<String> getReservedCells() {
-        String[] list = reserved.list();
-        return list != null ? ImmutableSet.copyOf(list) : ImmutableSet.of();
-    }
-
-    /**
-     * Returns the host name on which the specified cell is hosted.
-     *
-     * @param cellName cell name
-     * @return host name where the cell runs
-     */
-    String getCellHost(String cellName) {
-        return getCellInfo(cellName).hostName;
-    }
-
-    /**
-     * Returns reservation for the specified user.
-     *
-     * @param userName user name
-     * @return cell reservation record or null if user does not have one
-     */
-    Reservation currentUserReservation(String userName) {
-        checkNotNull(userName, USER_NOT_NULL);
-        for (String cellName : getReservedCells()) {
-            Reservation reservation = currentCellReservation(cellName);
-            if (reservation != null && userName.equals(reservation.userName)) {
-                return reservation;
-            }
-        }
-        return null;
-    }
-
-    /**
-     * Returns the name of the user who reserved the given cell.
-     *
-     * @param cellName cell name
-     * @return cell reservation record or null if cell is not reserved
-     */
-    Reservation currentCellReservation(String cellName) {
-        checkNotNull(cellName, CELL_NOT_NULL);
-        File cellFile = new File(reserved, cellName);
-        if (!cellFile.exists()) {
-            return null;
-        }
-        try (InputStream stream = new FileInputStream(cellFile)) {
-            return new Reservation(new String(ByteStreams.toByteArray(stream), "UTF-8"));
-        } catch (IOException e) {
-            throw new IllegalStateException("Unable to get current user for cell " + cellName, e);
-        }
-    }
-
-    /**
-     * Reserves a cell for the specified user and their public access key.
-     *
-     * @param userName user name
-     * @param sshKey   user ssh public key
-     * @param minutes  optional number of minutes for reservation
-     * @param cellSpec optional cell specification string
-     * @return reserved cell definition
-     */
-    synchronized String borrowCell(String userName, String sshKey, int minutes,
-                                   String cellSpec) {
-        checkNotNull(userName, USER_NOT_NULL);
-        checkArgument(userName.matches("[\\w.-]+"), "Invalid user name %s", userName);
-        checkNotNull(sshKey, KEY_NOT_NULL);
-        checkArgument(minutes < MAX_MINUTES, "Number of minutes must be less than %d", MAX_MINUTES);
-        checkArgument(minutes >= 0, "Number of minutes must be non-negative");
-        checkArgument(cellSpec == null || cellSpec.matches("[\\d]+\\+[0-1]"),
-                      "Invalid cell spec string %s", cellSpec);
-        Reservation reservation = currentUserReservation(userName);
-        if (reservation == null) {
-            // If there is no reservation for the user, create one
-            String cellName = findAvailableCell();
-            reservation = new Reservation(cellName, userName, System.currentTimeMillis(),
-                                          minutes == 0 ? DEFAULT_MINUTES : minutes,
-                                          cellSpec == null ? DEFAULT_SPEC : cellSpec);
-        } else if (minutes == 0) {
-            // If minutes are 0, simply return the cell definition
-            return getCellDefinition(reservation.cellName);
-        } else {
-            // If minutes are > 0, update the existing cell reservation
-            reservation = new Reservation(reservation.cellName, userName,
-                                          System.currentTimeMillis(), minutes,
-                                          reservation.cellSpec);
-        }
-
-        reserveCell(reservation);
-        createCell(reservation, sshKey);
-        log(userName, reservation.cellName, reservation.cellSpec,
-            "borrowed for " + reservation.duration + " minutes");
-        return getCellDefinition(reservation.cellName);
-    }
-
-    /**
-     * Returns name of an available cell. Cell is chosen based on the load
-     * of its hosting server; a random one will be chosen from the set of
-     * cells hosted by the least loaded server.
-     *
-     * @return name of an available cell
-     */
-    private String findAvailableCell() {
-        Set<String> cells = getAvailableCells();
-        checkState(!cells.isEmpty(), "No cells are presently available");
-        Map<String, ServerInfo> load = Maps.newHashMap();
-
-        cells.stream().map(this::getCellInfo)
-                .forEach(info -> load.compute(info.hostName, (k, v) -> v == null ?
