Adding global flag --strict-start to wildcard-based commands.

This forces job names to be matched from the string start. By default,
some commands will match on any jobs that contain the input name as a
substring, this option forces the match to only happen if the string
starts with the input name. Affects the subcommands: remove, inspect,
rolling-update, undeploy, deploy and stop.

The motivation behind this is production usages returning
"JOB_AMBIGUOUS_REFERENCE" in cases where a job's name is a substring of
another (eg: foo-bar and bar-foo-bar, as the first a substring of the
second).

helios-tools/src/main/java/com/spotify/helios/cli/command/JobInspectCommand.java

@@ -125,7 +125,7 @@ private static String formatRolloutOptions(final RolloutOptions options) {
   }
 
   public JobInspectCommand(final Subparser parser) {
-    super(parser);
+    super(parser, false);
     parser.help("print the configuration of a job");
   }
 

helios-tools/src/main/java/com/spotify/helios/cli/command/JobRemoveCommand.java

@@ -40,7 +40,7 @@ public class JobRemoveCommand extends WildcardJobCommand {
   private final Argument yesArg;
 
   public JobRemoveCommand(Subparser parser) {
-    super(parser);
+    super(parser, false);
 
     parser.help("remove a job");
 

helios-tools/src/main/java/com/spotify/helios/cli/command/JobStartCommand.java

@@ -41,7 +41,7 @@ public class JobStartCommand extends WildcardJobCommand {
   private final Argument tokenArg;
 
   public JobStartCommand(Subparser parser) {
-    super(parser);
+    super(parser, false);
 
     parser.help("start a stopped job");
 

helios-tools/src/main/java/com/spotify/helios/cli/command/JobStopCommand.java

@@ -41,7 +41,7 @@ public class JobStopCommand extends WildcardJobCommand {
   private final Argument tokenArg;
 
   public JobStopCommand(Subparser parser) {
-    super(parser);
+    super(parser, false);
 
     parser.help("stop a running job without undeploying it");
 

helios-tools/src/main/java/com/spotify/helios/cli/command/JobUndeployCommand.java

@@ -46,7 +46,7 @@ public class JobUndeployCommand extends WildcardJobCommand {
   private final Argument yesArg;
 
   public JobUndeployCommand(final Subparser parser) {
-    super(parser);
+    super(parser, false);
 
     parser.help("undeploy a job from hosts");
 

helios-tools/src/main/java/com/spotify/helios/cli/command/WildcardJobCommand.java

@@ -41,6 +41,7 @@
 abstract class WildcardJobCommand extends ControlCommand {
 
   private final Argument jobArg;
+  private final Argument strictStartArg;
 
   public WildcardJobCommand(final Subparser parser) {
     this(parser, false);
@@ -51,16 +52,31 @@ public WildcardJobCommand(final Subparser parser, final boolean shortCircuit) {
 
     jobArg = parser.addArgument("job")
         .help("Job id.");
+    strictStartArg = parser.addArgument("--strict-start")
+        .type(Boolean.class)
+        .setDefault(false)
+        .help("Forces job names to be matched from the string start. "
+              + "By default, some commands will match on any jobs that contain the input name as a"
+              + " substring, this option forces the match to only happen if the string starts with"
+              + " the input name. Affects the subcommands: remove, inspect, rolling-update,"
+              + " undeploy, deploy and stop.");
   }
 
   @Override
   int run(final Namespace options, final HeliosClient client, final PrintStream out,
           final boolean json, final BufferedReader stdin)
       throws ExecutionException, InterruptedException, IOException {
-
     final String jobIdString = options.getString(jobArg.getDest());
     final Map<JobId, Job> jobs = client.jobs(jobIdString).get();
 
+    if (options.getBoolean(strictStartArg.getDest())) {
+      for (final Map.Entry<JobId, Job> entry : jobs.entrySet()) {
+        if (!entry.getKey().toShortString().startsWith(jobIdString)) {
+          jobs.remove(entry.getKey());
+        }
+      }
+    }
+
     if (jobs.size() == 0) {
       if (!json) {
         out.printf("Unknown job: %s%n", jobIdString);

helios-tools/src/test/java/com/spotify/helios/cli/command/RollingUpdateCommandTest.java

@@ -24,6 +24,7 @@
 import static com.spotify.helios.common.descriptors.DeploymentGroup.RollingUpdateReason.MANUAL;
 import static org.hamcrest.CoreMatchers.containsString;
 import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.CoreMatchers.not;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.junit.Assert.assertEquals;
 import static org.mockito.Matchers.any;
@@ -648,6 +649,37 @@ public void testTimeoutDuringRolloutOutput() throws Exception {
     assertThat(baos.toString(), containsString(expectedSubstring));
   }
 
+  @Test
+  public void testStrictStartJobName() throws Exception {
+    final JobId jobId1 = JobId.parse("foo-bar:cafe");
+    Job job1 = Job.newBuilder()
+        .setName(jobId1.getName())
+        .setHash(jobId1.getHash())
+        .setRolloutOptions(jobOptions)
+        .build();
+    final JobId jobId2 = JobId.parse("bar:beef");
+    Job job2 = Job.newBuilder()
+        .setName(jobId2.getName())
+        .setHash(jobId2.getHash())
+        .setRolloutOptions(jobOptions)
+        .build();
+    final Map<JobId, Job> jobs = ImmutableMap.of(
+        jobId1, job1,
+        jobId2, job2
+    );
+    when(client.jobs(anyString())).thenReturn(immediateFuture(jobs));
+
+    when(options.getBoolean("strict-start")).thenReturn(true);
+
+    when(options.getString("job")).thenReturn("bar");
+
+    final int ret = command.run(options, client, out, false, null);
+
+    assertEquals(ret, 0);
+
+    assertThat(out.toString(), not(containsString("Ambiguous job reference")));
+  }
+
   private static class TimeUtil implements RollingUpdateCommand.SleepFunction, Supplier<Long> {
 
     private long curentTimeMillis = 0;