[FIXED JENKINS-15806] - Fail build on failed pull

This is an update to pull request #31 and #40

src/main/java/hudson/plugins/mercurial/MercurialSCM.java

@@ -380,7 +380,7 @@ PollingResult compare(Launcher launcher, TaskListener listener, MercurialTagActi
         return result;
     }
 
-    private void pull(Launcher launcher, FilePath repository, TaskListener listener, Node node, String revision, StandardUsernameCredentials credentials) throws IOException, InterruptedException {
+    private int pull(Launcher launcher, FilePath repository, TaskListener listener, Node node, String revision, StandardUsernameCredentials credentials) throws IOException, InterruptedException {
         HgExe hg = new HgExe(findInstallation(getInstallation()), credentials, launcher, node, listener, /* TODO */new EnvVars());
         try {
         ArgumentListBuilder cmd = hg.seed(true);
@@ -392,7 +392,7 @@ private void pull(Launcher launcher, FilePath repository, TaskListener listener,
         if (cachedSource != null) {
             cmd.add(cachedSource.getRepoLocation());
         }
-        HgExe.joinWithPossibleTimeout(
+        return HgExe.joinWithPossibleTimeout(
                 hg.launch(cmd).pwd(repository),
                 true, listener);
         } finally {
@@ -593,8 +593,9 @@ private void update(AbstractBuild<?, ?> build, Launcher launcher, FilePath repos
         HgExe hg = new HgExe(findInstallation(getInstallation()), credentials, launcher, build.getBuiltOn(), listener, build.getEnvironment(listener));
         try {
         Node node = Computer.currentComputer().getNode(); // TODO why not build.getBuiltOn()?
+        int pullExitCode;
         try {
-            pull(launcher, repository, listener, node, toRevision, credentials);
+            pullExitCode = pull(launcher, repository, listener, node, toRevision, credentials);
         } catch (IOException e) {
             if (causedByMissingHg(e)) {
                 listener.error("Failed to pull because hg could not be found;" +
@@ -604,6 +605,10 @@ private void update(AbstractBuild<?, ?> build, Launcher launcher, FilePath repos
             }
             throw new AbortException("Failed to pull");
         }
+        if (pullExitCode != 0) {
+            listener.error("Failed to pull");
+            throw new AbortException("Failed to pull");
+        }
 
         int updateExitCode;
         try {

src/test/java/hudson/plugins/mercurial/SCMTestBase.java

@@ -718,6 +718,34 @@ public Proc onLaunch(Launcher.ProcStarter p) throws IOException {
         }
     }
 
+    @Bug(15806)
+    @Test public void testPullReturnCode() throws Exception {
+        File repoOnline = tmp.newFolder();
+        File repoOffline = new File(repoOnline.getPath() + "-offline");
+
+        m.hg(repoOnline, "init");
+        m.touchAndCommit(repoOnline, "init");
+        m.hg(repoOnline, "tag", "init");
+
+        FreeStyleProject p = j.createFreeStyleProject();
+        MercurialSCM a = new MercurialSCM(hgInstallation(), repoOnline.getPath(), null, null, null, null, false);
+        p.setScm(a);
+
+        // First build to get a local checkout (no update on this one)
+        AbstractBuild<?, ?> b = p.scheduleBuild2(0).get();
+        assertEquals(Result.SUCCESS, b.getResult());
+
+        // Second build fails due to offline repo
+        repoOnline.renameTo(repoOffline);
+        b = p.scheduleBuild2(0).get();
+        assertNotEquals(Result.SUCCESS, b.getResult());
+
+        // Third build succeeds after repo returns
+        repoOffline.renameTo(repoOnline);
+        b = p.scheduleBuild2(0).get();
+        assertEquals(Result.SUCCESS, b.getResult());
+    }
+
     /* TODO the following will pass, but canUpdate is not going to work without further changes:
     public void testParameterizedBuildsSource() throws Exception {
         p = createFreeStyleProject();