-                        new ServerInfo(info.hostName) : v.bumpLoad(info)));
-
-        List<ServerInfo> servers = new ArrayList<>(load.values());
-        servers.sort((a, b) -> b.load - a.load);
-        ServerInfo server = servers.get(0);
-        return server.cells.get(random.nextInt(server.cells.size())).cellName;
-    }
-
-    /**
-     * Returns the specified cell for the specified user and their public access key.
-     *
-     * @param userName user name
-     */
-    synchronized void returnCell(String userName) {
-        checkNotNull(userName, USER_NOT_NULL);
-        Reservation reservation = currentUserReservation(userName);
-        checkState(reservation != null, "User %s has no cell reservations", userName);
-
-        unreserveCell(reservation);
-        destroyCell(reservation);
-        log(userName, reservation.cellName, reservation.cellSpec, "returned");
-    }
-
-    /**
-     * Reserves the specified cell for the user the source file and writes the
-     * specified content to the target file.
-     *
-     * @param reservation cell reservation record
-     */
-    private void reserveCell(Reservation reservation) {
-        File cellFile = new File(reserved, reservation.cellName);
-        try (FileOutputStream stream = new FileOutputStream(cellFile)) {
-            stream.write(reservation.encode().getBytes(UTF_8));
-        } catch (IOException e) {
-            throw new IllegalStateException("Unable to reserve cell " + reservation.cellName, e);
-        }
-    }
-
-    /**
-     * Returns the cell definition of the specified cell.
-     *
-     * @param cellName cell name
-     * @return cell definition
-     */
-    private String getCellDefinition(String cellName) {
-        CellInfo cellInfo = getCellInfo(cellName);
-        return exec(String.format("ssh %s warden/bin/cell-def %s",
-                                  cellInfo.hostName, cellInfo.cellName));
-    }
-
-    /**
-     * Cancels the specified reservation.
-     *
-     * @param reservation reservation record
-     */
-    private void unreserveCell(Reservation reservation) {
-        checkState(new File(reserved, reservation.cellName).delete(),
-                   "Unable to return cell %s", reservation.cellName);
-    }
-
-    /**
-     * Creates the cell for the specified user SSH key.
-     *
-     * @param reservation cell reservation
-     * @param sshKey      ssh key
-     */
-    private void createCell(Reservation reservation, String sshKey) {
-        CellInfo cellInfo = getCellInfo(reservation.cellName);
-        String cmd = String.format("ssh %s warden/bin/create-cell %s %s %s %s",
-                                   cellInfo.hostName, cellInfo.cellName,
-                                   cellInfo.ipPrefix, reservation.cellSpec, sshKey);
-        exec(cmd);
-    }
-
-    /**
-     * Destroys the specified cell.
-     *
-     * @param reservation reservation record
-     */
-    private void destroyCell(Reservation reservation) {
-        CellInfo cellInfo = getCellInfo(reservation.cellName);
-        exec(String.format("ssh %s warden/bin/destroy-cell %s %s",
-                           cellInfo.hostName, cellInfo.cellName, reservation.cellSpec));
-    }
-
-    /**
-     * Reads the information about the specified cell.
-     *
-     * @param cellName cell name
-     * @return cell information
-     */
-    private CellInfo getCellInfo(String cellName) {
-        File cellFile = new File(supported, cellName);
-        try (InputStream stream = new FileInputStream(cellFile)) {
-            String[] fields = new String(ByteStreams.toByteArray(stream), UTF_8).split(" ");
-            return new CellInfo(cellName, fields[0], fields[1]);
-        } catch (IOException e) {
-            throw new IllegalStateException("Unable to definition for cell " + cellName, e);
-        }
-    }
-
-    // Executes the specified command.
-    private String exec(String command) {
-        try {
-            Process process = Runtime.getRuntime().exec(cmdPrefix + command);
-            String output = new String(ByteStreams.toByteArray(process.getInputStream()), UTF_8);
-            process.waitFor(TIMEOUT, TimeUnit.SECONDS);
-            return process.exitValue() == 0 ? output : null;
-        } catch (Exception e) {
-            throw new IllegalStateException("Unable to execute " + command);
-        }
-    }
-
-    // Creates an audit log entry.
-    private void log(String userName, String cellName, String cellSpec, String action) {
-        try (FileOutputStream fos = new FileOutputStream(log, true);
-             PrintWriter pw = new PrintWriter(fos)) {
-            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
-            pw.println(String.format("%s\t%s\t%s-%s\t%s", format.format(new Date()),
-                                     userName, cellName, cellSpec, action));
-            pw.flush();
-        } catch (IOException e) {
-            throw new IllegalStateException("Unable to log reservation action", e);
-        }
-    }
-
-    // Carrier of cell information
-    private final class CellInfo {
-        final String cellName;
-        final String hostName;
-        final String ipPrefix;
-
-        private CellInfo(String cellName, String hostName, String ipPrefix) {
-            this.cellName = cellName;
-            this.hostName = hostName;
-            this.ipPrefix = ipPrefix;
-        }
-    }
-
-    // Carrier of cell server information
-    private final class ServerInfo {
-        final String hostName;
-        int load = 0;
-        List<CellInfo> cells = Lists.newArrayList();
-
-        private ServerInfo(String hostName) {
-            this.hostName = hostName;
-        }
-
-        private ServerInfo bumpLoad(CellInfo info) {
-            cells.add(info);
-            load++;     // TODO: bump by cell size later
-            return this;
-        }
-    }
-
-    // Task for re-possessing overdue cells
-    private final class Reposessor extends TimerTask {
-        @Override
-        public void run() {
-            long now = System.currentTimeMillis();
-            for (String cellName : getReservedCells()) {
-                Reservation reservation = currentCellReservation(cellName);
-                if (reservation != null &&
-                        (reservation.time + reservation.duration * MINUTE) < now) {
-                    try {
-                        returnCell(reservation.userName);
-                    } catch (Exception e) {
-                        e.printStackTrace();
-                    }
-                }
-            }
-        }
-    }
-}

-/*
- * Copyright 2016 Open Networking Laboratory
- *
- * 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.
- */
-
-package org.onlab.warden;
-
-import com.google.common.io.ByteStreams;
-import org.eclipse.jetty.server.Response;
-
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import java.io.IOException;
-import java.io.PrintWriter;
-import java.text.SimpleDateFormat;
-import java.util.ArrayList;
-import java.util.Date;
-import java.util.List;
-
-import static com.google.common.base.Strings.isNullOrEmpty;
-
-/**
- * Web socket servlet capable of creating web sockets for the STC monitor.
- */
-public class WardenServlet extends HttpServlet {
-
-    static Warden warden;
-
-    private SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
-
-    @Override
-    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
-            throws ServletException, IOException {
-        resp.setContentType("text/plain; charset=UTF-8");
-        try (PrintWriter out = resp.getWriter()) {
-            if (req.getPathInfo().endsWith("data")) {
-                String userName = req.getParameter("user");
-                if (userName != null) {
-                    printUserInfo(out, userName);
-                } else {
-                    printAvailability(out);
-                }
-            } else {
-                printAvailabilityText(out);
-            }
-        } catch (Exception e) {
-            resp.setStatus(Response.SC_INTERNAL_SERVER_ERROR);
-            e.printStackTrace();
-        }
-    }
-
-    private void printUserInfo(PrintWriter out, String userName) {
-        Reservation reservation = warden.currentUserReservation(userName);
-        out.println(getCellStatus(null, reservation));
-    }
-
-    private void printAvailability(PrintWriter out) {
-        List<String> list = new ArrayList<>(warden.getCells());
-        list.sort(String::compareTo);
-        for (String cellName : list) {
-            Reservation reservation = warden.currentCellReservation(cellName);
-            out.println(getCellStatus(cellName, reservation));
-        }
-    }
-
-    private String getCellStatus(String cellName, Reservation reservation) {
-        if (reservation != null) {
-            long expiration = reservation.time + reservation.duration * 60_000;
-            long remaining = (expiration - System.currentTimeMillis()) / 60_000;
-            return String.format("%s,%s,%s,%s", reservation.cellName,
-                    reservation.cellSpec, reservation.userName, remaining);
-        } else if (cellName != null) {
-            return String.format("%s", cellName);
-        }
-        return null;
-    }
-
-    private void printAvailabilityText(PrintWriter out) {
-        List<String> list = new ArrayList<>(warden.getCells());
-        list.sort(String::compareTo);
-        for (String cellName : list) {
-            Reservation reservation = warden.currentCellReservation(cellName);
-            if (reservation != null) {
-                long expiration = reservation.time + reservation.duration * 60_000;
-                long remaining = (expiration - System.currentTimeMillis()) / 60_000;
-                out.println(String.format("%-14s\t%-10s\t%s\t%s\t%s mins (%s remaining)",
-                                          cellName + "-" + reservation.cellSpec,
-                                          reservation.userName,
-                                          fmt.format(new Date(reservation.time)),
-                                          fmt.format(new Date(expiration)),
-                                          reservation.duration, remaining));
-            } else {
-                out.println(String.format("%-10s\t%-10s", cellName, "available"));
-            }
-        }
-    }
-
-    @Override
-    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
-            throws ServletException, IOException {
-        try (PrintWriter out = resp.getWriter()) {
-            String sshKey = new String(ByteStreams.toByteArray(req.getInputStream()), "UTF-8");
-            String userName = req.getParameter("user");
-            String sd = req.getParameter("duration");
-            String spec = req.getParameter("spec");
-            int duration = isNullOrEmpty(sd) ? 0 : Integer.parseInt(sd);
-            String cellDefinition = warden.borrowCell(userName, sshKey, duration, spec);
-            out.println(cellDefinition);
-        } catch (Exception e) {
-            resp.setStatus(Response.SC_INTERNAL_SERVER_ERROR);
-            e.printStackTrace();
-        }
-    }
-
-    @Override
-    protected void doDelete(HttpServletRequest req, HttpServletResponse resp)
-            throws ServletException, IOException {
-        try (PrintWriter out = resp.getWriter()) {
-            String userName = req.getParameter("user");
-            warden.returnCell(userName);
-        } catch (Exception e) {
-            resp.setStatus(Response.SC_INTERNAL_SERVER_ERROR);
-            e.printStackTrace();
-        }
-    }
-}

-/*
- * Copyright 2016 Open Networking Laboratory
- *
- * 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.
- */
-
-/**
- * Cell warden to coordinate borrowing and returning test cells.
- */
-package org.onlab.warden;
\ No newline at end of file

-/*
- * Copyright 2016 Open Networking Laboratory
- *
- * 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.
- */
-
-package org.onlab.warden;
-
-import com.google.common.io.Files;
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Test;
-import org.onlab.util.Tools;
-
-import java.io.File;
-import java.io.IOException;
-import java.util.Objects;
-
-import static org.junit.Assert.*;
-
-/**
- * Suite of tests for the cell warden.
- */
-public class WardenTest {
-
-    private Warden warden;
-    private File cells;
-    private File supportedCells;
-
-    @Before
-    public void setUp() throws IOException {
-        // Setup warden to be tested
-        Warden.root = Files.createTempDir();
-        Warden.cmdPrefix = "echo ";
-        cells = new File(Warden.root, "cells");
-        supportedCells = new File(cells, "supported");
-        warden = new Warden();
-
-        // Setup test cell information
-        createCell("alpha", "foo");
-        createCell("bravo", "foo");
-        createCell("charlie", "foo");
-        createCell("delta", "bar");
-        createCell("echo", "bar");
-        createCell("foxtrot", "bar");
-
-        new File("warden.log").deleteOnExit();
-    }
-
-    private void createCell(String cellName, String hostName) throws IOException {
-        File cellFile = new File(supportedCells, cellName);
-        Files.createParentDirs(cellFile);
-        Files.write((hostName + " " + cellName).getBytes(), cellFile);
-    }
-
-    @After
-    public void tearDown() throws IOException {
-        Tools.removeDirectory(Warden.root);
-    }
-
-    @Test
-    public void basics() {
-        assertEquals("incorrect number of cells", 6, warden.getCells().size());
-        validateSizes(6, 0);
-
-        String cellDefinition = warden.borrowCell("dude", "the-key", 0, null);
-        assertTrue("incorrect definition", cellDefinition.contains("cell-def"));
-        validateSizes(5, 1);
-
-        Reservation dudeCell = warden.currentUserReservation("dude");
-        validateCellState(dudeCell);
-
-        warden.borrowCell("dolt", "a-key", 0, "4+1");
-        Reservation doltCell = warden.currentUserReservation("dolt");
-        validateCellState(doltCell);
-        validateSizes(4, 2);
-
-        assertFalse("cells should not be on the same host",
-                    Objects.equals(warden.getCellHost(dudeCell.cellName),
-                                   warden.getCellHost(doltCell.cellName)));
-
-        warden.returnCell("dude");
-        validateSizes(5, 1);
-
-        warden.borrowCell("dolt", "a-key", 30, null);
-        validateSizes(5, 1);
-
-        warden.returnCell("dolt");
-        validateSizes(6, 0);
-    }
-
-    private void validateSizes(int available, int reserved) {
-        assertEquals("incorrect number of available cells", available,
-                     warden.getAvailableCells().size());
-        assertEquals("incorrect number of reserved cells", reserved,
-                     warden.getReservedCells().size());
-    }
-
-    private void validateCellState(Reservation reservation) {
-        assertFalse("cell should not be available",
-                    warden.getAvailableCells().contains(reservation.cellName));
-        assertTrue("cell should be reserved",
-                   warden.getReservedCells().contains(reservation.cellName));
-    }
-
-}
\ No newline at end of file

-#! /bin/bash
-# -----------------------------------------------------------------------------
-# init.d script to run ON.Lab test cell warden
-## -----------------------------------------------------------------------------
-### BEGIN INIT INFO
-# Provides:          warden
-# Required-Start:    $network $remote_fs $syslog
-# Required-Stop:     $network $remote_fs $syslog
-# Default-Start:     2 3 4 5
-# Default-Stop:      0 1 6
-# Short-Description: ON.Lab Test Cell Warden
-# Description:       Warden is a broker for sharing test cell infrastructure among ON.Lab developers.
-### END INIT INFO
-
-WARDEN_USER="sdn"
-WARDEN_HOME="/home/$WARDEN_USER/warden"
-WARDEN_VERSION="1.6.0-SNAPSHOT"
-DEBUG="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5005"
-
-cd $WARDEN_HOME
-
-start () {
-    # Start warden if it's not already running
-    if ! status >/dev/null; then
-        echo "Starting Warden"
-        startwarden
-    else
-        echo "Warden is already running"
-    fi
-}
-
-startwarden () {
-    start-stop-daemon --signal INT --start --chuid $WARDEN_USER \
-        --pidfile $WARDEN_HOME/warden.pid --make-pidfile \
-        --background --chdir $WARDEN_HOME \
-        --exec /usr/bin/java -- -jar onlab-warden-$WARDEN_VERSION.jar \
-            &>$WARDEN_HOME/std.log
-}
-
-stop () {
-    if status >/dev/null; then
-        echo "Stopping Warden"
-        start-stop-daemon --signal INT --stop --chuid $WARDEN_USER \
-            --pidfile $WARDEN_HOME/warden.pid
-        rm warden.pid
-    else
-        echo "Warden is not running"
-    fi
-}
-
-restart () {
-    stop
-    start
-}
-
-status () {
-    start-stop-daemon --signal INT --status --chuid $WARDEN_USER \
-        --pidfile $WARDEN_HOME/warden.pid
-}
-
-case $1 in
-    start)
-        start
-    ;;
-    stop | force-stop)
-        stop
-        ;;
-    restart)
-        shift
-        restart "$@"
-        ;;
-    status)
-        status && echo "Warden is running" || echo "Warden is stopped"
-        exit $?
-        ;;
-    *)
-        echo "Usage: $0 {start|stop|restart|status}" >&2
-        exit 1
-        ;;
-esac
-
-exit 0